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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) |
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| Authors: | Karen Bersine Valance E. F. Brenneis Robyn C. Draheim A. Michelle Wargo Rub Jeannette E. Zamon Rodney K. Litton Susan A. Hinton Mark D. Sytsma Jeffery R. Cordell John W. Chapman | ||
| Affiliation: | 1. Clatsop Community College Fisheries Intern Program, NOAA Fisheries—Point Adams Research Station, P.O. Box 155, Hammond, OR, 97121, USA 2. Department of Environmental Science & Policy, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA 3. Center for Lakes and Reservoirs, Portland State University, Portland, OR, 97207, USA 4. NOAA Fisheries—Point Adams Research Station, P.O. Box 155, Hammond, OR, 97121, USA 5. Clatsop County Fisheries, 2001 Marine Drive – Room 253, Astoria, OR, 97103, USA 6. School of Aquatic and Fisheries Sciences, University of Washington, P.O. Box 355080, Seattle, WA, 98195, USA 7. Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Dr., Newport, OR, 97365, USA |
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| Abstract: | Estuaries play an important role as nurseries and migration corridors for Chinook salmon and other fishes. The invasive New Zealand mudsnail, Potamopyrgus antipodarum (Gray, 1843), has been noted in the Columbia River Estuary and other estuaries in the western USA, yet no studies have addressed the estuarine impacts of this invader. Our data show P. antipodarum is currently found in five peripheral bays and many tributaries of the Columbia River Estuary, where it can constitute a major portion of the benthic invertebrate biomass and where it co-occurs with native amphipod species. We review the history of the P. antipodarum invasion in the Columbia River Estuary and discuss potential impacts on estuarine food webs. We also report the first occurrence of P. antipodarum in the diet of juvenile Chinook salmon from the Columbia River Estuary. Although present in Chinook diets at very low frequencies, our observations of P. antipodarum in Chinook gut contents may represent early stages of food web change due to the establishment of dense estuarine snail populations. Additional research is needed to determine the effects of P. antipodarum on benthic resources, native benthic invertebrates, and benthic predators. We encourage biologists working in western USA estuaries to be alert to the possibility of encountering P. antipodarum in benthic habitats and predator diets.
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| Keywords: | Benthic invertebrate Chinook salmon Columbia River Diet Estuary Food web Invasive species New Zealand mudsnail Oncorhynchus tshawytscha Potamopyrgus antipodarum | ||
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