Effects of a Persistent Red Tide (<Emphasis Type="Italic">Karenia brevis</Emphasis>) Bloom on Community Structure and Species-Specific Relative Abundance of Nekton in a Gulf of Mexico Estuary |
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Authors: | Kerry E Flaherty Jan H Landsberg |
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Institution: | (1) Fish and Wildlife Research Institute, Florida Fish and Wildlife Conservation Commission, 100 Eighth Ave., S.E., St., Petersburg, FL 33701, USA |
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Abstract: | An unusually persistent red tide event caused by the ichthyotoxic dinoflagellate Karenia brevis occurred along the southwest Florida coast in 2005. Extensive fish kills led to concerns regarding the effect of red tide
on fish populations and their subsequent recruitment. Community structure differences were analyzed for all small- and large-bodied
nekton species collected by fisheries-independent monitoring from 1996 through 2006. Indices of abundance of five economically
important fish species were also calculated from this time period. A significant change in small- and large-bodied nekton
community structure was apparent from summer 2005 through spring 2006. Declines in the annual recruitment of juvenile spotted
seatrout (Cynoscion nebulosus), sand seatrout (Cynoscion arenarius), and red drum (Sciaenops ocellatus) were evident in 2005 and 2006. Species-specific subadult and adult abundances, however, were consistent with those of previous
years. These community shifts and species-specific declines appear to be associated with the red tide event. |
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