塔里木河流域叶尔羌高原鳅热耐受性的初步研究

为了研究不同温度对叶尔羌高原鳅热耐受性特征的影响,在水温分别为10、20、30℃的条件下,对叶尔羌高原鳅进行2～4周的驯化,以1℃/h的变温速率连续观测试验鱼的耐受温度.结果表明:各驯化温度下的最高临界温度(CTmax)、最高致死温度(LTmax)分别为35.0、36.0、36.5℃和37.4、38.0、38.5℃,最低临界温度(CTmin)和最低致死温度(LTmin)分别为;6.7、7.0,7.5℃和0.3、0.5、1.0℃.随着驯化温度的提高,致死温度的上限和下限也提高,即耐高温的能力增强,耐低温的能力减弱.经计算,叶尔羌高原鳅在各驯化温度下的温度耐受幅分别为28.3、29.0、29.0℃;在10℃～20℃的驯化温度范围内高、低温驯化反应率分别为0.10和0.05,而在20℃～30℃驯化温度范围内高、低温驯化反应率分别为0.03和0.05;热耐受区域面积为576.5℃;表明叶尔羌高原鳅的热耐受性明显有赖于驯化温度.

A preliminary study on thermal tolerance to Triplophysa (hedinichthys) yarkandensis(Day) in Tarim River

To understand the effects of different acclimation temperature on the thermal tolerance of juvenile Triplophysa(hedinichthys) yarkandensis(Day),the juveniles were acclimated at water temperature 10 ℃,20 ℃ and 30 ℃ for 2～4 weeks,and their thermal tolerance under a temperature variation rate of 1 ℃/h was evaluated.The results showed that the critical thermal maximum(CTmax),lethal thermal maximum(LTmax),critical thermal minimum(CTmin),and lethal thermal minimum(LTmin) at acclimation temperatures 10 ℃,20 ℃ and 30 ℃ were 35.0 ℃,36.0 ℃ and 36.5 ℃;37.4 ℃,38.0 ℃ and 38.5 ℃;6.7 ℃,7.0 ℃ and 7.5 ℃;0.3 ℃,0.5 ℃ and 1.0 ℃.The test parameters all increased with the increasing of acclimation temperature.The thermal tolerance amplitude at 10 ℃,20 ℃ and 30 ℃ was 28.3 ℃,29.0 ℃ and 29.0 ℃,respectively.Within the range of acclimation temperature 10～20 ℃,the acclimation response ratio(ARR) at high and low temperatures was 0.10 and 0.05;while within the range of acclimation temperature 20～30 ℃,ARR was 0.03 and 0.05.The thermal tolerance polygon area of the juveniles with in the range of acclimation temperature 10～30 ℃ was calculated as 576.5 ℃.It was indicated that the thermal tolerance of Triplophysa(hedinichthys) yarkandensis(Day)was dependent on acclimation temperature.