Populations of a cyprinid fish are self-sustaining despite widespread feminization of males.
Populations of a cyprinid fish are self-sustaining despite widespread feminization of males.
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DOI：
10.1186/1741-7007-12-1
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发表时间：
2014-01-13
期刊：
影响因子：
5.4
通讯作者：
Tyler CR
中科院分区：
文献类型：
--
作者：
Hamilton PB;Nicol E;De-Bastos ES;Williams RJ;Sumpter JP;Jobling S;Stevens JR;Tyler CR
在发达国家，废水处理厂处理后的污水可能占河流流量的很大比例。暴露在这些流出物或它们所含的类固醇雌激素中，会使野生雄鱼雌性化，并可能降低它们的繁殖适合性。长期的实验性暴露已经导致性别比例的扭曲，繁殖群体的繁殖失败，以及种群崩溃。这表明，环境雌激素可能会威胁到野生鱼类种群的可持续性。在这里，我们通过检测野生蟑螂(Rutilus rutilus L.)的种群遗传结构和有效种群数量(Ne)来检验这一假说。生活在被雌激素排泄物污染的英国河流中。使用近似贝叶斯计算和兄弟姐妹分配方法，根据DNA微卫星基因型别估计NE。我们在28个样本点没有发现NE与预测的雌激素暴露之间存在显著的负相关。此外，对该区域蟑螂种群遗传结构的研究表明，一些种群多代以来一直被限制在雌激素流出物比例较高的河段，并存活了下来，显然不依赖于从污染较少的地点迁徙鱼类。这些结果表明，生活在污水污染河段的蟑螂种群是自我维持的，那里女性化现象普遍存在。尽管我们没有发现证据表明暴露在雌激素排放物中是决定蟑螂繁殖种群大小的一个重要驱动因素，但对于污染最严重的地点，由于与统计模型相关的宽可信区间，Ne仍有可能减少高达65%。
Treated effluents from wastewater treatment works can comprise a large proportion of the flow of rivers in the developed world. Exposure to these effluents, or the steroidal estrogens they contain, feminizes wild male fish and can reduce their reproductive fitness. Long-term experimental exposures have resulted in skewed sex ratios, reproductive failures in breeding colonies, and population collapse. This suggests that environmental estrogens could threaten the sustainability of wild fish populations. Here we tested this hypothesis by examining population genetic structures and effective population sizes (Ne) of wild roach (Rutilus rutilus L.) living in English rivers contaminated with estrogenic effluents. Ne was estimated from DNA microsatellite genotypes using approximate Bayesian computation and sibling assignment methods. We found no significant negative correlation between Ne and the predicted estrogen exposure at 28 sample sites. Furthermore, examination of the population genetic structure of roach in the region showed that some populations have been confined to stretches of river with a high proportion of estrogenic effluent for multiple generations and have survived, apparently without reliance on immigration of fish from less polluted sites. These results demonstrate that roach populations living in some effluent-contaminated river stretches, where feminization is widespread, are self-sustaining. Although we found no evidence to suggest that exposure to estrogenic effluents is a significant driving factor in determining the size of roach breeding populations, a reduction in Ne of up to 65% is still possible for the most contaminated sites because of the wide confidence intervals associated with the statistical model.
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影响因子：
10.4
作者：
Filby AL;Neuparth T;Thorpe KL;Owen R;Galloway TS;Tyler CR
通讯作者：
Tyler CR
影响因子：
4.9
作者：
Corander, Jukka;Majander, Kerttu K.;Merila, Juha
通讯作者：
Merila, Juha
影响因子：
11.4
作者：
Green, Christopher;Williams, Richard;Jobling, Susan
通讯作者：
Jobling, Susan
DOI：
10.1073/pnas.172242899
发表时间：
2002-09-03
影响因子：
11.1
作者：
Hauser, L;Adcock, GJ;Carvalho, GR
通讯作者：
Carvalho, GR
影响因子：
10.4
作者：
Harris CA;Hamilton PB;Runnalls TJ;Vinciotti V;Henshaw A;Hodgson D;Coe TS;Jobling S;Tyler CR;Sumpter JP
通讯作者：
Sumpter JP