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JPR Advance Access originally published online on June 10, 2005
Journal of Plankton Research 2005 27(7):715-718; doi:10.1093/plankt/fbi036
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Published by Oxford University Press 2005.

SHORT COMMUNICATION

Viable gut passage of cyanobacteria through the filter-feeding fish Atlantic menhaden, Brevoortia tyrannus

Kevin D. Friedland1,*, Dean W. Ahrenholz2 and Leonard W. Haas3

1 UMASS/NOAA Cooperative Marine Education and Research Program, Blaisdell House, University of Massachusetts, Amherst, MA 01003, USA; 2 National Marine Fisheries Service, Beaufort Laboratory, Beaufort, NC 28516, USA and 3 Virginia Institute of Marine Science, Gloucester Point, VA 23062, USA

* Corresponding Author: kevin.friedland{at}noaa.gov

Received April 11, 2004; accepted in principle May 20, 2005; accepted for publication May 31, 2005; published online June 10, 2005
Communicating editor: K.J. Flynn

We examined the contents of the alimentary tract of juvenile Atlantic menhaden, an obligate filter-feeding fish, with epifluoresence microscopy. All plankton taxa and detrital material observed in plankton samples from the sampling area could also be found in the esophagus of the fish. The corresponding plankton taxa were absent from the pre-feces sampled in the hindgut with the exception of cyanobacteria, which were found intact and fluorescing as they do in nature. The survival of cyanobacteria during gut passage and their presence in menhaden feces may enhance both nutrient availability and the delivery of these cells to the benthos. Additionally, diatoms frustules were found in the pre-feces, which may affect the sequestration of biogenic silica. These results may have bearing on the formation of cyanobacteria blooms, nutrient flow in estuaries and the delivery of material to the sediment.


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