Zooplankton community composition and copepod grazing on the West Florida Shelf in relation to blooms of Karenia brevis |
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| Institution: | 1. Environmental Research Institute, North Highland College, University of the Highlands and Islands, Thurso KW14 7EE, UK;2. Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, UK;3. NEODAAS-Plymouth, Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK;1. National Marine Fisheries Service, Northeast Fisheries Science Center, 28 Tarzwell Dr., Narragansett, RI 02882, USA;2. Gulf Coast Research Laboratory, University of Southern Mississippi, 703 East Beach Drive, Ocean Springs, MS 39564, USA;3. NOAA Geophysical Fluid Dynamics Laboratory, Princeton University Forrestal Campus, 201 Forrestal Road, Princeton, NJ 08540, USA;4. Princeton University, Program in Atmospheric and Oceanic Sciences, 300 Forrestal Road, Princeton, NJ 08540, USA;5. Department of Biology, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;6. National Marine Fisheries Service, Northeast Fisheries Science Center, 166 Water Street, Woods Hole, MA 02543, USA;7. National Marine Fisheries Service, Northeast Fisheries Science Center, c/o NOAA Geophysical Fluid Dynamics Laboratory, 201 Forrestal Road, Princeton University Forrestal Campus, Princeton, NJ 08540, USA;1. Biology Department, University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02747, USA;2. School for Marine Science and Technology, University of Massachusetts Dartmouth, 706 South Rodney French Boulevard, New Bedford, MA 02744, USA;1. Rutgers, The State University of New Jersey, Institute of Marine and Coastal Sciences, 71 Dudley Road, New Brunswick, NJ 08901, USA;2. Mote Marine Laboratory, 1600 Ken Thompson Parkway, Sarasota, FL 34236, USA;3. Virginia Institute of Marine Science, College of William & Mary, P.O. Box 1346, Gloucester Point, VA 23062, USA;1. Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, 4600 Elkhorn Avenue, Norfolk, VA 23529, USA;2. Fish and Wildlife Research Institute, Florida Fish and Wildlife Conservation Commission, St. Petersburg, FL, USA;3. Horn Point Laboratory, University of Maryland, Cambridge, MD 21613, USA;4. Department of Physical Sciences, The College of William & Mary, Virginia Institute of Marine Science, Gloucester Point, VA 23062, USA |
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| Abstract: | Blooms of the toxin producing dinoflagellate Karenia brevis occur routinely on the West Florida Shelf of the Gulf of Mexico. Nutrient supplies are thought to play a large role in the formation and maintenance of these blooms. The role of top-down control has been less well studied, but grazing, or the lack thereof, on these toxic species may also enhance the formation of large biomass blooms in this region. Zooplankton community structure and copepod species composition were analyzed from samples collected on the West Florida Shelf (WFS) during a NOAA funded ECOHAB regional Karenia Nutrient Dynamics project during October 2007–2010. In 2008 there was no statistical difference in the abundance of zooplankton at bloom and non-bloom stations, however in 2009 there was a statistically significant difference (p < 0.05) between the abundance of zooplankton at stations with Karenia present. To investigate copepod ingestion rates in relation to K. brevis, shipboard and laboratory experiments of the single label method of 14C labeled phytoplankton culture, and time course ingestion experiments with isolated copepods were performed. Calculated ingestion rates suggest that the copepod species Centropages velificatus, and Acartia tonsa ingested K. brevis, however rates were variable among collection sites and K. brevis strains. Parvocalanus crassirostris did not ingest K. brevis in any of the experiments. |
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| Keywords: | ECOHAB Harmful algal blooms West Florida Shelf Zooplankton |
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