Microhabitat Partitioning among Stream-Dwelling juvenile Coho Salmon, <i>Oncorhynchus kisutch</i>, and Dolly Varden, <i>Salvelinus malma</i>

Dolloff, C. Andrew; Reeves, Cordon H.

doi:10.1139/f90-256

Cited by 46 publications

(30 citation statements)

References 8 publications

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“…In stream-dwelling salmonids, field observations and laboratory experiments suggest that selective segregation for cover use (i.e. innate cover preference resulting from natural selection) plays a major role in the coexistence of closely related species (CUNJAK and GREEN, 1983;DOLLOFF and REEVES, 1990). However, there is also experimental evidence on interactive segregation (i.e.…”

Section: Competitionmentioning

confidence: 99%

“…Because of its different functional roles, cover use also varies broadly among species (HEGGENES and TRAAEN, 1988;DOLLOFF and REEVES, 1990;THÉVENET, 1998), fish size or age (GRANT and NOAKES, 1987;MIKHEEV et al, 1994;REINHARDT and HEALEY, 1997), sex (ABRAHAMS and DILL, 1989), life-history strategy (HUNTINGFORD et al, 1988b;GRAND, 1999), and more generally with individual energetic status. Several studies have shown that hungry or energy-stressed (i.e.…”

Section: Cover Use and Trade-offsmentioning

confidence: 99%

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Nature and Functions of Cover for Riverine Fish.

Allouche¹

2002

Bull. Fr. Pêche Piscic.

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This review attempts to assess the nature and the role of cover for riverine fish assemblages. Although early identified as a key factor for fish distribution, especially for salmonids, cover (i.e. woody debris, undercut banks, boulders, turbidity...) still remains the variable least considered in the studies of fish habitat relationships. This is mainly due to the diversity of ecological functions of cover structures in fish assemblages. Cover structures are structuring components of fish habitat and contribute to the biological productivity of streams. But, at the individual scale, cover fulfils three main functions: protection against predators, visual isolation reducing competition, and hydraulic shelter. In fact, the use of cover by fish results from a trade-off between the costs and the benefits associated with its use. Although the relationships between fish and cover appear extremely complex and context-specific, a growing body of evidence highlights the potential role of cover for management purposes.Key-words : cover, shelter, riverine fish, fish habitat. NATURE ET FONCTIONS DU COUVERT POUR LES POISSONS LOTIQUES. RÉSUMÉCet article décrit la typologie ainsi que les fonctions du couvert pour les poissons lotiques. Identifié très tôt comme un facteur explicatif de la distribution des poissons, principalement chez les salmonidés, le couvert (i.e. débris ligneux, sous-berges, blocs, turbidité...) demeure néanmoins la variable la moins considérée dans l'étude des relations habitat-poissons. Ceci s'explique notamment par les fonctions écologiques très diverses que le couvert remplit vis-à-vis des assemblages piscicoles. Les structures pourvoyeuses de couvert sont des agents structurants de l'habitat piscicole et contribuent à la productivité biologique des cours d'eau. Au niveau du microhabitat du poisson, le couvert remplit trois fonctions majeures : anti-prédation, isolation visuelle limitant la compétition, et abri hydraulique. En fait, l'utilisation du couvert par les poissons résulte d'un compromis entre les coûts et les bénéfices associés d'où l'extrême complexité de cette relation qui semble plutôt spécifique à un contexte donné. Malgré les difficultés d'extrapolation, de nombreux travaux mettent en évidence la signification écologique ainsi que l'utilisation potentielle du couvert pour une gestion optimale des ressources piscicoles.Mots-clés : couvert, abri, poissons lotiques, habitat piscicole.

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Section: Competitionmentioning

confidence: 99%

Section: Cover Use and Trade-offsmentioning

confidence: 99%

Nature and Functions of Cover for Riverine Fish.

Allouche¹

2002

Bull. Fr. Pêche Piscic.

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“…Shallow water was found in reaches with variable widths, but deep water (>0.7 m) was limited to intermediate stream widths between 5 and 15 m. Although juvenile coho salmon generally occupy water less than a metre deep (Bjornn & Reiser, 1991), the association between depth and age is supported by previous work. An examination of summer habitat associations by Dolloff and Reeves (1990) found a similar result. An examination of summer habitat associations by Dolloff and Reeves (1990) found a similar result.…”

Section: Discussionmentioning

confidence: 62%

Cohort‐specific variation in juvenile coho salmon habitat use

Bradley

Sethi

Ashline

et al. 2016

Ecology of Freshwater Fish

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In this study, we examined summer and fall freshwater rearing habitat use by juvenile coho salmon (Oncorhynchus kisutch) in the quickly urbanising Big Lake drainage in south-central Alaska. Habitat use was assessed by regressing fish count data against habitat survey information across thirty study sites using generalised linear mixed models. Habitat associations were examined by age-0 and age-1+ cohorts separately, providing an opportunity to compare habitat use across different juvenile coho salmon life stages during freshwater rearing. Regression results indicated that the age-0 cohorts were strongly associated with shallow, wide stream reaches with in-stream vegetation, whereas age-1+ cohorts were associated with deeper stream reaches.Furthermore, associations between fork length and habitat characteristics suggest cohort-specific habitat use patterns are distinct from those attributable to fish size.Habitat use information generated from this study is being used to guide optimal fish passage restoration planning in the Big Lake drainage. Evidence for habitat use partitioning by age cohort during freshwater juvenile rearing indicates that pooling age cohorts into a single "juvenile" stage for the purposes of watershed management may mask important habitat use dynamics. K E Y W O R D Scoho salmon, habitat use, cohort variation, generalised linear mixed model

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“…In contrast, the abundance of the masu salmon was positively affected by undercut banks. Undercut banks are defined as ''concealment'' cover, rather than as factors that mitigate interference competition [28]. The masu salmon use the surface range of the water column, where they are vulnerable to terrestrial predators [15].…”

Section: Discussionmentioning

confidence: 99%

Habitat niche separation of the nonnative rainbow trout and native masu salmon in the Atsuta River, Hokkaido, Japan

2010

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The mechanisms by which nonnative species establish populations can be classified into two broad categories: they usurp the niches of native species through interspecific competition, or they avoid this intense interspecific competition by making use of minimal niche overlap with the native species. In this study, we considered how a nonnative salmonid species, the rainbow trout Oncorhynchus mykiss, established a population in the presence of the native salmonid species, the masu salmon O. masou, in Hokkaido, Japan. Circumstantial field evidence shows that the masu salmon exceeds the rainbow trout in abundance and suggests that these species use different types of cover habitat (rainbow trout abundance increases with increasing abundance of large woody debris aggregates, whereas masu salmon abundance increases with increasing abundance of undercut banks). These results imply that the rainbow trout established a population due to minimal niche overlap with the masu salmon, and not by competitive exclusion of the native species.

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Microhabitat Partitioning among Stream-Dwelling juvenile Coho Salmon, Oncorhynchus kisutch, and Dolly Varden, Salvelinus malma

Cited by 46 publications

References 8 publications

Nature and Functions of Cover for Riverine Fish.

Nature and Functions of Cover for Riverine Fish.

Cohort‐specific variation in juvenile coho salmon habitat use

Habitat niche separation of the nonnative rainbow trout and native masu salmon in the Atsuta River, Hokkaido, Japan

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