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Concurrent habitat and life history influences on effective/census population size ratios in stream-dwelling trout

Title:

Concurrent habitat and life history influences on effective/census population size ratios in stream-dwelling trout

Belmar-Lucero, Sebastian and Wood, Jacquelyn L. A. and Scott, Sherylyne and Harbicht, Andrew B. and Hutchings, Jeffrey A. and Fraser, Dylan J. (2012) Concurrent habitat and life history influences on effective/census population size ratios in stream-dwelling trout. Ecology and Evolution, 2 (3). pp. 562-573. ISSN 20457758

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Official URL: http://dx.doi.org/10.1002/ece3.196

Abstract

Lower effective sizes (Ne) than census sizes (N) are routinely documented in natural populations, but knowledge of how multiple factors interact to lower Ne/N ratios is often limited. We show how combined habitat and life-history influences drive a 2.4- to 6.1-fold difference in Ne/N ratios between two pristine brook trout (Salvelinus fontinalis) populations occupying streams separated by only 750 m. Local habitat features, particularly drainage area and stream depth, govern trout biomass produced in each stream. They also generate higher trout densities in the shallower stream by favoring smaller body size and earlier age-at-maturity. The combination of higher densities and reduced breeding site availability in the shallower stream likely leads to more competition among breeding trout, which results in greater variance in individual reproductive success and a greater reduction in Ne relative to N. A similar disparity between juvenile or adult densities and breeding habitat availability is reported for other species and hence may also result in divergent Ne/N ratios elsewhere. These divergent Ne/N ratios between adjacent populations are also an instructive reminder for species conservation programs that genetic and demographic parameters may differ dramatically within species.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Belmar-Lucero, Sebastian and Wood, Jacquelyn L. A. and Scott, Sherylyne and Harbicht, Andrew B. and Hutchings, Jeffrey A. and Fraser, Dylan J.
Journal or Publication:Ecology and Evolution
Date:2012
Funders:
  • Concordia Open Access Author Fund
ID Code:973708
Deposited By:ANDREA MURRAY
Deposited On:28 Mar 2012 15:29
Last Modified:29 Mar 2012 11:17
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