Invasion History

First Non-native North American Tidal Record: 1997
First Non-native West Coast Tidal Record: 1997
First Non-native East/Gulf Coast Tidal Record: 2021

General Invasion History:

Potamopyrgus antipodarum is native to fresh and brackish waters of the North and South Islands of New Zealand. In the 18th and 19th centuries, it was introduced to Australia (first reported 1870) and Europe (England- 1859) and spread rapidly in both continents (Winterbourn 1970; Ponder 1988). Possible vectors include dry ballast and the drinking water casks of sailing ships. In Europe, its range runs from the British Isles and Spain, east through the Baltic and Black Seas in interior fresh and coastal brackish waters (Nikolaev 1951; Ponder 1988; Leppakoski and Olenin 2000; Gomiou et al. 2002; Radea et al. 2008). Along the marine coasts of Europe, it prefers the fresher portions of estuaries but does tolerate salinities above 18 PSU (Gerard et al. 2003). This snail has also been introduced to Iraq (Naser and Son 2009) and Japan (Shimada and Urabe 2003).

The New Zealand Mud Snail has been transported by a wide range of vectors. While ships' drinking water barrels were a likely historical vector for introduction to Europe (Ponder 1988), subsequent dispersal modes probably included hull fouling on boats and ships, transport through canals, dry ballast, ballast water, transport on fishing gear, and with stocked fishes or ornamental aquatic plants (Eno et al. 1997; New Zealand Mudsnail Management and Control Plan Working Group 2007; Davidson et al. 2008). Natural dispersal on birds' feet and within guts is also likely (van Leeuwen 2012). The snail's small size, salinity tolerance, and parthenogenetic reproduction have enabled widespread transport (Alonso and Castro-Díez 2012). Multiple parthenogenetic clones exist in New Zealand and Australia, and many have been introduced. At least four clones have been introduced to North America, three probably directly from New Zealand. In the Great Lakes at least one clone arrived via Europe (Dybdahl and Drown 2011).

North American Invasion History:

Invasion History on the West Coast:

In 1987, Potamopyrgus antipodarum was first collected in North America in the headwaters of the Snake River, Idaho and subsequently spread to the headwaters of the Missouri River in Montana. At least three clones exist in Western North America, a widespread form (US 1) derived from New Zealand, and two with restricted ranges in the Snake River (US 1a and US3; Dybdahl and Drown 2011; Hershler et al. 2012). Its spread to other parts of North America has been rapid, but spotty, on boats, fishing gear, boots and waders, with stocked fish, etc. It was collected in the Columbia River estuary near Astoria in 1996 by James Carlton (personal communication, Davidson et al. 2008) and has subsequently spread into fresh and brackish waters up and down the West Coast, including the Rogue River, Oregon (OR) in 1999; Coos Bay, OR in 2005; Alsea Bay, OR in 2007; Yaquina Bay, OR in 2008; Tillamook Bay, OR in 2007; Long Beach, Washington (WA) in 2002; Willapa Bay tributaries, WA (Davidson et al. 2008); and Grays Harbor, WA (USGS Nonindigenous Aquatic Species Program 2013). In 2007, it was collected in Port Alberni Inlet, on the west side of Vancouver Island, British Columbia, at a salinity of 5 PSU (Davidson et al. 2008). By 2009, a population became established in Capitol Lake, Olympia, WA, an artificial lake created by damming an inlet of Puget Sound. An attempt was made to control the population by letting seawater flow into the lake at high tides, raising the salinity to 7.5-27 PSU. The backflush treatment greatly reduced P. antipodarum populations, but survivors showed increased salinity tolerances (Leclair and Cheng 2011).

In California, P. antipodarum was first collected in the Sacramento-San Joaquin Delta in 2003, on the Mokelumne River (USGS Nonindigenous Aquatic Species Program 2008). It has subsequently been collected in at least four other San Francisco Bay tributaries: Calaveras River (in 2004), Napa River, West Antioch Creek, and Alameda Creek (in 2008, USGS Nonindigenous Aquatic Species Program 2008). The New Zealand Mud Snail was also collected in other coastal watersheds from Ventura County to Santa Cruz (in 2008, USGS Nonindigenous Aquatic Species Program 2013).

Potamopyrgus antipodarum spread in a spotty fashion in the Intermountain West of North America, from the Snake River, Idaho in 1997, appearing in the Madison River, Montana-Wyoming in 1994-1995, and in the Green-Colorado system and the Great Salt Lake basin in Utah in 2001. It was found in the Colorado River in Arizona in 1996, and in southeastern California, in the Owens River Valley. In 2004-2005, populations were found in the South Platte River drainage, east of the Rockies in Colorado (USGS Nonindigenous Aquatic Species Program 2013; New Zealand Mudsnail Management and Control Plan Working Group 2007). This pattern of widely scattered dispersal suggests a diverse mixture of anthropogenic vectors, and possibly natural transport by birds, as well.

Invasion History on the East Coast:

In 1991, Potamopyrgus antipodarum was found at Wilson, New York on Lake Ontario (Zaranko et al. 1997). It spread in the Great Lakes - St. Lawrence system to Prescott, Ontario on the St. Lawrence River in 2004 (USGS Nonindigenous Aquatic Species Program 2013); Lake Erie in 2005; Thunder Bay, Ontario in 2005; the St. Louis River estuary, Minnesota in 2005; and Lake Michigan in 2006 (Trebitz et al. 2010; USGS Nonindigenous Aquatic Species Program 2013). The Great Lakes population belongs to a clone (US2) which has a mitochondrial DNA profile identical to the clone (EU A), which is widespread in Europe (Dybdahl and Drown 2011). This snail was probably transported to the Great Lakes in ballast water of transatlantic ships (Zaranko et al. 1997).

In 2013, it was found to be abundant in Spring Creek, in the Bald Eagle Creek (upper Susquehanna) watershed in central Pennsylvania (USGS Nonindigenous Aquatic Species Program 2013). This is its first occurrence in an Atlantic drainage outside the Great Lakes - St. Lawrence system. In September, 2017, P. antipodarum was found closer to Chesapeake Bay, in the Big Gunpowder River, about 50 km from tidal waters (Dance 2017). GARP modeling (Genetic Algorithm for Rule-set Production) predicts that this snail could colonize coastal drainages from Chesapeake Bay to Nova Scotia, and the Mississippi Basin to the edge of the Great Plains (Loo et al. 2007).

Invasion History Elsewhere in the World:

Potamopyrgus antipodarum is likely introduced in Australia. It belongs to a genus that has several species in New Zealand, but has no fossil record and is the only Potamopyrgus species in Australia. It was first reported in Hobart, on the south coast of Tasmania, in 1872 (as Paludestrina wisemaniana and Bythinella legrandiana) and was subsequently found in Launcestown, Tasmania in 1879; and Melbourne, Victoria in 1895. It was first collected in Adelaide, South Australia in 1926 and near Sydney, New South Wales in 1963 (Ponder 1988). It is now widespread in coastal drainages of Victoria and also in streams around Adelaide and Sydney. It is predicted to be capable of colonizing most of the southeastern and some of the southwestern (Perth area) coastal region of Australia (Loo et al. 2007).

Potamopyrgus antipodarum was collected in Europe before it was found in Tasmania. It was found in the Thames estuary as early as 1859, and was formally named as Hydrobia jenkinsi Smith in 1889. It spread slowly in coastal areas at first and then rapidly along canals and coastal rivers. It was widespread by 1920 and now occurs from the Scilly Islands in the south, to the Shetland Islands in the north, although in Scotland it is largely confined to coastal areas (Ponder 1988; Eno et al. 1997). By 1887, this snail was collected in Germany in the Western Baltic Sea (Olenin and Leppakoski 2000), and within two decades was found in Copenhagen and the Oder-Odra lagoon (Gruszka 1999; Jensen and Knudsen 2005). The New Zealand Mudsnail spread further into the Baltic, reaching the mid-Baltic (Gotland, Sweden; Curonian Lagoon, Lithuania) by 1920, the Gulf of Finland by 1926, and the Gulf of Bothnia by 1945 (Nikolaev 1951; Leppakoski and Olenin 2000). It reached southern Norway by 1952 (Hopkins 2002), and was introduced to Galicia, Spain in the late 19th century, and Catalonia, on the Mediterranean by 1936 (Altimira 1969, cited by Múrria et al. 2008). Potamopyrgus antipodarum reached the Black Sea in Romania by 1952 (Gomoiu et al. 2002) and reached the region around Odessa, Ukraine by 2005 (Son 2008). The New Zealand Mud Snail has colonized the interior of Europe as well as the coast, reaching such landlocked countries as Switzerland and Austria (Alonso and Castro-Diez 2012).

Potamopyrgus antipodarum has had two widely separated introductions in Asia, in Japan and Iraq. It was first found in Japan, in Mie prefecture, Honshu in 1990, and is now found on all of Japan's main islands (National Institute for Environmental Studies 2013). In 2008, this snail was found in the Garmat Ali River, Basra, Iraq, part of Shat-al-Arab estuary (Naser and Son 2009). The authors consider bird dispersal to be the likeliest vector, but given the military and oil industry activity in the region, shipping cannot be ruled out.


Description

Potamopyrgus antipodarum is a small snail, primarily occurring in freshwater, but able to tolerate brackish to near-marine salinities in estuaries (Leclair and Cheng 2011; Hoy et al. 2012). Its overall body shape is conical-oval, with a sharp spire. Its shell is solid, but not thick-walled, and is dextrally coiled, usually with 5-6 and sometimes 7-8 whorls. The aperture is oval, and the inner lip extends completely along the parietal wall. The first whorl is minute and raised, and the subsequent whorls are evenly rounded and separated by a deep suture. The body whorl is bluntly angular. The umbilicus is a narrow slit. The operculum is oval, with the nucleus off-center and a calcium deposit on the inner surface. Specimens in New Zealand may reach 13 mm in shell length, with 7-8 whorls, but a more typical size in introduced populations is 4-6 mm with 5-6 whorls. The color of the shell ranges from light to dark brown. Description from: Winterbourn 1970, Zaranko et al. 1997, New Zealand Mudsnail Management and Control Plan Working Group 2007, and Loo 2012.

All introduced populations are clonal, reproducing parthenogenetically. Individuals can vary considerably in shape, size, color, and shell ornamentation, even within one population, as well as among clones. Some individuals and clones show a sharp, bristly keel on the whorls (Winterbourn 1970; Ponder 1988; New Zealand Mudsnail Management and Control Working Group 2007; Butkus et al. 2012; Loo 2012). At least four clones are known from North America, three from Western North America, and one in the Great Lakes. The clone found in the Great Lakes is also widespread in Europe (Dybdahl and Drown 2011). Multiple lineages havebeeen involved in invasions in Europe. A largely freshwater Lineage T is widespread in Central Europe, but a more salinity tolerant Lineage Z is establoished around the Black Sea, while both lineages occur in Baltic, though usually in different habitats (Butkus et al. 2020).


Taxonomy

Taxonomic Tree

Kingdom:   Animalia
Phylum:   Mollusca
Class:   Gastropoda
Order:   Neotaenioglossa
Species:   antipodarum

Synonyms

Amnicola antipodarum (J. E. Gray, 1843)
Amnicola zelandiae (J. E. Gray, 1843)
Bithinia tasmanica (Woods, 1876)
Bythinella pattisoni (Cotton, 1942)
Hydrobia jenkinsi (E. A. Smith, 1889)
Paludestrina jenkinsi (E. A. Smith, 1889)

Potentially Misidentified Species

Assiminea californica
West Coast native about 3 mm in size, with a more blunt spire. Found in salt and brackish marshes.

Assiminea parasitologia
Northwest Pacific native, introduced to brackish marshes in Oregon bays.  About 5-6 mm in size, with a blunt spire.

Assiminea succinea
East coast native, about 3 mm in size. Found in salt and brackish marshes.

Bithynia tentaculata
Freshwater snail, native to Europe, introduced to Great Lakes and East coast rivers. About 12 mm in size, has a more oval shape and a less prominent spire.

Littoridinops monroensis
East coast native, introduced to brackish waters in San Francisco Bay. Up to 5.5 mm in size, shell is more elongate.

Ecology

General:

Potamopyrgus antipodarum is a euryhaline freshwater snail, capable of surviving near-marine salinities (Gerard et al. 2003; Leclair and Cheng 2011; Hoy et al. 2012). In its native New Zealand, this snail has both sexually reproducing and clonal populations. Introduced populations are triploid parthenogenetic, consisting of females reproducing without fertilization, though they occasionally produce males (Ponder 1988; New Zealand Mudsnail Management and Control Plan Working Group 2007; Loo 2012; Liu et al. 2012). Some European populations have up to 20% males, although the usual range is 0 to 5%. Males do not seem to contribute to population growth or invasion success (Neiman et al. 2012). The snails are oviviparous, brooding eggs, and producing an average of 50 live young per brood and an average of 230 young per year. Females reach breeding size at about 3.5 mm and 3-6 months of age, and their life cycle is annual (Winterbourn 1970; Lassen 1979; Crosier et al. 2006). Although invading populations are parthenogenetic, there seems to be sufficient genetic diversity for adaptation to a wide range of habitats and environmental conditions. The concept of a small number of clones, as defined by mitochondrial DNA (Dybdahl and Drown 2011) may underestimate the genetic diversity of the introduced populations (Liu et al. 2012; Hershler et al. 2012).

Potamopyrgus antipodarum inhabits a wide range of freshwater and brackish habitats, including streams, springs, ponds, lakes and estuaries. It is often more abundant in disturbed areas, such as pastures, compared to forests, due to thicker algal growth, with more light and nutrients (Ponder 1988; Loo et al. 2007). In Australia, it has been found in drinking water tanks and pipes (Ponder 1988). It tolerates temperatures as low as 2°C, but cannot withstand freezing (Moffit and James 2012). The New Zealand Mud Snail is also tolerant of varying salinities and can be very abundant in estuarine habitats (Lassen 1979; Gerard et al. 2003; Ezhova et al. 2005; Davidson et al. 2010; Brenneis et al. 2010). Published accounts, using snails from New Zealand, Europe, and the western US give widely varying upper salinity limits for this animal, from 21 to 64 PSU. This may reflect differences in method and acclimation in the wild and laboratory, as well as clonal differences between populations (Leclair and Cheng 2011). Hoy et al. (2012) compared salinity tolerances of a population from the mouth of the Columbia River, where salinities fluctuated between 0 and 32 PSU, with those from freshwater, coastal Devils Lake (Oregon). With gradual acclimation, the Devils Lake population had the same 50% tolerance limit as the Columbia River population – 34 PSU. European estuarine populations occur in salinities at least up to 26 PSU (Gerard et al. 2003). The New Zealand Mud Snail is not normally amphibious, but does occur on exposed water-saturated mud and can survive up to 10 days on a saturated surface. On a dry surface, it can survive 30-50 hours in 'dry' air (Winterbourn 1970) and 68% relative humidity (Alonso and Castor-Diez 2012), respectively. Thus, this snail has a strong potential for transport on fishing gear, boots, boats, and many other vectors.

The food of P. antipodarum consists of detritus, periphyton (attached algae), and benthic diatoms (Brenneis et al. 2010; Loo 2012). The snail is a potential prey for fish and invertebrates, including the Signal Crayfish (Pacifastacus leniusculus) (Brenneis et al. 2010). However, it is poorly digested by most fishes and birds (New Zealand Mudsnail Management and Control Plan Working Group 2007; Bersine et al. 2008; Vinson and Baker 2008; van Leeuwen et al. 2012). New Zealand Mudsnails are hosts to numerous parasites in their native region (14 trematode spp., Winterbourn 1970; Krist and Lively 1998), but very few (0-2) in invaded waters (France, Gerard et al. 2003; Ontario Creek, Karatyev et al. 2012; Wyoming, Adema et al. 2009). Release from parasites and predators is probably one of many factors contributing to this species invasion success (Gerard et al. 2003; Alonso et al. 2012).

Food:

Algae, detritus

Consumers:

Fishes, birds

Competitors:

Trophic Status:

Deposit Feeder

DepFed

Habitats

General HabitatNontidal FreshwaterNone
General HabitatFresh (nontidal) MarshNone
General HabitatTidal Fresh MarshNone
General HabitatUnstructured BottomNone
General HabitatSalt-brackish marshNone
Salinity RangeLimnetic0-0.5 PSU
Salinity RangeOligohaline0.5-5 PSU
Salinity RangeMesohaline5-18 PSU
Salinity RangePolyhaline18-30 PSU
Tidal RangeSubtidalNone
Tidal RangeLow IntertidalNone
Vertical HabitatEpibenthicNone


Tolerances and Life History Parameters

Minimum Temperature (ºC)2Little mortality at 2-4 C, but 100% mortality at 0 C (Moffit and James 2012)
Maximum Temperature (ºC)31Experimental, Cox and Rutherford 2000.
Minimum Salinity (‰)0This is a freshwater species.
Maximum Salinity (‰)32Experimental, 9 day LC 50, Hoy et al. 2012, snails from mouth of Columbia River. (72 h LC50, 28 PSU (Piscart et al. 2011), short term survival at 32 PSU (Lucas 1965, cited by Gerard et al. 2003). Reported field upper salinities range from 22-28, while laboratory tolerances range for 15 -64 PSU. Salinity tolerance may vary among genetic strains, and with acclimation (LeClair and Cheng 2011; Hoy et al. 2012).
Minimum Reproductive Salinity0This is a freshwater species.
Maximum Reproductive Salinity15Experimental, Danish (Jacobsen and Forbes 1997) and Columbia River, and New Zealand clones, as well as New Zealand sexual populations (Drown et al. 2011) showed similar patterns with a peak in reproductive output at 5-10 PSU, and a sharp reduction in reproduction at 15 PSU. Orlova and Kommendatov (2013), using populations from the Gulf of Finland, and different modes of acclimation, found that reproduction decreased at 10 PSU, and ceased at 18 PSU.
Minimum Length (mm)3.5Parthenogenetic females begin laying eggs at 3-4 mm (Loo 2011; Zarenko et al.1997)
Maximum Length (mm)12Specimens in New Zealand may reach 13 mm in shell length, with 7-8 whorls, but a more typical size in introduced populations is 4-6 mm, with 5-6 whorls (Zaranko et al. 1997; Loo 2011)
Broad Temperature RangeNoneCold temperate-Warm temperate
Broad Salinity RangeNoneNontidal Limnetic-Polyhaline

General Impacts

The rapid spread and high densities (up to 500,000-800,000 m-3) achieved by Potamopyrgus antipodarum in its non-native range have prompted concern about competition with native invertebrates, and adverse effects on freshwater and estuarine food webs, including sport and commercial fishes.

Specific economic impacts of the New Zealand Mud Snail have not been reported in North America. However, it is suspected to have a negative impact on fisheries, because it seems to be poorly digested, and under-consumed relative to its abundance, by many fish species. It is generally regarded as a competitor with native snails and a threat to biodiversity, especially of isolated streams and springs (New Zealand Mudsnail Management and Control Plan Working Group 2007; Bersine et al. 2008; Vinson and Baker 2008; Brenneis et al. 2011). These concerns have prompted research on control and eradication methods, and prompted education programs for fishermen and boaters (Richards et al. 2012; New Zealand Mudsnail Management and Control Plan Working Group 2007; Leclair and Cheng 2011; Alonso and Castro-Díez 2012). In Australia, this species has been known to foul water tanks and clog drinking water pipes (Ponder 1988).

Ecological Impacts

Competition with native snails and other invertebrates, habitat impacts, and food web and nutrient impacts have been reported in freshwater systems, but the nature and magnitude of these impacts have varied greatly (Kerans et al. 2005; Múrria et al. 2008; Alonso and Castro-Diez 2012; Loo 2012; Moore et al. 2012). In estuaries, in France and Denmark, and in portions if the Baltic Sea, very high densities and numerical dominance of benthic communities have been observed, leading to inferences of competition, habitat changes, and alteration of food webs and nutrient cycles (Lassen 1979; Gerard et al. 2003; Thomsen et al. 2009; Zaiko et al. 2011). However, the only experimental evaluations of impacts of P. antipodarum in estuaries have been conducted in the Columbia River estuary (Brenneis et al. 2010; Brenneis et al. 2011). The results of these experiments, so far, suggest that impacts on native food webs are subtle, and do not represent drastic alterations.

Competition: Competition of P. antipodarum with other invertebrates, especially snails, has often been inferred from the very high densities and numerical dominance that this species achieves in estuaries. Lassen (1979) noted its high reproductive output relative to other hydrobiids, while Gerard et al. (2003) noted the near-absence of trematode parasites in this snail. Zaiko et al. (2011) listed this species as having some or moderate 'community impacts', (presumed to be competition with native invertebrates) in 5 of 8 regions of the Baltic Sea, based largely on dominance or historical increases in abundance (e.g. Ezhova et al. 2005). Experimental and field observations in Wyoming, Idaho, and Montana springs and streams provide some evidence for competition with native snails, summarized by Alonso and Castro-Diez (2012). In field experiments, tiles with high densities of New Zealand Mudsnails had reduced settlement of native invertebrates (insects and mollusks, Kerans et al. 2005). In the Owens River, California, a population boom of P. antipodarum was accompanied by a crash of native grazers, which recovered when the snail abundance sharply declined, strongly indicative of competition (Moore et al. 2012). However, in the Columbia River estuary, a competition experiment using P. antipodarum and the native isopod Gnorimosphaeroma insulare found that snail density had no effect on isopod feeding, but isopod density reduced snail feeding (Brenneis et al. 2011).

Habitat Change: Potamopyrgus antipodarum has the potential to alter habitats by reducing algal cover. However, grazing rates have not been measured in estuaries, and observations on changes in algal cover in streams are contradictory (Hall et al. 2003; Riley et al. 2008; Alonso and Castro-Diez 2012). At high snail densities, heavy deposition of shells could have an effect on sediment quality (Schmidlin et al. 2010, cited by Alonso and Castro-Diez 2012). Habitat impacts were suggested for P. antipodarum in the Vistula Lagoon, Baltic Sea (Ezhova et al. 2005; Zaiko et al. 2011).

Food/Prey: Potamopyrgus antipodarum is a potential prey for fishes, birds, and invertebrates, including the Signal Crayfish (Pacifastacus leniusculus) (Brenneis et al. 2011). However, it is poorly digested by most fishes and birds (New Zealand Mudsnail Management and Control Plan Working Group 2007; Bersine et al. 2008; Vinson and Baker 2008). Vinson and Baker (2008) found that Rainbow Trout (Oncorhynchus mykiss) grew poorly on an exclusive diet of P. antipodarum. Rainbow and Brown Trout (Salmo trutta) from the Green River, Utah, with New Zealand Mud Snails in their gut contents, had poorer body condition (Vinson and Baker 2008). Field evidence form the Columbia River estuary suggested that many species of estuarine fishes avoided the snails as prey (Bersine et al. 2008). One exception is the Tidewater Goby (Eucyclogobius newberryi), an endangered species of the California coast, for which this snail has become an important food source (Hellmair et al. 2011).

Trophic Cascade: High population densities of P. antipodarum have the potential to alter food webs and nutrient cycles in aquatic ecosystems. In some inland streams (MT, ID, WY), grazing by P. antipodarum has resulted in consumption of much of the primary production and releases of large quantities of ammonium, stimulating plant and microbial growth (Hall et al. 2003; Alonso and Castro-Diez 2012). In one WY stream, heavy grazing of filamentous green algae, led to its replacement by nitrogen-fixing diatoms, increasing the nitrogen budget in the stream (Arango et al, 2009). These changes in nutrient cycles have been suggested to occur in estuaries in the Baltic (Thomsen et al. 2009; Zaiko et al. 2011). A smaller-scale food web change was seen in experiments with Columbia River estuary species, when high abundances of P. antipodarum led to increased consumption by native fishes and a shift away from the native isopod Gnorimosphaeroma insulare to the native amphipod Americorophium salmomis. This change in diet may have resulted from a change in foraging behavior in the fishes in the presence of the snails (Brenneis et al. 2011).

Regional Impacts

B-IXNoneEcological ImpactCompetition
Some community impacts (Zaiko et al. 2011)
B-VIINoneEcological ImpactCompetition
Some community impacts, central Baltic, Vistula Lagoon (Zaiko et al. 2011). In the Vistula Lagoon, P. antipodarum has become extremely abundant in recent years (Ezhova et al. 2005).
B-IIINoneEcological ImpactTrophic Cascade
Moderate ecosystem impacts (Thomsen et al. 2009, Zaiko et al. 2011). This assessment is based on abundance in estuaries and reported impacts (grazing and nutrient release, foodweb changes) in freshwater systems (Thomsen et al. 2009).
B-XINoneEcological ImpactCompetition
Some community impacts (Zaiko et al. 2011)
B-XIINoneEcological ImpactCompetition
Some community impacts (Zaiko et al. 2011)
B-XIIINoneEcological ImpactCompetition
Some community impacts (Zaiko et al. 2011)
B-VIINoneEcological ImpactHabitat Change
Some habitat impacts, unspecified, Vistula Lagoon (Ezhova et al. 2005; Zaiko et al. 2011)
B-VIINoneEcological ImpactTrophic Cascade
Moderate ecosystem impacts, Vistula Lagoon, on productivity and nutrient cycles (Ezhiva et al. 2005; Zaiko et al. 2011)
B-IVNoneEcological ImpactCompetition
moderate competitive impacts, Odra Lagoon (Zaiko et al. 2011)
P135_CDA_P135 (Mad-Redwood)Ecological ImpactFood/Prey
Potamopyrgus antipodarum has become a frequent food item for the Tidewater Goby (Eucyclogobius newberryi), an endangered fish of California coastal streams and lagoons (Hellmair et al. 2011).
P260Columbia RiverEcological ImpactTrophic Cascade
In aquarium experiments with assemblages of Columbia River estuary species, high abundances of P. antipodarum led to increased consumption by fishes (Staghorn Sculpin- Leptocottus armatus; Threespine Stickleback- Gasterosteus aculeatus; Juvenile Starry Flounder Platicthys stellatus), and a shift away from the native isopod Gnorimosphaeroma insulare to the native amphipod Americorophium salmomis. This change in diet may have resulted from a change in foraging behavior in the fishes, in the presence of the snails (Brenneis et al. 2011).
P260Columbia RiverEcological ImpactFood/Prey
Field surveys indicate that the dominant species of fishes in the Columbia River estuary (Staghorn Sculpin- Leptocottus armatus; Threespine Stickleback- Gasterosteus aculeatus; Juvenile Starry Flounder- Platicthys stellatus; Shiner Perch- Cymatogaster aggregata) rarely fed on P. antipodarum, despite the snail's high abundance in the benthos. However, field stomach contents and experimental observations indicate that the abundance of the snails had little effect on energy consumption by the fishes (Brenneis et al. 2011).
NEA-IVNoneEcological ImpactCompetition
Potamopyrgus antipodarum was the dominant gastropod in a community of freshwater snails in olgiohaline enclosed marshes, and was the only species in mesohaline marshes. This was attributed to parthenogenesis, high reproductive output, and scarcity of trematode parasites (Gerard et al. 2003).
B-IIINoneEcological ImpactCompetition
Potamopyrgus antipodarum had a higher reproductive output than 2 native sexually reproducing hydrobiids Hydrobia ventrosa and H. ulvae, although less than another sexually reproducing species, H. neglecta, which was considered a 'fugitive species', mostly found in disturbed environments (Lassen 1979).
B-VIIINoneEcological ImpactFood/Prey
Potoamopyrgus antipodarum (New Zealand Mud Snail) is less preferred than the native Bithynia antipodarum (Faucet Snail) for Tench (Tinca tinca), a common fish in the Baltic Sea in Lithuania. The New Zealedn Mud Snail has a similar shelll-strength, but less soft-tissue than the Faucet Snail (Butkus and Višinskien? 2020)..

Regional Distribution Map

Bioregion Region Name Year Invasion Status Population Status
GL-III Lake Ontario 1991 Def Estab
B-III None 1887 Def Estab
B-V None 1900 Def Estab
B-VI None 1920 Def Estab
B-VII None 1920 Def Estab
B-X None 1926 Def Estab
B-VIII None 1927 Def Estab
B-XIII None 1945 Def Estab
B-XII None 1945 Def Estab
B-XI None 0 Def Estab
B-IX None 1936 Def Estab
P260 Columbia River 1997 Def Estab
P170 Coos Bay 2006 Def Estab
P090 San Francisco Bay 2004 Def Estab
GL-I Lakes Huron, Superior and Michigan 2001 Def Estab
P150 Rogue River 2002 Def Estab
P180 Umpqua River 2005 Def Estab
P223 _CDA_P223 (Siltez-Yaquina) 2003 Def Estab
GRSALTLK Great Salt Lake 2001 Def Estab
GL-II Lake Erie 2005 Def Estab
MED-IX None 1951 Def Estab
P093 _CDA_P093 (San Pablo Bay) 2004 Def Estab
P155 _CDA_P155 (Sixes) 2002 Def Estab
P200 Alsea River 2007 Def Estab
P210 Yaquina Bay 2008 Def Estab
P240 Tillamook Bay 2007 Def Estab
P270 Willapa Bay 2002 Def Estab
P135 _CDA_P135 (Mad-Redwood) 2008 Def Estab
AG-2 None 2008 Def Estab
P290 Puget Sound 2009 Def Estab
B-IV None 1897 Def Estab
AG-2 None 2008 Def Estab
P190 Siuslaw River 2012 Def Estab
P117 _CDA_P117 (Mattole) 0 Def Estab
P064 _CDA_P064 (Ventura) 2012 Def Estab
P146 _CDA_P146 (Chetco) 2008 Def Estab
L013 _CDA_L013 (St. Louis River) 2005 Def Estab
L046 _CDA_L046 (Pike-Root) 2006 Def Estab
L105 _CDA_L105 (Buffalo-Eighteenmile) 2005 Def Estab
L111 _CDA_L111 (Oak Orchard-Twelvemile) 1991 Def Estab
L098 _CDA_L098 (Black-Rocky) 2006 Def Estab
L123 _CDA_L123 (St. Lawrence River) 1994 Def Estab
P250 Nehalem River 2011 Def Estab
L103 _CDA_L103 (Chautauqua-Connaut) 2006 Def Estab
P280 Grays Harbor 2013 Def Estab
NEA-II None 1889 Def Estab
NEA-IV None 0 Def Estab
NEA-V None 1978 Def Estab
P160 Coquille River 2014 Def Estab
P100 Drakes Estero 2014 Def Estab
P080 Monterey Bay 2008 Def Estab
NEA-III None 0 Def Estab
B-I None 0 Def Estab
P050 San Pedro Bay 2015 Def Estab
NZ-IV None 0 Native Estab
NZ-VI None 0 Native Estab
P293 _CDA_P293 (Strait of Georgia) 2018 Def Estab
MED-II None 1924 Def Estab
M090 Delaware Bay 2021 Def Estab

Occurrence Map

OCC_ID Author Year Date Locality Status Latitude Longitude

References

Adema, C. M.; Lun, C-M.; Hanelt, B.; Seville, R. S. (2009) Digenean trematode infections of native freshwater snails and invasive Potamopyrgus antipodarum in the Grand Teton National Park/John D. Rockefeller Memorial Parkway area, Journal of Parasitology 95(1): 224-227

Alonso, Álvaro; Castro-Díez, Pilar (2012) Tolerance to air exposure of the New Zealand mudsnail Potamopyrgus antipodarum (Hydrobiidae, Mollusca) as a prerequisite to survival in overland translocations, Neobiota 14: 67-74

Alonso, Alvaro; Castro-Diez, Pilar (2012) The exotic aquatic mud snail Potamopyrgus antipodarum (Hydrobiidae, Mollusca): state of the art of a worldwide invasion, Aquatic Science 74: 375-383

Arango, Clay Porter; Riley, Leslie Anne; Tank, Jennifer Leah; Hall, Robert Ogden Jr. (2009) Herbivory by an invasive snail increases nitrogen fixation in a nitrogen-limited stream, Canadian Journal of Fisheries and Aquatic Science 66: 1309-1317

Araya, Juan Francisco (2015) Current status of the non-indigenous molluscs in Chile, with the first record of Otala punctata (Müller, 1774) (Gastropoda: Helicidae) in the country and new records for Cornu aspersum (Müller, 1774) and Deroceras laeve (Müller,, Journal of Natural History 49(29-30): 1731-1761

Bañón, Rafael; Rolán, Emilio; García-Tasende, Manuel (2008) First record of the purple dye murex Bolinus brandaris (Gastropoda: Muricidae) and a revised list of non native molluscs from Galician waters (Spain, NE Atlantic)., Aquatic Invasions 3(3): 331-334

Bersine, Karen and 9 authors (2008) Distribution of the invasive New Zealand mudsnail (Potamopyrgus antipodarum) in the Columbia River Estuary and its first recorded occurrence in the diet of juvenile Chinook salmon (Oncorhynchus tshawytscha), Biological Invasions 10(8): 1381-1388

Boets, Pieter; Lock, Koen; Goethals, Peter L. M. (2011) Using long-term monitoring to investigate the changes in species composition in the harbour of Ghent (Belgium), Hydrobiologia 663: 155-166

Brenneis, Valance E. F.; Sih, Andrew; de Rivera, Catherine E. (2010) Coexistence in the intertidal: interactions between the nonindigenous New Zealand mud snail Potamopyrgus antipodarum and the native estuarine isopod Gnorimosphaeroma insulare, Oikos 119: 1755-1764

Brenneis, Valance E. F.; Sih, Andrew; de Rivera, Catherine E. (2011) Integration of an invasive consumer into an estuarine food web: direct and indirect effects of the New Zealand mud snail, Oecologia 167: 169-179

Butkus, Rokas; Sidagyt?, Egl?; Arba?iauskas, K?stutis (2012) Two morphotypes of the New Zealand mud snail Potamopyrgus antipodarum (J.E. Gray, 1843) (Mollusca: Hydrobiidae) invade Lithuanian lakes, Aquatic Invasions 7(2): 211-218

Calder, Dale R. (2013) Some shallow-water hydroids (Cnidaria: Hydrozoa) from the central east coast of Florida, USA, Zootaxa 3648: 1-72

Carlsson, Ralf (2006) Freshwater snail assemblages of semi-isolated brackish-water bays on the Aland Islands, SW Finland, Boreal Environment Research 11: 371-382

Chainho, Paula and 20 additional authors (2015) Non-indigenous species in Portuguese coastal areas, lagoons, estuaries, and islands, Estuarine, Coastal and Shelf Science <missing volume>: <missing location>

Cheng, Yuk W.; LeClair, Larry L. (2011) A quantitative evaluation of the effect of freezing temperatures on the survival of New Zealand mudsnails (Potamopyrgus antipodarum Gray, 1843), in Olympia Washington's Capitol Lake, Aquatic Invasions 6(1): corrected proof

Chukhchin, V. D. (1984) {Ecology of gastropod mollusks of the Black Sea}, In: (Eds.) . , <missing place>. Pp. <missing location>

Cox, Timothy J.; Rutherford, J. Christopher (2000) Predicting the effects of time-varying temperatures on stream invertebrate mortality, New Zealand Journal of Marine and Freshwater Research 34: 209-215

Crosier, Danielle M.; Molloy, Daniel P.; Richards, David C. (2006) <missing title>, US Army Corps of Engineers, <missing place>. Pp. 1-8

Cunha, M. R.; Moreira, M. H. (1995) Macrobenthos of Potamogeton and Myriophyllum beds in the upper reaches of Canal de Mira (Ria de Aveiro, NW Portugal): community structure and environmental factors, Netherlands Journal of Aquatic Biology 29(3-4): 377-390

Davidson, Timothy M.; Brenneis, Valance E. F.; de Rivera, Catherine; Draheim, Robyn; Gillespie, Graham E.; Graham E. (2008) Northern range expansion and coastal occurrences of the New Zealand mud snail Potamopyrgus antipodarum (Gray, 1843) in the northeast Pacific., Aquatic Invasions 3(3): 349-353

Drown, Devin M.; Levri, Edward P.; Dybdahl, Mark F. (2011) Invasive genotypes are opportunistic specialists not general purpose genotypes, Evolutionary Applications 4: 132-143

Dybdahl, Mark F.; Drown, Devin M. (2011) The absence of genotypic diversity in a successful parthenogenetic invader, Biological Invasions 13: 1663-1672

Eno, N. Clare; Clark, Robin A.; Sanderson, William G. (1997) <missing title>, Joint Nature Conservation Committee, Peterborough. Pp. <missing location>

Ezhova, Elena; Zmudzinski, Ludwik; Maciejewska, Krystyna (2005) Long-term trends in the macrobenthos of the Vistula Lagoon, southeastern Baltic Sea. Species composition and biomass distribution, Bulletin of the Sea Fisheries Institute (Poland) 1: 55-73

Filippenko, Dmitry P.; Son, Mikhail O. (2008) The New Zealand mud snail Potamopyrgus antipodarum (Gray, 1843) is colonising the artificial lakes of Kaliningrad City, Russia (Baltic Sea Coast), Aquatic Invasions 3(3): 345-347

Fromme, A. Emblidge; Dybdahl, M. F. (2009) Resistance in introduced populations of a freshwater snail to native range parasites., Journal of Evolutionary Biology 19(6): 1948-1955

Geist, Jeremy A.; . Mancuso, Jasmine L.; Morin, Morgan M.; Bommarito, Kennedy P.; Bovee, Emily N.; Wendell, Doug;; Burroughs, Bryan; Luttenton, Mark (2022) The New Zealand mud snail (Potamopyrgus antipodarum): autecology and management of a global invader, Biological Invasions 24: 905–938

Gerard, Claudia; Blanc, Alexia; Costil, Kathernine (2003) Potamopyrgus antipodarum (Mollusca: Hydrobiidae) in continental aquatic gastropod communities: impact of salinity and trematode parasitism., Hydrobiologia 493: 167-172

Goldberg, Caren S.; Sepulveda, Adam; Ray, Andrew; Baumgardt, Jeremy; Waits, Lisette P. (2013) Environmental DNA as a new method for early detection of New Zealand mudsnails (Potamopyrgus antipodarum), Freshwater Science 32(3): 792-800

Gomiou, Marian-Traian; Alexandrov, Boris; Shadrin, Nikolai; Zaitsev, Yuvenaly (2002) The Black Sea- a recipient, donor, and transit area for alien species., In: Leppakoski, E.; Gollasch, S.; Olenin, S.(Eds.) Invasive aquatic species of Europe: Distribution, impacts, and management.. , Dordrecht. Pp. 341-350

Goulletquer, Philippe; Bachelet, Guy; Sauriau, Pierre; Noel, Pierre (2002) Invasive aquatic species of Europe: Distribution, impacts, and management., Kluwer Academic Publishers, Dordrecht. Pp. 276-290

Gruszka, P. (1999) The river Odra estuary as a gateway for alien species immigration to the Baltic Sea basin., Acta Hydrochemica et Hydrobiologica 27: 374-382

1996 Potamopyrgus antipodarum (Gray). Web address http://rivers/oscs.montana.edu/dlg/aim/mollusca/potant. Html

Hall, Robert 0. Jr.;Tank, Jennifer L.; Dybdahl, Mark F. (2003) Exotic snails dominate nitrogen and carbon cycling in a highly productive stream, Frontiers in Ecology and the Environment 1(8): 407-411

Hellmair, Michael; Goldsmith, Greg; Kinziger, Andrew P. (2011) Preying on invasives: the exotic New Zealand mudsnail in the diet of the endangered tidewater goby, Biological Invasions 13: published online

Hershler, Robert; Liu, Hsiu-Ping; Clark, William H. (2012) Comments on ‘‘The absence of genotypic diversity in a successful parthenogenetic invader’’ by Mark Dybdahl and Devin Drown [Biological Invasions 13 (2011), 1663–1672], Biological Invasions 14: published online

Holopainen, Reetta; Lehtiniemi, Maiju; Meier, H. E. Markus; Albertsson, Jan; Gorokhova, Elena; Kotta, Jonne; Viitasalo, Markku (2016) Impacts of changing climate on the non-indigenous invertebrates in the northern Baltic Sea by end of the twenty-first century, Biological Invasions Published online: <missing location>

Hopkins, C.C.E. (2002) Invasive aquatic species of Europe: Distribution, impacts, and management., Kluwer Academic Publishers, <missing place>. Pp. 240-253

Hoy, Marshal; Boese, Bruce L.; Taylor, Louise; Reusser, Deborah; Rodriguez, Rusty (2012) Salinity adaptation of the invasive New Zealand mud snail (Potamopyrgus antipodarum) in the Columbia River estuary (Pacific Northwest, USA): physiological and molecular studies, Aquatic Ecology 46: 249-260

Jablonska-Barna, Izabela; Rychter, Agata; Kruk, Marek (2013) Biocontamination of the western Vistula Lagoon (south-eastern Baltic Sea, Poland), Oceanologia 53(3): 751-763

Jensen, Kathe R.; Knudsen, Jorgen (2005) A summary of alien marine benthic invertebrates in Danish waters., Oceanological and Hydrobiological Studies 34 (suppl. 1): 137-161

Karatayev, Alexander Y. and 5 authors (2012) Exotic molluscs in the Great Lakes host epizootically important trematodes, Journal of Shellfish Research 31: 885-894

Keller, Reuben P.; Drake, John M.; Lodge, David M. (2007) Fecundity as a basis for risk assessment of nonindigenous freshwater molluscs, Conservation Biology 21(1): 191-200

Kerans, B. L.; Dybdahl, M. F.; Gangloff, M. M.; Jannot, J. E. (2005) Potamopyrgus antipodarum: Distribution, density, and effects on native macroinvertebrate assemblages in the Greater Yellowstone Ecosystem2005, Journal of the North American Benthological Society 24(1): 123-138

Kerckhof, Francis; Haelters, Jan; Gollasch, Stephan G. (2007) Alien species in the marine and brackish ecosystem: the situation in Belgian waters., Aquatic Invasions 2(3): 243-257

Krist, Amy C.; Lively, Curtis M. (1998) Experimental exposure of juvenile snails (Potamopyrgus antipodarum) to infection by trematode larvae (Microphallus sp.): infectivity, fecundity compensation and growth, Oecologia 116: 575-582

Lassen, Hans Heidemann (1979) Reproductive effort in Danish mudsnails (Hydrobiidae), Oecologia 40(3): 365-369

Laverty, Ciaran; Nentwig, Wolfgang; Dick, Jaimie T.A.; Lucy, Frances E. (2015) Alien aquatics in Europe: assessing the relative environmental and socioeconomic impacts of invasive aquatic macroinvertebrates and other taxa, Management of Biological Invasions 6: In Press

Leclair; Larry L.; Cheng, Yuk W. (2011) A review of salinity tolerances for the New Zealand mudsnail (Potamopyrgus antipodarum, Gray 1843) and the effect of a controlled saltwater backflush on their survival in an impounded freshwater lake, Journal of Shellfish Research 30(3): 905-914

Leidenberger, Sonja; Obst, Matthias; Kulawik, Robert; Stelzer, Kerstin; Heyer, Karin; Hardisty, Alex; Bourlat, Sarah J. (2015) Evaluating the potential of ecological niche modelling as a component in marine non-indigenous species risk assessments, Marine Pollution Bulletin 97: 470-487

Leppakoski, Erkki; Olenin, Sergei (2000) Non-native species and rates of spread: lessons from the brackish Baltic Sea., Biological Invasions 2: 151-163

Leppäkoski, Erkki (1994) Non-indigenous species in the Baltic Sea., In: Boudouresque, C.F., Briand, F., and Nolan, C.(Eds.) Introduced Species in European Coastal Waters.. , Brussels. Pp. 67-75

Levri, Edward P.; Clark, T. J. (2014) Behavior in invasive New Zealand mud snails (Potamopyrgus antipodarum) is related to source population, Biological Invasions Published online: <missing location>

Levri, Edward P.; Colledge, Elissa D.; Bilka, Rachel H.; Smith, Brittany J. (2012) The distribution of the invasive New Zealand mud snail (Potamopyrgus antipodarum) in streams in the Lake Ontario and Lake Erie watersheds, Bioinvasion Records 1: in press

Levri, Edward P.; Kelley, Ashley A.; Love, Eric (2007) The invasive New Zealand Mud Snail (Potamopyrgus antipodarum) in Lake Erie., Journal of Great Lakes Research 33: 1-6

Liu, H.-P.; Hershler, R.; Marn, J.; Worsfold, T. M. (2012) Microsatellite evidence for tetraploidy in invasive populations of the New Zealand Mudsnail, Potamopyrgus antipodarum (Gray, 1843), Journal of Molluscan Studies 78: 227-230

Loo, Sarina (2012) A handbook of global freshwater invasive species, Earthscan, New York ,NY. Pp. 223-231

Loo, Sarina E.; Mac Nally, Ralph; Lake, P. S. (2007) Forecasting New Zealand mudsnail invasion range: model comparisons using native and invaded ranges, Ecology 17(1): 181-189

Merilainen, Jamo (1988) Meiobenthos in relation to macrobenthic communities in a low-saline, partly-acidified estuary, Bothnian Bay, Finland, Annales Zoologici Fennici 25: 277-292

Moffitt, Christine M.; James, Christopher A. (2012) Response of New Zealand mudsnails Potamopyrgus antipodarum to freezing and near-freezing fluctuating water temperatures, Freshwater Science 31(4): 1035-1041

Moore, Jonathan W.; Herbst, David B.; Heady, Walter N.; Carlson, Stephanie M. (2012) Stream community and ecosystem responses to the boom and bust of an invading snail, Biological Invasions 14: published online

Múrria, Cesc; Bonada, Núria; Prat, Narcís (2008) Effects of the invasive species Potamopyrgus antipodarum (Hydrobiidae, Mollusca) on community structure in a small Mediterranean stream, Archiv fur Hydrobiologie 171(2): 131-143

Nakano, Daisuke; Strayer, David L. (2014) Biofouling animals in fresh water: biology, impacts, and ecosystem engineering, Frontiers in Ecology and the Environment 12(3): 167: 175

Naser, M. D.; Son. M. O.; Yasser, A.Gh. (2011) [Assessing the risks of aquatic invertebrates invasions in the Shatt-al-Arab River] (Russian), Russian Journal of Biological Invasions 1: 77-85

Naser, Murtada D.; Son, Mikhail O. (2009) First record of the New Zealand mud snail Potamopyrgus antipodarum (Gray 1843) from Iraq: the start of expansion to Western Asia?, Aquatic Invasions 4(2): 369-372

2011-2013 Invasive species of Japan. http://www.nies.go.jp/biodiversity/invasive/index_en.html

Nehring, Stefan (2006) Four arguments why so many alien species settle into estuaries, with special reference to German River Elbe., Helgoland Marine Research 60: 127-134

Neiman, M.; Larkin, K.;Thompson, A. R.;Wilton, P. (2012) Male offspring production by asexual Potamopyrgus antipodarum, a New Zealand snail, Heredity 109: 57-62

New Zealand Mudsnail Management and Control Plan Working Group (2007) <missing title>, Aquatic Nuisance Species Task Force, Washington DC. Pp. <missing location>

Nikolaev, I. N. (1951) [On new additions to the fauna and flora of the North sea and Baltic from distant regions], Zoologicheskii Zhurnal 30(8): 556-561

2013 Marine non-native invasive species in Northern Ireland. http://invasivespeciesireland.com/wp-content/uploads/2013/03/Julia-Nunn.pdf

Ojaveer, Henn; Kotta, Jonne; Pollumae, Arno; Pollupuu, Maria; Jaanus, Andres; Vetemaa, Markus (2011) Alien species in a brackish water temperate ecosystem: Annual-scale dynamics in response to environmental variability, Environmental Research 111: 933-942

2000-2016 Inventory of Baltic Sea alien species. http://www.ku.lt/nemo/species.htm

Olenin, Sergej, Leppakoski, Erkki (1999) Non-native animals in the Baltic Sea: alteration of benthic habitats in coastal inlets and lagoons., Hydrobiologia 393: 233-243

Orlova, M. I.; Kommendatov, A. Yu. (2013) [The use of laboratory populations of the invasive New Zealand mollusk, Potamopyrgus antipodarum (Gastropoda, Hydrobiidae), for assessment of its euryhalinity and physical modelling of invasion in relation to the salinity gradient], Zoologicheskii Zhurnal 92(7): 759-770

Oscoz, Javier; Tomás, Pedro; Durán, Concha (2009) Review and new records of non-indigenous freshwater invertebrates in the Ebro River basin (Northeast Spain), Aquatic Invasions 5(3): 263-284

Piscart, Christophe; Kefford, Ben J.; Beisel, Jean-Nicoloas (2011) Are salinity tolerances of non-native macroinvertebrates in France an indicator of potential for their translocation to a new area?, Limnologica 41: 107-112

Ponder, W.F. (1988) Potamopyrgus antipodarum -- A molluscan coloniser of Europe and Australia, Journal of Molluscan Studies 54: 271-285

Radea, Canella; Louvrou, Ioanna; Economou-Amilli, Athena (2008) First record of the New Zealand mud snail Potamopyrgus antipodarum J.E. Gray 1843 (Mollusca: Hydrobiidae) in Greece – Notes on its population structure and associated microalgae, Aquatic Invasions 3(3): 341-344

Richards, David C.; O'Connell, Pat; Shinn, Dianne Cazier (2004) Simple control method to limit the spread of New Zealand mudsnail Potamopyrgus antipodarum., North American Journal of Fisheries Management 24: 114-117

Riley, Leslie A.; Dybdahl, Mark F.; Hall, Robert O. Jr. (2008) Invasive species impact: asymmetric interactions between invasive and endemic freshwater snails, Journal of the North American Benthological Society 27(3): 509-520

Schreiber, E. S. G; Quinn, G. P.; Lake, P. S. (2003) Distribution of an alien snail in relation to flow variability, human activities and water quality., Freshwater Biology 48: 951-961

Sepulveda, A. J.;Marczak, L. B. (2011) Active dispersal of an aquatic invader determined by resource and flow conditions, Biological Invasions 13: published online

Shimada, Kumiko; Urabe, Misako (2003) Comparative ecology of the freshwater snail Potamopyrgus antipodarum and the indigenous snail Semisulcospira spp., Venus 62: 1-3

Son, Mikhail O. (2008) Rapid expansion of the New Zealand mud snail Potamopyrgus antipodarum (Gray, 1843) in the Azov-Black Sea Region., Aquatic Invasions 3(3): 335-340

Souto; Javier; Ramalhosa, Patrício;' Canning-Clode, João (2018) Three non-indigenous species from Madeira harbors, including a new species of Parasmittina (Bryozoa), Marine Biodiverisity 48: 977-986

Sytsma, Mark D.; Cordell, Jeffrey R.; Chapman, John W.; Draheim, Robyn, C. (2004) <missing title>, Center for Lakes and Reservoirs, Portland State University, Portland OR. Pp. <missing location>

Thomsen, Mads S. ; Wernberg, Thomas ; Tuya, Fernando; Silliman, Brian R. (2009) Evidence for impacts of nonindigenous macroalgae: a meta-analysis of experimental field studies, Journal of Phycology 35: 812-819

Trebitz, Anett S. and 5 authors (2010) Status of non-indigenous benthic invertebrates in the Duluth-Superior Harbor and the role of sampling methods in their detection, Journal of Great Lakes Research 36: 747-756

2003-2015 Nonindigenous Aquatic Species Database. Gainesville, FL. http://nas.er.usgs.gov

van Leeuwen, Casper H. A.; van der Velde, Gerard; van Lith, Bart; Klaassen, Marcel (2012) Experimental quantification of long distance dispersal potential of aquatic snails in the gut of migratory birds, PLOS ONE 7(3): e32292

Verbrugge, Laura N. H.; Schipper, Aafke M.; Huijbregts, Mark A. J.; Van der Velde, Gerard; Leuven, Rob S. E. W. (2011) Sensitivity of native and non-native mollusc species to changing river water temperature and salinity, Biological Invasions 13: published online

Vinson; Mark R.; Baker, Michelle A. (2008) Poor growth of Rainbow Trout fed New Zealand Mud Snails Potamopyrgus antipodarum, North American Journal of Fisheries Management 28: 701-709

Wijnhoven, Sander; Hummel, Herman (2011) Patterns in macrozoobenthic assemblages indicate the state of the environment: insights from the Rhine-Meuse estuary, Marine Ecology Progress Series 436: 29-50

Winterbourn, Michael (1970) The New Zealand species of Potamopyrgus (Gastropoda: Hydrobiidae), Malacologia 10(2): 283-321

Wittfoth, Anne K. J.; Zettler, Michael L. (2013) The application of a Biopollution Index in German Baltic estuarine and lagoon waters, Management of Biological Invasions 4: in press

Wolff, W. J. (1973) The estuary as a habitat: An analysis of data on the soft-bottom macrofauna of the estuarine area of the rivers Rhine, Meuse, and Scheldt, Zoologische Verhandelingen 126: 4-242

Wolff, W. J. (2005) Non-indigenous marine and estuarine species in the Netherlands., Zoologische Verhandelingen 79(1): 1-116

Zachar, Nicholas; Neiman, Maurine (2013) Profound effects of population density on fitness-related traits in an invasive freshwater snail, PLOS ONE 8(11): e80067

Zaiko, Anastasija; Lehtiniemi, Maiju; Narscius, Aleksas; Olenin, Sergej (2011) Assessment of bioinvasion impacts on a regional scale: a comparative approach, Biological Invasions 13: 1739-1765

Zaranko, Danuta T., Farara, Dennis G., Thompson, Fred G. (1997) Another exotic mollusc in the Laurentian Great Lakes: the New Zealand native Potamopyrgus antipodarum (Gray 1843) (Gastropoda, Hydrobiidae)., Canadian Journal of Fisheries and Aquatic Sciences 54: 809-814