Body size and digestive system shape resource selection by ungulates : A cross-taxa test of the forage maturation hypothesis

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2021
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Esmaeili, Saeideh
Jesmer, Brett R.
Albeke, Shannon E.
Schoenecker, Kathryn A.
King, Sarah R. B.
Abrahms, Briana
Buuveibaatar, Bayarbaatar
Beck, Jeffrey L.
Boone, Randall B.
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The forage maturation hypothesis (FMH) states that energy intake for ungulates is maximised when forage biomass is at intermediate levels. Nevertheless, metabolic allometry and different digestive systems suggest that resource selection should vary across ungulate species. By combining GPS relocations with remotely sensed data on forage characteristics and surface water, we quantified the effect of body size and digestive system in determining movements of 30 populations of hindgut fermenters (equids) and ruminants across biomes. Selection for intermediate forage biomass was negatively related to body size, regardless of digestive system. Selection for proximity to surface water was stronger for equids relative to ruminants, regardless of body size. To be more generalisable, we suggest that the FMH explicitly incorporate contingencies in body size and digestive system, with small-bodied ruminants selecting more strongly for potential energy intake, and hindgut fermenters selecting more strongly for surface water.

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570 Biowissenschaften, Biologie
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Equidae, forage biomass, hindgut fermentation, macroecology, ruminant, step-selection function, water requirements
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ISO 690ESMAEILI, Saeideh, Brett R. JESMER, Shannon E. ALBEKE, Ellen O. AIKENS, Kathryn A. SCHOENECKER, Sarah R. B. KING, Briana ABRAHMS, Bayarbaatar BUUVEIBAATAR, Jeffrey L. BECK, Randall B. BOONE, 2021. Body size and digestive system shape resource selection by ungulates : A cross-taxa test of the forage maturation hypothesis. In: Ecology Letters. Wiley. 2021, 24(10), pp. 2178-2191. ISSN 1461-023X. eISSN 1461-0248. Available under: doi: 10.1111/ele.13848
BibTex
@article{Esmaeili2021-07-26diges-56000,
  year={2021},
  doi={10.1111/ele.13848},
  title={Body size and digestive system shape resource selection by ungulates : A cross-taxa test of the forage maturation hypothesis},
  number={10},
  volume={24},
  issn={1461-023X},
  journal={Ecology Letters},
  pages={2178--2191},
  author={Esmaeili, Saeideh and Jesmer, Brett R. and Albeke, Shannon E. and Aikens, Ellen O. and Schoenecker, Kathryn A. and King, Sarah R. B. and Abrahms, Briana and Buuveibaatar, Bayarbaatar and Beck, Jeffrey L. and Boone, Randall B.}
}
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