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Tidal movements and residency of subyearling Chinook salmon (Oncorhynchus tshawytscha) in an Oregon salt marsh channel

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Abstract:

A novel application of full-duplex passive integrated transponder (PIT) tag technology was used to investigate movements of individual subyearling Chinook salmon (Oncorhynchus tshawytscha; fork length≥ 60mm) into and out of tidally flooded salt marsh habitat in the Salmon River estuary, Oregon, USA. PIT interrogation was effective, with mean tag detection≥ 92%. Salmon movement peaked late during both flood and ebb tide periods, indicating that salmon did not drift passively. Most movements were in the direction of tidal currents, but 20% of individuals entered the channel against the ebbing tide. Individuals occupied the intertidal channel for a median 4.9h and as long as 8.9h per tidal cycle, and few were detected moving when water depth was<0.4m. Some individuals used the channel on multiple successive tidal cycles, and others entered intermittently over periods of up to 109days. Using an individual-based approach, we characterized diversity of juvenile Chinook salmon behavior within a marsh channel, providing insight into the value of such habitats for conservation and restoration of salmon populations.

Une utilisation inédite de la technologie des transpondeurs passifs intégrés à transmission bidirectionnelle simultanée (étiquettes PIT) a servi à étudier les déplacements de saumons chinook (Oncorhynchus tshawytscha; longueur à la fourche ≥ 60 mm) âgés de moins d’un an lors de leur entrée ou sortie d’un habitat de marais salant inondé par la marée dans l’estuaire de la rivière Salmon, Oregon, É.-U. Le système d’interrogation des PIT est efficace avec une détection moyenne de ≥ 92 % des étiquettes. Les déplacements des saumons atteignent un maximum à la fin des marées montantes et descendantes, ce qui indique que les saumons ne dérivent pas passivement. La plupart des déplacements se font dans le sens des courants de marée, mais 20 % des individus pénètrent dans le chenal contre la marée descendante. Les individus se retrouvent dans le chenal interdital pour une médiane de 4,9 h et jusqu’à 8,9 h pendant un cycle de marée et certains ont été observés se déplacer dans des eaux de < 0,4 m de profondeur. Quelques individus utilisent le chenal pendant plusieurs cycles successifs de marée et d’autres y pénètrent de façon intermittente pendant une période aussi longue que 109jours. En utilisant une approche basée sur l’individu, nous décrivons la diversité des comportements de jeunes saumons chinook dans un chenal de marais, ce qui fournit une perspective sur la valeur de tels habitats pour la conservation et la restauration des populations de saumons.

Document Type: Research Article

Publication date: 2010-03-01

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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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