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|Title: ||Why do top predators engage in superpredation? FRom an empirical scenario to a theoretical framework|
|Authors: ||Lourenço, Rui|
Delgado, Maria del Mar
Rabaça, João E.
|Keywords: ||Competitive kiling|
|Issue Date: ||2018|
|Citation: ||Lourenço, R., Delgado, M. del M., Campioni, L., Goytre, F., Rabaça, J.E., Korpimäki, E. & Penteriani, V. 2018. Why do top predators engage in superpredation? From na empirical scenario to a theoretical framework. Oikos, 127: 1563-1574.|
|Abstract: ||Lethal interactions can shape ecosystem structure, and consequently understanding their causes is ecologically relevant. To improve both empirical and theoretical knowledge on superpredation (i.e. predation on high-order predators), we studied an eagle owl population, including its main prey and mesopredators, and then we crossed these results with existing theories to provide a reasoning framework. We ftted our feld data into four main causes explaining lethal interactions: food stress, opportunistic superpredation, removal of a
competitor, and removal of a potential threat. Empirically, superpredation seemed to be mostly determined by the combination of the food-stress and opportunistic-superpredation hypotheses, which highlights the complexity of the factors triggering superpredation.
Therefore, besides being a response to lower food availability, superpredation may also
represent an eﬀective mechanism to remove potential predators and/or competitors, either intentionally or not. Our theoretical framework focused on the decision-making process in superpredation, considering four inter-related stages: encountering; attacking; and capturing a mesopredator; as well as consuming a mesopredator once killed. Superpredation almost certainly results from a complex process of decision-making, accounting for costs and benefts assessed moment-to-moment and for each mesopredator individual. It is
time to build bridges between theoretical and empirical studies to further understand the mechanisms driving complex interactions among top predators and mesopredators.|
|URI: ||doi: 10.1111/oik.05118|
|Appears in Collections:||MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
BIO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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