Monthly and Size-Related Changes in the Diet of Rainbow Trout in Lake Oahe, South Dakota

Lynott, Sean T.; Bryan, Scott D.; Hill, Tracy D.; Duffy, Walter G.

doi:10.1080/02705060.1995.9663463

Cited by 6 publications

(8 citation statements)

References 7 publications

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“…However, it seems that our manipulation was a weak one. Given the lack of risk effects between lakes, then the slightly higher age-0 trout mortality observed in lakes with large adults can be attributed to the fact that large trout are more efficient predators (e.g., Lynott et al 1995), or simply due to the greater overall density of predators in lakes with large trout (365 vs. 300 predators/ha).…”

Section: Discussionmentioning

confidence: 99%

“…Beckmann, unpublished data). Larger adult trout were used to impose an additional risk to age-0 trout, as they are more likely to successfully capture age-0 trout than smaller adults (e.g., Lynott et al 1995). Therefore, we would expect these relatively few large adults to have a larger effect on age-0 trout behavior and mortality than an equal number of small adults, as suggested by Post et al (1999).…”

Section: Experimental Designmentioning

confidence: 99%

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From Individuals to Populations: Prey Fish Risk-Taking Mediates Mortality in Whole-System Experiments

Biro

Post

Parkinson

2003

Ecology

120

162

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Recent research suggests that the behavior of individuals under risk of predation could be a key link between individual behavior and population and community dynamics. Yet existing theory remains largely untested at large spatial and temporal scales. We manipulated food available to age‐0 rainbow trout while at risk of cannibalism, in a replicated factorial whole‐lake experiment, to test whether the trade‐off between growth and mortality rates is mediated by foraging activity by young fish under predation risk. We found that this trade‐off exists for young fish at the whole‐system scale, and that food‐dependent behavioral variation has large mortality consequences. In high‐food lakes, age‐0 trout spent less time moving, fewer individuals swam continuously, and those swimming continuously swam at slower speeds relative to those in low‐food lakes. Age‐0 trout also used deep, risky habitats less when food was abundant. This lower activity, combined with avoidance of risky habitats, coincided with 68% higher survival in high‐food lakes. If general, this trade‐off may be a key mechanism linking individual behavior to population‐level processes in size‐structured populations.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

From Individuals to Populations: Prey Fish Risk-Taking Mediates Mortality in Whole-System Experiments

Biro

Post

Parkinson

2003

Ecology

120

162

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“…Kokanee are usually highly zooplanktivorous (Rieman and Bowler 1980;Martinez and Bergersen 1991) and should incorporate a phytoplanktonderived carbon signature into their flesh, whereas rainbow trout in reservoirs typically feed on some combination of terrestrial insects and zooplankton (Trojnar and Behnke 1974;Lynott et al 1995), imparting a composite of terrestrial and pelagic carbon signatures. Catostomids are more benthic in their habits and probably derive energy from benthic pathways (Hecky and Hesslein 1995), although longnose suckers are known to consume zooplankton in Colorado reservoirs (Trojnar and Behnke 1974;B.…”

Section: Discussionmentioning

confidence: 99%

Tracking Trophic Interactions in Coldwater Reservoirs Using Naturally Occurring Stable Isotopes

Johnson

Martinez

Stockwell

2002

Transactions of the American Fisheries Society

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We measured signatures of naturally occurring stable isotopes of carbon ( 13 C) and nitrogen ( 15 N) in important invertebrate and fish taxa in two coldwater reservoirs in Colorado that had different food webs. One reservoir, Lake Granby, contained a large population of an opossum shrimp, Mysis relicta, and the other, Blue Mesa Reservoir, did not. We compared temporal dynamics of isotopic signatures of all taxa between lakes to quantify sources of variability in consumer signatures and to assess potential turnover rates of isotopic signatures in the top predator. Stable isotope signatures varied little across season or body size within most taxa, but large differences across reservoirs were observed. Nitrogen signatures of lake trout Salvelinus namaycush were enriched in larger individuals in both reservoirs, indicating increasing trophic position with body size. Carbon signatures in lake trout livers were consistently lower than those in muscle samples but did not change more rapidly than muscle signatures, suggesting that either lake trout diet was relatively invariant during the study or that liver signatures change at the same rate as muscle signatures in these fish. Inferences about diets from carbon and nitrogen signatures were corroborated by information from stomach analysis. Food web structure derived from stable isotope analysis indicated large differences in energy and materials pathways between the reservoirs with and without M. relicta. Rather than diversifying trophic structure by providing an alternative food source for planktivorous sport fish, as the introduction originally intended, M. relicta in Lake Granby short-circuited a major energy conduit, the zooplankton, from channeling pelagic primary production into sport fish biomass.

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“…3), whereas a similar proportion of changes in water clarity were explained mainly by physical controls (ENSO-PDO, river inflow) ( Table 2). Given that the food-web structure and hydrological cycle of Lake Diefenbaker are similar to those observed for many of the largest reservoirs in the United States (Bolgrien et al, 2009;Bowersox et al, 2014;Lynott et al, 1995), we suggest that our findings provide a useful model for lacustrine regulatory processes in reservoirs in much of central and western North America. Specifically, we forecast that future declines in river inflow from mountain snowfields (Lapp et al, 2013;St.…”

Section: Discussionmentioning

confidence: 66%

“…This event was one of a series of unintended releases during the past 15 years. Rainbow trout have a varied diet in large reservoirs of central North America, but prefer large-bodied zooplankton and other invertebrates when fish are up to 46 cm in length (Lynott et al, 1995). Consistent with the effects of size-selective predation by visually-orienting fish, densities of largebodied Daphnia and copepods declined nearly 75% between 2000 and 2012 (Fig.…”

Section: Phytoplankton Abundancementioning

confidence: 66%

Decadal regulation of phytoplankton abundance and water clarity in a large continental reservoir by climatic, hydrologic and trophic processes

Vogt

Sharma

Leavitt

2015

Journal of Great Lakes Research

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Monthly and Size-Related Changes in the Diet of Rainbow Trout in Lake Oahe, South Dakota

Cited by 6 publications

References 7 publications

From Individuals to Populations: Prey Fish Risk-Taking Mediates Mortality in Whole-System Experiments

From Individuals to Populations: Prey Fish Risk-Taking Mediates Mortality in Whole-System Experiments

Tracking Trophic Interactions in Coldwater Reservoirs Using Naturally Occurring Stable Isotopes

Decadal regulation of phytoplankton abundance and water clarity in a large continental reservoir by climatic, hydrologic and trophic processes

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