reference : Trophic cascades in a multicausal world: Isle Royale and Yellowstone

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reftype Journal Article
Abstract Questions of whether trophic cascades occur in Isle Royale National Park (IRNP) or Yellowstone National Park's northern range (NR) cannot lead to simple, precise, or definitive answers. Such answers are limited especially by multicausality in the NR and by complex temporal variation in IRNP. Spatial heterogeneity, contingency, and nonequilibrium dynamics also work against simple answers in IRNP and NR. The existence of a trophic cascade in IRNP and NR also depends greatly on how it is defined. For example, some conceive of trophic cascades as entailing essentially any indirect effect of predation. This may be fine, but the primary intellectual value of such a conception may be to assess an important view in community ecology that most species are connected to most other species in a food web through a network of complicated, albeit weak, indirect effects. These circumstances that work against simple answers likely apply to many ecosystems. Despite the challenges of assessing the existence of trophic cascades in IRNP and NR, such assessments result in considerable insights about a more fundamental question: What causes population abundance to fluctuate?
Author Peterson, Rolf O.; John A. Vucetich; Joseph M. Bump; Douglas W. Smith
DOI 10.1146/annurev-ecolsys-120213-091634
Issue 1
Journal Annual Review of Ecology, Evolution, and Systematics
Keywords moose,elk,wolf,predation,herbivory,ecosystem
Pages 325-345
Title Trophic cascades in a multicausal world: Isle Royale and Yellowstone
Volume 45
Year 2014
Bibliographic identifiers
_record_number 26423
_uuid 00b08ed0-179f-46c3-8f82-123a2244366f