1995-2005年，Uppland Angarnsjängen春季爆破Anas准坡的性别分布

Q4 Agricultural and Biological Sciences

Ornis Svecica Pub Date : 2007-10-01 DOI:10.34080/os.v17.22682

Svante Söderholm

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引用次数: 0

摘要

研究了在瑞典Angarnsjöängen(59°33′n, 18°10′e) 11次春季迁徙期间欧亚小䴙䴘的性别比及其季节变化。4月下半月是鸟类的主要迁徙期，5月15日后基本停止迁徙。在此之后记录的欧亚威根鸟主要是雄性，可能大多数是不繁殖的，换毛的迁徙者或掉队者。男性占比为0.53 (SD=0.028)，年龄间差异无统计学意义。雄鸟的比例和鸟群规模之间也没有相关性。在中途停留期间，大约95%的雌性和85%的雄性是成对的。

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Könsfördelningen hos bläsand Anas penelope under vårsträcket vid Angarnsjöängen, Uppland, 1995—2005

The sex ratio of the Eurasian Wigeon Anas penelope and its seasonal variation was studied during eleven spring migrations at Angarnsjöängen, Sweden (59° 33'N, 18° 10'E). The main passage of birds occurred in the second half of April, and the migration had almost ceased after 15 May. Eurasian Wigeons recorded after this date were mainly males and probably mostly non-breeders, moult migrants or stragglers. The fraction of males was 0.53 (SD=0.028), and there was no difference between years. Neither was there a correlation between the fraction of males and the flock size. About 95% of the females and 85% of the males were paired during the stopover.

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来源期刊

Ornis Svecica Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

0.70

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0.00%

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