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Heydon, M.J., Loudon, A.S.I., Milne, J.A. and Brinklow, B.R. (1992) Influence of plane of nutrition on seasonal changes in food intake and reproduction of grazing red deer. In: Brown, R.D., Ed., The Biology of Deer, Springer-Verlag, New York, 279-284. doi:10.1007/978-1-4612-2782-3_62

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• TITLE: What elk, wolves and caterpillars have in common—The perfect forager theorem

  AUTHORS: Piotr Weclaw, Robert J. Hudson

  KEYWORDS: Resource Optimization; Optimal Use of Resources; Optimal Foraging; Perfect Forager Theorem; Functional Response Curve; Ecological Modeling; Marginal Value Theorem; Foraging Behaviour; Computer Model; SeekSMART

  JOURNAL NAME: Open Journal of Ecology, Vol.3 No.2, May 13, 2013

  ABSTRACT: It is widely accepted that the Marginal Value Theorem (MVT) describes optimal foraging strategies of animals and the mechanism proposed by the MVT has been supported by a number of field observations. However, findings of many researchers indicate that in natural conditions foragers do not always behave according to the MVT. To address this inconsistency, in a series of computer simulation experiments, we examined the behaviour of four types of foragers having specific foraging efficiencies and using the MVT strategies in 15 different landscapes in an ideal environment (no intra-and inter-specific interactions). We used data on elk (Cervus elaphus) to construct our virtual forager. Contrary to the widely accepted understanding of the MVT (residence time in a patch should be longer in environments where travel time between patches is longer) we found that in environments with the same average patch quality and varying average travel times between patches, patch residence times of some foragers are not affected by travel times. Based on our analysis we propose a mechanism responsible for this observation and formulate the perfect forager theorem (PFT). We also introduce the concepts of a foraging coefficient (F) and foragers’ hub (α), and propose a model to describe the relationship between the perfect forager and all other forager types.