Great Tit hatchling sex ratios
Great Tit hatchling sex ratios
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DOI：
10.2307/3677142
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发表时间：
1996-06
影响因子：
1.7
通讯作者：
C. M. Lessells;A. C. Mateman;J. Visser
中科院分区：
文献类型：
--
作者：
C. M. Lessells;A. C. Mateman;J. Visser
采用PCR RAPD技术对大山雀雏鸟的性别进行了鉴定。由于这项技术需要微量的DNA，小鸡可以在孵化后不久（0- 2天），在任何雏鸟死亡发生之前取样。在102窝752只孵出的雏鸡中，雄鸡所占比例（98.9%）随孵出日期的增加而增加，从第一窝的42.4%（n=555）增加到第二窝的50.9%（n=167）。孵出的幼体中的男性比例也下降，增加窝卵数和增加孵化的孵化率。这三个变量是相互关联的，不可能在统计学上将它们分开。孵化的性别比与年龄，体重或翅长的父母，育雏大小在孵化或羽翼丰满，孵化或羽翼丰满的成功，平均小鸡体重，或在孵化序列中的位置不相关。发现的性别比例变化的功能意义尚不清楚。【关键词：红翅黑鹂;较小的雪雁;卵子序列; parus-major;季节变化;尺寸;标识;后果;死亡率;分散]
The sex of Great Tit Parus major nestlings was determined using PCR RAPDs. Because this technique requires minute amounts of DNA, chicks could be sampled soon (0-2d) after hatching, before any nestling mortality occurred. The proportion of males among 752 chicks hatching in 102 broods (98.9% of those that hatched) increased with hatching date from 42.4% male in first broods (n=555 chicks) to 50.9% male in second broods (n=167). The proportion of males among hatchlings also decreased with increasing clutch size and increased with increasing hatching asynchrony. These three variables are intercorrelated and it was not possible to separate them statistically. Hatchling sex ratio was not correlated with the age, weight or wing-length of either of the parents, brood size at hatching or fledging, hatching or fledging success, mean chick weight, or position in the hatching sequence. The functional significance of the sex ratio variation found is unknown. [KEYWORDS: Red-winged blackbirds; lesser snow geese; egg sequence; parus-major; seasonal-variation; size; identification; consequences; mortality; dispersal]