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Effects of an increase in large wood on abundance and survival of juvenile salmonids (Oncorhynchus spp.) in an Oregon coastal stream

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We examined the effect of an increase in large wood on the summer population size, smolt abundance, and freshwater survival of steelhead (Oncorhynchus mykiss), coastal cutthroat trout (Oncorhynchus clarki clarki), and coho salmon (Oncorhynchus kisutch). We examined these parameters for five brood years prior to the addition of wood and five brood years after in Tenmile Creek, a direct ocean tributary on the Oregon coast. Over the same time frame, a nearby reference stream, Cummins Creek, was also sampled for the same parameters. The input of large wood into Tenmile Creek resulted from a planned habitat restoration project in 1996 and an unplanned addition of wood from a winter storm the same year. Steelhead smolt abundance, steelhead freshwater survival, and coho salmon freshwater survival increased in Tenmile Creek after the input of large wood. Steelhead age-0+ summer populations and steelhead smolt populations increased in the reference stream, although steelhead freshwater survival did not. Coho salmon populations remained unchanged in the reference stream. Our results illustrate the potential shortcomings of the before-after-control-impact study design under field conditions and the potential for misinterpreting results had we employed a more modest sampling plan.

Nous avons examiné les effets d'une augmentation des débris ligneux de grande taille sur la densité de la population en été, sur l'abondance des saumoneaux et sur la survie en eau douce chez la truite arc-en-ciel anadrome (Oncorhynchus mykiss), la truite fardée côtière (Oncorhynchus clarki clarki) et le saumon coho (Oncorhynchus kisutch). Nous avons suivi ces variables chez cinq cohortes annuelles de reproduction avant l'addition du bois et chez cinq cohortes après l'addition dans Tenmile Creek, un tributaire direct de l'océan sur la côte d'Oregon. Pendant la même période, nous avons mesuré les mêmes variables dans un cours d'eau témoin adjacent, Cummins Creek. L'addition de débris ligneux de grande taille résulte d'un projet planifié de restauration de l'habitat en 1996 et d'un apport imprévu de bois lors d'une tempête d'hiver la même année. L'abondance des saumoneaux de truites arc-en-ciel anadromes, la survie en eau douce des truites arc-en-ciel et la survie en eau douce des saumons coho ont augmenté à Tenmile Creek après l'addition de débris de bois de grande taille. Chez la truite arc-en-ciel anadrome du cours d'eau témoin, les populations d'été des poissons d'âge 0+ et les populations de saumoneaux ont augmenté, mais non la survie en eau douce. Les populations de saumons coho n'ont pas varié dans le cours d'eau témoin. Nos résultats illustrent les limites potentielles du plan d'expérience avant-après, témoin-impact dans les conditions de terrain et démontrent qu'il aurait été possible de mal interpréter nos résultats, si nous avions utilisé un plan d'expérience plus simple.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2005

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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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