The importance of motivation, weapons, and foul odors in driving encounter competition in carnivores

Encounter competition is interference competition in which animals directly contend for resources. Ecological theory predicts the trait that determines the resource holding potential (RHP), and hence the winner of encounter competition, is most often body size or mass. The difficulties of observing...

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Bibliographic Details
Published in:Ecology (Durham) 2016-08, Vol.97 (8), p.1905-1912
Main Authors: Allen, Maximilian L., Wilmers, Christopher C., Elbroch, L. Mark, Golla, Julie M., Wittmer, Heiko U.
Format: Article
Language:English
Subjects:
Animal behavior
California
Carnivores
carrion
encounter competition
foraging arenas
interference competition
interspecific interactions
Lynx rufus
mesocarnivore
Motivation
Odors
Spilogale
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Summary:Encounter competition is interference competition in which animals directly contend for resources. Ecological theory predicts the trait that determines the resource holding potential (RHP), and hence the winner of encounter competition, is most often body size or mass. The difficulties of observing encounter competition in complex organisms in natural environments, however, has limited opportunities to test this theory across diverse species. We studied the outcome of encounter competition contests among mesocamivores at deer carcasses in California to determine the most important variables for winning these contests. We found some support for current theory in that body mass is important in determining the winner of encounter competition, but we found that other factors including hunger and species-specific traits were also important. In particular, our top models were "strength and hunger" and "size and hunger," with models emphasizing the complexity of variables influencing outcomes of encounter competition. In addition, our wins above predicted (WAP) statistic suggests that an important aspect that determines the winner of encounter competition is species-specific advantages that increase their RHP, as bobcats (Lynx rufus) and spotted skunks (Spilogale gracilis) won more often than predicted based on mass. In complex organisms, such as mesocamivores, species-specific adaptations, including strategic behaviors, aggressiveness, and weapons, contribute to competitive advantages and may allow certain species to take control or defend resources better than others. Our results help explain how interspecific competition shapes the occurrence patterns of species in ecological communities.
ISSN:0012-9658
1939-9170
DOI:10.1002/ecy.1462