.JPG)
Invasion History
First Non-native North American Tidal Record: 1894First Non-native West Coast Tidal Record: 1894
First Non-native East/Gulf Coast Tidal Record:
General Invasion History:
The native range of Geukensia demissa spans from the southern Gulf of St. Lawrence to Palm Beach, Florida (Bousfield 1960; Abbott 1974; Morris 1975; Gosner 1978; Krisberg 2009). The Gulf Ribbed Mussel (Geukensia granossisima), formerly considered a subspecies of G. demissa occurs from northwest Florida to Texas (Sarver et al. 1992). Specimens introduced to the West Coast have been identified as G. demissa by molecular methods (Sarver et al. 1992).
North American Invasion History:
Invasion History on the West Coast:
Geukensia demissa was first collected on the West Coast in South San Francisco Bay in 1894 (Carlton 1979). It was introduced with plantings of Eastern Oysters (Miller 2007). It is now one of the most abundant bivalves in San Francisco Bay, from San Pablo Bay to South Bay, where it lines the edges of salt-marsh creeks, channel banks, and retaining walls, attached to the substrate or plant roots by byssus threads (Carlton 1979; Cohen and Carlton 1995). One specimen was collected in Tomales Bay, California (CA) in 1952, and there are other unverified records, for instance, it was reported from Tomales Bay by Fairey et al. (2002), based on a 2001 survey. This mussel was found in 1986 in Morro Bay, CA but was not reported during subsequent surveys in 2001 (Needles 2007). In Southern California, G. demissa was found in Newport Bay in 1955, Alamitos Bay in 1968 (Reish 1968, cited by Carlton 1979; 2000, Cohen et al. 2002; Burnaford et al. 2011), Anaheim Bay in 1972 (Reish 1972, cited by Carlton 1979), and the adjacent Bolsa Chica Lagoon in 1992 (Carlton 1992). Occurrences in southern California could be associated with Eastern Oyster transfers, but the documented transfers were few and small. Introductions with ballast water or fouling are possible. Further south, it is established and very abundant in Estero de Punta Banda, Baja California Norte, Mexico, where it was introduced by the early 1980s (Torchin et al. 2005).
Invasion History Elsewhere in the World:
Geukensia 'demissa' has been reported and studied in Lake Maracaibo, Venezuela, where it was introduced by 1994, and is now established (Romero et al. 2003; Baez et al. 2005). However, these records could refer to G. granossisima (Gulf Ribbed Mussel), which was formerly considered conspecific with G. demissa.
Description
Geukensia demissa has a moderately thin, oblong-oval shell. The outer surface is marked by numerous strong radial ribs with widely spaced growth lines. The beak of the shell is subterminal, located somewhat above the hinge of the shell. Hinge teeth are absent. The ventral portion of the shell is slightly curved inward. The exterior color is yellowish-green to bluish brown, while the interior is silvery white, and often iridescent. Adult mussels range from 20 to 1400 mm (Abbott 1974; Brousseau 1984; Coan et al. 2000; Coan and Vantich-Scott 2007). Larvae are described and illustrated by Chanley and Andrews (1971). The larvae are planktotrophic, and settle at 215-305 µm (Chanley and Andrews 1971).
Taxonomy
Taxonomic Tree
| Kingdom: | Animalia | |
| Phylum: | Mollusca | |
| Class: | Bivalvia | |
| Subclass: | Pteriomorphia | |
| Order: | Mytiloida | |
| Family: | Mytilidae | |
| Genus: | Geukensia | |
| Species: | demissa |
Synonyms
Arcuatula demissa (None, None)
Brachidontes demissus (None, None)
Ischadium demissum (None, None)
Modioulus plicatulus (Lamarck, 1819)
Volsella demissus (None, None)
Brachidontes demissus (None, None)
Ischadium demissum (None, None)
Modioulus plicatulus (Lamarck, 1819)
Volsella demissus (None, None)
Potentially Misidentified Species
Geukensia granossisima
(Sowerby 1914). Gulf Ribbed Mussel- this species had been regarded as a subspecies of G. demissa, but molecular analysis (enzyme electrophoresis) indicates that G. granossisimma and G. demissa are separate species (Sarver et al. 1992; Lee and O'Foighil 2004). Photographs posted by Krisberg (2009) show strong morphological differences between the forms, with a more hooked shape in G. granosissima, resembling mussels of the genus Ischadium, a similarity supported by molecular evidence (Lee and O'Foighil 2004).
Ischadium recurvum
Hooked Mussel- Young specimens are similar, but show strong curvature with growth.
(Sowerby 1914). Gulf Ribbed Mussel- this species had been regarded as a subspecies of G. demissa, but molecular analysis (enzyme electrophoresis) indicates that G. granossisimma and G. demissa are separate species (Sarver et al. 1992; Lee and O'Foighil 2004). Photographs posted by Krisberg (2009) show strong morphological differences between the forms, with a more hooked shape in G. granosissima, resembling mussels of the genus Ischadium, a similarity supported by molecular evidence (Lee and O'Foighil 2004).
Ischadium recurvum
Hooked Mussel- Young specimens are similar, but show strong curvature with growth.
Ecology
General:
Geukensia demissa has separate sexes. Animals mature at about one year of age. Sexes differ in the color of the mantle, with females being yellowish brown, while males are a cream color. Eggs are brooded, but sperm are released into the water column. Fertilized eggs develop into a planktonic trochophore larva, then into a shelled veliger. The larvae settle at 220-300 µm (Chanley and Andrews 1971).
Geukensia demissa larvae settle on rocks, wood, roots of marsh plants, and peat, though they are most abundant in marsh habitats (Abbott 1974; Morris 1975; Gosner 1978; Lippson and Lippson 1997). Marsh populations tolerate water temperatures from -1.8 to 37⁰C (Read and Cumming 1967, cited by Hicks and McMahon 2002), and doubtless survive higher air temperatures. They also tolerate wide ranges of salinity, from 5 to 70 PSU (Smithsonian Marine Station at Fort Pierce 2011).
Food:
Phytoplankton; Detritus
Consumers:
Birds, California Clapper Rail
Trophic Status:
Suspension Feeder
SusFedHabitats
| General Habitat | Unstructured Bottom | None |
| General Habitat | Oyster Reef | None |
| General Habitat | Marinas & Docks | None |
| General Habitat | Salt-brackish marsh | None |
| General Habitat | Vessel Hull | None |
| 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 |
| Vertical Habitat | Epibenthic | None |
| Vertical Habitat | Endobenthic | None |
Tolerances and Life History Parameters
| Minimum Temperature (ºC) | -2 | Based on geographical range |
| Maximum Temperature (ºC) | 37 | Experimental, ranges of 35-37 reported by Read and Cumming (1967), cited by Hicks and McMahon (2002) |
| Minimum Salinity (‰) | 5 | Field record (Miller 2000), Experimental, stepwise decrease (Wells 1961) |
| Maximum Salinity (‰) | 70 | Smithsonian Marine Station at Fort Pierce 2011. |
| Minimum Reproductive Temperature | 20 | Field data, North Carolina (Borerro 1987) |
| Maximum Reproductive Temperature | 28 | Field data, North Carolina (Borerro 1987) |
| Minimum Duration | 12 | Lab reared at 22 C (Loosanoff and Davis 1963) |
| Maximum Duration | 43 | Lab reared at 22 C (Loosanoff and Davis 1963) |
| Minimum Length (mm) | 20 | Minimum Adult Size (Brousseau 1984) |
| Maximum Length (mm) | 140 | Maximum Adult Size (Brousseau 1984) |
| Broad Temperature Range | None | Cold temperate-Subtropical |
| Broad Salinity Range | None | Mesohaline-Euhaline |
General Impacts
Geukensia demissa is very abundant in San Francisco Bay, California. Possible economic impacts include structural effects on marsh channels and dikes. Since these mussels constitute a very large biomass, they could have a significant ecological impact by filtering phytoplankton and competing for food with native bivalves. Some of these impacts also appear probable in Estero Puerto Bando, Mexico, based on field studies by Torchin et al. (2005). However, economic and ecological (experimental) studies of G. demissa have not been conducted in its introduced range.Ecological Impacts
Habitat Change- High densities of G. demissa in Estero de Punta Banda, Mexico, appear to facilitate growth of the native Pacific cordgrass Spartina foliosa, based on correlation of density of the two organisms (Torchin et al. 2005). The Ribbed Mussels also have a rather unusual impact on a native, endangered, bird. The rapidly closing shells of the mussels can trap chicks and sever toes of adult California Clapper Rails (Rallus longirostris obsoletus) in salt marshes (Carlton 1979; Cohen and Carlton 1995). Geukensia demissa represents a similar threat to another endangered subspecies, R. l. levipes, (Light-Footed Clapper Rail) in Estero Bando (Torchin et al., 2005).
Food/Prey- However, this abundant mussel is also a major food source for the California Clapper Rail (Moffitt 1941, cited by Cohen and Carlton 1995) and doubtless for other wading birds, raccoons, otters, and other salt-marsh predators.
Regional Impacts
| NEP-V | Northern California to Mid Channel Islands | Ecological Impact | Habitat Change | ||
| Closing shells can trap chicks and sever toes of adult endangered California Clapper Rails (Rallus longirostris obsoletus) in salt marshes (Carlton 1979; Cohen and Carlton 1995). | |||||
| P090 | San Francisco Bay | Ecological Impact | Habitat Change | ||
| Closing shells can trap chicks and sever toes of adult endangered California Clapper Rails (Rallus longirostris obsoletus) in salt marshes (Carlton 1979; Cohen and Carlton 1995). | |||||
| NEP-VI | Pt. Conception to Southern Baja California | Ecological Impact | Habitat Change | ||
| High densities of G. demissa in Estero de Punta Banda, Baja California Norte, Mexico, appear to facilitate growth of the native Pacific cordgrass Spartina foliosa. They also present a hazard to the endangered Light-footed Clapper Rail (Rallus longirostrus levipes), in Estero Puerto Bando, based on the damage seen to the subspecies (R. l. oboletus) in San Francisco Bay (Torchin et al. 2005). | |||||
| NEP-VI | Pt. Conception to Southern Baja California | Ecological Impact | Competition | ||
| Based on the very high biomass seen in Estero de Punta Banda (4 X that of the next most abundant and native species, Tagelus spp.), competition for phytoplankton and other suspended food particles is likely (Torchin et al. 2005). | |||||
| NEP-V | Northern California to Mid Channel Islands | Ecological Impact | Food/Prey | ||
| Geukensia demissa comprised 57% of the diet of the endangered California Clapper Rail (Rallus longirostris obsoletus) (Moffitt 1941, cited by Cohen and Carlton 1995). | |||||
| P090 | San Francisco Bay | Ecological Impact | Food/Prey | ||
| Geukensia demissa comprised 57% of the diet of the endangered California Clapper Rail (Rallus longirostris obsoletus) (Moffitt 1941, cited by Cohen and Carlton 1995). | |||||
| CA | California | Ecological Impact | Food/Prey | ||
| Geukensia demissa comprised 57% of the diet of the endangered California Clapper Rail (Rallus longirostris obsoletus) (Moffitt 1941, cited by Cohen and Carlton 1995)., Geukensia demissa comprised 57% of the diet of the endangered California Clapper Rail (Rallus longirostris obsoletus) (Moffitt 1941, cited by Cohen and Carlton 1995). | |||||
| CA | California | Ecological Impact | Habitat Change | ||
| Closing shells can trap chicks and sever toes of adult endangered California Clapper Rails (Rallus longirostris obsoletus) in salt marshes (Carlton 1979; Cohen and Carlton 1995)., Closing shells can trap chicks and sever toes of adult endangered California Clapper Rails (Rallus longirostris obsoletus) in salt marshes (Carlton 1979; Cohen and Carlton 1995). | |||||
Regional Distribution Map
| Bioregion | Region Name | Year | Invasion Status | Population Status |
|---|---|---|---|---|
| NA-ET1 | Gulf of St. Lawrence to Bay of Fundy | 0 | Native | Established |
| NA-S3 | None | 0 | Native | Established |
| NA-ET2 | Bay of Fundy to Cape Cod | 0 | Native | Established |
| NA-ET3 | Cape Cod to Cape Hatteras | 0 | Native | Established |
| CAR-VII | Cape Hatteras to Mid-East Florida | 0 | Native | Established |
| NEP-V | Northern California to Mid Channel Islands | 1894 | Non-native | Established |
| NEP-VI | Pt. Conception to Southern Baja California | 1955 | Non-native | Established |
| CAR-III | None | 1994 | Non-native | Established |
| P040 | Newport Bay | 1955 | Non-native | Established |
| P050 | San Pedro Bay | 1968 | Non-native | Established |
| P090 | San Francisco Bay | 1894 | Non-native | Established |
| P110 | Tomales Bay | 2001 | Non-native | Established |
| P093 | _CDA_P093 (San Pablo Bay) | 1894 | Non-native | Established |
| P070 | Morro Bay | 1986 | Non-native | Unknown |
| P029 | _CDA_P029 (Newport Bay) | 1944 | Non-native | Established |
| P058 | _CDA_P058 (San Pedro Channel Islands) | 2011 | Non-native | Unknown |
Occurrence Map
| OCC_ID | Author | Year | Date | Locality | Status | Latitude | Longitude |
|---|---|---|---|---|---|---|---|
| 7876 | Carlton 1992 | 1997 | 1979-01-01 | Bolsa Chica Lagoon | Non-native | 33.6922 | -118.0398 |
| 7877 | Torchin et al. 2005 | 1985 | 1985-01-01 | Estero de Punta Banda | Non-native | 31.7500 | -116.6167 |
| 7878 | Romero et al. 2003 | 2002 | 2002-01-01 | Lake Maracaibo | Non-native | 10.9000 | -71.8000 |
| 7879 | Baez et al. 2005) | 2001 | 2001-01-01 | El Mojan | Non-native | 10.9167 | -71.7500 |
| 7880 | Bousfield 1960 | None | 9999-01-01 | Chaleur Bay | Native | 48.0000 | -66.0000 |
| 7881 | Bousfield 1960) | None | 9999-01-01 | Cape Breton Island | Native | 46.0000 | -61.5000 |
| 7882 | Academy of Natural Sciences of Philadelphia 2003 | None | 9999-01-01 | Charlottetown | Native | 46.2400 | -63.1399 |
| 7883 | Academy of Natural Sciences of Philadelphia 2003 | None | 9999-01-01 | Random Island | Native | 48.1167 | -53.7333 |
| 7884 | Bousfield 1960 | None | 9999-01-01 | St. Marys Bay | Native | 44.4167 | -66.1000 |
| 7889 | Bousfield 1960 | None | 9999-01-01 | Minas Basin | Native | 45.2500 | -64.1667 |
| 7890 | U.S. National Museum of Natural History 2012) | None | 9999-01-01 | Glen Haven, SW Of Halifax | Native | 44.5833 | -64.0000 |
| 7891 | U.S. National Museum of Natural History 2012 | None | 9999-01-01 | Bluff Hill Cove | Native | 41.3845 | -71.5012 |
| 7892 | U.S. National Museum of Natural History 2012 | None | 9999-01-01 | New Rochelle, Colony Beach Club | Native | 40.9115 | -73.7824 |
| 7893 | U.S. National Museum of Natural History 2012 | None | 9999-01-01 | Lewes, At Henlopen Flats | Native | 38.8032 | -75.0946 |
| 7894 | U.S. National Museum of Natural History 2012 | None | 9999-01-01 | Lockwoods Folly Inlet | Native | 33.9200 | -78.2300 |
| 7895 | U.S. National Museum of Natural History 2012 | None | 9999-01-01 | off Georgia | Native | 31.3933 | -80.8867 |
| 7896 | U.S. National Museum of Natural History 2012 | None | 9999-01-01 | Off Florida | Non-native | 25.7561 | -83.7036 |
| 7897 | Academy of Natural Sciences oif Philadelphia 2012 | None | 9999-01-01 | Woodland Beach | Native | 39.3334 | -75.4746 |
| 7898 | Academy of Natural Sciences of Philadelphia | None | 9999-01-01 | Benedict | Native | 38.5333 | -76.7167 |
| 7899 | Academy of Natural Sciences of Philadelphia 2012 | None | 9999-01-01 | Brigantine Island | Native | 39.4833 | -74.3333 |
| 7900 | Academy of Natural Sciences of Philadelphia 2012 | None | 9999-01-01 | Saint Augustine | Native | 29.7000 | -81.2167 |
| 7901 | Yale Peabody Museum 2012 | None | 9999-01-01 | Oyster Creek | Native | 44.0987 | -69.4920 |
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