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首页> 外文期刊>Marine ecology progress series >Reproductive isolation and morphological divergence between cryptic lineages of the copepod Acartia tonsa in Chesapeake Bay
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Reproductive isolation and morphological divergence between cryptic lineages of the copepod Acartia tonsa in Chesapeake Bay

机译：切萨皮克湾the足类A螨的隐性谱系之间的生殖隔离和形态差异

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摘要

Recent advances in molecular technologies have revealed cryptic species across many marine zooplankton taxa. However, the patterns and drivers of cryptic divergence are complex, and few studies have examined reproductive status among lineages through crosses. In this study, we performed pair crosses within and between 2 deeply divergent (cryptic) lineages (named 'fresh' [F] and 'salt' [S]) of the estuarine copepod Acartia tonsa from upper Chesapeake Bay, USA, to examine egg production and hatching rate. We also examined differences in morphology (prosome length) and chemical composition of the 2 lineages. Crossing experiments revealed that egg production did not differ among cross types but hatching rate was significantly lower for the between-lineage crosses (mean hatching rate of 0.02 for FxS vs. 0.46 and 0.52 for FxF and SxS, respectively). The nearly complete lack of nauplii production for between-lineage crosses suggests strong reproductive isolation, which supports previous molecular data. Significant differences between the lineages in size (F lineage is 13-14% shorter) and chemical com position (F lineages have 70% less carbon per copepod) may indicate pre-zygotic barriers to reproduction (e.g. morphological or gametic incompatibility). Overall, based on the crossing, mor phological, and chemical data reported here, and synthesizing previous biological data on the F and S lineages, we suggest that these cryptic lineages are likely to be separate, reproductively isolated species. Further work examining how divergent lineages of A. tonsa respond to environmental change and how they differ in their quality as prey items will be important for understanding trophic dynamics in estuarine environments like Chesapeake Bay.
机译：分子技术的最新进展揭示了许多海洋浮游生物类群中的隐性物种。但是，隐性分歧的模式和驱动因素很复杂，很少有研究通过杂交研究谱系之间的生殖状态。在这项研究中，我们对来自美国切萨皮克湾上游的河口co足类A螨Acartiatonsa的2个深度不同（隐性）谱系（分别称为“新鲜” [F]和“盐” [S]）进行了配对杂交，以检查卵生产和孵化率。我们还检查了这两个谱系的形态（基因组长度）和化学组成的差异。杂交实验表明，不同杂交类型的产卵量没有差异，但种间杂交的孵化率明显较低（FxS的平均孵化率为0.02，FxF和SxS的平均孵化率为0.46和0.52）。对于谱系间的杂交，几乎完全没有无节幼体的产生，表明强烈的生殖分离，这支持了以前的分子数据。谱系大小（F谱系短13-14％）和化学组成（F谱系每co足类的碳含量降低70％）之间的显着差异可能表明合子前繁殖障碍（例如形态或配子不相容性）。总的来说，根据此处报道的杂交，形态和化学数据，并综合先前的F和S谱系生物学数据，我们建议这些隐性谱系可能是单独的，生殖分离的物种。进一步研究A.tonsa的不同血统如何应对环境变化以及它们作为猎物的质量如何差异，对于了解切萨皮克湾等河口环境中的营养动力学至关重要。

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