Adaptation in a Peripheral Habitat: Intraspecific Variation in Osmoregulatory Traits in an Estuarine Hermit Crab (Pagurus minutus)
Adaptation in a Peripheral Habitat: Intraspecific Variation in Osmoregulatory Traits in an Estuarine Hermit Crab (Pagurus minutus)
复制标题
周边栖息地的适应：河口寄居蟹（Pagurus minutus）渗透调节特性的种内变异
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
R. Tasaka
中科院分区：
文献类型：
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作者：
K. Yoshino;T. Koga;K. Taniguchi;R. Tasaka
摘要
研究了瓦卡河河口上游、河口和中部3个站位的微小寄居蟹的调节能力。该网站有不同的盐度制度，我们测试螃蟹是否适应他们的网站本地或是否表现出表型可塑性。与其他两个站点（2008 -31）不同，上游在低潮时盐度较低（2016）。在7个不同盐度（0-52.5）下，小中华绒螯蟹均能在8.75-52.5的盐度范围内存活24 h。而来自上游的蟹在稀释的培养基中保持了较高的血淋巴渗透压，大多数蟹甚至能在0盐度的培养基中存活24 h。其他两个地点的螃蟹无法忍受这种条件，全部死亡。另一个实验，涉及1周的驯化，以5个盐度下降的媒体（35至0），表明生存约1.3倍以上的螃蟹从上游比其他两个网站。由于上游的蟹类密度明显低于其他两个地点，因此上游是由中央盐碱栖息地的不对称幼虫散布建立的边缘栖息地。然而，没有螃蟹从盐水网站生存暴露于盐度为零的介质。这些结果表明，从河口上游的蟹类的高盐度调节能力并不代表一个本地的适应，蟹类获得它通过发育可塑性扩散后。
ABSTRACT
We investigated osmoregulatory ability of Pagurus minutus from three sites on the Waka River estuary (upper reach, river mouth, and middle). The sites have different salinity regimes and we tested whether crabs were adapted to their site locally or whether they showed phenotypic plasticity. The upper reach had a low salinity (∼16) during low tide, unlike the other two sites (∼28–31). The exposure of crabs from each site to seven different salinity levels (0–52.5) showed that P. minutus is a hyper-hypo-osmoregulator at all sites and is able to survive in 8.75–52.5 salinity levels for 24 h. Crabs from the upper reach, however, maintained greater hemolymph osmolarity in diluted media, and most of them were able to survive in even 0 salinity medium for 24 h. Crabs from the other two sites were not able to tolerate this condition and all died. Another experiment, involving a 1-wk acclimation to 5 decreasing salinity media (35 to 0), showed that the survival was about 1.3 times greater for crabs from the upper reach than from the other two sites. Because the crab density of the upper reach was significantly less than that of the other two sites, the upper reach is a marginal habitat established by asymmetrical larval dispersal from central saline habitats. Nevertheless, no crab from the saline sites survived exposure to the salinity of zero medium. These results suggest that the high osmoregulatory ability of crabs from the upper reach of the estuary does not represent a local adaptation; crabs acquire it after dispersal through developmental plasticity.
影响因子：
1.6
作者：
Lee, CE;Petersen, CH
通讯作者：
Petersen, CH