| Titre : | Nestmate killing by obligate brood parasitic chicks: is this linked to obligate siblicidal behavior? |
| Auteurs : | Ning Wang, Auteur ; Rebecca T. Kimball, Auteur |
| Type de document : | Article |
| Dans : | Journal of Ornithology (153(3) JUL 2012) |
| Article en page(s) : | 825-831 |
| Langues: | Anglais |
| Résumé : | The remarkable phenomenon of nestmate killing behavior among some birds that are obligate brood parasites (OBP) has fascinated scientific researchers for hundreds of years. This "nestmate-cide" behavior has been found in two clades of OBP birds (most OBP cuckoos and all the parasitic honeyguides), though it is absent in parasitic Clamator cuckoos, viduid finches, cowbirds, and the single parasitic duck. Several hypotheses have been developed to explain the existence of nestmate toleraters, including recent acquisition of OBP and insufficient time to evolve nestmate killing behavior, parasitizing a host with a brood reducers strategy, or the occurrence of high costs for killing nestmates. However, none of these hypotheses have provided a complete explanation for the origin of chick killing behavior in OBP birds and its "fixed" distribution pattern within certain clades. There are similarities in the process and consequences of nestmate killing behavior in obligate brood parasites with that of obligate siblicidal behavior. After mapping these two behaviors on recent avian phylogenies, we found that the two clades of brood parasites that exhibit nestmate killing behavior are both within larger clades that contain species with obligate siblicidal behavior. Since no previous studies have considered the potential linkage between obligate siblicidal behavior and parasitic chick killing behavior, we proposed that the evolution of the potential for siblicide may also result in the potential for parasitic chicks to kill nestmates, and that siblicidal behavior may even promote the origin of this "killing-type" OBP. |
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