Invasion
Invasion Description
1st Record: Vancouver Island/British Columbia/Barkley Sound (1998, Introduced, Established, Fisheries and Oceans Canada 2000; Yamada and Gillespie 2008). Crabs collected in 2008-2009 in Barkley Sound had a high frequency of large, green colored crabs, characteristic of crabs in early intermolt, suggestive of a population still undergrowing rapid growth, in comparison with a native population in Anglesey, Wales (McGaw et al. 2011).
Geographic Extent
Annette Island, Meetakatla Indian Community, Ketchikan area/AK/Bostwick Inlet-Frontal Nichols Passage (7/22/2022, Miller 2022, 55.1288° N, 131.5745° W,); Goose Island, Haida Gwai/British Columbia/Pacific Ocean (Carolyn Prentice, i-Naturalist 2020, , 51.925305Lon: -128.470978);Hayden Turner Campground in Daajing Giids, Haida Gwaii/British Columbia/Skidegate Inlet, Queen Charlotte Sound (Gall 2020, 53.251298, -132.116714); (Columbia/Victoria/British/Columbia/Esquimalt Harbor (Straits of Juan de Fuca) (1999, single record, Fisheries and Oceans Canada 2000; Yamada and Gillespie 2008); Tofino (Vancouver Island)/British Columbia/Clayuquot Sound (1999, Introduced, Established, Fisheries and Oceans Canada 2000; Yamada and Gillespie 2008); Vancouver Island/British Columbia/Barkley Sound (1998, Introduced, Established, Fisheries and Oceans Canada 2000; Yamada and Gillespie 2008); Bligh Island/British Columbia/Nootka Sound (2000, ICES Committee on the Marine Environment 2004; Yamada and Gillespie 2008); Vancouver Island/British Columbia/Little Espinosa Inlet (2001, 3 specimens, ICES Committee on the Marine Environment 2004; Yamada and Gillespie 2008); Port Eliza/British Columbia/Esperanza Inlet (2002, ICES Committee on the Marine Environment 2004; Yamada and Gillespie 2008); Klitsis Beach/British Columbia/Little Espinosa Inlet (ICES Committee on the Marine Environment 2004; Yamada and Gillespie 2008); Brooks Bay,Vancouver Island, British Columbia/Klaskino Inlet (2007, Klassen and Locke 2007); Winter Harbour, Vancouver Island/British Columbia/Quatisino Sound (2007, Klassen and Locke 2007); San Juan Island/WA/Westcott Harbor (8/30/2016, Yamada et al. 2017, 1 specimen); WA/Padilla Bay (9/2016, Yamada et al. 2016, 4 specimens); Dungeness Spit/WA/Juan de Fuca Strait (4/26/2017, University of Washington 2017. 48.168604,-123.1394); Lummi Nation Seafood Hatchery/Lummi Bay (2021, Associated Press 2021)
Vectors
Level | Vector |
---|---|
Alternate | Ballast Water |
Alternate | Discarded Bait |
Alternate | Natural Dispersal |
Regional Impacts
Ecological Impact | Habitat Change | |
In enclosure experiments, in Barkely Sound, Briitsh Columbia, high densities of Green Crabs resulted in rapid declines of Eelgrass (Zostera marina density (Howard et al. 2019). | ||
Ecological Impact | Herbivory | |
In experiments, in Barkely Sound, Briitsh Columbia, Green Crabs shredded Eelgrass blades, but also directly consumed rhizomes (Howard et al. 2019). | ||
Ecological Impact | Competition | |
In experiments, Green Crabs showed a type II feeding response, while native Red Rock Crabs (Cancer productus) have a type III response, meaning that Green Crabs feed at a higher rate on Pacific Oysters (Magallana gigas) at low prey densites (Ens et a.1. 2021). | ||