Document: ALA-3-82-6

Are marine reserves for fisheries and for biodiversity compatible?

HASTINGS, A.* and L.W.BOTSFORD

University of California, Davis CA 95616 USA ¹

Abstract:
Using a modeling approach, we compare and contrast the design of networks of marine reserves for two different, commonly stated goals: (1) Maintaining high yield in fisheries and (2) conserving biodiversity, in an idealized setting using simple models. The models, which are simplifications of discrete-time continuous-space models, describe larval dispersal over a system of evenly spaced reserves of equal size. We initially demonstrate that since populations in reserve systems can be sustained either by covering a minimal fraction of the coast with small reserves or by covering a smaller fraction of the coast with few large reserves, cost considerations dictate the conservation goal would be best met by reserves as large as practically possible. In contrast, the fisheries goal of maximizing yield requires maximizing larval export outside or reserves, which we show means that reserves should be as small as practically possible. Meeting the fisheries goal is ultimately more costly because it suggests a larger area of the coastline should be in reserves, but it also improves on conservation goals by enhancing sustainability for species dispersing longer distances.

Keywords: Marine reserves, biodiversity, fishing

This abstract is being presented at: 11:00 AM in session:
Oral Session #57: Ocean-Going Fish and Mammals.