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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Northern shrimp (Pandalus borealis) oxygen consumption and metabolic enzyme activities are severely constrained by hypoxia in the Estuary and Gulf of St. Lawrence
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Northern shrimp (Pandalus borealis) oxygen consumption and metabolic enzyme activities are severely constrained by hypoxia in the Estuary and Gulf of St. Lawrence

机译：在河口和圣劳伦斯湾缺氧严重限制了北部虾（Pandalusborealis）的耗氧量和代谢酶活性

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摘要

Northern shrimp is an important commercial species in the Estuary and Gulf of St Lawrence. It is usually found at depths ＞ 150 m and thus frequently inhabits hypoxic areas (18-40% saturation) in this region. To evaluate the impact of hypoxia on adult shrimp, males and females were exposed to different levels of dissolved oxygen at two temperatures (5 and 8 ℃). Standard and maximal metabolic rates as well as the critical oxygen threshold were measured. In addition, metabolic and antioxidant enzyme activities were measured at 5 ℃ Females had a higher critical oxygen threshold than males at both temperatures (15.5 and 22.2 vs. 9.0 and 13.8 at 5 and 8 ℃ respectively), indicating that they were less tolerant of hypoxia. A decrease in glycolytic and fermentation enzyme activities confirmed this result: in females, severe hypoxia significantly decreased the specific activities of citrate synthase and of enzymes involved in anaerobic biochemical pathways (lactate dehydrogenase, pyruvate kinase, and phosphoenolpyruvate carboxykinase (PEPCK)); in males, only the PEPCK activity decreased significantly while glutathione peroxidase (antioxidant defense) activity increased significantly. In females, severe hypoxia (22% sat) did not affect the standard metabolic rate but significantly reduced (by -43%) the maximum metabolic rate compared to normoxia. Consequently, aerobic scope was reduced by -58% at 22% sat compared to normoxia. This suggests that the shrimp's flexibility to respond to metabolic demands, including such activities as vertical migration, foraging, and egg production, could be reduced in hypoxic conditions, especially in females.
机译：北部虾是河口和圣劳伦斯湾的重要商业品种。通常在深度大于150 m处发现，因此经常居住在该区域的低氧区域（饱和度为18-40％）。为了评估缺氧对成年虾的影响，在两个温度（5和8℃）下，将雄性和雌性暴露于不同水平的溶解氧。测量标准和最大代谢率以及临界氧阈值。此外，在5℃下测得的代谢和抗氧化酶活性在两个温度下，女性的临界氧阈值均高于男性（分别为15.5和22.2，而在5和8℃分别为9.0和13.8），表明它们对缺氧的耐受性较弱。糖酵解和发酵酶活性的降低证实了这一结果：在女性中，严重的缺氧显着降低了柠檬酸合酶和厌氧生化途径所涉及的酶（乳酸脱氢酶，丙酮酸激酶和磷酸烯醇丙酮酸羧激酶（PEPCK））的比活性；在男性中，只有PEPCK活性显着下降，而谷胱甘肽过氧化物酶（抗氧化防御）活性显着增加。在女性中，严重缺氧（饱和度为22％）不影响标准代谢率，但与正常氧相比，最大代谢率显着降低（降低了-43％）。因此，与常氧相比，有氧运动范围在22％饱和时减少了-58％。这表明在低氧条件下，特别是在雌性条件下，虾对新陈代​​谢需求的适应能力可能会降低，包括垂直迁移，觅食和产卵等活动。

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