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- Title
Life history strategies, population regulation, and implications for fisheries management.
- Authors
Winemiller, Kirk O.
- Abstract
Life history theories attempt to explain the evolution of organism traits as adaptations to environmental variation. A model involving three primary life history strategies (endpoints on a triangular surface) describes general patterns of variation more comprehensively than schemes that examine single traits or merely contrast fast versus slow life histories. It provides a general means to predict a priori the types of populations with high or low demographic resilience, production potential, and conformity to density-dependent regulation. Periodic (long-lived, high fecundity, high recruitment variation) and opportunistic (small, short-lived, high reproductive effort, high demographic resilience) strategies should conform poorly to models that assume density-dependent recruitment. Periodic-type species reveal greatest recruitment variation and compensatory reserve, but with poor conformity to stock–recruitment models. Equilibrium-type populations (low fecundity, large egg size, parental care) should conform better to assumptions of density-dependent recruitment, but have lower demographic resilience. The model's predictions are explored relative to sustainable harvest, endangered species conservation, supplemental stocking, and transferability of ecological indices. When detailed information is lacking, species ordination according to the triangular model provides qualitative guidance for management and development of more detailed predictive models.
- Subjects
FISHERY management; FISH habitat improvement; ENDANGERED species; NATURE conservation; WILDLIFE conservation; LIFE history theory
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2005, Vol 62, Issue 4, p872
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F05-040