کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9113301 | 1156223 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Endocrine correlates of the breeding asynchrony between two corsican populations of blue tits (Parus caeruleus)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
علوم غدد
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![عکس صفحه اول مقاله: Endocrine correlates of the breeding asynchrony between two corsican populations of blue tits (Parus caeruleus) Endocrine correlates of the breeding asynchrony between two corsican populations of blue tits (Parus caeruleus)](/preview/png/9113301.png)
چکیده انگلیسی
Analyses of the development of the reproductive system in seasonally breeding birds in the framework of long-term ecological studies are rare. Here, we present the first results of such a study in two Corsican populations of a European passerine bird, the blue tit (Parus caeruleus). The two study populations occupy different oak habitats and are separated by only 25Â km. Despite their close proximity, they show a one-month difference in onset of egg laying, even after controlling for altitude. This micro-geographic difference in breeding date appears adaptive because both study populations raise chicks when food is most plentiful. In our study, males reached their maximum song activity during the egg-laying stage while maximal testosterone levels and testes sizes were reached 2-3 weeks before egg laying. The rate of development of the reproductive system in males was much faster in the earlier population, in spite of a similar onset of gonad development and song activity for the two study populations. No change in the volume of the song-control nuclei (HVC and RA) could be detected during the study period. Development of brain nuclei was completed 2-3 months before the beginning of intense sexual activity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: General and Comparative Endocrinology - Volume 140, Issue 1, 1 January 2005, Pages 52-60
Journal: General and Comparative Endocrinology - Volume 140, Issue 1, 1 January 2005, Pages 52-60
نویسندگان
Samuel P. Caro, Jacques Balthazart, Donald W. Thomas, André Lacroix, Olivier Chastel, Marcel M. Lambrechts,