Diet overlap among size classes of Colorado River cutthroat trout (Oncorhynchus clarki pleuriticus) in a high-elevation mountain stream

Bozek, Michael A.; DeBrey, Larry D.; Lockwood, Jefferey A.

doi:10.1007/bf00126765

Cited by 23 publications

(28 citation statements)

References 29 publications

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“…There were slight increases in gastropod consumption with increased trout age at both sites and in chironomid consumption downstream. A similar small diet shift with age was observed in rainbow trout in a cold Arizona tailwater (McKinney and Speas 2001), and other studies have shown significant overlap in diets among different age classes of trout (e.g., Johnson 1981;Bozek et al 1994). Piscivory in the LRR was limited to four instances of cannibalism on age 0+ brown trout.…”

Section: Proportion Of Maximum Igrmentioning

confidence: 61%

A Bioenergetic Analysis of Factors Limiting Brown Trout Growth in an Ozark Tailwater River

2006

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We examined prey utilization and energy consumption by brown trout, Salmo trutta, in a cold tailwater (Little Red River, Arkansas, USA; LRR) having low biodiversity and low availability of fish as prey. Stomach content analysis and age estimation were performed on thirty brown trout (10 each of three size classes for a total of 710 trout) collected monthly from an upstream and downstream site over a 1-year period. Diet diversity was low at both sites, as 80% and 70% of all prey consumed by upstream and downstream brown trout, respectively, were isopods. Piscivory ( < 0.5% of individuals sampled) and consumption of terrestrial invertebrates were rare. There was no relation between diet diversity and trout age, and a very small ontogenetic shift in brown trout diet. Second, we investigated brown trout growth rates relative to prey consumption and temperature. Temperatures and availability of prey were less than required for maximal trout growth. However, prey availability limited trout growth directly, but sub-optimal temperatures probably buffered the effect of this reduced energy consumption by reducing metabolic energy expenditures. Brown trout growth was 54.8-57.0% of the maximum predicted by a bioenergetics model. Instantaneous growth rates for age 1 and adult brown trout were slightly higher for those downstream (0.195) versus those upstream (0.152). Although isopods are abundant within this tailwater to serve as a forage base, the displacement of native fish fauna and subsequent lack of establishment of cold-tolerant forage fish species due to the thermal regime of hypolimnetic release from Greers Ferry Reservoir probably serves as a major barrier to brown trout growth.

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Section: Proportion Of Maximum Igrmentioning

confidence: 61%

A Bioenergetic Analysis of Factors Limiting Brown Trout Growth in an Ozark Tailwater River

2006

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“…Substantial overlap in diet and resulting potential for competition in the latter study was suggested as the primary mechanism of bull trout displacement by lake trout. Three size classes of Colorado River cutthroat trout O. clarki pleuriticus also demonstrated a similar degree of overlap (0.64 -0.87) in a high-elevation stream (Bozek et al 1994). The authors concluded food may be limiting in those unproductive streams and the high degree of overlap suggested strong intraspecific competition among size classes.…”

Section: Resultsmentioning

confidence: 92%

Bull Trout Life History, Genetics, Habitat Needs, and Limiting Fact in Central and Northeast Oregon. Annual Report 1999.

Hemmingsen¹,

Gunckel²,

Howell³

2001

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“…Johnson 1981;Bozek et al 1994). Significant overlap in diets among different age classes of trout has also been observed in other studies (e.g.…”

Section: Prey Utilisation Versus Available Benthosmentioning

confidence: 99%

Spatial and temporal variation in prey selection of brown trout in a cold Arkansas tailwater

Johnson

Coghlan

Harmon

2007

Ecology of Freshwater Fish

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– We examined prey utilisation patterns of brown trout (Salmo trutta Linnaeus) as related to available benthos in a cold tailwater (Little Red River, Arkansas) having low biodiversity of benthic macroinvertebrates and low availability of fish as prey. Benthic macroinvertebrates were sampled monthly in upstream and downstream sites over a 1‐year period. Stomach content analysis was also performed on 30 brown trout (10 each of three size classes) collected monthly from each site. Benthic and diet diversities were low at both sites, as isopods (Lirceus) accounted for 67% and 51% of the numerical abundance upstream and downstream, respectively, and 80% and 70% of all prey consumed by upstream and downstream brown trout. Physid snails (upstream) and chironomid larvae (downstream) accounted for most of the remaining prey taxa consumed. Piscivory and consumption of terrestrial invertebrates were rare. There was no clear relation between diet diversity and trout size. Densities of benthic macroinvertebrates and prey consumption were significantly greater upstream than downstream. Benthic macroinvertebrate assemblages and prey consumption were seasonally constant at both sites. Generally, prey consumption was consistent with availability of each prey in the benthos; the lack of benthic diversity and overwhelming abundance of one taxon (Lirceus) most likely contributed to food selection patterns. Although isopods are abundant within this tailwater to serve as a forage base, the displacement of native fish fauna because of the thermal regime of hypolimnetic release from Greers Ferry Reservoir probably serves as a major limitation to brown trout growth.

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Diet overlap among size classes of Colorado River cutthroat trout (Oncorhynchus clarki pleuriticus) in a high-elevation mountain stream

Cited by 23 publications

References 29 publications

A Bioenergetic Analysis of Factors Limiting Brown Trout Growth in an Ozark Tailwater River

A Bioenergetic Analysis of Factors Limiting Brown Trout Growth in an Ozark Tailwater River

Bull Trout Life History, Genetics, Habitat Needs, and Limiting Fact in Central and Northeast Oregon. Annual Report 1999.

Spatial and temporal variation in prey selection of brown trout in a cold Arkansas tailwater

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