La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Food cues and gonadal development in neotropical spotted antbirds (Hylophylax naevioides)
Auteurs :	S. O'Brien, Auteur ; M. Hau, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (146(4) OCT 2005)
Article en page(s) :	332-337
Langues:	Anglais
Résumé :	Most temperate-zone birds live in environments with a regular seasonality, and primarily use the long-term changes in photoperiod as a cue to initiate gonadal development in anticipation of the breeding season. Short-term cues such as food and temperature are later used to fine-tune the rate of gonadal development to local conditions. Many tropical habitats are seasonal, but the timing of the seasons (e.g., rainy season) can vary considerably between years. We hypothesize that to time breeding in environments with seasonal variability, tropical birds respond to both long-term and short-term environmental cues to initiate gonadal growth. We tested the effectiveness of photoperiod and food cues for the initiation of gonad growth in captive male spotted antbirds (Hylophylax n. naevioides) from Panama. A 'control' group was maintained on the short natural photoperiod of 12 h light and 12 h dark (LD 12:12) and adequate food. A 'food-stimulated' group was also held on

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