La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Age ratios and return rates of adult male Ovenbirds in contiguous and fragmented forests
Auteurs :	D. Burke, Auteur ; E. Nol, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (72(3) SUM 2001)
Article en page(s) :	433-438
Langues:	Anglais
Résumé :	We determined proportions and return rates of yearling and older territorial male Ovenbirds (Seiurus aurocapillus) in 12 forest fragments and two contiguous forest sites in southern Ontario to, test the hypothesis that a larger proportion of second-year birds occupied forest fragments. There was no significant difference in the proportion of yearling birds among small, large and contiguous forests (small, 54.0%; large, 54.3%; contiguous, 44.9%). Return rates did nor vary among fragment size categories (small, 34.4% large, 35.7%; contiguous, 42.8%). Males in small fragments did not differ significantly from those in large fragments or cr,contiguous forest ill mass, wing length, or a condition index. Males also did not vary in these characteristics between age groups. These results suggest that male Ovenbirds in our study area do not occupy sites in proportion to their quality as breeding locations.

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