San Diego State University
Department of Biology
Fish Ecology Lab
Predation by fishes and trophic ecology in eelgrass beds (funded by the Port of San Diego; PADI Foundation; Southern California Academy of Sciences; SDSU Master's Program in Ecology)
Levi Lewis's thesis project --
Predators strongly influence community structure and the functioning of ecosystems.
The strength of such top-down effects have been investigated in several marine
ecosystems. For his research, Levi Lewis explored the effects
of microcarnivorous fishes on lower trophic levels in eelgrass
ecosystems within San Diego Bay. Specifically, Levi manipulated the abundance
fishes as predators in determining their effects on their invertebrate prey and
in turn, their
indirect effects on epiphytic algae and eelgrass (Zostera marina)
Levi's results suggest that fishes have a positive effect on seagrass growth by removing invertebrates that may reduce the photosynthetic
potential of eelgrass, opposite the prediction of fishes having a deleterious
effect on seagrasses based on previous research in other ecosystems.
This page was last modified on May 10, 2012.
SDSU Fish Ecology Lab
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