Population differences in susceptibility to stress in Littorina saxatilis from metal contaminated and uncontaminated sites in the Isle of Man

作     者：DAKA Erema Ransome 

作者机构：The University of Liverpool Port Erin Marine Laboratory Isle of Man IM9 6 JA United Kingdom Department of Applied and Environmental Biology Rivers S tate University of Science and Technology PMB 5080 Port Harcourt Nigeria. 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2006年第18卷第2期

页      面：364-368页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：TheCom m onwealthU niversitiesCom m issionintheU nitedK ingdom 

主　　题：tolerance salinity desiccation winkles Isle of Man 

摘      要：The population of the intertidal gastropod Littorina saxcailis from Laxey estuary in the Isle of Man is exposed to mine-related contamination of Zn （and is tolerant to Zn and Pb） compared to those of Castletown, Derbyhaven, Peel and Ramsey. Tolerances to salinity and desiccation stress were assayed to test how metal tolerance could affect tolerance to general stress. The winkles were experimentally exposed to salinities of 0, 17 and 60 practical salinity units （psu） with 34 psu as control. Desiccation stress was determined by aerial exposure of the winkles at 24℃. No control mortalities were recorded and mortalities in 17 psu were less than 50% for all populations over a 24-day exposure period. LT50 values （mean±SD, n=5） at 0 psu ranged from 6.6 ± 0.6 to 7.5 ± 1.3 d for winkles from Ramsey and Laxey respectively. The values for 60 psu ranged from 7.0±0.7 to 8.4±0.9 d. No significant differences in LT50 values were obtained for the salinity exposurcs（ANOVA,P〉0.05） but there was a significant difference in tolerance to desiccation （P〈0.01）. The winkles from Laxey showed very high susceptibility to desiccation stress probably indicating a physiological trade-off to metal tolerance.