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Stability of swimming performance and activity hierarchies among wild largemouth bass at multiple temporal scales: evidence for context-dependent shuffling between seasons

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Laboratory-based studies of locomotory performance in many taxa have noted that individuals form stable hierarchies of organismal performance. Though laboratory studies of teleost fishes have consistently demonstrated individual repeatability of swimming performance, this phenomenon has rarely been studied in the field and never across multiple years. Using a whole-lake acoustic telemetry array with submetre accuracy, we assessed the individual repeatability of two metrics of swimming performance (daily distance traveled and mean daily swimming speed) within four seasons during a year (fall, winter, spring, and summer), among these seasons, and between winters of 2 years. Largemouth bass (Micropterus salmoides (Lacepède, 1802)) formed stable performance hierarchies within seasons except spring and no sex-specific differences in rankings were noted. Individual swimming performance was not repeatable among seasons during 1 year or across multiple winters. Seasonal changes in environmental and intrinsic biological conditions appear to result in a reshuffling of performance hierarchies, perhaps reflecting individual differences in organismal physiology.

Les études en laboratoire de la performance locomotrice chez de nombreux taxons indiquent que les individus forment des hiérarchies stables de performances organismiques. Bien que les études de laboratoire chez les poissons téléostéens montrent de façon constante la répétabilité de la performance de nage, le phénomène a rarement été étudié en nature et jamais sur plusieurs années. À l’aide d’un réseau de télémétrie acoustique couvrant un lac entier et ayant une précision de moins de 1 m, nous avons évalué la répétabilité individuelle de deux métriques de la performance de nage (la distance du déplacement quotidien et la vitesse moyenne journalière de nage) durant les quatre saisons (automne, hiver, printemps et été) d’une année, ainsi qu’entre les saisons et entre les hivers de 2 années différentes. Les achigan à grande bouche (Micropterus salmoides (Lacepède, 1802)) forment des hiérarchies stables de performance au cours de chacune des saisons, à l’exception du printemps et il n’existe pas de différences spécifiques au sexe dans les classements. La performance individuelle de nage n’est pas répétable d’une saison à l’autre durant une même année, ni au cours de plusieurs hivers. Les changements saisonniers des conditions environnementales et biologiques intrinsèques semblent produire un remaniement des hiérarchies des performances, ce qui reflète peut-être des différences individuelles de physiologie organismique.

Document Type: Research Article

Publication date: 2010-03-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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