{"71930":{"#nid":"71930","#data":{"type":"news","title":"Tiny Tropical Crab Invades Georgia Oyster Reefs","body":[{"value":"\u003Cp\u003EA dime-sized tropical crab that has invaded coastal waters in the Southeast United States is having both positive and negative effects on oyster reefs, leaving researchers unable to predict what the creature\u0027s long-term impact will be.\u003C\/p\u003E\n\u003Cp\u003EUnlike native crabs that eat baby oysters, mussels and fish, the green porcelain crab \u003Cem\u003EPetrolisthes armatus \u003C\/em\u003Eis a filter feeder, extracting its food from the water much as oysters do.  The fast-reproducing invader therefore isn\u0027t directly attacking oyster populations, though it may be competing with them for food - and may impact the predators that normally attack the oysters.\n\u003C\/p\u003E\n\u003Cp\u003EResearchers at the Georgia Institute of Technology have spent more than three years studying the effects of the crab, and are reporting their findings in the journal \u003Cem\u003EBiological Invasions\u003C\/em\u003E.  The research, believed to be the first to document effects of the crab on oyster and mussel populations off the Southeast coast, was supported by the U.S. Environmental Protection Agency, the National Oceanic and Atmospheric Administration, and the Harry and Linda Teasley Endowment to Georgia Tech.\n\u003C\/p\u003E\n\u003Cp\u003E\u0022We\u0027re seeing opposing effects from these crabs,\u0022 said Mark Hay, a professor in Georgia Tech\u0027s School of Biology.  \u0022They are probably having more impact on the ecosystem by being prey than by being predators.  Other members of the ecosystem are feeding on them, and that is changing the rate at which fish and other crabs are feeding on the native species.\u0022\n\u003C\/p\u003E\n\u003Cp\u003EThe impact of the crabs is important because oysters are a \u0027foundation species\u0027 essential to the health of coastal ecosystems because their reefs provide homes to dozens of other creatures.\n\u003C\/p\u003E\n\u003Cp\u003E\u0022These non-native crabs slow the rate of growth for organisms like oysters that they compete with, but they enhance the ability of those same organisms to survive when young,\u0022 Hay noted.  \u0022They are probably competing with the oysters for food, but the native crabs have switched to eating these green porcelain crabs rather than eating the baby oysters.  Even though their growth is suppressed, the baby oysters are not being attacked as much now by the native consumers.\u0022\n\u003C\/p\u003E\n\u003Cp\u003EThough the crabs aren\u0027t killing existing populations of oysters, their long-term impact could still be significant.  For instance, Hay noted, their availability as food could potentially increase the population of native crabs, disrupting the delicate balance between those predators and the oysters.\n\u003C\/p\u003E\n\u003Cp\u003EBut assessing the long-term impact of the crabs has been difficult because the creatures reproduce and grow rapidly, flooding the shallow coastal waters with their young.  In research conducted off Skidaway Island and Sapelo Island on the Georgia coast, the researchers found \u0027extraordinarily high\u0027 populations of the crab - as many as 11,000 individuals per square meter.\n\u003C\/p\u003E\n\u003Cp\u003ETo assess the impacts of the non-native crab population, graduate student Amanda Hollebone placed oysters and mussels into large baskets and located them on mud flats away from existing oyster reefs.  Some of the baskets contained only oysters and mussels and were intended to serve as controls, some had a community of oysters, mussels, oyster drills and native mud crabs, while others had the same community spiked with non-native crabs.  The distance from the existing oyster reefs was expected to prevent adult green porcelain crabs from reaching the baskets.\n\u003C\/p\u003E\n\u003Cp\u003EHowever, the researchers found that within a month, the control baskets also had large populations of the green porcelain crabs that had reached the containers as juveniles settling from the water column.  Entry of the crabs to the control baskets interfered with the researchers\u0027 ability to compare the traits of communities with and without the non-native crabs.  \n\u003C\/p\u003E\n\u003Cp\u003E\u0022You get a true understanding of the sheer densities of these crabs only when you actually pick up or dig through clumps of oysters and oyster shell hash,\u0022 said Hollebone, who is now a temporary assistant professor at Georgia Southern University in Statesboro.  \u0022Particularly in the summer months, I was never able to find a patch of oysters in the Savannah area that did not have the green porcelain crab.\u0022\n\u003C\/p\u003E\n\u003Cp\u003EBecause the green porcelain crabs quickly took over the control baskets, the researchers only had valid comparison data for 4-6 weeks.  However, information from their baskets supported the observations made under more controlled - but less natural - conditions at Georgia Tech\u0027s laboratory at the Skidaway Institute of Oceanography near Savannah.\n\u003C\/p\u003E\n\u003Cp\u003EAs in the lab experiments, the researchers found that the crabs slowed the growth of small oysters, but not small mussels -- another common filter-feeder.  \n\u003C\/p\u003E\n\u003Cp\u003EThe long-term effects of the massive crab population are difficult to predict.  Their large numbers could lead to population growth among the native crabs and fish that now prefer eating them instead of their normal diet.  But if the predator population should grow large enough to control the non-native crabs, that could lead to a decline in their numbers - and force the predators back to their traditional prey of oysters and mussels.\n\u003C\/p\u003E\n\u003Cp\u003E\u0022We\u0027re not sure what\u0027s going to happen,\u0022 Hay said.  \u0022We can\u0027t really raise the alarm because we don\u0027t have the data to say these crabs are doing something bad.  It\u0027s possible that they will not have a huge effect at all.\u0022\n\u003C\/p\u003E\n\u003Cp\u003ELong-term observation of the oyster reefs may ultimately provide answers.  \n\u003C\/p\u003E\n\u003Cp\u003E\u0022We have observed both positive and negative impacts on oysters and oyster-related biota at small scales, but we cannot definitively answer our concerns about oyster reefs at larger scales,\u0022 Hollebone added.  \u0022With continued monitoring of large expanses of reefs, we may begin to understand the long-term, large-scale effects.\u0022\n\u003C\/p\u003E\n\u003Cp\u003EThe green porcelain crabs were observed in Florida during 1990s, but have since appeared in large numbers in coastal waters of Georgia and South Carolina.  Researchers don\u0027t know if they hitched a ride northward in the ballast of ships, whether warming water temperatures encouraged a northerly migration - or both.  \n\u003C\/p\u003E\n\u003Cp\u003EThough not much is known about them in their native habitat, Hay said the crabs appear to be thriving in their new home.  Population densities observed in the South Atlantic Bight are as much as 37 times higher than the greatest densities reported in their native habitat.\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EResearch News \u0026amp; Publications Office\u003Cbr \/\u003E\nGeorgia Institute of Technology\u003Cbr \/\u003E\n75 Fifth Street, N.W., Suite 100\u003Cbr \/\u003E\nAtlanta, Georgia  30308  USA\u003C\/strong\u003E\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EMedia Relations contact\u003C\/strong\u003E: John Toon (404-894-6986); E-mail: (\u003Ca href=\u0022mailto:jtoon@gatech.edu\u0022\u003Ejtoon@gatech.edu\u003C\/a\u003E)\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ETechnical contact\u003C\/strong\u003E: Mark Hay (404-894-8429); E-mail: (\u003Ca href=\u0022mailto:mark.hay@biology.gatech.edu\u0022\u003Emark.hay@biology.gatech.edu\u003C\/a\u003E)\n\u003C\/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWriter\u003C\/strong\u003E: John Toon\n\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":[{"value":"Long-term impact of non-native species can\u0027t be predicted"}],"field_summary":[{"value":"A dime-sized tropical crab that has invaded coastal waters in the Southeast United States is having both positive and negative effects on oyster reefs, leaving researchers unable to predict what the creature\u0027s long-term impact will be.","format":"limited_html"}],"field_summary_sentence":[{"value":"Georgia oyster reefs threatened by tropical crab"}],"uid":"27303","created_gmt":"2007-09-05 00:00:00","changed_gmt":"2016-10-08 03:03:24","author":"John Toon","boilerplate_text":"","field_publication":"","field_article_url":"","dateline":{"date":"2007-09-05T00:00:00-04:00","iso_date":"2007-09-05T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"71931":{"id":"71931","type":"image","title":"Green porcelain crab","body":null,"created":"1449177414","gmt_created":"2015-12-03 21:16:54","changed":"1475894647","gmt_changed":"2016-10-08 02:44:07"},"71932":{"id":"71932","type":"image","title":"Gathering non-native crabs","body":null,"created":"1449177414","gmt_created":"2015-12-03 21:16:54","changed":"1475894647","gmt_changed":"2016-10-08 02:44:07"}},"media_ids":["71931","71932"],"related_links":[{"url":"http:\/\/www.biology.gatech.edu\/faculty\/mark-hay\/","title":"Mark Hay"},{"url":"http:\/\/www.biology.gatech.edu\/","title":"School of Biology"}],"groups":[{"id":"1188","name":"Research Horizons"}],"categories":[{"id":"154","name":"Environment"},{"id":"146","name":"Life Sciences and Biology"},{"id":"135","name":"Research"}],"keywords":[{"id":"7549","name":"crab"},{"id":"2987","name":"invasive"},{"id":"6758","name":"marine"},{"id":"6366","name":"oyster"},{"id":"7167","name":"reef"},{"id":"170856","name":"species"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cstrong\u003EJohn Toon\u003C\/strong\u003E\u003Cbr \/\u003EResearch News \u0026amp; Publications Office\u003Cbr \/\u003E\u003Ca href=\u0022http:\/\/www.gatech.edu\/contact\/index.html?id=jt7\u0022\u003EContact John Toon\u003C\/a\u003E\u003Cbr \/\u003E\u003Cstrong\u003E404-894-6986\u003C\/strong\u003E","format":"limited_html"}],"email":["jtoon@gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}