PATERNITY PROTECTION CAN PROVIDE A KICK‐START FOR THE EVOLUTION OF MALE‐ONLY PARENTAL CARE
Identifieur interne : 000135 ( Main/Exploration ); précédent : 000134; suivant : 000136PATERNITY PROTECTION CAN PROVIDE A KICK‐START FOR THE EVOLUTION OF MALE‐ONLY PARENTAL CARE
Auteurs : Andrew T. Kahn [Australie] ; Lisa E. Schwanz [Australie] ; Hanna Kokko [Australie]Source :
- Evolution [ 0014-3820 ] ; 2013-08.
Abstract
Sperm competition and uncertainty of paternity hamper the evolution of male parental care. Thus, maternal care predominates in most taxa. What if males can, however, limit cuckoldry by guarding the eggs postmating? Here, we show that this provides a reason to reconsider an old and nowadays rather discredited hypothesis: that external fertilization is associated with male care because the parent who releases its gametes first can depart leaving the other in a “cruel bind,” having to care for the offspring. In our model, protection of paternity provides an additional incentive for the male to stay associated with its young. When we then assume that offspring survive better if guarded, paternity protection proves enough to kick‐start the evolution of male‐only parental care from a scenario with no care. This fits with data from fishes, where male‐only care is associated with external fertilization, whereas female‐only care almost always evolves after an initial transition to internal fertilization. Our model unifies disparate hypotheses regarding parental care roles and provides support for the idea that care roles can be influenced by sex differences in selection to be physically close to the offspring, including selection that is initially not based on offspring survival.
Url:
DOI: 10.1111/evo.12103
Affiliations:
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Thus, maternal care predominates in most taxa. What if males can, however, limit cuckoldry by guarding the eggs postmating? Here, we show that this provides a reason to reconsider an old and nowadays rather discredited hypothesis: that external fertilization is associated with male care because the parent who releases its gametes first can depart leaving the other in a “cruel bind,” having to care for the offspring. In our model, protection of paternity provides an additional incentive for the male to stay associated with its young. When we then assume that offspring survive better if guarded, paternity protection proves enough to kick‐start the evolution of male‐only parental care from a scenario with no care. This fits with data from fishes, where male‐only care is associated with external fertilization, whereas female‐only care almost always evolves after an initial transition to internal fertilization. Our model unifies disparate hypotheses regarding parental care roles and provides support for the idea that care roles can be influenced by sex differences in selection to be physically close to the offspring, including selection that is initially not based on offspring survival.</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Kahn, Andrew T" sort="Kahn, Andrew T" uniqKey="Kahn A" first="Andrew T." last="Kahn">Andrew T. Kahn</name></noRegion><name sortKey="Kahn, Andrew T" sort="Kahn, Andrew T" uniqKey="Kahn A" first="Andrew T." last="Kahn">Andrew T. Kahn</name><name sortKey="Kokko, Hanna" sort="Kokko, Hanna" uniqKey="Kokko H" first="Hanna" last="Kokko">Hanna Kokko</name><name sortKey="Schwanz, Lisa E" sort="Schwanz, Lisa E" uniqKey="Schwanz L" first="Lisa E." last="Schwanz">Lisa E. Schwanz</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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