Effects of extreme temperatures on survival,food consumption,growth,and gonad traits of the sea urchin Glyptocidaris crenularis
Author(s): SUN Ping, CHANG Ya-qing, ZHAO Chong, WEI Hang-jing, Key Laboratory of Mariculture & Stock Enhancement in North China ’s Sea, Ministry of Agriculture, Dalian Ocean University
Pages: 1085-1090
Year: 2015 Issue: 4
Journal: Chinese Journal of Ecology
Keyword: extreme temperature; Glyptocidaris crenularis; survival rate; food consumption; growth; gonad traits; maximum pressure endurance.;
Abstract: The effects of extreme temperatures on survival,food consumption,growth,and gonad traits of the sea uchins Glyptocidaris crenularis were studied. Two treatments and one control group were involved. The control group was set at 19-23 ℃,and 30 ℃ and-2 ℃ were set as the two extreme temperature levels. Each group had three replicates,with each replicate consisting of 60 individuals. The experiment duration was 56 days. The results showed that the mortality rate of G.crenularis reached 100% within 2 days when G. crenularis were exposed to 30 ℃. The average food consumption( 5.19 ± 1. 31 g·ind-1) of G. crenularis at 30 ℃ was significantly lower than that in the control group( 15.15±1.58 g·ind-1)( P<0.01). No significant difference was found for the survival rate of G. crenularis between the low temperature and the control groups( P>0.05),although the food consumption( 0.18±0.04 g·ind-1) of G. crenularis at-2 ℃ was significantly lower than that in the control group( 10.90±0.33 g·ind-1)( P<0.01). The average body weight of G. crenularis in the low temperature group was significantly lower than that in the control group after 56 days. Wet lantern weight,lantern index,wet shell weight,wet gonad weight,dry shell weigh and shell index of individuals in the low temperature group were all significantly lower than those in the control group( P < 0. 01). Dry gonad weight and dry lantern weight were significantly lower than those in the control group( P < 0.05). However,no significant difference was found in gonad index( P>0.05). Maximum pressure endurance of G. crenularis shell was significantly different between the low temperature and the control groups( P<0.01). These findings indicate that G. crenularis can not survive at extreme high temperature( 30 ℃); at the extreme low temperature(-2 ℃),most of G. crenularis can survive during the experiment,while food consumption,growth and gonad weight are significantly reduced.
Pages: 1085-1090
Year: 2015 Issue: 4
Journal: Chinese Journal of Ecology
Keyword: extreme temperature; Glyptocidaris crenularis; survival rate; food consumption; growth; gonad traits; maximum pressure endurance.;
Abstract: The effects of extreme temperatures on survival,food consumption,growth,and gonad traits of the sea uchins Glyptocidaris crenularis were studied. Two treatments and one control group were involved. The control group was set at 19-23 ℃,and 30 ℃ and-2 ℃ were set as the two extreme temperature levels. Each group had three replicates,with each replicate consisting of 60 individuals. The experiment duration was 56 days. The results showed that the mortality rate of G.crenularis reached 100% within 2 days when G. crenularis were exposed to 30 ℃. The average food consumption( 5.19 ± 1. 31 g·ind-1) of G. crenularis at 30 ℃ was significantly lower than that in the control group( 15.15±1.58 g·ind-1)( P<0.01). No significant difference was found for the survival rate of G. crenularis between the low temperature and the control groups( P>0.05),although the food consumption( 0.18±0.04 g·ind-1) of G. crenularis at-2 ℃ was significantly lower than that in the control group( 10.90±0.33 g·ind-1)( P<0.01). The average body weight of G. crenularis in the low temperature group was significantly lower than that in the control group after 56 days. Wet lantern weight,lantern index,wet shell weight,wet gonad weight,dry shell weigh and shell index of individuals in the low temperature group were all significantly lower than those in the control group( P < 0. 01). Dry gonad weight and dry lantern weight were significantly lower than those in the control group( P < 0.05). However,no significant difference was found in gonad index( P>0.05). Maximum pressure endurance of G. crenularis shell was significantly different between the low temperature and the control groups( P<0.01). These findings indicate that G. crenularis can not survive at extreme high temperature( 30 ℃); at the extreme low temperature(-2 ℃),most of G. crenularis can survive during the experiment,while food consumption,growth and gonad weight are significantly reduced.
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