Morphological and swimming stamina differences between Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri), rainbow trout (Oncorhynchus mykiss), and their hybrids

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Abstract:

We hypothesized that body shape differences between Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri), rainbow trout (Oncorhynchus mykiss), and their hybrids may influence swimming ability and thus play an important role in the invasion of nonnative rainbow trout and hybrid trout into native cutthroat trout populations. We reared Yellowstone cutthroat trout, rainbow trout, and reciprocal hybrid crosses in a common environment and conducted sustained swimming trials in order to test for genetically based morphological and swimming stamina differences. Linear and geometric morphometric analyses identified differences in body shape, with cutthroat trout having slender bodies and small caudal peduncles and rainbow trout having deep bodies and long caudal peduncles. Hybrid crosses were morphologically intermediate to the parental genotypes, with a considerable maternal effect. Consistent with morphological differences, cutthroat trout had the lowest sustained swimming velocity and rainbow trout had the highest sustained swimming velocity. Sustained swimming ability of hybrid genotypes was not different from that of rainbow trout. Our results suggest that introduced rainbow trout and cutthroat-rainbow trout hybrids potentially out-compete native Yellowstone cutthroat trout through higher sustained swimming ability.

Nous avons émis l'hypothèse selon laquelle les différences de forme du corps entre la truite fardée de Yellowstone (Oncorhynchus clarkii bouvieri), la truite arc-en-ciel (Oncorhynchus mykiss) et leurs hybrides peuvent affecter la capacité de nage et ainsi jouer une rôle dans l'envahissement des populations indigènes de truites fardées par les truites arc-en-ciel non indigènes et les truites hybrides. Nous avons élevé des truites fardées de Yellowstone, des truites arc-en-ciel et de truites issues de croisements hybrides réciproques dans un environnement commun et nous avons mené des tests de nage soutenue afin de vérifier l'existence des différences d'origine génétique dans la morphologie et dans la vigueur de nage. Des analyses morphométriques linéaires et géométriques mettent en évidence des différences dans la forme du corps: les truites fardées possèdent un corps élancé et un pédoncule caudal réduit, alors que les truites arc-en-ciel ont un corps profond et un long pédoncule caudal. Les truites des croisements hybrides ont une morphologie intermédiaire par rapport aux génotypes des parents avec un effet maternel marqué. En accord avec les différences morphologiques, les truites fardées ont la vitesse de nage soutenue la plus faible et les truites arc-en-ciel la vitesse de nage soutenue la plus élevée. La capacité de nage soutenue des génotypes hybrides ne diffère pas de celle des truites arc-en-ciel. Nos résultats indiquent que les truites arc-en-ciel introduites et les hybrides des truites fardées et arc-en-ciel peuvent potentiellement gagner la compétition avec les truites fardées indigènes à cause de leur capacité supérieure de nage soutenue.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: January 1, 2007

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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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