On-animal acoustic monitoring provides insight to ungulate foraging behavior
Item Metadata
Dublin Core
Title
On-animal acoustic monitoring provides insight to ungulate foraging behavior
Description
Foraging behavior underpins many ecological processes; however, robust assessments of this behavior for free-ranging animals are rare due to limitations to direct observations. We leveraged acoustic monitoring and GPS tracking to assess the factors influencing foraging behavior of mule deer (Odocoileus hemionus). We deployed custom-built acoustic collars with GPS radiocollars on mule deer to measure location-specific foraging. We quantified individual bites and steps taken by deer, and quantified two metrics of foraging behavior: the number of bites taken per step and the number of bites taken per unit time, which relate to foraging intensity and efficiency. We fit statistical models to these metrics to examine the individual, environmental, and anthropogenic factors influencing foraging. Deer in poorer body condition took more bites per step and per minute and foraged for longer irrespective of landscape properties. Other patterns varied seasonally with major changes in deer condition. In December, when deer were in better condition, they took fewer bites per step and more bites per minute. Deer also foraged more intensely and efficiently in areas of greater forage availability and greater movement costs. During March, when deer were in poorer condition, foraging was not influenced by landscape features. Anthropogenic factors weakly structured foraging behavior in December with no relationship in March. Most research on animal foraging is interpreted under the framework of optimal foraging theory. Departures from predictions developed under this framework provide insight to unrecognized factors influencing the evolution of foraging. Our results only conformed to our predictions when deer were in better condition and ecological conditions were declining, suggesting foraging strategies were state-dependent. These results advance our understanding of foraging patterns in wild animals and hig
Bibliographic Citation
Northrup, J. M., A. Avrin, C. R. Anderson Jr, E. Brown, and G. Wittemyer. 2019. On-animal acoustic monitoring provides insight to ungulate foraging behavior. Journal of Mammalogy 100:1479–1489. https://doi.org/10.1093/jmammal/gyz124
Creator
Northrup, Joseph M.
Avrin, Alexandra
Anderson Jr, Charles R.
Brown, Emma
Wittemyer, George
Subject
Acoustic monitoring
Bayesian hierarchical model
Colorado
Foraging behavior
Herbivore foraging
Mule deer
Odocoileus hemionus
Spatial ecology
Extent
11 pages
Date Created
2019-08-28
Type
Article
Format
application/pdf
Language
English
Is Part Of
Journal of Mammalogy
Collection
Citation
Northrup, Joseph M. et al., “On-animal acoustic monitoring provides insight to ungulate foraging behavior,” CPW Digital Collections, accessed April 25, 2024, https://cpw.cvlcollections.org/items/show/109.