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Meeting yield and conservation objectives by harvesting both juveniles and adults
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.ORCID iD: 0000-0003-4040-8142
Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics. College of Mathematics and System Science, Shandong University of Science and Technology, Qingdao, China.ORCID iD: 0000-0002-6553-9686
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Department of Mathematics and Mathematical Statistics.
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2019 (English)In: American Naturalist, ISSN 0003-0147, E-ISSN 1537-5323, Vol. 193, no 3, p. 373-390Article in journal (Refereed) Published
Abstract [en]

Sustainable yields that are at least 80% of the maximum sustainable yield are sometimes referred to as "pretty good yields" (PGY). The range of PGY harvesting strategies is generally broad and thus leaves room to account for additional objectives besides high yield. Here, we analyze stage-dependent harvesting strategies that realize PGY with conservation as a second objective. We show that (1) PGY harvesting strategies can give large conservation benefits and (2) equal harvesting rates of juveniles and adults is often a good strategy. These conclusions are based on trade-off curves between yield and four measures of conservation that form in two established population models, one age-structured model and one stage-structured model, when considering different harvesting rates of juveniles and adults. These conclusions hold for a broad range of parameter settings, although our investigation of robustness also reveals that (3) predictions of the age-structured model are more sensitive to variations in parameter values than those of the stage-structured model. Finally, we find that (4) measures of stability that are often quite difficult to assess in the field (e.g., basic reproduction ratio and resilience) are systematically negatively correlated with impacts on biomass and size structure, so that these later quantities can provide integrative signals to detect possible collapses.

Place, publisher, year, edition, pages
University of Chicago Press, 2019. Vol. 193, no 3, p. 373-390
Keywords [en]
fisheries management, maximum sustainable yield, pretty good yield, Pareto front, resilience, size structure
National Category
Ecology Evolutionary Biology
Identifiers
URN: urn:nbn:se:umu:diva-155571DOI: 10.1086/701631ISI: 000459624900007PubMedID: 30794450OAI: oai:DiVA.org:umu-155571DiVA, id: diva2:1281600
Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2019-04-01Bibliographically approved

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Lundström, Niklas L. P.Meng, XinzhuBodin, MatsBrännström, Åke

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Lundström, Niklas L. P.Meng, XinzhuBodin, MatsBrännström, Åke
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