Kin selection and reciprocation of biological services are distinct theories invoked to explain the origin and evolutionary maintenance of altruistic and cooperative behaviors. Although these behaviors are not considered to be mutually exclusive, the costbenefit balance of behaving altruistically or cooperating reciprocally and the conditions promoting a switch between such different strategies have rarely been tested. Here, we examine the association between allofeeding, allopreening, and vocal solicitations in wild barn owl (Tyto alba) broods under different food abundance conditions: natural food provisioning and after an experimental food supplementation. Allofeeding was performed mainly by elder nestlings (hatching is asynchronous) in prime condition, especially when the cost of forgoing a prey was small (when parents allocated more prey to the food donor and after food supplementation). Nestlings preferentially shared food with the siblings that emitted very intense calls, thus potentially increasing indirect fitness benefits, or with the siblings that provided extensive allopreening to the donor, thus possibly promoting direct benefits from reciprocation. Finally, allopreening was mainly directed toward older siblings, perhaps to maximize the probability of being fed in return. Helping behavior among relatives can therefore be driven by both kin selection and direct cooperation, although it is dependent on the contingent environmental conditions.
Elder barn owl nestlings flexibly redistribute parental food according to siblings’ need or in return for allopreening / P. Ducouret, A. Romano, A.N. Dreiss, P. Marmaroli, X. Falourd, M. Bincteux, A. Roulin. - In: THE AMERICAN NATURALIST. - ISSN 0003-0147. - 196:2(2020 Aug 01), pp. 257-269.
|Titolo:||Elder barn owl nestlings flexibly redistribute parental food according to siblings’ need or in return for allopreening|
ROMANO, ANDREA (Secondo)
|Parole Chiave:||Biological market; Conflict resolution; Direct cooperation; Kin selection; Sibling cooperation; Sibling negotiation|
|Settore Scientifico Disciplinare:||Settore BIO/07 - Ecologia|
|Data di pubblicazione:||1-ago-2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1086/709106|
|Appare nelle tipologie:||01 - Articolo su periodico|