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Intraspecific density dependence in the dynamics of zooplankton under hypertrophic conditions

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Intraspecific interactions may limit population growth of small cladoceran taxa under food-rich, hypertrophic conditions. Multiple-regression models significantly explained a large proportion of the variation in the body size adjusted fecundity and population growth rate of crustacean zooplankton taxa in a shallow, hypertrophic lake. The results of partial correlation analyses suggested exploitative competition to have only limited significance in determining the zooplankton dynamics. The analyses also revealed strong negative relationships between biomass and both body size adjusted fecundity and population growth rate within most taxa. Most of these relationships cannot be explained by food shortage or predation and suggest alternative mechanisms such as chemically mediated, intraspecific interference competition or life history shifts.

Les interactions intraspécifiques peuvent limiter la croissance de la population chez des taxons de cladocères de petite taille dans des conditions hypertrophiques de nourriture abondante. Des modèles de régression multiple expliquent de façon significative une importante proportion de la variation de la fécondité ajustée en fonction de la taille et du taux de croissance de la population chez des taxons de crustacés zooplanctoniques dans un lac hypertrophe peu profond. Les résultats d'analyses de corrélation partielle laissent croire que la compétition d'exploitation ne joue qu'un rôle limité dans la dynamique du zooplancton. Ces analyses démontrent aussi l'existence de fortes relations négatives entre la biomasse, d'une part, et la fécondité ajustée en fonction de la taille et le taux de croissance de la population, d'autre part, chez la plupart des taxons. La plupart de ces relations ne s'expliquent pas par une carence de nourriture ou par la prédation et il y a lieu de croire à l'existence de mécanismes de rechange, tels que la compétition d'interférence au moyen de substances chimiques ou les déphasages des cycles biologiques.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2003

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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