Article
 

Threshold levels of generalist predation determine consumer response to resource pulses

Public Deposited

Contenu téléchargeable

Télécharger le fichier PDF
https://ir.library.oregonstate.edu/concern/articles/5m60qt688

Descriptions

Attribute NameValues
Creator
Abstract
  • Many ecological systems are characterized by brief periods of increased resource availability called resource pulses. Empirical studies suggest that some populations of primary consumers grow rapidly in response to resource pulses, but others instead remain at low abundance despite increases in resource availability. Previous theory suggests that the lack of increase in primary consumers might be due to predators, which can respond to increased prey density both numerically, by increasing their own population, and functionally, by killing prey at a faster rate. The complexity of potential population responses to resource pulses can be assessed with simulations, but analytical conditions determining when one observes qualitatively distinct dynamics have yet to be identified. Here we use a graphical method based on a bifurcation diagram to derive the conditions leading to qualitatively distinct steady state and transient prey population dynamics as levels of predation (abundance and diversity) vary. When predation thresholds are crossed, consumer populations respond numerically to increases in their resources and provide a secondary resource pulse to their predators and parasites. These community dynamics have broad implications for the impact of changing predator communities on insect and rodent population outbreaks, which are economically and epidemiologically important.
  • This is the publisher’s final pdf. The published article is copyrighted by the Authors and Nordic Society Oikos. It is published by John Wiley & Sons, Inc. This article can be found at: http://onlinelibrary.wiley.com/doi/10.1111/oik.01487/abstract;jsessionid=075AC1893098BC7BF86AEFC9E64919BE.f04t01
Resource Type
DOI
Date Available
Date Issued
Citation
  • Levi, T., Kilpatrick, A. M., Barfield, M., Holt, R. D., Mangel, M., & Wilmers, C. C. (2015). Threshold levels of generalist predation determine consumer response to resource pulses. Oikos, 124(11), 1436-1443. doi: 10.1111/oik.01487
Journal Title
Journal Volume
  • 124
Journal Issue/Number
  • 11
Déclaration de droits
Funding Statement (additional comments about funding)
  • This work was funded by an NSF GRF, PRFB and Cota-Robles fellowships to TL, NSF grants EF-0914866 to AMK, EF 0921495 to MM and NSF grant 0963022 to CCW. TL, RDH and MB thank the Univ. of Florida Foundation for support.
Publisher
Peer Reviewed
Language
Replaces

Des relations

Parents:

This work has no parents.

Articles

La vignette Titre Date de téléchargement Visibilité actes
file details LeviThresholdLevelsGeneralistPredationDetermineConsumerResponse.pdf 2017-07-26 Public Télécharger