Offspring sex ratio is unrelated to parental quality and time of breeding in a multiple-breeding shorebird
Offspring sex ratio is unrelated to parental quality and time of breeding in a multiple-breeding shorebird
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多重繁殖滨鸟的后代性别比与亲本质量和繁殖时间无关
DOI：
10.1007/s10336-018-1620-6
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发表时间：
2019-01
影响因子：
1.3
通讯作者：
Zhang Zhengwang
中科院分区：
文献类型：
--
作者：
Que Pinjia;Szekely Tamas;Wang Pengcheng;Lu Qi;Lei Weipan;Liu Yang;Zhang Zhengwang
性别比例是进化生物学中的一个基本概念，理论预测父母应该根据他们期望从儿子和女儿身上获得的健康回报来投资。健身回报可能取决于育种的时机和父母的条件，导致性别比例取决于育种日期和/或父母的质量。本研究在中国东部一个大型繁殖群体中调查了小滨鹬（Kentish PloverCharadrius alexandrinus）后代的性比，并检验了父母是否会根据孵化期、育雏日龄和自身身体状况来调整后代的性别。使用1264小鸡从676窝分子性别，我们表明，孵化的性别比是没有显着不同的统一。孵出的幼体性别比与孵化日期和双亲的身体状况无关。此外，我们对从非法卵子收集者那里没收的138个卵子进行了性别鉴定，发现雌性和雄性胚胎的死亡率没有显著差异。后一个结果很重要，因为它表明，无论是初级性别比（即，在受孕时）或第二性比（即，在阴影处）是偏置的。两者合计，甚至后代的性别比例在中国肯特郡的Plovers是一致的，最近的分析发现，甚至在孵化时的性别比例。未来的工作应该调查是否甚至性别比例持续到成年，或它可能会转向更多的男性（或女性），由于青少年和/或成年人的性别偏见死亡率。
Sex ratio is a fundamental concept in evolutional biology, and theory predicts that parents should invest in sons and daughters according to the fitness returns they expect from them. The fitness returns may depend on the timing of breeding and on parental conditions leading to sex ratios that depend on breeding date and/or parental quality. Here, we investigate the offspring sex ratio in a small shorebird, the Kentish PloverCharadrius alexandrinus, in a large breeding population in Eastern China, and test whether the parents adjust their offspring’s sex in response to hatch date, brood age and their own body condition. Using 1264 chicks from 676 broods that were molecularly sexed, we show that hatchling sex ratio was not significantly different from unity. Hatchling sex ratios were not related to hatch date or to the body condition of parents. In addition, we sexed 138 eggs that were confiscated from illegal egg collectors and found that the mortality of female and male embryos was not significantly different. The latter result is important by suggesting that neither primary sex ratio (i.e., at conception) nor secondary sex ratio (i.e., at hatching) is biased. Taken together, the even offspring sex ratio in Chinese Kentish Plovers is consistent with recent analyses of six plover populations that found even sex ratios at hatching. Future works should investigate whether the even sex ratio persists into adulthood, or it may shift toward more males (or females) due to sex-biased mortalities of juveniles and/or adults.
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影响因子：
16.6
作者：
Eberhart-Phillips LJ;Küpper C;Carmona-Isunza MC;Vincze O;Zefania S;Cruz-López M;Kosztolányi A;Miller TEX;Barta Z;Cuthill IC;Burke T;Székely T;Hoffman JI;Krüger O
通讯作者：
Krüger O
DOI：
--
发表时间：
1996
期刊：
--
影响因子：
--
作者：
R. Fraga;J. Amat
通讯作者：
R. Fraga;J. Amat
影响因子：
1.7
作者：
C. M. Lessells;A. C. Mateman;J. Visser
通讯作者：
C. M. Lessells;A. C. Mateman;J. Visser
影响因子：
0.8
作者：
R. McIntosh;R. Kats;M. Berg;J. Komdeur;M. Elgar
通讯作者：
R. McIntosh;R. Kats;M. Berg;J. Komdeur;M. Elgar
影响因子：
2.1
作者：
A. Romano;M. Romano;M. Caprioli;A. Costanzo;M. Parolini;D. Rubolini;N. Saino
通讯作者：
A. Romano;M. Romano;M. Caprioli;A. Costanzo;M. Parolini;D. Rubolini;N. Saino