4.5 Article

Allometric scaling of resource acquisition by ruminants in dynamic and heterogeneous environments

Journal

ECOLOGICAL MODELLING
Volume 221, Issue 21, Pages 2555-2564

Publisher

ELSEVIER
DOI: 10.1016/j.ecolmodel.2010.07.012

Keywords

Herbivore-vegetation interaction; Spatial heterogeneity; Allometric scaling; Functional response; Patch departure rules; Vegetation dynamics

Categories

Funding

  1. Knowledge Base of the Dutch Ministry of Agriculture, Nature and Food Quality [KB-01-007-004]

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We present a mechanistic formulation of the intake response of ruminants to vegetation biomass based solely on physiological and morphological parameters that scale allometrically with the animal's body mass. The model is applied to describe herbivore-vegetation interactions in dynamic and heterogeneous landscapes with low quality but abundant tall grass and high quality but sparsely available short grass, under two conditions: uncoupled (such that the effect of food intake on vegetation biomass can be neglected), or coupled (such that the vegetation biomass is determined by herbivore feeding). The results show that under uncoupled conditions, the minimum acceptance (proportion of vegetation consumed by the herbivore) at which the herbivore can leave its current patch without reducing its intake rate is when it has depleted the current patch by the energetic cost required to travel to another patch. The maximum acceptance at which the herbivore should leave its patch is when it has depleted the current patch by the cumulative energetic cost of traveling, handling, cropping, and digesting. Under coupled conditions, the optimal acceptance equals half the relative growth rate of the vegetation. Analytical solutions are obtained for equilibrium values for utilization of the vegetation, and for the densities of vegetation and ruminants, expressed in physiological and morphological herbivore parameters. (C) 2010 Elsevier B.V. All rights reserved.

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