2026-09-19T07:07:10Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/575742022-01-13T21:54:42Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023

Michael G. Neubert. Moeller, Holly Villacorta Woods Hole Oceanographic Institution. Joint Program in Biological Oceanography. Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Biology 2010-08-26T17:32:30Z 2010-08-26T17:32:30Z 2010 2010 http://hdl.handle.net/1721.1/57574 654432982 Thesis (S.M.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2010. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Cataloged from student submitted PDF version of thesis. Includes bibliographical references (p. 125-127). In this thesis, I expand a spatially-explicit bioeconomic fishery model to include the negative effects of fishing effort on habitat quality. I consider two forms of effort driven habitat damage: First, fishing effort may directly increase individual mortality rates. Second, fishing effort may increase competition between individuals, thereby increasing density-dependent mortality rates. I then optimize effort distribution and fish stock density according to three management cases: (1) a sole owner, with jurisdiction over the entire fishery, who seeks to maximize profit by optimizing effort distribution; (2) a manager with limited control of effort and stock distributions, who seeks to maximize tax revenue by setting the length of a single, central reserve and a uniform tax per unit effort outside it; and (3) a manager with even more limited enforcement power, who can only set a tax per unit effort everywhere in the habitat space. I demonstrate that the economic efficiency of reserves depends upon model parameterization. In particular, reserves are most likely to increase profit (or tax revenue) when density-dependent fish mortality rates are affected. Interestingly, for large habitats that are sufficiently sensitive to density-dependent fish mortality effects, reserve networks (alternating fished and unshed areas of fixed periodicity) emerge. These results suggest that spatial forms of management which include marine reserves may enable signicant economic gains over nonspatial management strategies, in addition to the well-established conservation benefits provided by closed areas. by Holly Villacorta Moeller. S.M. 127 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Joint Program in Biological Oceanography. Biology. Woods Hole Oceanographic Institution. On the economic optimality of marine reserves when fishing damages habitat Thesis application/pdf Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="529f4eb2-bdd9-427b-afcb-2736ba0cdfa9"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>On the economic optimality of marine reserves when fishing damages habitat</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2010</PublicationDate> <Authors> <Author> <DisplayName>Moeller, Holly Villacorta</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Joint Program in Biological Oceanography.</Keyword> <Keyword>Biology.</Keyword> <Keyword>Woods Hole Oceanographic Institution.</Keyword> <Abstract>In this thesis, I expand a spatially-explicit bioeconomic fishery model to include the negative effects of fishing effort on habitat quality. I consider two forms of effort driven habitat damage: First, fishing effort may directly increase individual mortality rates. Second, fishing effort may increase competition between individuals, thereby increasing density-dependent mortality rates. I then optimize effort distribution and fish stock density according to three management cases: (1) a sole owner, with jurisdiction over the entire fishery, who seeks to maximize profit by optimizing effort distribution; (2) a manager with limited control of effort and stock distributions, who seeks to maximize tax revenue by setting the length of a single, central reserve and a uniform tax per unit effort outside it; and (3) a manager with even more limited enforcement power, who can only set a tax per unit effort everywhere in the habitat space. I demonstrate that the economic efficiency of reserves depends upon model parameterization. In particular, reserves are most likely to increase profit (or tax revenue) when density-dependent fish mortality rates are affected. Interestingly, for large habitats that are sufficiently sensitive to density-dependent fish mortality effects, reserve networks (alternating fished and unshed areas of fixed periodicity) emerge. These results suggest that spatial forms of management which include marine reserves may enable signicant economic gains over nonspatial management strategies, in addition to the well-established conservation benefits provided by closed areas.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>