SuperUser Account Wednesday, April 30, 2014 / Categories: Research Headlines, Press Release, Climate, Ecosystems, Fisheries & Seafood, 2014 NOAA-led researchers discover ocean acidity is dissolving shells of tiny snails off West Coast A NOAA-led research team has found the first evidence that acidity of continental shelf waters off the West Coast is dissolving the shells of tiny free-swimming marine snails, called pteropods, which provide food for pink salmon, mackerel and herring, according to a new paper published in Proceedings of the Royal Society B. Researchers estimate that the percentage of pteropods in this region with dissolving shells due to ocean acidification has doubled in the nearshore habitat since the pre-industrial era and is on track to triple by 2050 when coastal waters become 70 percent more corrosive than in the pre-industrial era due to human-caused ocean acidification. The new research documents the movement of corrosive waters onto the continental shelf from April to September during the upwelling season, when winds bring water rich in carbon dioxide up from depths of about 400-600 feet to the surface and onto the continental shelf. "Our findings are the first evidence that a large fraction of the West Coast pteropod population is being affected by ocean acidification,” said Nina Bednarsek, Ph.D., of NOAA’s Pacific Marine Environmental Laboratory in Seattle, the lead author of the paper. “Dissolving coastal pteropod shells point to the need to study how acidification may be affecting the larger marine ecosystem. These nearshore waters provide essential habitat to a great diversity of marine species, including many economically important fish that support coastal economies and provide us with food. These graphs depict the increase in the monthly mean global atmospheric burden of methane as analyzed from measurements collected by NOAA's Global Greenhouse Gas Reference Network. Credit: NOAA Global Monitoring Laboratory. The term “ocean acidification” describes the process of ocean water becoming corrosive as a result of absorbing nearly a third of the carbon dioxide released into the atmosphere from human sources. This change in ocean chemistry is affecting marine life, particularly organisms with calcium carbonate skeletons or shells, such as corals, oysters, mussels, and small creatures in the early stages of the food chain such as pteropods. The pteropod is a free-swimming snail found in oceans around the world that grows to a size of about one-eighth to one-half inch. The research team, which also included scientists from NOAA’s Northwest Fisheries Science Center and Oregon State University, found that the highest percentage of sampled pteropods with dissolving shells were along a stretch of the continental shelf from northern Washington to central California, where 53 percent of pteropods sampled using a fine mesh net had severely dissolved shells. The ocean’s absorption of human-caused carbon dioxide emissions is also increasing the level of corrosive waters near the ocean’s surface where pteropods live. “We did not expect to see pteropods being affected to this extent in our coastal region for several decades,” said William Peterson, Ph.D., an oceanographer at NOAA’s Northwest Fisheries Science Center and one of the paper’s co-authors. “This study will help us as we compare these results with future observations to analyze how the chemical and physical processes of ocean acidification are affecting marine organisms.” Richard Feely, senior scientist from NOAA’s Pacific Marine Environmental Lab and co-author of the research article, said that more research is needed to study how corrosive waters may be affecting other species in the ecosystem. "We do know that organisms like oyster larvae and pteropods are affected by water enriched with CO2. The impacts on other species, such as other shellfish and larval or juvenile fish that have economic significance, are not yet fully understood." “Acidification of our oceans may impact marine ecosystems in a way that threatens the sustainability of the marine resources we depend on,” said Libby Jewett, Director of the NOAA Ocean Acidification Program. “Research on the progression and impacts of ocean acidification is vital to understanding the consequences of our burning of fossil fuels.” The research drew upon a West Coast survey by the NOAA Ocean Acidification Program in August 2011, that was conducted onboard the R/V Wecoma, owned by the National Science Foundation and operated by Oregon State University. NOAA's mission is to understand and predict changes in the Earth's environment, from the depths of the ocean to the surface of the sun, and to conserve and manage our coastal and marine resources. Join us on Twitter, Facebook and our other social media channels. 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For more information, please contact Monica Allen, director of public affairs for NOAA Research at 301-734-1123 or by email at firstname.lastname@example.org Previous Article NOAA expedition discovers ship’s timepiece silent for two centuries Next Article Greenhouse gases continued rising in 2013; 34 percent increase since 1990 Print 23869 Tags: climate ecosystems ocean acidification Documents to download Limacina helicina shell dissolution as an indicator of declining habitat suitability owing to ocean acidification in the California Current Ecosystem(.pdf, 0 B) - 3507 download(s) Proceedings of the Royal Academy B Related articles New research helps crack the mystery of clouds to improve climate prediction NOAA scientist Vaishali Naik plays a leading role in international climate assessment Human activities responsible for rapid increase in Earth's heat Preliminary analysis concludes Pacific Northwest heat wave was a 1,000-year event…hopefully Low-oxygen waters off Washington, Oregon coasts risk becoming large 'dead zones'