Osmotic regulation in the Sheepshead Minnow Cyprinodon variegatus Lacépède
Osmotic regulation in the Sheepshead Minnow Cyprinodon variegatus Lacépède
复制标题
羊头鲦鱼 Cyprinodon variegatus Lacépède 的渗透调节
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
F. Nordlie
中科院分区：
文献类型：
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作者：
F. Nordlie
在淡水盐度至120%的条件下，对不同盐度的鲤鳝进行了血浆渗透调节。这些鱼在0.3%到70%的范围内表现出大致稳定的调节。适应淡水的鱼的血浆浓度高于0.3%的鱼，这被认为是淡水中钙离子水平较高的结果。当血盐浓度高于70%时，血药浓度突然升高。我们将C. variegatus的渗透调节特性与其他高泛盐物种的数据进行了比较，期望得到一系列的梯度反应，表现出最大淡水耐受性的物种表现出最广泛的调节范围和最低的血浆浓度。结果与预期不一致。环境盐度的范围显示出良好的血浆浓度调节被发现与所比较的所有物种的耐盐范围的大小直接相关。在高渗调节区，具有较强淡水亲和性的形式通常（但不均匀）表现出最低的血浆浓度。
Plasma osmotic regulation was evaluated in Cyprinodon variegatus acclimated to salinities from fresh water to 120%. These fish showed roughly stable regulation in the range from 0.3% to 70%. Fish acclimated to fresh water showed an increased plasma concentration over those in 0.3%, thought to result from a higher Ca++ level in fresh water. Plasma concentrations rose abruptly at salinities above 70%. Osmotic regulatory characteristics of C. variegatus were compared with data for other extremely euryhaline species with expectation of a graded series of responses, species showing greatest fresh water tolerance demonstrating widest ranges of regulation and with lowest plasma concentrations. Results were not consistent with expectations. The range of ambient salinities over which good regulation of plasma concentration was shown was found to be directly correlated with the magnitude of the salinity tolerance range of all of the species compared. Forms with greater fresh water affinity generally, but not uniformly, showed the lowest plasma concentrations in the region of hyperosmotic regulation.