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首页> 外文期刊>Journal of Fish Biology >Absence of intrinsic post-zygotic incompatibilities in artificial crosses between sympatric coregonid species from upper Lake Constance
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Absence of intrinsic post-zygotic incompatibilities in artificial crosses between sympatric coregonid species from upper Lake Constance

机译：康斯坦茨湖上游同伴类生殖腺物种之间人工杂交的内在合子后不相容性缺乏

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摘要

A full factorial crossing experiment with five females and five males of each of two coregonid species from upper Lake Constance was used to test for intrinsic post-zygotic incompatibilities during early ontogeny. Up until shortly before hatching, there was no difference in embryo mortality between homo and heterologous crosses. A maternal effect on mortality was found in both species, but paternal effects and female-male interactions were absent. Thus, genetic incompatibility during early ontogeny does not appear to prevent introgressive hybridization, suggesting that genetic divergence between these species is maintained primarily by pre-zygotic barriers. The recent genetic homogenizations of coregonid species flocks in European alpine lakes may have been caused by a flattening of adaptive landscapes through eutrophication, but intensive stocking with larvae obtained in hatcheries from artificially fertilized eggs is also likely to be a contributing factor. To safeguard diversity among sympatric coregonids, it is important to re-establish ecological conditions conducive to species divergence and to revise traditional management strategies.
机译：使用来自康斯坦茨湖上层两种金线虫物种的五种雌性和五种雄性的全因子杂交实验来测试个体发育早期内在的合子后不相容性。直到孵化前不久，同源和异源杂交之间的胚胎死亡率都没有差异。在这两个物种中均发现了对死亡率的产妇效应，但没有父系效应和雌雄相互作用。因此，早期个体发育过程中的遗传不相容性似乎并未阻止渐渗杂交，这表明这些物种之间的遗传差异主要是由合子前屏障维持的。欧洲高山湖泊中金线虫种群最近的遗传同质化可能是由于富营养化使适应性景观变平而引起的，但是在人工孵化场从人工受精卵中获得的幼体大量放养也可能是一个促成因素。为了保护同胞共性种群之间的多样性，重要的是要重新建立有利于物种多样性的生态条件，并修改传统的管理策略。

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