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首页> 外文期刊>Marine ecology progress series >Physiological tolerance of marine calanoid copepod eggs to sulphide
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Physiological tolerance of marine calanoid copepod eggs to sulphide

机译：海洋cal类co足类卵对硫化物的生理耐受性

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ABSTRACT: The impact of anoxia and anoxia-sulphide (8 different numeric sulphide concentrations, ranging from 10 µmol l–1 to 10 mmol l–1) on hatching of subitaneous eggs of the planktonic copepod Acartia tonsa Dana was evaluated. The experiments were consequently conducted at pH 8.1. Subitaneous eggs, spawned by laboratory-reared specimens, were exposed to anoxia and anoxia-sulphide for different periods (3, 7, 14, 30, 60, 120, 180 and 240 d) and then transferred to normoxic conditions. Short-term (3 to 60 d) exposure to anoxia or anoxia-sulphide did not significantly affect the hatching success of the eggs, but hatching generally declined with increasing length of exposure. After 60 d of exposure there were significant differences between the effects caused by anoxia and anoxia-sulphide (sulphide concentrations ≥250 µmol l–1). After 240 d of exposure there were significant differences in hatching between eggs treated with anoxia and those with anoxia-sulphide (all sulphide concentrations). A short-term experiment, where subitaneous eggs were simultaneously exposed to oxygen and different sulphide concentrations, indicated that sulphide is capable of crossing the eggshell. The metabolic rate of eggs exposed to normoxic conditions was 1.86 ± 0.57 µJ h–1. Eggs exposed to anoxia had a metabolic rate of 0.08 ± 0.02 µJ h–1, whereas eggs exposed to anoxia and 14.7 mmol l–1 sulphide had a metabolic rate of 0.25 ± 0.001 µJ h–1. Based on the metabolism experiments and the fact that internal egg pH was ~6, an unknown sulphide defence mechanism is suggested to be present in A. tonsa eggs.
机译：摘要：缺氧和缺氧硫化物（8种不同的硫化物数字浓度，范围从10 µmol l –1 到10 mmol l –1 ）对亚种卵孵化的影响评估了浮游co足类动物的食足动物A螨。因此，实验在pH 8.1下进行。由实验室饲养的标本产卵的亚亚种卵在不同时期（3、7、14、30、60、120、180和240 d）暴露于缺氧和缺氧硫化物，然后转移到常氧条件下。短期（3至60 d）暴露于缺氧或缺氧硫化物不会显着影响卵的孵化成功率，但是随着暴露时间的延长，孵化率通常会下降。暴露60 d后，由缺氧和缺氧硫化物引起的影响之间存在显着差异（硫化物浓度≥250µmol l –1 ）。暴露240天后，用缺氧处理的卵和用缺氧硫化物处理的卵（所有硫化物浓度）之间的孵化率存在显着差异。一项短期实验中，亚蛋同时暴露于氧气和不同浓度的硫化物中，表明硫化物能够穿过蛋壳。暴露于常氧条件下的鸡蛋的代谢率为1.86±0.57 µJ h –1 。暴露于缺氧的鸡蛋的代谢率为0.08±0.02 µJ h –1 ，而暴露于缺氧和14.7 mmol l –1 硫化物的鸡蛋的代谢率为0.25± 0.001 µJ h –1 。基于新陈代谢实验和鸡蛋内部pH值约为6的事实，暗示A中存在未知的硫化物防御机制。汤萨鸡蛋。

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