NDLI: Female age and breeding performance in a cyclic population of black grouse Tetrao tetrix

Content Provider	Scilit
Author	Marjakangas, Arto Törmälä, Laura
Copyright Year	1997
Description	Journal: Wildlife Biology The breeding performance in yearling and adult female black grouse Tetrao tetrix was studied in a 6–7 year cyclic population during 1989–93 in central Finland. Eighty yearlings and 108 adults, radio-marked in late winter, survived until the breeding season. Adults were larger, had more body mass at capture, initiated laying earlier and had larger eggs and clutches than yearlings. Yearlings and adults lost 11.8 and 20.9%, respectively, of their first nests to egg predators. Hatching dates and success of eggs were similar for both age classes. The proportion of females losing the entire brood was 32% for yearlings and 27.1% for adults. Brood size in late summer and number of chicks produced per female initiating breeding did not differ between age classes.
Ending Page	203
Starting Page	195
ISSN	00221295
e-ISSN	1903220X
DOI	10.2981/wlb.1997.024
Journal	Wildlife Biology
Issue Number	3-4
Volume Number	3
Language	English
Publisher	Wiley-Blackwell
Publisher Date	1997-12-01
Access Restriction	Open
Subject Keyword	Journal: Wildlife Biology Operations Research and Management Science
Content Type	Text
Resource Type	Article
Subject	Physiology

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Female age and breeding performance in a cyclic population of black grouse Tetrao tetrix