Herbivore body condition response in altered environments: mule deer and habitat management

The relationships between habitat, body condition, life history characteristics, and fitness components of ungulates are interwoven and of interest to researchers as they strive to understand the impacts of a changing environment. With the increased availability of portable ultrasound machines and t...

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Bibliographic Details
Published in:PloS one 2014-09, Vol.9 (9), p.e106374
Main Authors: Bergman, Eric J, Doherty, Jr, Paul F, Bishop, Chad J, Wolfe, Lisa L, Banulis, Bradley A
Format: Article
Language:English
Subjects:
Adipose Tissue
Animal behavior
Animals
Babyrousa babyrussa
Biocompatibility
Biology and Life Sciences
Biomedical materials
Body fat
Chemical control
Deer
Deer - genetics
Deer - physiology
Ecology and Environmental Sciences
Ecosystem
Environmental changes
Environmental impact
Environmental management
Environmental monitoring
Estimates
Female
Fitness
Genetic Fitness - genetics
Genetic Fitness - physiology
Habitats
Herbivory - genetics
Herbivory - physiology
Hormones
Juniperus occidentalis
Life history
Machinery condition monitoring
Male
Odocoileus
Pregnancy
Thyroid
Thyroid hormones
Thyroid Hormones - blood
Ultrasound
Ungulates
Variation
Wildlife management
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Summary:The relationships between habitat, body condition, life history characteristics, and fitness components of ungulates are interwoven and of interest to researchers as they strive to understand the impacts of a changing environment. With the increased availability of portable ultrasound machines and the refinement of hormonal assays, assessment of ungulate body condition has become an accessible monitoring strategy. We employed body condition scoring, estimation of % ingesta-free body fat (%IFBF), assessment of free thyroid hormones (FT4 and FT3), and assessment of pregnancy, as metrics to determine if landscape-level habitat treatments affected body condition of adult (≥ 1.5 years old) female mule deer (Odocoileus hemionus). All body condition related metrics were measured on 2 neighboring study areas--a reference area that had received no habitat treatments and a treatment study area that had received mechanical removal of pinyon pine (Pinyus edulis)--Utah juniper (Juniperus osteosperma) forest, chemical control of weeds, and reseeding with preferred mule deer browse species. A consistent trend of higher %IFBF was observed in the treatment study area [Formula: see text] than in the reference study area [Formula: see text], although variation of estimates was larger than hypothesized. A similar pattern was observed with higher thyroid hormones concentrations being observed in the treatment study area, but large amounts of variation within concentration estimates were also observed. The consistent pattern of higher body condition related estimates in our treatment study area provides evidence that large mammalian species are sensitive to landscape change, although variation within estimates underlie the challenge in detecting population level impacts stemming from environmental change.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0106374