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Phenotypic responses of lacustrine brook charr in relation to the intensity of interspecific competition

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Abstract

We investigated the structure of interindividual variations in the diet of brook charr (Salvelinus fontinalis) based on stomach contents data of 3776 charr captured in 69 lakes of the Canadian Shield (Québec, Canada); 29 of these contained allopatric brook charr populations, 24 contained brook charr and creek chub (Semotilus atromaculatus) and 16 contained brook charr and white sucker (Catostomus commersoni). In any given lake, some of the charr fed almost exclusively on benthic organisms (‘benthic specialists’, i.e., mean percent weight of benthic prey >90%), others, almost exclusively on pelagic prey (‘pelagic specialists’, i.e., mean percent weight of benthic prey <10%), and a lesser proportion were ‘generalist feeders’ (i.e. mean percent weight of benthic prey between 10 and 90%). The proportion of benthic and pelagic specialists were respectively 41.3 and 18% in allopatric brook charr populations. These proportions fit remarkably well with those based on interindividual preferences in spatial distribution, identified through radio-telemetry in another study done in two lakes of the same area. The proportion of benthic specialists was related to competition for benthic organisms with creek chub and white sucker. The effect of white sucker on brook charr diet was more pronounced than that of creek chub: the proportion of benthic specialists among brook charr decreased from 41.3% in allopatry to 19.7% in sympatry with creek chub, and to 9.9% in sympatry with white sucker. Other response variables of brook charr populations also indicate that white sucker is a stronger competitor than creek chub in this system. Because sucker and chub were introduced in these lakes during the last century, phenotypic responses of brook charr to interspecific competition appear to be rapid. Furthermore, in addition to providing a strong field support to the current hypothesis that polymorphism is promoted by arelaxation of interspecific competition, our results also indicate that phenotypic response of brook charr (i.e. the proportion of each form in a given lake) is related to the intensity of this competition.

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Authors and Affiliations

  1. Département de chimie-biologie, Université du Québec à Trois-Rivières, C.P. 500, Trois-Rivières, Québec, Canada, G9A 5H7

    Philippe Bourke & Pierre Magnan

  2. Département de biologie et des sciences de la santé, Université du Québec à Rimouski, C.P. 3300, Rimouski, Québec, Canada, G5L 3A1

    Marco A. Rodríguez

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Bourke, P., Magnan, P. & Rodríguez, M.A. Phenotypic responses of lacustrine brook charr in relation to the intensity of interspecific competition. Evolutionary Ecology 13, 19–31 (1999). https://doi.org/10.1023/A:1006530029418

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