Foraging investment in a long-lived herbivore and vulnerability to coursing and stalking predators

David A Christianson, Matthew S. Becker, Angela Brennan, Scott Creel, Egil Dröge, Jassiel M'soka, Teddy Mukula, Paul Schuette, Daan Smit, Fred Watson

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Allocating resources to growth and reproduction requires grazers to invest time in foraging, but foraging promotes dental senescence and constrains expression of proactive antipredator behaviors such as vigilance. We explored the relationship between carnivore prey selection and prey foraging effort using incisors collected from the kills of coursing and stalking carnivores. We predicted that prey investing less effort in foraging would be killed more frequently by coursers, predators that often exploit physical deficiencies. However, such prey could expect delayed dental senescence. We predicted that individuals investing more effort in foraging would be killed more frequently by stalkers, predators that often exploit behavioral vulnerabilities. Further these prey could expect earlier dental senescence. We tested these predictions by comparing variation in age-corrected tooth wear, a proxy of cumulative foraging effort, in adult (3.4–11.9 years) wildebeest killed by coursing and stalking carnivores. Predator type was a strong predictor of age-corrected tooth wear within each gender. We found greater foraging effort and earlier expected dental senescence, equivalent to 2.6 additional years of foraging, in female wildebeest killed by stalkers than in females killed by coursers. However, male wildebeest showed the opposite pattern with the equivalent of 2.4 years of additional tooth wear in males killed by coursers as compared to those killed by stalkers. Sex-specific variation in the effects of foraging effort on vulnerability was unexpected and suggests that behavioral and physical aspects of vulnerability may not be subject to the same selective pressures across genders in multipredator landscapes.

Original languageEnglish (US)
JournalEcology and Evolution
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

senescence
herbivore
vulnerability
herbivores
carnivore
foraging
predator
tooth
predators
wildebeest
gender
teeth
carnivores
prey selection
vigilance
resource
prediction

Keywords

  • courser
  • foraging
  • incisor
  • senescence
  • stalker
  • tooth wear

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

Cite this

Foraging investment in a long-lived herbivore and vulnerability to coursing and stalking predators. / Christianson, David A; Becker, Matthew S.; Brennan, Angela; Creel, Scott; Dröge, Egil; M'soka, Jassiel; Mukula, Teddy; Schuette, Paul; Smit, Daan; Watson, Fred.

In: Ecology and Evolution, 01.01.2018.

Research output: Contribution to journalArticle

Christianson, DA, Becker, MS, Brennan, A, Creel, S, Dröge, E, M'soka, J, Mukula, T, Schuette, P, Smit, D & Watson, F 2018, 'Foraging investment in a long-lived herbivore and vulnerability to coursing and stalking predators', Ecology and Evolution. https://doi.org/10.1002/ece3.4489
Christianson, David A ; Becker, Matthew S. ; Brennan, Angela ; Creel, Scott ; Dröge, Egil ; M'soka, Jassiel ; Mukula, Teddy ; Schuette, Paul ; Smit, Daan ; Watson, Fred. / Foraging investment in a long-lived herbivore and vulnerability to coursing and stalking predators. In: Ecology and Evolution. 2018.
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