Buffan-Dubau, E. Université Bordeaux 1 - CNRS - UMR 5805, e.buffan-dubau@biocean.u-bordeaux.fr
Carman, K. Louisiana State University, zocarm@lsu.edu

 
DIEL PATTERNS OF MEIOFAUNA FEEDING ON MICROALGAE IN A LOUISIANA SALT MARSH.
 
We examined diel feeding on microalgae (MA) by three meiobenthic copepods (Coullana sp., Microarthridion littorale, and Pseudostenhelia wellsi) and ostracods over two 24-h cycles. Based on HPLC analysis of MA pigments, planktonic (high proportion of cyanobacteria) and benthic (dominated by diatoms) MA communities were distinctly different. HPLC analysis of Coullana gut contents indicated that it fed extensively, but selectively, on plankton. Both HPLC analysis of gut pigments and grazing rates based on 14C-labeled algae indicated strong diel patterns in Coullana sp., M. littorale, and ostracods; feeding activity peaked during mid day, and coincided with peaks of MA biomass. Our data are consistent with a functional response by meiofauna to MA availability, and support the hypothesis that meiofaunal grazing may have an important influence on MA biomass.
 
Day: Friday, Feb. 5
Time: 12:00 - 12:15pm
Location: Eldorado Hotel
 
Code: SS46FR1200E