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首页> 外文期刊>Marine ecology progress series >Effect of salinity on spatial distribution and cell volume regulation in two sibling species of Marenzelleria (Polychaeta: Spionidae)
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Effect of salinity on spatial distribution and cell volume regulation in two sibling species of Marenzelleria (Polychaeta: Spionidae)

机译：盐度对Marenzelleria（Polychaeta：Spionidae）的两个兄弟姐妹物种的空间分布和细胞体积调节的影响

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摘要

Marenzelleria sibling species Types Ⅰ and Ⅱ are characteristically distributed within the salinity gradient of the Elbe estuary. For the first time F_1-hybrids between the 2 Marenzelleria species were found. Type Ⅰ inhabits mainly the isoosmotic/hyperosmotic range, while Type Ⅱ and the F_1-hybrids prevail in the hypoosmotic range. A sympatric occurrence could be inferred in salinity ranges from 3.3 to 12.3 ppt. Marenzelleria sibling species Type Ⅱ has been found for the first time in the North Sea (Elbe estuary). The influence of salinity on the distribution of Marenzelleria spp. was examined by laboratory experiments. In a time-course experiment with salinity changes from 10 to 25 ppt and from 25 to 10 ppt, respectively, enzyme activities and free amino acids were determined. The activities of alanine aminotransferase, aspartate aminotransferase, and glutamate dehydroge-nase were always higher in Type Ⅰ than in Type Ⅱ. A salinity increase from 10 to 25 ppt resulted in a faster increase of the concentrations of D,L-alanine, glycine, serine, glutamate and threonine in Type Ⅰ. The biochemical results showed that the capacity of cell volume regulation could be involved in the different spatial distributions of the 2 sibling species.
机译：Marenzelleria同胞物种Ⅰ和Ⅱ类型在易北河河口盐度梯度内分布。首次发现2个Marenzelleria物种之间的F_1杂种。 Ⅰ型主要分布在等渗/高渗范围内，而Ⅱ型和F_1-杂合子主要分布在低渗范围内。盐度范围为3.3至12.3 ppt时，可以推断出同胞发生。在北海（易北河河口）首次发现了马氏z同级物种Ⅱ。盐度对Marenzelleria spp分布的影响。通过实验室实验进行了检查。在时程实验中，盐度分别从10到25 ppt和从25到10 ppt改变，确定了酶活性和游离氨基酸。 Ⅰ型的丙氨酸转氨酶，天冬氨酸转氨酶和谷氨酸脱氢酶的活性始终高于Ⅱ型。盐度从10 ppt增加到25 ppt导致Ⅰ型D，L-丙氨酸，甘氨酸，丝氨酸，谷氨酸和苏氨酸的浓度增加更快。生化结果表明，细胞体积调节能力可能与2个兄弟姐妹物种的不同空间分布有关。

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