State-dependent foraging by caribou with different nutritional requirements
Foraging by animals is hypothesized to be state-dependent, that is, varying with physiological condition of individuals. State often is defined by energy reserves, but state also can reflect differences in nutritional requirements (e.g., for reproduction, lactation, growth, etc.). Testing hypotheses...
Published in: | Journal of Mammalogy |
---|---|
Main Authors: | , , , , |
Format: | Text |
Language: | English |
Published: |
American Society of Mammalogists
2020
|
Subjects: | |
Online Access: | https://doi.org/10.1093/jmammal/gyaa003 |
id |
ftbioone:10.1093/jmammal/gyaa003 |
---|---|
record_format |
openpolar |
spelling |
ftbioone:10.1093/jmammal/gyaa003 2024-06-02T08:05:15+00:00 State-dependent foraging by caribou with different nutritional requirements Kristin Denryter Rachel C. Cook John G. Cook Katherine L. Parker Michael P. Gillingham Kristin Denryter Rachel C. Cook John G. Cook Katherine L. Parker Michael P. Gillingham world 2020-03-02 text/HTML https://doi.org/10.1093/jmammal/gyaa003 en eng American Society of Mammalogists doi:10.1093/jmammal/gyaa003 All rights reserved. https://doi.org/10.1093/jmammal/gyaa003 Text 2020 ftbioone https://doi.org/10.1093/jmammal/gyaa003 2024-05-07T00:55:08Z Foraging by animals is hypothesized to be state-dependent, that is, varying with physiological condition of individuals. State often is defined by energy reserves, but state also can reflect differences in nutritional requirements (e.g., for reproduction, lactation, growth, etc.). Testing hypotheses about state-dependent foraging in ungulates is difficult because fine-scale data needed to evaluate these hypotheses generally are lacking. To evaluate whether foraging by caribou (Rangifer tarandus) was state-dependent, we compared bite and intake rates, travel rates, dietary quality, forage selection, daily foraging time, and foraging strategies of caribou with three levels of nutritional requirements (lactating adults, nonlactating adults, subadults 1–2 years old). Only daily foraging times and daily nutrient intakes differed among nutritional classes of caribou. Lactating caribou foraged longer per day than nonlactating caribou—a difference that was greatest at the highest rates of intake, but which persisted even when intake was below requirements. Further, at sites where caribou achieved high rates of intake, caribou in each nutritional class continued foraging even after satisfying daily nutritional requirements, which was consistent with a foraging strategy to maximize energy intake. Foraging time by caribou was partially state-dependent, highlighting the importance of accounting for physiological state in studies of animal behavior. Fine-scale foraging behaviors may influence larger-scale behavioral strategies, with potential implications for conservation and management. Text caribou Rangifer tarandus BioOne Online Journals Journal of Mammalogy 101 2 544 557 |
institution |
Open Polar |
collection |
BioOne Online Journals |
op_collection_id |
ftbioone |
language |
English |
description |
Foraging by animals is hypothesized to be state-dependent, that is, varying with physiological condition of individuals. State often is defined by energy reserves, but state also can reflect differences in nutritional requirements (e.g., for reproduction, lactation, growth, etc.). Testing hypotheses about state-dependent foraging in ungulates is difficult because fine-scale data needed to evaluate these hypotheses generally are lacking. To evaluate whether foraging by caribou (Rangifer tarandus) was state-dependent, we compared bite and intake rates, travel rates, dietary quality, forage selection, daily foraging time, and foraging strategies of caribou with three levels of nutritional requirements (lactating adults, nonlactating adults, subadults 1–2 years old). Only daily foraging times and daily nutrient intakes differed among nutritional classes of caribou. Lactating caribou foraged longer per day than nonlactating caribou—a difference that was greatest at the highest rates of intake, but which persisted even when intake was below requirements. Further, at sites where caribou achieved high rates of intake, caribou in each nutritional class continued foraging even after satisfying daily nutritional requirements, which was consistent with a foraging strategy to maximize energy intake. Foraging time by caribou was partially state-dependent, highlighting the importance of accounting for physiological state in studies of animal behavior. Fine-scale foraging behaviors may influence larger-scale behavioral strategies, with potential implications for conservation and management. |
author2 |
Kristin Denryter Rachel C. Cook John G. Cook Katherine L. Parker Michael P. Gillingham |
format |
Text |
author |
Kristin Denryter Rachel C. Cook John G. Cook Katherine L. Parker Michael P. Gillingham |
spellingShingle |
Kristin Denryter Rachel C. Cook John G. Cook Katherine L. Parker Michael P. Gillingham State-dependent foraging by caribou with different nutritional requirements |
author_facet |
Kristin Denryter Rachel C. Cook John G. Cook Katherine L. Parker Michael P. Gillingham |
author_sort |
Kristin Denryter |
title |
State-dependent foraging by caribou with different nutritional requirements |
title_short |
State-dependent foraging by caribou with different nutritional requirements |
title_full |
State-dependent foraging by caribou with different nutritional requirements |
title_fullStr |
State-dependent foraging by caribou with different nutritional requirements |
title_full_unstemmed |
State-dependent foraging by caribou with different nutritional requirements |
title_sort |
state-dependent foraging by caribou with different nutritional requirements |
publisher |
American Society of Mammalogists |
publishDate |
2020 |
url |
https://doi.org/10.1093/jmammal/gyaa003 |
op_coverage |
world |
genre |
caribou Rangifer tarandus |
genre_facet |
caribou Rangifer tarandus |
op_source |
https://doi.org/10.1093/jmammal/gyaa003 |
op_relation |
doi:10.1093/jmammal/gyaa003 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1093/jmammal/gyaa003 |
container_title |
Journal of Mammalogy |
container_volume |
101 |
container_issue |
2 |
container_start_page |
544 |
op_container_end_page |
557 |
_version_ |
1800750045617717248 |