@article {83147, title = {Status of the European Green Crab, Carcinus maenas, (aka 5-spine crab) in Oregon Estuaries. Report for 2022}, year = {2023}, note = {The invasive European green crab is a voracious predator of bivalve molluscs, small crustaceans and other organisms. It has been present in Oregon since the late 1990s. The population grows when winter waters are warm, as they are during El Ni{\~n}os. Since 2015, however, {\textquotedblleft}recruitment has been good every year. Since green crabs live for 6 years, these recent strong year classes can produce larvae until 2027. . . Now that populations in Oregon, Washington and British Columbia have built up, we have evidence for local production and for larvae sources from a genetically distinct population on Vancouver Island. . .{\textquotedblright} (from the Executive Summary) }, pages = {30 p.}, institution = {Pacific States Marine Fisheries Commission. Aquatic Nuisance Species Project}, address = {Portland, Or.}, keywords = {aquatic invertebrates, Coos Bay, crustaceans, El Nino, European green crab = Carcinus maenas, Grays Harbor (Wa.), introduced species, Netarts Bay, Pacific Decadal Oscillation, population count, Salmon River, Siuslaw River, Tillamook Bay, Umpqua River estuary, Willapa Bay (Wa.), Yaquina Bay}, url = {https://ir.library.oregonstate.edu/concern/technical_reports/73666d40c}, author = {Yamada, Sylvia Behrens and Royer, Cameron and Schooler, Shon and Flitcroft, Rebecca and Vance, Mitch and Randall, Andrea and Fisher, Jennifer} } @article {83146, title = {Status of the European Green Crab, Carcinus maenas, in Oregon and Washington Coastal Estuaries. Report for 2020 and 2021}, year = {2022}, note = {The COVID-19 pandemic affected this report, leading to combined years and trapping on a reduced number of estuaries. The invasive European green crab is a voracious predator of bivalve molluscs, small crustaceans and other organisms. It has been present in Oregon since the late 1990s. The population grows when winter waters are warm, as they are during El Ni{\~n}os. Since 2015, however, {\textquotedblleft}recruitment has been good every year. Since green crabs live for 6 years, these recent strong year classes can produce larvae until 2027. . . Now that populations in Oregon, Washington and British Columbia have built up, we have evidence for local production and for larvae sources from a genetically distinct population on Vancouver Island. . .{\textquotedblright} (from the Executive Summary) This report is accompanied by a dataset, available at: https://ir.library.oregonstate.edu/concern/datasets/b8515w17z }, pages = {27 p.}, institution = {Pacific States Marine Fisheries Commission. Aquatic Nuisance Species Project}, address = {Portland, Or.}, keywords = {aquatic invertebrates, Coos Bay, crustaceans, El Nino, European green crab = Carcinus maenas, Grays Harbor (Wa.), introduced species, Netarts Bay, Pacific Decadal Oscillation, population count, Tillamook Bay, Willapa Bay (Wa.), Yaquina Bay}, url = {https://ir.library.oregonstate.edu/concern/technical_reports/g445cn70c }, author = {Yamada, Sylvia Behrens and Royer, Cameron and Schooler, Shon and Fisher, Jennifer and Randall, Andrea and Buffington, Chelsey and Stote, Alex and Akmajian, Adrianne} } @article {83115, title = {Relationship between ocean ecosystem indicators and year class strength of the invasive European green crab (Carcinus maenas)}, journal = {Progress in Oceanography}, volume = {196}, number = {102618}, year = {2021}, note = {The link between invasive European green crab populations on the American west coast and warm oceanic conditions is well established. This article closely examines the link between ocean climate and these crab populations and probes aspects of this population{\textquoteright}s increase.}, month = {2021, Aug.}, pages = {8 p.}, keywords = {California Current, Coos Bay, Davidson current, El Nino, European green crab = Carcinus maenas, Grays Harbor, introduced species, mathematical modeling, Netarts Bay, Pacific Decadal Oscillation, population biology, Tillamook Bay, water temperature, Willapa Bay, Yaquina Bay}, doi = {https://doi.org/10.1016/j.pocean.2021.102618 }, author = {Yamada, Sylvia Behrens and Fisher, Jennifer L. and Kosro, P. Michael} } @article {82861, title = {Status of the European Green Crab, Carcinus maenas, in Oregon and Washington coastal Estuaries in 2017}, year = {2018}, note = {The invasive European green crab is a voracious predator of bivalve molluscs, small crustaceans and other organisms. It has been present in Oregon since the late 1990s. The population grows when winter waters are warm, as they are during El Ni{\~n}os. {\textquotedblleft}Prior to 2015, green crabs were too rare to exert measurable effects on the native benthic community and on shellfish culture in Oregon and Washington. Following the recent strong El Ni{\~n}o, however, we documented the arrival of three strong year classes in 2015, 2016 and 2017. Average catch rates in over the last three years steadily increased from 0.5 to 0.8 and to 1.9 crabs per trap. These catches are much higher than in any of the previous years, including 1998. Since green crabs live for 6 years, these three consecutive year classes will provide larvae until 2023. A switch to cooler ocean conditions in the coming years will result in poor recruitment, but a return to high PDO and strong El Ni{\~n}o patterns would signal good recruitment and higher green crab densities.{\textquotedblright} (from the Executive Summary) Coos Bay, in particular, has experienced shocking growth of this population, going from 9 crabs captured in 2002 to 1,653 crabs captured in 2017. This report is accompanied by a dataset, available at: https://ir.library.oregonstate.edu/concern/datasets/rn3016632 }, pages = {29 p.}, institution = {Pacific States Marine Fisheries Commission. Aquatic Nuisance Species Project}, keywords = {Alsea Bay, aquatic invertebrates, Boat ramp (Netarts), Coos Bay, Coquille River estuary, crustaceans, El Nino, European green crab = Carcinus maenas, Grays Harbor (Wa.), Hatfield Marine Science Center, introduced species, Johnson{\textquoteright}s Slough (Yaquina), Makah Bay (Wa.), Nehalem Bay, Netarts Bay, North of Nevor Shellfish (Netarts), Oregon Coast Aquarium mudflat, Pacific Decadal Oscillation, population count, Sally{\textquoteright}s Bend, Tillamook Bay, Whiskey Creek Salmon Hatchery, Willapa Bay (Wa.), Yaquina Bay}, url = {https://ir.library.oregonstate.edu/concern/technical_reports/rx913w156 }, author = {Yamada, Sylvia Behrens and Yednock, Bree and Indivero, Julia and Geierman, Christina and Prickett, Joel A. and Randall, Andrea and Akmajian, Adrianne} } @article {77101, title = {Thermogeographic variation in body size of Carcinus maenas, the European green crab}, journal = {Marine Biology}, volume = {162}, year = {2015}, note = {For many ectotherms, or {\textquotedblleft}cold-blooded{\textquotedblright} animals, a warmer environment leads to a smaller body size, and these animals grow larger in cooler temperatures. {\textquotedblleft}Here, we test whether biogeographic differences in size (carapace width) exist for a recent invasion of the non-native European green crab, Carcinus maenas, along the west coast of North America. . . Forces that shape the phenotypic trajectory of species may play an important role in both invasion dynamics and subsequent ecological impacts.{\textquotedblright} (from the Abstract)}, pages = {p.1625{\textendash}1635}, keywords = {aquatic invertebrates, Bodega Bay, Coos Bay, crustaceans, decapods, Elkhorn Slough, European green crab = Carcinus maenas, Gales Passage, introduced species, Netarts Bay, phenology, Pipestem Inlet, San Francisco Bay, Seadrift Lagoon, temperature, Tillamook Bay, Tomales Bay, Yaquina Bay}, doi = {https://doi.org/10.1007/s00227-015-2698-5}, author = {Kelley, Amanda L. and de Rivera, Catherine E. and Grosholz, Edwin D. and Ruiz, Gregory M. and Yamada, Sylvia Behrens and Gillespie, Graham} } @article {34421, title = {Linking ocean conditions to year class strength of the invasive European green crab, Carcinus maenas}, journal = {Biological Invasions}, volume = {12}, number = {6}, year = {2010}, note = {The authors correlate recruitment strength in the introduced European green crab in the Pacific Northwest with certain prevailing ocean conditions. "Once a non-native species arrives and survives in an area, its long-term persistence depends on its recruitment success. If conditions are not favorable for recruitment it will ultimately disappear. . . . Right now, green crabs are still too rare to exert a measurable effect on the native benthic community and on shellfish culture in Oregon and Washington. However, if their numbers were to increase, we would be able to predict the arrival of strong year classes from ocean conditions and alert managers and shellfish growers of possible increases in predation pressure from this invader. " [from the article abstract]}, pages = {p.1791-1804}, keywords = {Coos Bay, European green crab = Carcinus maenas, introduced species, Netarts Bay, Tillamook Bay, Yaquina Bay}, doi = {10.1007/s10530-009-9589-y}, author = {Yamada, Sylvia Behrens and Kosro, P. Michael} } @article {34251, title = {Will the European green crab (Carcinus maenas) persist in the Pacific Northwest?}, journal = {ICES Journal of Marine Science: Journal du Conseil}, volume = {65}, number = {5}, year = {2008}, note = {After the strong 1997/1998 El Nino, young green crabs appeared in several West Coast estuaries. The question is: would European green crabs maintain viable populations in their new environments once ocean conditions became less favorable to their survival? This paper reports on a study of European green crabs during their first ten years in the Pacific Northwest. Their populations declined as the 1997/1998 El Nino ebbed and less favorable conditions resumed. The downward trend was reversed in 2005 and 2006, however, and it now seems likely that "if winters remain mild and green crabs continue to recruit well, it is highly likely that they will spread to northern British Columbia and Alaska."}, pages = {p.725-729}, keywords = {Coos Bay, El Nino, European green crab = Carcinus maenas, Grays Harbor, invasive species, Netarts Bay, Tillamook Bay, Willapa Bay, Yaquina Bay}, doi = {10.1093/icesjms/fsm191}, author = {Yamada, Sylvia Behrens and Gillespie, Graham E.} } @book {83266, title = {Global invader: the European green crab}, series = {ORESU-B}, volume = {no.01-001}, year = {2001}, note = { An excellent look at what was known about the European green crab early in its invasion of Oregon waters. Includes color photographs of Oregon crabs to aid in identification.}, pages = {123 p.}, publisher = {Oregon Sea Grant, Oregon State University }, organization = {Oregon Sea Grant, Oregon State University }, address = {Corvallis, Or.}, keywords = {aquatic invertebrates, crustaceans, decapods, European green crab = Carcinus maenus, introduced species, predation}, url = {https://repository.library.noaa.gov/view/noaa/44992 }, author = {Yamada, Sylvia Behrens and Office of Sea Grant and Extramural Programs. and Oregon State University Sea Grant College Program.} }