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Life-history traits of Brown Trout vary with the size of small streams

  1. B. Jonsson1,†,
  2. N. Jonsson1,
  3. E. Brodtkorb2,‡,
  4. P.-J. Ingebrigtsen3

Article first published online: 20 DEC 2001

DOI: 10.1046/j.1365-2435.2001.00528.x

Issue

Functional Ecology

Functional Ecology

Volume 15, Issue 3, pages 310–317, June 2001

Additional Information

How to Cite

Jonsson, B., Jonsson, N., Brodtkorb, E. and Ingebrigtsen, P.-J. (2001), Life-history traits of Brown Trout vary with the size of small streams. Functional Ecology, 15: 310–317. doi: 10.1046/j.1365-2435.2001.00528.x

Author Information

  1. 1

    Norwegian Institute for Nature Research, Dronningensgt. 13, P.O.Box 736 Sentrum, N-0105 Oslo, Norway;

  2. 2

    Zoological Institute, Norwegian University of Technology, N-7034 Trondheim, Norway, and

  3. 3

    Norwegian University of Agriculture, Department of Biology and Nature Management, N-1432 Ås, Norway

    Author to whom correspondence should be addressed. E-mail: §Present address: Statkraft Engineering AS, N-1322 Høvik, Norway.

Publication History

  1. Issue published online: 20 DEC 2001
  2. Article first published online: 20 DEC 2001

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Keywords:

  • Maturation;
  • migration;
  • residency;
  • Salmo trutta;
  • smolting

Summary

  • 1
     Brown Trout Salmo trutta L. life-history traits were studied in 17 coastal streams with mean annual water discharges ≤1 m3 s−1, and with anadromous and freshwater resident trout present in all streams.
  • 2
     Mean smolt length and age were positively correlated with mean annual water discharge and latitude. The variation (CV) in smolt length and age was negatively correlated with water discharge. Mean length and age at maturity were also positively correlated with mean annual water discharge.
  • 3
     Freshwater resident females were sparse (mean: 3·7%) but males were abundant in all the investigated populations (mean 48·9%). Mean body length at maturity of resident males increased with discharge in parallel to that of the anadromous males. Mean length at maturity increased with smolt length in anadromous males, but not females. Mean sea-age at maturity in females, but not males, was negatively correlated with smolt age.
  • 4
     It is concluded that several life-history traits of Brown Trout are strongly influenced by habitat variables associated with the size of small nursery streams.
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