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    Optimal bioeconomic management of changing marine resources

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    Moberg_thesis.pdf (6.150Mb)
    Date
    2016-09
    Author
    Moberg, Emily A.  Concept link
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    Citable URI
    https://hdl.handle.net/1912/8412
    DOI
    10.1575/1912/8412
    Keyword
     Marine habitat conservation; Saltwater fishing 
    Abstract
    Marine populations are increasingly subjected to changing conditions whether through harvest or through broad-scale habitat change. Historically, few models have accounted for such trends over time, and even fewer have been used to study how trends affect optimal harvests. I developed and analyzed several models that explore, first, endogenous change caused by harvest and, second, exogenous change from factors (such as rising ocean temperatures) outside harvesters' control. In these models, I characterized the profit{or yield{maximizing strategy when harvesting damages habitat in a multispecies fishery, when harvest creates a selective pressure on dispersal, and when rising temperatures cause changes in vital rates. I explore this last case in both deterministic and stochastic environments, and also allow the harvester to learn about unknown parameters of the stock recruitment model while harvesting. I also develop an unambiguous definition of and describe a statistical test for a shift in a species' spatial distribution. My results demonstrate that optimal harvesting strategies in a changing environment differ in important ways from optimal strategies in a constant environment.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2016
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    • Biology
    • WHOI Theses
    Suggested Citation
    Thesis: Moberg, Emily A., "Optimal bioeconomic management of changing marine resources", 2016-09, DOI:10.1575/1912/8412, https://hdl.handle.net/1912/8412
     

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