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The Potential for Spatial Distribution Indices to Signal Thresholds in Marine Fish Biomass

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  • Emilie Reuchlin-Hugenholtz
  • Nancy L Shackell
  • Jeffrey A Hutchings

Abstract

The frequently observed positive relationship between fish population abundance and spatial distribution suggests that changes in distribution can be indicative of trends in abundance. If contractions in spatial distribution precede declines in spawning stock biomass (SSB), spatial distribution reference points could complement the SSB reference points that are commonly used in marine conservation biology and fisheries management. When relevant spatial distribution information is integrated into fisheries management and recovery plans, risks and uncertainties associated with a plan based solely on the SSB criterion would be reduced. To assess the added value of spatial distribution data, we examine the relationship between SSB and four metrics of spatial distribution intended to reflect changes in population range, concentration, and density for 10 demersal populations (9 species) inhabiting the Scotian Shelf, Northwest Atlantic. Our primary purpose is to assess their potential to serve as indices of SSB, using fisheries independent survey data. We find that metrics of density offer the best correlate of spawner biomass. A decline in the frequency of encountering high density areas is associated with, and in a few cases preceded by, rapid declines in SSB in 6 of 10 populations. Density-based indices have considerable potential to serve both as an indicator of SSB and as spatially based reference points in fisheries management.

Suggested Citation

  • Emilie Reuchlin-Hugenholtz & Nancy L Shackell & Jeffrey A Hutchings, 2015. "The Potential for Spatial Distribution Indices to Signal Thresholds in Marine Fish Biomass," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-22, March.
    • Handle: RePEc:plo:pone00:0120500
    DOI: 10.1371/journal.pone.0120500
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    References listed on IDEAS

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    1. Robert J. Wilson & Chris D. Thomas & Richard Fox & David B. Roy & William E. Kunin, 2004. "Spatial patterns in species distributions reveal biodiversity change," Nature, Nature, vol. 432(7015), pages 393-396, November.
    2. Daniel E. Schindler & Ray Hilborn & Brandon Chasco & Christopher P. Boatright & Thomas P. Quinn & Lauren A. Rogers & Michael S. Webster, 2010. "Population diversity and the portfolio effect in an exploited species," Nature, Nature, vol. 465(7298), pages 609-612, June.
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