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Sex‐specific effects of hybridization on reproductive fitness in Mytilus
Journal of Zoological Systematics and Evolutionary Research ( IF 1.9 ) Pub Date : 2019-11-22 , DOI: 10.1111/jzs.12348
Ellen L. Kenchington 1 , Barry W. MacDonald 1 , Andrew Cogswell 1 , Lorraine C. Hamilton 1 , Angel P. Diz 2
Affiliation  

Blue mussels of the genus Mytilus form extensive hybrid zones in the North Atlantic and elsewhere where the distributions of different species overlap. Mytilus species transmit both maternal and paternal mtDNA through egg and sperm, respectively, a process known as doubly uniparental inheritance (DUI), and some females produce offspring with extremely biased sex ratios. These two traits have been shown to be linked and maternally controlled, with sex determination involving nuclear–cytoplasmic interactions. Hybridization has been shown to disrupt DUI mitochondrial inheritance and sex ratio bias; however, the effect of hybridization on reproductive fitness has not previously been examined. We investigated this effect in M. edulis × M. trossulus crosses through histological examination of mature F1 progeny, and spawning of F1 hybrids to monitor survival of their progeny through to the D stage of larval development. For progeny produced from mothers with a strong bias toward female offspring (often 100%) in pure‐bred crosses, there was a clear breakdown in female dominance of progeny and significantly more hermaphrodites in the hybrid crosses produced from sperm with the M‐tr1 mitotype. We also found significant sex‐specific differences among hybrid progeny, with females producing normal eggs while males and hermaphrodites evidenced impaired gonadal development with significantly greater numbers of Sertoli cells, phagocytic hemocytes, and degenerating germ cells, all associated with gonad resorption. Males from crosses where DUI was disrupted and where male progeny were homoplasmic for the female mtDNA were the most severely compromised. Allelic incongruity between maternal and paternal mitotypes in hybrid crosses was associated with significant disruption of male gonadal development.

中文翻译:

杂交对Mytilus生殖适应性的性别特异性影响

Mytilus属的蓝贻贝在北大西洋和其他物种分布重叠的其他地方形成广泛的杂种区。Mytilus物种分别通过卵和精子传播母体mtDNA和父体mtDNA,这一过程被称为双单亲遗传(DUI),有些雌性产生的后代的性别比极度偏向。这两个特征已被证明是相互联系并由母亲控制的,涉及到核质相互作用的性别决定。杂交已显示破坏DUI线粒体遗传和性别比偏差。然而,杂交对生殖适应性的影响以前没有被研究过。我们调查了可食的M. edulis × trossulus通过成熟F1后代的组织学检查和F1杂种的产卵来监控其后代直至幼虫发育的D阶段的存活。对于由纯种杂交后代对雌性后代有强烈偏见(通常为100%)的母亲产生的后代,在具有M‐tr1基因型精子的杂交后代中,雌性后代的优势明显下降,雌雄同体的数量明显增加。我们还发现杂种后代之间存在明显的性别差异,雌性产生正常卵,而雄性和雌雄同体证明性腺发育受损,其中支持细胞,吞噬血细胞和退化生殖细胞数量明显增加,所有这些都与性腺吸收有关。DUI受到破坏且雄性子代与雌性mtDNA同质的杂交中的雄性受害最严重。杂种杂交中母本和父本基因型之间的等位基因不一致与雄性腺发育显着破坏有关。
更新日期:2019-11-22
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