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1 July 2001 AGE RATIOS AND RETURN RATES OF ADULT MALE OVENBIRDS IN CONTIGUOUS AND FRAGMENTED FORESTS
Dawn Burke, Erica Nol
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Abstract

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 not 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 contiguous forest in 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.

Dawn Burke and Erica Nol "AGE RATIOS AND RETURN RATES OF ADULT MALE OVENBIRDS IN CONTIGUOUS AND FRAGMENTED FORESTS," Journal of Field Ornithology 72(3), 433-438, (1 July 2001). https://doi.org/10.1648/0273-8570-72.3.433
Received: 18 April 2000; Accepted: 1 November 2000; Published: 1 July 2001
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