Metapopulation and source/sink concepts were used to assess
the performance of oyster restoration via a network of no-take reserves
in Pamlico Sound (PS), NC, the second largest estuary in the US. We
parameterized a spatially-explicit, stage-based matrix metapopulation
model with empirical measures of oyster demographic rates (fecundity,
settlement, growth, survival) within reserves and larval connectivity
(hydrodynamic and particle-tracking larval dispersal simulations) among
reserves to determine: (1) the relative contribution of each reserve to
the network (λc), and (2) the potential for reserves to persist
or increase as a network connected by dispersal (i.e., λ ≥
1). Mean oyster density increased by 432% during the 3-year field
study, and oyster growth and survival rates were relatively high
compared to other systems; however, the overall metapopulation (network)
was not self-sustaining (λ = 0.52). The metapopulation model
then identified (3) rapid increases in λ with increasing oyster
restoration, and (4) that building many small reserves woiuld increase
λ more rapidly than building several large reserves. Lastly, a
GIS framework prioritized oyster restoration sites located in the
northeast and southwest portions of Pamlico Sound in accord with the
major wind and larvel dispersion axes for Pamlico Sound. The
metapopulation and GIS framework applied in this study: (1) identifies
reserves that had different demographic "strengths", thereby justifying
different management goals for these reserves, and (2) is guiding an
overall oyster restoration strategy in space.
Dr. David Eggleston earned a B.S. in Biology from Old Dominion University, and a M.A. in Marine Ecology and a Ph.D. in Fisheries Ecology from The College of William and Mary. Dr. Eggleston is a Professor of Marine Ecology and Conservation in the Department of Marine, Earth, and Atmospheric Sciences at North Carolina State University, as well as the Director of the Center for Marine Science and Technology at North Carolina State University. His research interests include marine conservation biology, experimental marine benthic ecology, detecting ecological impacts, fisheries and behavioral ecology, population dynamics and modeling, estuarine and coastal habitat restoration, and marine science education.
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