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Ultraviolet vision and foraging in juvenile bluegill (Lepomis macrochirus)

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Ultraviolet (UV) photoreceptors have been reported in a wide variety of freshwater and marine organisms, suggesting that UV vision is prominent in aquatic ecosystems. However, its adaptive significance remains speculative. The present study tested whether the foraging of juvenile bluegill (Lepomis macrochirus) is enhanced in the presence of UV radiation (UVR). Laboratory feeding trials were conducted in a laminar flow tank in which L. macrochirus juveniles between 2.3 and 3.5 cm standard length were fed the cladoceran Daphnia magna. Sighting and striking distances, as well as capture success, were measured in the presence and absence of UVR. Mean sighting and striking distances and capture success did not differ significantly between the two light treatments. There were also no significant differences in the frequency distributions of sighting and striking distance. These results suggest that UV vision may not be used to enhance foraging in L. macrochirus on Daphnia within the size class tested.

Les photorécepteurs d'ultraviolet (UV) sont connus chez une grande variété d'organismes d'eau douce et d'organismes marins, ce qui laisse croire que la vision UV est importante dans les écosystèmes aquatiques. Cependant, on ne peut que spéculer sur leur signification adaptative. Notre étude vérifie si la recherche de nourriture chez de jeunes crapets arlequins (Lepomis macrochirus) est améliorée en présence de radiation ultraviolette (UVR). Nous avons fait des essais alimentaires en laboratoire dans un aquarium à flux laminaire dans lequel des jeunes L. macrochirus de 2,3–3,5 cm de longueur standard ont été nourris de cladocères Daphnia magna. Nous avons mesuré les distance de repérage et d'attaque, de même que le succès de capture, en présence et en l'absence de UVR. Il n'y a pas de différence significative dans les distances moyennes de repérage et d'attaque, ni dans les taux moyens de capture, dans les deux régimes lumineux. Il n'y a pas non plus de différences significatives dans les distributions de fréquence des distances de repérage et d'attaque. Ces résultats indiquent que la vision UV ne sert sans doute pas à améliorer la recherche de nourriture chez les L. macrochirus sur les Daphnia de la classe de taille examinée.[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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