GU Zhong-qi1, LI Yi-feng2, GUO Xing-pan2, CHEN Yu-ru2,ZHOU Min-dong1, HUANG Ji1, YANG Jin-long2
1.Institute of Marine Science and Technology in Zhejiang Province, Zhoushan 202450, China; 2.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
Abstract: In this study, the combined effects of temperature (from 10 ℃ to 17 ℃) and copper (Ⅱ) concentrations ranging from 0 (control) to 300.48 μg/L on survival and growth of straight-hinge veliger larvae were investigated in musselMytiluscuruscus. The results showed that the larval survival in 10 and 14 ℃ groups was found to be significantly reduced at copper concentrations of 193.94 and 300.48 μg/L in 96 h (P<0.05), while the larval survival in 17 ℃ group was shown to be significantly reduced at copper concentrations ≥ 56.58 μg/L in 96 h, with LC50of 143.6 μg/L at 10 ℃, 143.5 at 14 ℃ and 133.0 μg/L 17 ℃, indicating that the LC50values was decreased with warming temperature. The 96 h growth trial revealed that significant difference in the relative growth rates in shell length was only observed between the copper treated group (56.58 μg/L) and the control group at 10 ℃(P<0.05). At 14 ℃ and 17 ℃, however, significant difference in the relative growth rates in shell length was found between the the copper treated groups (32.63 and 56.58 μg/L) and the control in 96 h(P<0.05). Within the same copper concentration and various temperature, there was significant higher shell growth rate at 17 ℃ than at 10 ℃ and 14 ℃ in 96 h. The findings indicate that copper stress and changes in water temperature affect survival of the straight-hinge veliger larvae, and that larvae are more sensitive to copper stress in higher temperature.
2014, Vol. 29 
