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Collapse and recovery of forage fish populations prior to commercial exploitation
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2017
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Source: Geophysical Research Letters, 44(4), 1877-1885
[PDF-567.12 KB]
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Journal Title:Geophysical Research Letters
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Description:We use a new,well-calibrated 500 year paleorecordoff southern California todetermine collapsefrequency,crosscorrelation,persistence,andreturntimesofexploitedforagefishpopulations.Thepaleorecordshowsthat“collapse”(definedas <10%ofthemeanpeakbiomass)isanormalstaterepeatedly experiencedbynorthernanchovy,Pacifichake,andPacificsardinewhichwerecollapsed29–40%ofthe time,priortocommercialfishingexploitation.Mean( ±SD)persistenceof“fishablebiomass”(definedasone thirdmeanpeakbiomassfromthepaleorecord)was 19±18,15±17,and12±7yearsforanchovy,hake,and sardine.Meanreturntimestothesamebiomasswas8yearsforanchovybut22yearsforsardineandhake.
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Source:Geophysical Research Letters, 44(4), 1877-1885
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:CC0 Public Domain
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Rights Statement:This article is a U.S. Government work and is in the public domain in the USA.
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