OSMOTIC AND IONIC REGULATION AND NA(+)/K+-ATPASE, CARBONIC ANHYDRASE ACTIVITIES IN MATURE CHINESE MITTEN CRAB, ERIOCHEIR SINENSIS H. MILNE EDWARDS, 1853 (DECAPODA, BRACHYURA) EXPOSED TO DIFFERENT SALINITIES

文献类型： 外文期刊

第一作者： Wang, Ruifang

作者： Wang, Ruifang;Zhuang, Ping;Wang, Ruifang;Zhuang, Ping;Feng, Guangpeng;Zhang, Longzhen;Huang, Xiaorong;Jia, Xiaoyan

作者机构：

期刊名称：CRUSTACEANA （ 影响因子：0.529； 五年影响因子：0.65 ）

ISSN： 0011-216X

年卷期： 2012 年 85 卷 12-13 期

页码：

收录情况： SCI

摘要： Mature Chinese mitten crabs, Eriocheir sinensis H. Milne Edwards, 1853, are exposed to brackish water or seawater as an obligatory part of their reproductive migration. We investigated the changes in haemolymph osmolality, haemolymph Na+, Cl-, Ca2+ and K+ concentrations, as well as gill Na+/K+-ATPase and carbonic anhydrase activity in both mature females and males, when in freshwater (0.3 parts per thousand salinity, 8 mOsm (kg H2O)(-1)) and after step-wise acclimation to salinities ranging from 7 to 35 parts per thousand (175-1044 mOsm (kg H2O)(-1)). Both females and males strongly hyper-regulated their haemolymph osmolality over a salinity range of 0.3-21 parts per thousand, the isosmotic point approaching 28 parts per thousand salinity, and slightly hypo-regulated at 35 parts per thousand salinity. Haemolymph Na+ and Cl- levels correlated positively with haemolymph osmolality. Ca2+ and K+ levels, however, were maintained at a relatively narrow range and showed a contrary trend in their response to salinity. This indicated that Na+ and Cl- are the main contributors to increasing haemolymph osmolality. Reduced Na+/K+-ATPase and carbonic anhydrase activity in the posterior gills at elevated salinity suggests a direct physiological response to a decrease of Na+ intake. No sexual differences existed for all parameters except for significantly higher haemolymph Ca2+ and K+ levels and CA activity in females than in males at some salinity levels. It is suggested that mature Eriocheir sinensis is a strong hyper-osmoregulator but a weak hypo-osmoregulator. No sexual differences appeared to exist in osmotic and ionic regulation of mature Eriocheir sinensis exposed to different salinities.

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