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Diel vertical migration in the Lake Superior pelagic community. II. Modeling trade-offs at an intermediate trophic level

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Abstract:

Several hypotheses have been proposed to explain diel vertical migration (DVM); however, they have generally been applied to DVM behavior of a single trophic level. We evaluate the costs (predation risk) and benefits (foraging rate and growth rate potential) of different hypothetical and observed DVM trajectories for a three-level pelagic food chain in Lake Superior containing opossum shrimp (Mysis relicta), deepwater ciscoes (Coregonus spp.), and lake trout (Salvelinus namaycush). Lake trout appear to be maximizing foraging and growth rates by tracking vertically migrating ciscoes, while the DVM trajectories of ciscoes suggests a trade-off between predation risk and growth. For ciscoes, two alternative DVM trajectories both minimize the ratio of risk to growth: a shallow trajectory that follows low light levels down to 80 m during the day and a deep trajectory (below 150 m) that tracks highest Mysis densities. Observed cisco DVM trajectories appear to follow the shallow high risk – high growth trajectory in 2001, but switch to the deep, low risk – low growth trajectory in 2004 when lake trout density was higher and the density of ciscoes was lower.

Plusieurs hypothèses cherchent à expliquer les migrations verticales journalières (DVM); elles ont, cependant, généralement été appliquées au comportement DVM d'un seul niveau trophique. Nous évaluons les coûts (risque de prédation) et les bénéfices (taux potentiels d'alimentation et de croissance) de différentes trajectoires DVM hypothétiques et réelles dans une chaîne alimentaire pélagique à trois échelons au lac Supérieur comprenant la crevette opossum (Mysis relicta), des ciscos d'eau profonde (Coregonus spp.) et le touladi (Salvelinus namaycush). Le touladi semble maximiser ses taux d'alimentation et de croissance en poursuivant les ciscos en migration verticale, alors que les trajectoires DVM des ciscos semblent refléter un compromis entre le risque de prédation et la croissance. Chez les ciscos, deux trajectoires DVM de rechange permettent toutes deux de minimiser le rapport du risque de prédation sur la croissance, une trajectoire peu profonde qui suit les faibles intensités lumineuses pendant le jour jusqu'à une profondeur de 80 m et une trajectoire profonde (sous 150 m) qui suit les densités maximales de Mysis. Les trajectoires DVM observées chez les ciscos en 2001 semblent avoir suivi le type de trajectoire plus superficielle de risque élevé et de croissance rapide. En 2004 quand les densités de touladis étaient plus fortes et celles des ciscos réduites, les ciscos ont adopté plutôt la trajectoire de risque faible et de croissance lente.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: October 1, 2006

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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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