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A temporally stable spatial pattern in the spawner density of a freshwater fish: evidence for an ideal despotic distribution.
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- Author(s): Purchase, Craig F.; Hutchings, Jeffrey A.
- Source:
Canadian Journal of Fisheries & Aquatic Sciences; Mar2008, Vol. 65 Issue 3, p382-388, 7p, 1 Chart, 4 Graphs, 1 Map- Subject Terms:
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- Abstract: We explore the causal basis for a temporally stable spatial pattern in the density of spawning individuals of a freshwater fish. Based on a comparatively long-term set of data spanning one decade, reproductively active brook trout (Salvelinus fontinalis) inhabiting a near-pristine river on Cape Race, southeastern Newfoundland, occupy areas of either high or low density. Compared with their low-density counterparts, high-density aggregations are typically more than 30 times denser despite occupying only 4% of the available habitat. High-density areas are characterized by slower flow and suspected groundwater or bog-water seepage, attributes likely to increase the probability of offspring survival in Freshwater River. Disparity in density between high- and low-density aggregations declined as total population size increased, a pattern consistent with the predictions of the ideal free distribution. The larger body sizes of trout in the high-density aggregations may prevent others from occupying the most preferred spawning habitat. This spatial pattern in spawner density is consistent with that predicted by an ideal despotic distribution, although we cannot discount the influence that Allee effects might have on the distributional patterns of spawning individuals at low population sizes. [ABSTRACT FROM AUTHOR]
- Abstract: Nous explorons chez un poisson d’eau douce les bases causales d’un patron spatial temporairement stable dans la densité des individus au moment de la fraye. D’après un ensemble de données à relativement long terme prélevées au cours d’une décennie, les ombles de fontaine (Salvelinus fontinalis) en reproduction active dans une rivière quasiment à l’état sauvage à Cape Race, sud-est de Terre-Neuve, se retrouvent dans des zones ou de forte ou de faible densité. Par comparaison avec les rassemblements de faible densité, les rassemblements plus denses ont typiquement une densité plus de 30 fois plus élevée, alors qu’ils occupent seulement 4 % de l’habitat disponible. Les zones de forte densité se caractérisent par un débit plus faible et des infiltrations présumées d’eau souterraine ou d’eau de tourbière, des caractéristiques susceptibles d’améliorer la survie des rejetons dans la rivière Freshwater. La disparité entre les densités des rassemblements de forte et de faible densité diminue à mesure que la population augmente, un patron compatible avec les prédictions de la distribution libre idéale. Les tailles corporelles plus grandes des ombles dans les rassemblements de forte densité peuvent empêcher les autres poissons d’occuper les habitats les plus recherchés pour la fraye. Ce patron spatial de densité des reproducteurs est compatible avec les prédictions de la distribution idéale despotique, bien que nous soyons obligés de prendre aussi en considération l’influence que pourraient exercer les effets d’Allee sur les patrons de répartition des individus qui frayent aux faibles densités de population. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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