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The effects of temperature on prey-capture kinematics of the bluegill (Lepomis macrochirus): implications for feeding studies

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Abstract:

Research with ectothermic organisms has demonstrated that temperature is positively correlated with an individual's power output during locomotion. This study investigates the effect of temperature on another aspect of power output, prey-capture kinematics, of the bluegill (Lepomis macrochirus Rafinesque, 1819). Feeding sequences for two treatments of four sunfish were filmed at three temperatures (18, 24, and 30 °C) with one treatment (A) experiencing an increasing range of temperatures and the other (B) experiencing a decreasing temperature range. Directional temperatures affected prey-capture kinematics. The time required to achieve maximum lower jaw depression and maximum gape, as well as the duration of maximum gape, time to close the mouth (from the point of maximum gape), and the total bite duration, increased as water temperature decreased. In addition, both the time to maximum gape and the time to maximum lower jaw depression were longer at 18 °C for individuals in treatment A than those in treatment B. These results indicate that water temperature can bias the results of feeding studies employing kinematics that do not control for its effects as well as those that make comparisons across such studies which utilize different temperatures and taxa.

La recherche sur les organismes ectothermes a démontré qu'il existe une corrélation entre la température d'un individu et son rendement de puissance durant la locomotion. Notre étude examine l'effet de la température sur un autre aspect du rendement de puissance, la cinématique de la capture des proies, chez le crapet arlequin (Lepomis macrochirus Rafinesque, 1819). Nous avons filmé des séquences de quatre crapets en train de s'alimenter dans deux conditions et à trois températures (18, 24 et 30 °C); les conditions sont (A) une gamme de températures croissantes et (B) une gamme de températures décroissantes. Le sens du changement de température affecte la cinématique de la capture des proies. Le temps nécessaire pour obtenir la dépression maximale de la mâchoire inférieure et l'ouverture maximale de la bouche, ainsi que la durée de l'ouverture maximale, le temps nécessaire pour fermer la bouche (depuis le moment d'ouverture maximale) et la durée totale de la morsure, augmentent à mesure que la température de l'eau décroît. De plus, le temps requis pour l'ouverture maximale de la bouche et la dépression maximale de la mâchoire inférieure est plus long à 18 °C chez les individus soumis aux conditions A que chez ceux soumis aux conditions B. Ces résultats indiquent que la température de l'eau peut fausser les résultats d'études de l'alimentation qui utilisent une cinématique qui ne tient pas compte des effets de la température; il en est de même des études qui font des comparaisons impliquant diverses températures et taxons.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2004

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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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