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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Acute and chronic response to a change in salinity of the euryhaline polychaete Pygospio elegans (Claparede)
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Acute and chronic response to a change in salinity of the euryhaline polychaete Pygospio elegans (Claparede)

机译：急性和慢性反应euryhaline Polychaete Pygospio elegans（Claparede）的盐度变化

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摘要

Estuaries are thought to be very harsh environments because their physico-chemical parameters, such as salinity, temperature and oxygen, can fluctuate substantially. The distribution of species living in an estuary is largely determined by how well they can cope with such fluctuations. The spionid polychaete Pygospio elegans is common in boreal estuarine habitats that show strong salinity fluctuations, living in habitats ranging from fully marine salinities to brackish environments with salinities as low as 5. In this study we investigated the abilities of P. elegans to cope with an acute as well as a long-term change in salinity. Specimens originating from a salinity of about 15 were exposed to salinity 15 as control and 5 and 30 as low and high salinity treatments. In acute exposure experiments, we measured body volume and tissue water content as well as gene expression of seven genes related to volume- and osmoregulation within 4 h of exposure. In a long-term experiment, we monitored survival, growth and reproduction as well as potential changes in DNA methylation within 6 weeks after a gradual salinity change. In response to abrupt exposure to a hyposmotic medium (salinity 5) we observed increased body volume that could not be fully restored, increased mortality, and no clear change in gene expression. Hence, P. elegans might be a weak cell-volume regulator that cannot cope well with sudden drops in salinity. In contrast, a gradual, long-term change in salinity seemed to be less stressful, although worms at salinity 5 showed slightly increased mortality and reduced or delayed maturity. Overall, there were fewer detrimental effects of exposure to a higher salinity. While the tested salinities fall within the tolerance range of P. elegans from this population, decrease in salinity seems to be a stronger stress.
机译：河口被认为是非常恶劣的环境，因为它们的物理化学参数，如盐度，温度和氧气，可以基本上波动。生活在河口中的物种的分布基本上决定了他们可以应对这种波动的程度。 Spionid Polychaete Pygospio elegans在北方河口栖息地中常见，表现出强大的盐度波动，居住在栖息地，从全面海洋盐水到咸水的咸味，盐度低至5.在这项研究中，我们调查了P.秀丽隐杆线的能力来应对急性以及盐度的长期变化。源自约15的盐度的标本暴露于盐度15，作为对照和5和30作为低盐度处理。在急性暴露实验中，我们测量体积和组织水含量以及七个基因的基因表达，其与曝光4小时内的体积和Osmoreculation有关。在长期的实验中，我们在逐渐变化后6周内监测生存率，生长和繁殖以及DNA甲基化的潜在变化。响应于突然暴露于脓肿介质（盐度5），我们观察到增加的体积增加，不能完全恢复，增加死亡率，并且基因表达没有明确的变化。因此，P. Elgans可能是一种弱细胞体积调节剂，不能在盐度突然下降。相比之下，盐度的逐渐变化似乎不那么压力，尽管盐度5的蠕虫显示出略微增加的死亡率和降低或延迟成熟度。总的来说，暴露于更高的盐度较少的有害影响。虽然测试的盐度落入来自这群人群的P. Elegans的公差范围内，但盐度的降低似乎是更强的压力。

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