Nonnative Lake Trout Result in Yellowstone Cutthroat Trout Decline and Impacts to Bears and Anglers

Koel, Todd M.; Bigelow, Patricia E.; Doepke, Philip D.; Ertel, Brian D.; Mahony, Daniel L.

doi:10.1577/1548-8446(2005)30[10:nltriy]2.0.co;2

Cited by 128 publications

(215 citation statements)

References 13 publications

Supporting

Mentioning

204

Contrasting

Unclassified

Order By: Relevance

“…The native cutthroat trout population has drastically declined in Yellowstone Lake due to lake trout, whirling disease, and drought (Koel et al 2005). Lake trout were illegally introduced into Yellowstone Lake around 1985 (Munro et al 2005).…”

Section: Study Sitementioning

confidence: 99%

“…Cutthroat trout abundance recently declined after the invasion of illegally introduced lake trout (;1985). The number of cutthroat trout was modified from Koel et al (2005).…”

Section: Study Sitementioning

confidence: 99%

“…Finally, drought can affect juvenile cutthroat trout in small spawning streams by stranding individuals, and reducing egg and fry survival because of higher water temperatures. All three stressors likely reduced the cutthroat trout of Yellowstone Lake; however, lake trout predation probably had the greatest impact because whirling disease and drought are restricted to certain spawning streams, but the lake-wide cutthroat trout population has been affected by lake trout predation (Koel et al 2005).…”

Section: Study Sitementioning

confidence: 99%

“…The cutthroat trout populations has fluctuated over the last century, but abundance declined by 60% since 1990 ( Fig. 1; Koel et al 2005). Cutthroat trout abundance was low from 1953 to 1961 because of egg-taking and liberal creel limits.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Introduced lake trout alter nitrogen cycling beyond Yellowstone Lake

2015

Self Cite

View full text Add to dashboard Cite

Citation: Tronstad, L. M., R. O. Hall Jr., and T. M. Koel. 2015. Introduced lake trout alter nitrogen cycling beyond Yellowstone Lake. Ecosphere 6(11):224. http://dx.doi.org/10.1890/ES14-00544.1Abstract. Introduced predators can have large effects on the ecosystem in which they were introduced, but how much these effects extend to other ecosystems beyond the invaded one is less known. We compared how lake trout (Salvelinus namaycush) affected nutrient cycling in an invaded and adjacent ecosystem in Yellowstone National Park, Wyoming, USA. Introduced lake trout in Yellowstone Lake caused the native Yellowstone cutthroat trout (Oncoryhynchus clarkii bouvieri ) population to decline. Native cutthroat trout are a dominant animal in the lake and may alter nutrient cycling in both Yellowstone Lake where they reside and in tributary streams used for spawning. We estimated changes in nutrient transport and nutrient uptake in both Yellowstone Lake and Clear Creek, a spawning stream, before and after the invasion of lake trout. Annual area-specific excretion fluxes from cutthroat trout were nine times higher in Clear Creek compared to Yellowstone Lake when cutthroat trout were abundant. However, fluxes within the lake and stream were similar after cutthroat trout declined. In Yellowstone Lake, zooplankton excretion supplied 86% of ammonium (NH 4 þ ) that was taken up, but cutthroat trout only supplied ,0.3% after the introduction of lake trout. Conversely, NH 4 þ excreted by cutthroat trout was likely a major flux in ClearCreek, because NH 4 þ fluxes from cutthroat trout exceeded watershed export of NH 4 þ in years when .3000 cutthroat trout spawned. Furthermore, NH 4 þ excretion fluxes from spawning cutthroat trout in ClearCreek supplied up to 6.1% of the NH 4 þ demanded by microbes after the introduction of lake trout.However, based on modeled past NH 4 þ uptake, we estimated that up to 60% of NH 4 þ excreted by spawning cutthroat trout may have been taken up by stream microbes when cutthroat trout were abundant. Therefore, transported NH 4 þ from spawning cutthroat trout was likely an integral part of N cycling in tributary streams in the past. By comparing the effects of declining cutthroat trout on two ecosystems, we show that lake trout had a larger effect on N cycling within an adjacent stream ecosystem than the invaded lake ecosystem itself, because the migratory behavior of cutthroat trout concentrated them in spawning streams increasing their effect.

show abstract

Section: Study Sitementioning

confidence: 99%

“…Cutthroat trout abundance recently declined after the invasion of illegally introduced lake trout (;1985). The number of cutthroat trout was modified from Koel et al (2005).…”

Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Introduced lake trout alter nitrogen cycling beyond Yellowstone Lake

2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Alternately, while sympatric with competitively-dominant brown trout (Saln~o tnltta), subordinate brook charr underwent a niche-shift, occupying microhabitats that offered less potential for net energy gain than those occupied in allopatry (Fausch and White 1986). Such competition has been implicated in the decline or extirpation of many native salillonines after exotic salmonine invasion (Larson and Moore 1985, Nakano et al 1998, Koel et al 2005.…”

Section: Introductionmentioning

confidence: 99%

Prey Selection of Subyearling Atlantic Salmon and Rainbow Trout Coexisting in a Natural Stream

Coghlan

Cain

Ringler

2007

Journal of Freshwater Ecology

View full text Add to dashboard Cite

Atlantic salmon (Salmo salar) and rainbow trout (OncovCiynchus mykiss) are similar ecologically but share no coevolutionary histoly favoring the evolution of niche-partitioning mechanisms. Therefore, interspecifi c competition may occur as each species becomes naturalized throughout the other's native range. As a first step towards investigating competitive interactions, we tested hypotheses regarding prey selection in allopatric and sympatric populations of Atlantic salmon and rainbow trout in a natural stream. Diet samples from 184 fish and contemporary drift samples were collected during a 24-hour period in mid-summer. Diet overlap was low between salmon and trout in allopatry, but high in sympatry. Salmon consumed more prey and a greater proportion of baetid mayflies than did trout, which fed more frequently on chironomid larvae and aerial-terrestrial invertebrates. Both species consumed larger prey when allopatric than when sympatric. Salinon in allopatry fed as generalists and trout in allopatry fed as specialists, but diets converged when in syinpatry. Feeding habits of both salmonines seemed to be affected by the other's presence, although more notably for trout. Results were more consistent with predictions based on optimal foraging theory than on niche-partitioning theory.

show abstract

Spatiotemporal predictions of the alternative prey hypothesis: Predator habitat use during decreasing prey abundance

et al. 2023

View full text Add to dashboard Cite

The alternative prey hypothesis supposes that predators supported by a primary prey species will shift to consume alternative prey during a decrease in primary prey abundance. The hypothesis implies that during declines of one prey species, a predator modifies their behavior to exploit a secondary, or alternative, species. Despite occurring in many systems, the behavioral mechanisms (e.g., habitat selection) allowing predators to shift toward alternative prey during declines in the abundance of their primary prey are poorly understood. We evaluated habitat selection and use by a generalist predator with respect to two prey species during a dramatic decrease in the abundance of primary prey. Further, we evaluated how spatial variation in access to primary prey affected habitat selection, and assessed similarity and overlap between habitats used by each prey species. Coyotes (Canis latrans) exhibited decreasing selection for cottontail rabbits (Sylvilagus spp.; primary prey) during population decreases but did not shift habitat selection toward neonate mule deer (Odocoileus hemionus; alternative prey). Use of rabbit habitat remained high even during historically low rabbit abundance, while mule deer habitat was used in proportion to its availability. Coyotes seemingly do not make large shifts in habitat selection toward alternative prey following spatial and temporal decreases in the abundance of primary prey, but instead, take advantage of habitat overlap to facilitate prey‐switching behavior. Our work extends previous research conducted under the alternative prey hypothesis by explicitly evaluating the influence of habitat overlap between prey species and variation in access to prey habitat as factors affecting prey‐switching behaviors in predators.

show abstract

Nonnative Lake Trout Result in Yellowstone Cutthroat Trout Decline and Impacts to Bears and Anglers

Cited by 128 publications

References 13 publications

Introduced lake trout alter nitrogen cycling beyond Yellowstone Lake

Introduced lake trout alter nitrogen cycling beyond Yellowstone Lake

Prey Selection of Subyearling Atlantic Salmon and Rainbow Trout Coexisting in a Natural Stream

Spatiotemporal predictions of the alternative prey hypothesis: Predator habitat use during decreasing prey abundance

Contact Info

Product

Resources

About