Invasion HistoryFirst Non-native North American Tidal Record: 1938
First Non-native West Coast Tidal Record: 1938
First Non-native East/Gulf Coast Tidal Record:
General Invasion History:
Melita nitida has a wide native range in the Northwest Atlantic, from the southern Gulf of St. Lawrence to the Gulf of Mexico (Bousfield 1973) and the Caribbean coast of Colombia (Ortiz et al. 2007). This amphipod was first collected on the West Coast in San Francisco Bay, California in 1938 (Carlton 1979; Chapman 1988) and now occurs in estuaries from Howe Sound, British Columbia to the San Gabriel River, near Los Angeles (Carlton 1979; Graening et al. 2012; Murray et al. 2014). In 2000, it was first collected in European waters, in the Scheldt estuary, in the Netherlands (Faasse and van Moorsel 2003) and later (2010) in the Kiel Canal, Germany (Reichert and Beermann 2011).
There is some uncertainty about the identity of the amphipods usually identified as the Northwest Atlantic M. nitida. The Northwest Pacific M. setiflagellata Yamato 1987b is very similar, and has sometimes been considered synonymous, raising the possibility that Asian populations might have been introduced from the Atlantic (Doi et al. 2011) or that West Coast and European populations might have been introduced from Asia (Chapman 2007; Reichert and Beermann 2011; Graening et al. 2012). Currently, most authors use the name M. nitida for the introduced populations on the West Coast and Europe.
North American Invasion History:
Invasion History on the West Coast:
Melita nitida was first collected in the Northeast Pacific at Point Richmond and Lake Merritt (Oakland) in San Francisco Bay, California (CA) in 1938-41 (Carlton 1979). It is now widespread and abundant through the Bay, occurring as far upstream as Collinsville on the Sacramento River during droughts (Cohen and Carlton 1995; Peterson and Vayssieres 2010). It is abundant among tubes of the introduced polychaete Ficopomatus enigmaticus in San Francisco Bay (Carlton 1979; Chapman 1988). Melita nitida is commonly associated with Eastern Oysters (Crassostrea virginica) in its native range, and could have been transported with oyster transplants, but it also occurs in ship fouling communities (Woods Hole Oceanographic Institute 1952) and is a likely candidate for ballast water transport (Cohen and Carlton 1995).
Melita nitida has spread southward on the West Coast in a scattered fashion, to Elkhorn Slough, CA where it was first collected in 1975 (Carlton 1979; Chapman 1988; Wasson et al. 2001), the San Gabriel River estuary, and non-tidal freshwater portions of the Malibu Creek drainage, Los Angeles County in 2002 (M. Born and M. Abramson, Cadien 2007, cited by Graening et al. 2012). However, it has been introduced to many estuaries to the north, including: Coos Bay, Oregon (OR) in 1954 (Carlton 1979); Howe Sound, British Columbia in 1976 (Carlton 1979); Yaquina Bay, OR in 1986 (Chapman 1988); Alsea Bay, OR in 1987 (Chapman 1988); Willapa Bay, Washington (WA) in 1994 (Cohen et al. 2001); Puget Sound, WA in 1998 (Cohen et al. 2001); Humboldt Bay, CA in 2000 (Boyd et al. 2002); and the Columbia River, OR/WA in 2004 (2 specimens, Chapman in Sytsma et al. 2004). The times of first collection, listed above, do not suggest progressive dispersal by coastal currents, but may reflect frequency of collections in different estuaries. Beyond natural dispersal, this amphipod may have spread to West Coast estuaries by human mediated vectors including coastal shipping, bait packed in seaweed, or oyster transplants (Chapman 1988).
Invasion History Elsewhere in the World:
Melita nitida was first collected in the Northeast Atlantic in 1998, in the western Scheldt estuary, Netherlands, where it was found under boulders, often around oysters, near the low-tide mark in polyhaline waters (Faase and van Moorsel 2003). In 2010, 27 specimens were collected in the Kiel Canal, Germany, connecting the North and Baltic Seas, near the Baltic Sea entrance in Kiel (Reichert and Beermann 2011). Future establishment and spread of this amphipod in the North Sea and Baltic seems likely. In 2013-2016, M. nitida was collected at 3 sites on the French coast of the Bay of Biscay: the Gironde estuary, Arcachon Bay (an important oyster-culture site), and Hossegar Lake, near the Spanish border. Shipping is a possible vector in the Gironde estuary and recreational boating is popular on the whole coast (Gouillieux et al. 2016).
Melita nitida has a slender and laterally compressed body with small and oval eyes. Coxal plates 1-4 are large and rounded below. Antenna 1 is long and robust, ~2/3 body length, with a large flagellum of many segments, whorls of stiff setae, and a small accessory flagellum of three segments. On Antenna 2, peduncle segment 5 and the flagellum are densely covered with whorls of stiff setae.
In the male, Gnathopod 1 has a short dactyl, arising on the anterior margin, with the tip curled inward, closing on the inner face of the propodus (segment 6). Gnathopod 2 is larger than Gnathopod 1 in both sexes, but the male has segments 4, 5, and 6 more enlarged, with a smooth, convex palm, and with the dactyl tip closing on the inner side of the palmar angle. The female Gnathopod 2 is similar, but smaller. The basal segments of pereiopods 5-7 are greatly expanded, especially on the posterior-distal corner. The female's Coxa 5 is ventrally extended. The pleon and urosome segments lack dorsal teeth or mucrons (spines or points in the posterior corners). However, Urosome segment 2 has two small clusters of dorsolateral spines. Uropods 1 and 2 are long, extending rearward, beyond the peduncle of Uropod 3. The telson is deeply bilobed, with each lobe having apical and subapical spines. Males reach 12 mm and females reach 9 mm. The color is grayish, with darker bands and a red spot on the head. Description based on: Holmes 1905, Mills 1964, Bousfield 1973, and Chapman 2007.
Parts of the species' range are uncertain, with records which may refer to very similar species. Sheridan (1979, cited by Chapman 1988) described three very similar species (M. elongata, M. intermedia, and M. longisetosa) from the Gulf of Mexico, but Chapman (1988) considered their status uncertain, until comparisons could be made with the lectotypes of M. nitida. Records of M. nitida from the Pacific coast of Mexico (Shoemaker 1935, cited by Chapman 1988; Hendrickx, in Low-Pfeng and Recagno 2012) may refer to an undescribed species of Melita. Melita nitida is nearly indistinguishable from the NW Pacific M. setiflagellata (Yamato 1987b). Some or all West Coast populations could be the latter (Chapman, in Carlton 2007; Graening et al. 2012). Molecular studies of the genus are desirable, but until these are performed we will treat the US West Coast populations as M. nititda.
Potentially Misidentified Species
Melita oregonensis Barnard 1954 is a West Coast native of rocky shores (Chapman 2007).
Melita rylovae Bulycheva 1955 is a Northwestern Pacific species, introduced to the California coast (Chapman 20007).
Melita setiflagellata Yamato 1987 is a very similar species described from Japan. Some authors have treated this amphipod as conspecific with M. nitida and an introduction in Japan, but most regard it as native in Japan (Doi et al. 2011). Given the similarity, some populations of 'M. nitida' on the West Coast could actually be M. setiflagellata (Chapman 2007; Graening et al. 2012). Molecular studies of this amphipod are desirable.
Melita sulca Barnard 1954 is a West Coast native of harbors, cobble bottoms, and kelp beds (Chapman 2007).
Melita nitida is a free-living gammarid amphipod found in shallow, muddy estuaries, salt marshes, mudflats, oyster beds, and fouling communities (Bousfield 1973; Borowsky 1980). In gammarid amphipods, sexes are separate, the young are brooded, and development is direct (Bousfield 1973). Females in Jamaica Bay, New York, had broods of 5-51 embryos, with a mean of 30. Embryos took 10 days to develop at 17C, and 5 days at 21C, and then were brooded as juveniles for less than 2 days before release (Borowsky 1980). Colonization of new patches of habitat is done by adults (Mungia et al. 2007).
Melita nitida is known from temperatures of 0-32C and salinities of 0-35 PSU (Bousfield 1973; Sheridan 1979; Chapman 1988). It is known from a wide range of habitats, including: intertidal mudflats and algal masses, intertidal rocks and debris, clumps of hydroids and bryozoans, floats and pilings, buoys, and crevices under oysters and other bivalve shells (Bousfield 1973; Sheridan 1979; Chapman 1988; Mungia et al. 2007). It was also found in the fouling of a retired cargo ship moored in Suisun Bay, California (Llansó et al. 2011). Melita nitida in the Indian River Lagoon, Florida, fed mostly on seagrass epiphytes, and to a lesser degree on seagrass debris (Zimmerman et al. 1979). Opportunistic predation and scavenging is common in gammarid amphipods, but has not been reported for M. nitida. Likely predators include crabs, shrimps, fishes, and shorebirds.
Epiphytic algae, seagrass debris
|General Habitat||Coarse Woody Debris||None|
|General Habitat||Tidal Fresh Marsh||None|
|General Habitat||Oyster Reef||None|
|General Habitat||Marinas & Docks||None|
|General Habitat||Salt-brackish marsh||None|
|General Habitat||Grass Bed||None|
|Salinity Range||Limnetic||0-0.5 PSU|
|Salinity Range||Oligohaline||0.5-5 PSU|
|Salinity Range||Mesohaline||5-18 PSU|
|Salinity Range||Polyhaline||18-30 PSU|
|Salinity Range||Euhaline||30-40 PSU|
|Tidal Range||Low Intertidal||None|
|Tidal Range||Mid Intertidal||None|
Tolerances and Life History Parameters
|Minimum Temperature (ºC)||0||Based on geographical range|
|Maximum Temperature (ºC)||32||Field data, Florida, (Sheridan 1979, cited by Faasse and van Moorsel 2003)|
|Minimum Salinity (‰)||0||Field data, San Francisco Bay (Cohen and Carlton 1995)|
|Maximum Salinity (‰)||35||Field data, New England (Bousfield 1973); California (Chapman 1988).|
|Minimum Length (mm)||5||Minimum size of females (Borowsky 1980)|
|Maximum Length (mm)||12||Adult females, males 9 mm (Bousfield 1973)|
|Broad Temperature Range||None||Cold temperate-Tropical|
|Broad Salinity Range||None||Tidal Limnetic-Euhaline|
General ImpactsMelita nitida is common in many West Coast estuaries. It is probably a prey item for fishes and shorebirds; however, no specific impacts have been reported.
Regional Distribution Map
|Bioregion||Region Name||Year||Invasion Status||Population Status|
|NA-ET2||Bay of Fundy to Cape Cod||0||Native||Estab|
|NA-ET3||Cape Cod to Cape Hatteras||0||Native||Estab|
|CAR-VII||Cape Hatteras to Mid-East Florida||0||Native||Estab|
|CAR-I||Northern Yucatan, Gulf of Mexico, Florida Straits, to Middle Eastern Florida||0||Native||Estab|
|NEP-V||Northern California to Mid Channel Islands||1938||Def||Estab|
|NEP-IV||Puget Sound to Northern California||1954||Def||Estab|
|NEP-III||Alaskan panhandle to N. of Puget Sound||1976||Def||Estab|
|P090||San Francisco Bay||1938||Def||Estab|
|P093||_CDA_P093 (San Pablo Bay)||1938||Def||Estab|
|NEP-VI||Pt. Conception to Southern Baja California||2007||Def||Estab|
|P045||_CDA_P045 (Santa Ana)||2007||Def||Estab|
|768140||Ruiz et al., 2015||2012||2012-09-06||Loch Lomond Marina, San Francisco Bay, CA, California, USA||Def||37.9736||-122.4802|
ReferencesMoisander, Pia H.; Daley, Meaghan C. 2015 Identification of the benthic cyanobacterium <em>Hydrocoleum lyngbyaceua</em> on the nantucket island. in: Nantucket Biodiversity Initiative’s 6th Biennial Research Conference Abstracts, p.6 14 November, 2015, Nantucket MA
Associated Press (12/2021) Lummi Nation declares disaster after invasive crab arrives, Seattle Times <missing volume>: <missing location>
Borowsky, B. (1980) Reproductive patterns of three intertidal salt-marsh gammaridean amphipods, Marine Biology 55: 327-334
Bousfield, E.L. (1973) <missing title>, Comstock Publishing Associates, Ithaca, NY. Pp. <missing location>
Boyd, Milton J.; Mulligan, Tim J; Shaughnessy, Frank J. (2002) <missing title>, California Department of Fish and Game, Sacramento. Pp. 1-118
Carlton, James T. (1979) History, biogeography, and ecology of the introduced marine and estuarine invertebrates of the Pacific Coast of North America., Ph.D. dissertation, University of California, Davis. Pp. 1-904
Carlton, James T. (1989) <missing title>, <missing publisher>, <missing place>. Pp. <missing location>
Carlton, James T. (Ed.) (2007) <missing title>, University of California Press, Berkeley. Pp. <missing location>
Chapman, John W. (1988) Invasions of the Northeast Pacific by Asian and Atlantic Gammaridean amphipod crustaceans, including a new species of Corophium, Journal of Crustacean Biology 8(3): 364-382
Chapman, John W. (2007) The Light and Smith Manual: Intertidal invertebrates from Central California to Oregon (4th edition), University of California Press, Berkeley CA. Pp. 545-611
Chiaravalle, Katina; Hughes, Jeff; Javonillo, Robert; Deegan, Linda (1997) Tidal river riffle habitats support high diversity and abundance of gammaridean amphipods, Biological Bulletin 1997: 285-285
Cohen, Andrew N. and 10 authors (2005) <missing title>, San Francisco Estuary Institute, Oakland CA. Pp. <missing location>
Cohen, Andrew N. and 22 authors (2001) <missing title>, Washington State Department of Natural Resources, Olympia. Pp. <missing location>
Cohen, Andrew N.; Carlton, James T. (1995) Nonindigenous aquatic species in a United States estuary: a case study of the biological invasions of the San Francisco Bay and Delta, U.S. Fish and Wildlife Service and National Sea Grant College Program (Connecticut Sea Grant), Washington DC, Silver Spring MD.. Pp. <missing location>
Cohen, Andrew; and 16 authors. (1998) <missing title>, Washington State Department of Natural Resources, Olympia, Washington. Pp. 1-37
Doi, Waturu; Watanabe, Seiichi; Carlton, James T. (2011) In the wrong place- Alien marine crustaceans: Distribution, biology, impacts, Springer, Dordrecht, Netherlands. Pp. 419-449
Faasse, Marco (2012) The exotic isopod Synidotea in the Netherlands and Europe, A Japanese or American invasion (Pancrustacea: Isopoda)?, Nederlandse Faunistiche Mededelingen 108: 103-106
Faasse, Marco; Van Moorsel, Godfried (2003) The North American amphipods, Melita nitida Smith, 1873 and Incisocalliope aestuarius (Watling and Maurer, 1973) (Crustacea: Amphipoda: Gammaridea), introduced to the Western Scheldt estuary (The Netherlands)., Aquatic Ecology 37: 13-22
Fairey, Russell; Dunn, Roslyn; Sigala, Marco; Oliver, John (2002) Introduced aquatic species in California's coastal waters: Final Report, California Department of Fish and Game, Sacramento. Pp. <missing location>
Feeley, James B.; Wass, Marvin L. (1971) The distribution and ecology of the Gammaridea (Crustacea: Amphipoda) of the lower Chesapeake estuaries., Special Papers in Marine Science 2: 1-58
Fox, Richard S.; Bynum, Kenneth H. (1975) The amphipod crustaceans of North Carolina estuarine waters, Chesapeake Science 16(4): 223-237
Gartner, Heidi N.; Murray, Cathryn Clarke; Frey, Melissa A.; Nelson, Jocelyn C.; Larson, Kristen J.; Ruiz, Gregory M.; Therriault, Thomas W. (2016) Non-indigenous invertebrate species in the marine fouling communities of British Columbia, Canada, BioInvasions Records <missing volume>: <missing location>
Gilhen, John (1968) Catalogue of marine crustacea in the Nova Scotia Museum, Nova Scotia Museum Curatorial Report 2: 1-12
Gimenez, Lucas H.; Rivera, Reinaldo J.; Brante, Antonio (2022) One step ahead of sea anemone invasions with ecological niche modeling: potential distributions and niche dynamics of three successful invasive species, Marine Ecologicy Progress Series 690: 83–95
Gouillieux, Benoit; Lavesque, Nicolas; Blanchet, Hugues; Bachelet, Guy (2016) First record of the non-indigenous Melita nitida Smith, 1873 (Crustacea: Amphipoda: Melitidae) in the Bay of Biscay (NE Atlantic), BioInvasions Records 5: In press
Graening, G. O.; Rogers, D. Christopher; Holsinger, John R.; Barr, Cheryl; Bottorff, Richard (2012) Checklist of inland aquatic Amphipoda (Crustacea: Malacostraca) of California, Zootaxa 3544: 1-27
Heiman, Kimberly W.; Micheli, Fiorenza (2010) Non-native ecosystem engineer alters estuarine communities, Integrative and Comparative Biology 50(2): 226-236
Heiman, Kimberly W.; Vidargas, Nicholas; Micheli, Fiorenza (2008) Non-native habitat as home for non-native species: Comparison of communities associated with invasive tubeworm and native oyster reefs., Aquatic Biology 2: 47-56
Holmes, S. J. (1905) The Amphipoda of southern New England., Bulletin of the Bureau of Fisheries 24: 457-541
Kim, Daemin; Taylor, Andrew T.; Near, Thomas J. (2022) Phylogenomics and species delimitation of the economically important Black Basses (Micropterus), Scientific Reports 12(9113): Published online
LeCroy, Sara E. (2000) <missing title>, 1 Florida Department of Environmental Protection, Tallahassee FL. Pp. 195
Liu, Wenliang; Liang, Xiaoli ; Zhu, Xiaojing (2015) A new record and mitochondrial identification of Synidotea laticauda Benedict, 1897 (Crustacea: Isopoda: Valvifera: Idoteidae) from the Yangtze Estuary, China, Zootaxa 4294: 371-380
Llansó, Roberto J.; Sillett, Kristine; Scott, Lisa (2011) <missing title>, Versar, Inc., Columbia MD. Pp. <missing location>
Low-Pfeng, Antonio; Recagno, Edward M. Peters (2012) <missing title>, Geomare, A. C., INESEMARNAT, Mexico. Pp. 236
Mach, Megan E.; Levings, Colin D.; Chan, Kai M. A. (2016) Nonnative species in British Columbia eelgrass beds spread via shellfish aquaculture and stay for the mild climate, Estuaries and Coasts Published online: <missing location>
Mills, Eric L. (1964b) Noteworthy amphipods in the collection of the Yale Peabody Museum, Postilla 79: 1-41
Munguia, Pablo; Mackie, Coleman, Levitan, Don R. (2007) The inXuence of stage-dependent dispersal on the population dynamics of three amphipod species, Oecologia 153: 533-541
Murray, Cathryn Clarke, and 5 authors (2014) Spatial distribution of marine invasive species: environmental, demographic and vector drivers, Diversity and Distributions 20: 824-836
Nelson, Walter G. (1995) Amphipod crustaceans of the Indian River Lagoon: current status and threats to biodiversity, Bulletin of Marine Science 57(1): 143-152
Norris, James N. (2010) Marine Algae of the northern Gulf of California: Chlorophyta and Phaeophyceae, Smithsonian Contributions to Botany 94: 1276
Ortíz, Manuel; Martín, Alberto; Díaz, Yusbelly J. (2007) [List and references of crustacean amphipods (Amphipoda: Gammaridea) of the Western Tropical Atlantic], Revista de Biologia Tropical 55(2): 479-498
Peterson, Heather A.; Vayssieres, Marc (2010) Benthic assemblage variability in the upper San Francisco estuary: A 27-year retrospective, San Francisco Estuary and Watershed Science <missing volume>: published online
Reichert, Katharina; Beermann, Jan (2011) First record of the Atlantic gammaridean amphipod Melita nitida Smith, 1873 (Crustacea) from German waters (Kiel Canal), Aquatic Invasions 6(1): 103-108
Sagasti, Alexandra; Schaffner, Linda G.; Duffy, J. Emmett (2000) Epifaunal communities thrive in an estuary with hypoxic epsiodes., Estuaries 23(4): 474-487
Sheridan, Peter F. (1979) Three species of Melita (Crustacea: Amphipoda), with notes on the amphipod fauna of the Appalachicola esturaty of Northwest Florida, Northeast Gulf Science 3(2): 60-73
Spikkeland, Ingvar; Nilssen, Jens Petter (2021) Alien amphipods (Arthopoda; Crustacea) in the Tista Estuary, Halden, southeastern Norway, Fauna Norvegica Series A 41: 34-40
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>
U.S. National Museum of Natural History 2002-2021 Invertebrate Zoology Collections Database. <missing description>
Wasson, Kerstin; Zabin, C. J.; Bedinger, L.; Diaz, M. C.; Pearse J. S. (2001) Biological invasions of estuaries without international shipping: the importance of intraregional transport, Biological Conservation 102: 143-153
Watling, Les; Maurer, Don (1972) Marine shallow water amphipods of the Delaware Bay area, U.S.A., Crustaceana <missing volume>: 251-266
Wonham, Marjorie J.; Carlton, James T. (2005) Trends in marine biological invasions at local and regional scales: the Northeast Pacific Ocean as a model system, Biological Invasions 7: 369-392
Woods Hole Oceanographic Institution, United States Navy Dept. Bureau of Ships (1952) Marine fouling and its prevention., United States Naval Institute., Washington, D.C.. Pp. 165-206
Yale Peabody Museum of Natural History 2008-2016 YPM Invertebrate Zoology - Online Catalog. http://peabody.yale.edu/collections/search-collections?iz
Yamato, Shigeyuki (1987b) Two species of the genus Melita (Crustacea: Amphipoda) from brackish waters in Japan, Publication of the Seto Marine Biological Laboratory 33(1/3): 79-95
Zettler, Michael L.; Daunys, Darius (2007) Long-term macrozoobenthos changes in a shallow boreal lagoon: Comparison of a recent biodiversity inventory with historical data., Limnologica 37: 170-185
Zimmerman, R. J. Gibson, R.; Harrington, J. (1979) Herbivory and detritivory among gammaridean amphipods in a Florida seagrass community, Marine Biology 54: 41-47