Habitat saturation drives thresholds in stream subsidies.
Abstract. Understanding how abundance regulates the effects of organisms on their ecosystems remains a critical goal of ecology, especially for understanding inter-ecosystem transfers of energy and nutrients. Here we examined how territoriality and nest-digging by anadromous salmon mediate trophic s...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1072.7058 2023-05-15T14:31:23+02:00 Habitat saturation drives thresholds in stream subsidies. Jonathan W Moore AND Daniel E Schindler Casey P Ruff The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.7058 http://www.sfu.ca/biology/faculty/jwmoore/publications/Moore_etal_Ecology_08.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.7058 http://www.sfu.ca/biology/faculty/jwmoore/publications/Moore_etal_Ecology_08.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.sfu.ca/biology/faculty/jwmoore/publications/Moore_etal_Ecology_08.pdf text 2008 ftciteseerx 2020-04-26T00:24:42Z Abstract. Understanding how abundance regulates the effects of organisms on their ecosystems remains a critical goal of ecology, especially for understanding inter-ecosystem transfers of energy and nutrients. Here we examined how territoriality and nest-digging by anadromous salmon mediate trophic subsidies to stream fishes. Salmon eggs become available for consumption primarily by the digging of salmon that superimpose their nests on previous nests. An individual-based model of spawning salmon predicted that territoriality and habitat saturation produce a nonlinear effect of salmon density on numbers of available eggs to resident predators. Field studies in Alaskan streams found that higher densities of salmon produce disproportionately more eggs in stream drift and in diets of resident fishes (Arctic grayling and rainbow trout). Bioenergetics model simulations indicated that these subsidies produce substantially enhanced growth rates of trout. These results demonstrate that small changes in salmon abundance can drive large changes in subsidies to stream food webs. Thus, the ecological consequences of population declines of keystone species, such as salmon, will be exacerbated when behavior generates nonlinear impacts. Text Arctic grayling Arctic Unknown Arctic |
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description |
Abstract. Understanding how abundance regulates the effects of organisms on their ecosystems remains a critical goal of ecology, especially for understanding inter-ecosystem transfers of energy and nutrients. Here we examined how territoriality and nest-digging by anadromous salmon mediate trophic subsidies to stream fishes. Salmon eggs become available for consumption primarily by the digging of salmon that superimpose their nests on previous nests. An individual-based model of spawning salmon predicted that territoriality and habitat saturation produce a nonlinear effect of salmon density on numbers of available eggs to resident predators. Field studies in Alaskan streams found that higher densities of salmon produce disproportionately more eggs in stream drift and in diets of resident fishes (Arctic grayling and rainbow trout). Bioenergetics model simulations indicated that these subsidies produce substantially enhanced growth rates of trout. These results demonstrate that small changes in salmon abundance can drive large changes in subsidies to stream food webs. Thus, the ecological consequences of population declines of keystone species, such as salmon, will be exacerbated when behavior generates nonlinear impacts. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jonathan W Moore AND Daniel E Schindler Casey P Ruff |
spellingShingle |
Jonathan W Moore AND Daniel E Schindler Casey P Ruff Habitat saturation drives thresholds in stream subsidies. |
author_facet |
Jonathan W Moore AND Daniel E Schindler Casey P Ruff |
author_sort |
Jonathan W Moore |
title |
Habitat saturation drives thresholds in stream subsidies. |
title_short |
Habitat saturation drives thresholds in stream subsidies. |
title_full |
Habitat saturation drives thresholds in stream subsidies. |
title_fullStr |
Habitat saturation drives thresholds in stream subsidies. |
title_full_unstemmed |
Habitat saturation drives thresholds in stream subsidies. |
title_sort |
habitat saturation drives thresholds in stream subsidies. |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.7058 http://www.sfu.ca/biology/faculty/jwmoore/publications/Moore_etal_Ecology_08.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic grayling Arctic |
genre_facet |
Arctic grayling Arctic |
op_source |
http://www.sfu.ca/biology/faculty/jwmoore/publications/Moore_etal_Ecology_08.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1072.7058 http://www.sfu.ca/biology/faculty/jwmoore/publications/Moore_etal_Ecology_08.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766305036883722240 |