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| Effects of Salinity on Na+/K+-ATPase and Digestive Enzyme Activities of Turtle Trachemys scripta elegans |
| ZHANG Ke,HONG Mei-Ling,SHI Hai-Tao,CUI Xue-Qin,JIANG Meng-Meng,LIN Duo-Li |
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Abstract Turtle Trachemys scripta elegans with initial body weight of (125 .60 ± 19 .84) g were reared in a concrete tank at a salinity of 5 ,15 ,25 ,and 35 and freshwater for 90 days .The Na+ /K+-ATPase activi-ties in intestine ,liver and muscle were found to be increased firstly and then decreased with elapse of salin-ity stress ,the maximum at a salinity of 5 .In the stomach ,however ,Na+ /K+-ATPase activity was weak-ened with increase in salinity significantly (P<0 .05) .The pepsin activities were consistent with the chan-ges of ambient salinity and all increased firstly then decreased ,the maximum at a salinity of 5 ,and the he-patic lipase activity was decreased firstly and increased secondly ,and then decreased ,the maximum at a salinity of 15 .Intestinal lipase and amylase activities were weakened with increase in salinity .It is conclu-ded that high salinity (over 15) led to inhabit Na+ /K+-ATPase activity ,thus mortality of the turtle . However ,since low salinity (below 5)promoted Na+ /K+-ATPase activity ,and hence the turtle can sur-vive in low salinity (a salinity of below 5) waters more than 3 months .It is speculated that the turtle could invade in a wide range of waters ,even brackish water .
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Received: 25 August 2014
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