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Movements of mottled sculpins (Cottus bairdii) in a Michigan stream: how restricted are they?

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We monitored 94 mottled sculpins (Cottus bairdii) marked with passive integrated transponder (PIT) tags to examine seasonal movement patterns. High detection efficiency (mean± standard error = 0.76± 0.03) of PIT-tagged fish was obtained with a portable antenna. Nighttime searches were more effective than daytime relocations in summer, and smaller fish (<65mm) were detected more readily than larger fish (≥65mm). Sculpins used erosional habitats more than depositional habitats, particularly during summer and nighttime. Search attempts within a 150 m reach showed that displacement, mean movement distance, and home range did not differ significantly between summer and winter, suggesting that season did not strongly influence movement. Additionally, movement metrics were unrelated to sculpin size. However, supplementary searches of a larger reach (700m) showed that 16% of PIT-tagged fish movedmore than 100m over 1year, with a maximum displacement of 511m, and mobile fish typically displayed upstream bias. Although most mottled sculpins in our system were relatively sedentary, a small proportion of individuals moved further than previously reported for other systems.

Nous avons suivi 94 chabots tachetés (Cottus bairdii) porteurs de transpondeurs intégrés passifs (PIT) afin d’étudier leurs patrons de déplacements saisonniers. Nous avons obtenu une efficacité élevée de détection (moyenne ± écart type = 0,76 ± 0,03) des poissons marqués de PIT au moyen d’une antenne portative. Les recherches de nuit sont plus efficaces que les relocalisations de jour en été et les poissons plus petits (<65 mm) sont plus facilement décelables que les poissons plus grands (≥65 mm). Les chabots utilisent les habitats d’érosion plus que les habitats de sédimentation, particulièrement en été et durant la nuit. Des tentatives de recherche sur une section de 150 m ont montré que la distance moyenne des déplacements et l’aire vitale ne diffèrent pas significativement durant l’été et l’hiver, ce qui laisse penser que la saison n’influence pas fortement les déplacements. De plus, les métriques des déplacements sont sans relation avec la taille des chabots. Cependant, des recherches additionnelles sur une section plus grande (700 m) ont montré que 16 % des poissons munis de PIT se déplacent de >100 m sur une année avec un déplacement maximal de 511 m et les poissons mobiles montrent typiquement une préférence pour l’amont. Bien que la plupart des chabots tachetés dans notre système soient relativement sédentaires, un petit pourcentage d’individus se déplace sur des distances plus grandes qu’il n’a été observé dans d’autres systèmes.

Document Type: Research Article

Publication date: 2009-01-01

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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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