Manipulating sex ratio to increase population growth: the example of the Lesser Kestrel

Détails

ID Serval
serval:BIB_BC580C35AEFB
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Manipulating sex ratio to increase population growth: the example of the Lesser Kestrel
Périodique
Animal Conservation
Auteur⸱e⸱s
Lenz T. L., Jacob A., Wedekind C.
ISSN
1367-9430
Statut éditorial
Publié
Date de publication
2007
Peer-reviewed
Oui
Volume
10
Numéro
2
Pages
236-244
Langue
anglais
Notes
160JI
Résumé
Small or decreasing populations call for emergency actions like, for example, captive breeding programs. Such programs aim at rapidly increasing population sizes in order to reduce the loss of genetic variability and to avoid possible Allee effects. The Lesser Kestrel Falco naumanni is one of the species that is currently supported in several captive breeding programs at various locations. Here, we model the demographic and genetic consequences of potential management strategies that are based on offspring sex ratio manipulation. Increased population growth could be achieved by manipulating female conditions and/or male attractiveness in the captive breeders and consequently shifting the offspring sex ratio towards more female offspring, which are then used for reintroduction. Fragmenting populations into wild-breeding and captive-breeding demes and manipulating population sex ratio both immediately increase the inbreeding coefficient in the next generation (i.e. decrease N-e) but may, in the long term, reduce the loss of genetic variability if population growth is restricted by the number of females. We use the Lesser Kestrel and the wealth of information that is available on this species to predict the long-term consequences of various kinds of sex-ratio manipulation. We find that, in our example and possibly in many other cases, a sex-ratio manipulation that seems realistic could have a beneficial effect on the captive breeding program. However, the possible long-term costs and benefits of such measures need to be carefully optimized.
Mots-clé
captive breeding supplementary breeding population management trivers & willard hypothesis ryman-laikre effect allee effect DNA-fingerprinting reveals extra-pair paternity falco-naumanni captive populations plumage coloration female preference habitat selection american kestrels natural-selection foraging habitat
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Création de la notice
25/01/2008 10:43
Dernière modification de la notice
20/08/2019 15:30
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