|
|
 EMBARGOED BY BIOLOGY LETTERSFOR RELEASE ON Tuesday, May 8, 2012 04:01 PM PDTTuesday, May 8, 2012 Plastic Trash Altering Ocean Habitats, Scripps Study Shows Sharp increase of small plastic debris in the 'Garbage Patch' could have ecosystem-wide consequences Scripps Institution of Oceanography / University of California, San Diego A 100-fold upsurge in human-produced plastic garbage in the ocean is altering habitats in the marine environment, according to a new study led by a graduate student researcher at Scripps Institution of Oceanography at UC San Diego.In 2009 an ambitious group of graduate students led the Scripps Environmental Accumulation of Plastic Expedition (SEAPLEX) to the North Pacific Ocean Subtropical Gyre aboard the Scripps research vessel New Horizon. During the voyage the researchers, who concentrated their studies a thousand miles west of California, documented an alarming amount of human-generated trash, mostly broken down bits of plastic the size of a fingernail floating across thousands of miles of open ocean.  LEFT: Examples of a not-yet-hatched sea skater (Halobates sericeus) egg (top), about the size of a grain of rice, and a hatched egg (bottom). Photo credit: Miriam Goldstein, Scripps Institution of Oceanography at UC San Diego. RIGHT: SEAPLEX researchers collected an alarming amount of small bits of broken down plastic floating across thousands of miles of open ocean. Photo credit: Scripps Institution of Oceanography at UC San Diego At the time the researchers didn't have a clear idea of how such trash might be impacting the ocean environment, but a new study published in the May 9 online issue of the journal Biology Letters reveals that plastic debris in the area popularly known as the "Great Pacific Garbage Patch" has increased by 100 times over in the past 40 years, leading to changes in the natural habitat of animals such as the marine insect Halobates sericeus. These "sea skaters" or "water striders"-relatives of pond water skaters-inhabit water surfaces and lay their eggs on flotsam (floating objects). Naturally existing surfaces for their eggs include, for example: seashells, seabird feathers, tar lumps and pumice. In the new study researchers found that sea skaters have exploited the influx of plastic garbage as new surfaces for their eggs. This has led to a rise in the insect's egg densities in the North Pacific Subtropical Gyre. Such an increase, documented for the first time in a marine invertebrate (animal without a backbone) in the open ocean, may have consequences for animals across the marine food web, such as crabs that prey on sea skaters and their eggs.  Miriam Goldstein of Scripps Oceanography. Photo credit: Chang Shu. The new study follows a report published last year by Scripps researchers in the journal Marine Ecology Progress Series showing that nine percent of the fish collected during SEAPLEX contained plastic waste in their stomachs. That study estimated that fish in the intermediate ocean depths of the North Pacific Ocean ingest plastic at a rate of roughly 12,000 to 24,000 tons per year. The Goldstein et al. study compared changes in small plastic abundance between 1972-1987 and 1999-2010 by using historical samples from the Scripps Pelagic Invertebrate Collection and data from SEAPLEX, a NOAA Ship Okeanos Explorer cruise in 2010, information from the Algalita Marine Research Foundation as well as various published papers.  During SEAPLEX, sea skaters and plastic trash were collected with a fine-meshed net called a "manta net," seen here being deployed from R/V New Horizon by Miriam Goldstein and Mario Aguilera. Photo credit: J. Leichter, Scripps Institution of Oceanography at UC San Diego "Plastic only became widespread in late '40s and early '50s, but now everyone uses it and over a 40-year range we've seen a dramatic increase in ocean plastic," said Goldstein. "Historically we have not been very good at stopping plastic from getting into the ocean so hopefully in the future we can do better." Coauthors of the study include Marci Rosenberg, a student at UCLA, and Scripps Research Biologist Emeritus Lanna Cheng. Funding for SEAPLEX was provided by the University of California Ship Funds, an innovative program that allows a new generation of scientists to gain valuable scientific training at sea, Project Kaisei/Ocean Voyages Institute, the Association for Women in Science-San Diego and the National Science Foundation's (NSF) Integrative Graduate Education and Research Traineeship program. The NOAA Okeanos Explorer Program (2010 Always Exploring expedition) and National Marine Fisheries Service provided support for the 2010 samples. Other study support was provided by Jim and Kris McMillan, Jeffrey and Marcy Krinsk, Lyn and Norman Lear, Ellis Wyer and an anonymous donor. Other support was provided by the California Current Ecosystem (CCE) program, part of NSF's Long-Term Ecological Research (LTER) program.  Microplastic concentrations in 1972-1987 (a and b) and 1999-2010 (c and d) based on new data (SEAPLEX, NOAA Ship Okeanos Explorer cruises), Algalita Marine Research Foundation as well as published data based on Wong et al (1974), Shaw (1977), Day & Shaw (1987), Gilfillan et al (2009) and Doyle et al (2011). # # # Note to broadcast and cable producers: University of California, San Diego provides an on-campus satellite uplink facility for live or pre-recorded television interviews. Please phone or e-mail the media contact listed above to arrange an interview.
About Scripps Institution of Oceanography |
|
