Size at hatching determines population dynamics and response to harvesting in cannibalistic fish

T. van Kooten, J. Andersson, P. Bystrom, L. Persson, A.M. Roos

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

Abstract

We hypothesize that size at hatching strongly affects population dynamics of cannibalistic fish species and is a crucial determinant of how populations respond to selective removal of large individuals (harvesting). We use a mechanistic mathematical model to study the relation between hatching size and response to harvesting mortality, using Eurasian perch (Perca fluviatilis) as a model organism. We show how hatching size determines dynamics through its effect on the relative strength of cannibalistic mortality and resource competition as mechanisms of population regulation. In populations with intermediate and large hatching size, cannibalistic mortality is an important determinant of population dynamics. and harvesting destabilizes population dynamics. When hatching size is small, population stability is less sensitive to this type of harvesting. Populations hatching at small size are regulated by competition, and harvesting large individuals affects such populations less. Harvesting can also induce the growth of very large individuals, absent in unharvested populations. Our results show that harvesting in cannibalistic lake fish populations can strongly alter Population dynamics in ways that can only be anticipated on the basis of mechanistic knowledge about how populations are regulated.
Original languageEnglish
Pages (from-to)401-416
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume67
Issue number2
DOIs
Publication statusPublished - 2010

Keywords

  • perch perca-fluviatilis
  • structured populations
  • eurasian perch
  • life-history
  • intracohort cannibalism
  • bioenergetics model
  • dependent predation
  • versatile technique
  • largemouth bass
  • competition

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