Effects of group composition on the grazing behaviour of herbivores

LA Smith, KL Wells, G Marion, DL Swan, MR Hutchings

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

Animal behaviour is often a function of the animal’s physiological state. Groups of animals will often contain individuals with a range of physiological states and the grazing behaviour of herbivores is affected by their physiological state. This study compared the grazing decisions of animals in groups of single and mixed physiological states. Using a grazing model that simulated individual herbivore behaviour in relation to environmental distributions of forage resource (grass) and parasites (faeces), we tested the hypothesis that an animal’s level of parasite exposure via the faecaleoral route is affected by the composition of physiological states in the group. Four physiological states were considered: parasitenaïve, parasitized, lactating and parasite-immune animals. Baseline parasite exposure levels for each state were generated by simulating single-state groups and were compared to simulations of each of the six two-state combinations. In single-state groups parasitized animals had the least and lactating animals had the greatest levels of parasite exposure. When co-grazing with lactating animals, parasitized, immune and naïve animals increased their parasite exposure, relative to single-state groups. When cograzing with parasitized animals, lactating, immune and naïve animals reduced their parasite exposure, relative to single-state groups. There was no difference in parasite exposure of the immune or naïve animals co-grazing together when compared to the single-state groups. These results highlight the need to recognize the impact of the individual when studying group-living animals. 2010 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)527 - 534
Number of pages8
JournalAnimal Behaviour
Volume80
Publication statusFirst published - 2010

Fingerprint

group effect
herbivores
grazing
physiological state
parasites
animals
animal behavior
feces
forage
grasses

Bibliographical note

66000008
66000009
521143

Keywords

  • Grazing
  • Group composition
  • Herbivore
  • Individual behaviour
  • Physiological state

Cite this

Smith, LA ; Wells, KL ; Marion, G ; Swan, DL ; Hutchings, MR. / Effects of group composition on the grazing behaviour of herbivores. In: Animal Behaviour. 2010 ; Vol. 80. pp. 527 - 534.
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Effects of group composition on the grazing behaviour of herbivores. / Smith, LA; Wells, KL; Marion, G; Swan, DL; Hutchings, MR.

In: Animal Behaviour, Vol. 80, 2010, p. 527 - 534.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Wells, KL

AU - Marion, G

AU - Swan, DL

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AB - Animal behaviour is often a function of the animal’s physiological state. Groups of animals will often contain individuals with a range of physiological states and the grazing behaviour of herbivores is affected by their physiological state. This study compared the grazing decisions of animals in groups of single and mixed physiological states. Using a grazing model that simulated individual herbivore behaviour in relation to environmental distributions of forage resource (grass) and parasites (faeces), we tested the hypothesis that an animal’s level of parasite exposure via the faecaleoral route is affected by the composition of physiological states in the group. Four physiological states were considered: parasitenaïve, parasitized, lactating and parasite-immune animals. Baseline parasite exposure levels for each state were generated by simulating single-state groups and were compared to simulations of each of the six two-state combinations. In single-state groups parasitized animals had the least and lactating animals had the greatest levels of parasite exposure. When co-grazing with lactating animals, parasitized, immune and naïve animals increased their parasite exposure, relative to single-state groups. When cograzing with parasitized animals, lactating, immune and naïve animals reduced their parasite exposure, relative to single-state groups. There was no difference in parasite exposure of the immune or naïve animals co-grazing together when compared to the single-state groups. These results highlight the need to recognize the impact of the individual when studying group-living animals. 2010 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.

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