碱度和pH对西藏拟溞存活、生长和生殖的影响
EFFECTS OF ALKALINITY AND PH ON THE SURVIVAL, GROWTH AND NEONATE PRODUCTION OF DAPHNIOPSIS TIBETANA SARS
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摘要: 在温度为16±0.5℃和盐度15.5±0.5的条件下,研究了碱度和pH对西藏拟溞(Daphniopsis tibetanaSars)存活、生长和生殖的影响。结果表明,西藏拟溞的24h半致死pH为4.18和10.84;48h半致死pH为4.37和10.71;24h和48h半致死碱度分别为529.43mmol/L和503.69mmol/L。西藏拟在培养液的pH7-8时,生长率和存活率显著高于其他各组。pH7时,西藏拟溞的内禀增长率最大,为0.3014/d。pH8时次之,为0.2924/d。西藏拟溞在各碱度组中的生长率和存活率差异不显著。碱度为11.9mmol/L时,西藏拟溞产幼前发育期最短,为18.70±0.65d。在碱度11.9和18.9mmol/L时,其产卵率为1.1671和1.1877,高于其他各组。西藏拟溞在碱度为7.54mmol/L组中的rm最高,为0.3425/d,其他各组的rm在0.2889-0.3276/d之间。西藏拟溞生存的最适pH为7-8,最适碱度为4.75-18.9mmol/L。Abstract: Daphniopsis tibetana Sars (Crustacea :Cladocera :Daphniidae)is a low-medium saline lake cladoceran showing wide but patchy distribution in plateau saline lake in Asia.In China, D.tibetana widely distributes in saline waters in Tibet, Qinghai province and Xinjiang province.In the present paper, D.tibetana were collected from Lake Namuka Co.The animals can live in diluted seawater via acclimatization.Effects of alkalinity and pH on the survival, growth and neonate production of D.tibetana Sars were studied under 16 ±0.5 ℃and S =15.5 ±0.5.The results showed that 24h LC50 of pH on D.tibetana were 4.18 and 10.84, and 48h LC50 of pH on it were 4.37 and 10.71 ;24h LC50 and 48h LC50 of alkalinity on D.tibetana were 529.43mmol/L and 503.69mmol/L, respectively.When D.tibetana was reared at pH 7 -8, growth and survival rate were significantly higher than those were reared at other groups.When D.tibetana was reared at pH7, intrinsic rate of increase (rm)was 0.3014/d, which was the highest of all tested groups.When at pH8, rm was 0.2924/d.Survival rates and growth rate of D.tibetana who reared at ALK =4.75 -18.9 mmol/L did not significantly differ.When alkalinity was 11.9 mmol/L, age at first production (d)was 18.70 ±0.65 d, which was lower than other groups.The rate of egg production of D.tibetana who were reared 11.9 and 18.9 mmol/L of alkalinity were 1.1671 and 1.1877, which were higher than those were reared at other groups.When D.tibetana was reared at 7.54 mmol/L of alkalinity, rm was 0.3425/d, which was the highest of all tested groups.At other tested groups, rm of D.tibetana were 0.2889 -0.3425/d.In terms of results, optimal pH and alkalinity of survival of D.tibetana were 7 -8 and 4.75 -18.9mmol/L, respectively
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Keywords:
- Daphniopsis tebitana Sars /
- Alkalinity /
- pH /
- Survival /
- Growth /
- Neonate production
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