[MARMAM] New paper: Brevetoxins in dolphin prey fish

Spencer Fire Spencer.Fire at noaa.gov
Wed Oct 15 12:45:50 PDT 2008


Dear Colleagues:

The following paper is now available at
http://www.int-res.com/abstracts/meps/v368/

Fire SE, Flewelling LJ, Naar J, Twiner MJ, Henry MS, Pierce RH, Gannon DP,
Wang Z, Davidson L, Wells RS (2008).  PREVALENCE OF BREVETOXINS IN PREY FISH
OF BOTTLENOSE DOLPHINS IN SARASOTA BAY, FLORIDA.  Marine Ecology Progress
Series 368:283-294.  

ABSTRACT:
Blooms of the brevetoxin-producing dinoflagellate Karenia brevis have been
linked to high mortality of bottlenose dolphins Tursiops truncatus on
Florida's Gulf of Mexico coast. A clear understanding of trophic transfer of
brevetoxin from its algal source up the food web to top predators is needed
to assess exposure of affected dolphin populations. Prey fish constitute a
means of accumulating and transferring brevetoxins and are potential vectors
of brevetoxin to dolphins frequently exposed to K. brevis blooms. Here we
report results of brevetoxin analyses of the primary fish species consumed
by long-term resident bottlenose dolphins inhabiting Sarasota Bay, Florida.
Fish collected during K. brevis blooms in 2003 to 2006 were analyzed by
competitive enzyme-linked immunosorbent assay (ELISA) and had brevetoxin
concentrations ranging from 4 to 10 844 ng PbTx-3 eq g-1 tissue. Receptor
binding assay (RBA) and liquid chromatography-mass spectrometry (LC-MS)
analysis confirmed toxicity and the presence of parent brevetoxins and known
metabolites. Fish collected in the absence of K. brevis blooms tested
positive for brevetoxin by ELISA and RBA, with concentrations up to 1500 ng
PbTx-3 eq g-1 tissue. These findings implicate prey fish exposed to K.
brevis blooms as brevetoxin vectors for their dolphin predators and provide
a critical analysis of persistent brevetoxin loads in the food web of
dolphins repeatedly exposed to Florida red tides.

For more information, please contact me at spencer.fire at noaa.gov

Sincerely,

Spencer E. Fire, Ph.D.
Marine Biotoxins Program
Center for Coastal Environmental Health and Biomolecular Research
NOAA/National Ocean Service
219 Fort Johnson Road
Charleston, SC 29412

Tel:  843.762.8574
Fax:  843.762.8700
Email:  spencer.fire at noaa.gov




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