NOAA Office of Science and Technology, 2013. SAV Program monitors and restores bay grasses. Composition, abundance, biomass and production of macrofauna in a New England estuary: Comparisons among eelgrass meadows and other nursery habitats. Marine Ecology Progress Series, 1990, 65: 1-14. Variations in structure of estuarine fish communities in relation to abundance of submersed vascular plants. Journal of Environmental Economics and Management, 1985, 12: 246-263. Economic losses associated with the degradation of an ecosystem: the case of submerged aquatic vegetation in Chesapeake Bay. Using a model that assumes an essential relationship, we find that SAV has a significant positive impact on blue crab productivity (p0.05). Our results indicate that a model that incorrectly assumes that habitat is essential to a species can result in model misspecification and biased estimates of the impact of habitat on species productivity. An empirical bioeconomic model that allows for all three possible relationships was estimated and two alternative approaches were used to test whether SAV matters for the crab stock. A habitat can be essential to a species (the species is driven to extinction without it), facultative (more habitat means more of the species, but species can exist at some level without any of the habitat) or irrelevant (more habitat is not associated with more of the species). This paper investigates habitat-fisheries interaction between two important resources in the Chesapeake Bay: blue crabs and submerged aquatic vegetation (SAV).
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