Rapid evolution of body fluid regulation following independent invasions into freshwater habitats: Evolution of body fluid regulation
Rapid evolution of body fluid regulation following independent invasions into freshwater habitats: Evolution of body fluid regulation
复制标题
独立入侵淡水栖息地后体液调节的快速进化：体液调节的进化
DOI：
10.1111/j.1420-9101.2012.02459.x
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发表时间：
2012
影响因子：
2.1
通讯作者：
CHARMANTIER, GUY
中科院分区：
文献类型：
--
作者：
LEE, CAROL EUNMI;POSAVI, MARIJAN;CHARMANTIER, GUY
从海洋环境到淡水环境的殖民构成了生命历史上最戏剧性的进化转变之一。定殖稀释环境提出了巨大的挑战，以获得必要的离子对陡峭的浓度梯度。本研究探讨了桡足类广膜虫入侵淡水环境后体液调节的演变。本研究的目的是确定（1）从盐水到淡水栖息地的入侵是否伴随着体液调节（血淋巴渗透压）的进化变化，以及（2）在独立入侵期间是否发生平行变化。我们测量了在一系列普通花园盐度（0.2-25 PSU）下饲养的祖先盐水和淡水入侵种群的血淋巴渗透压。 我们的研究结果揭示了在较低盐度下，E.与它们的盐水祖先有亲缘关系。此外，我们在两次独立的淡水入侵中观察到了相同的进化变化。血淋巴渗透压摩尔浓度的这种增加是一致的证据，在低盐度的淡水人口中的离子吸收增加，在以前的研究中发现，并有可能需要增加能量成本入侵淡水栖息地。我们的研究结果是一致的增加生理调节伴随着过渡到压力环境的演变。
Colonizations from marine to freshwater environments constitute among the most dramatic evolutionary transitions in the history of life. Colonizing dilute environments poses great challenges for acquiring essential ions against steep concentration gradients. This study explored the evolution of body fluid regulation following freshwater invasions by the copepodEurytemora affinis. The goals of this study were to determine (1) whether invasions from saline to freshwater habitats were accompanied by evolutionary shifts in body fluid regulation (hemolymph osmolality) and (2) whether parallel shifts occurred during independent invasions. We measured hemolymph osmolality for ancestral saline and freshwater invading populations reared across a range of common‐garden salinities (0.2–25 PSU). Our results revealed the evolution of increased hemolymph osmolality (by 16–31%) at lower salinities in freshwater populations ofE. affinisrelative to their saline ancestors. Moreover, we observed the same evolutionary shifts across two independent freshwater invasions. Such increases in hemolymph osmolality are consistent with evidence of increased ion uptake in freshwater populations at low salinity, found in a previous study, and are likely to entail increased energetic costs upon invading freshwater habitats. Our findings are consistent with the evolution of increased physiological regulation accompanying transitions into stressful environments.