...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Comparative Physiology, B. Biochemical, Systemic, and Environmental Physiology >How does the cold stenothermal gadoid Lota lota survive high water temperatures during summer?
【24h】

How does the cold stenothermal gadoid Lota lota survive high water temperatures during summer?

机译：在夏天，冷的狭窄的热腾腾的Lota lota如何在高水温下生存？

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The cold-stenothermal freshwater gadid Lota lota inhabiting the potamic regions of lowland rivers in central Europe, is exposed to summer temperatures up to 25 degreesC, which is far above the thermal preferendum of this species. Oxygen consumption rates, determined in field catches sampled at different times of the year, revealed that the basal metabolic rate is depressed during summer when water temperatures are high (152+/-16 mumol O-2 100 g(-1) h(-1)at 22 degreesC in July compared to 250+/-33 mumol O-2 100 g(-1) h(-1) at 6 degreesC in November). This observation led us to investigate whether the observed depression of the metabolic rate is caused by oxygen limitation due to thermal impairment of the ventilatory system, as has been observed in other species. Determination of anaerobic end products (lactate and succinate) in the liver tissue of fish caught at different sampling dates did not show an accumulation of anaerobic end products during the summer, indicating no oxygen limitation. Measurements of enzyme activities in the white musculature and liver suggest that enzymes involved in aerobic metabolism were down-regulated during summer, which may have contributed to the observed reduction of metabolic rate.
机译：冷中温淡水gadid Lota lota栖息在欧洲中部低地河流的钾盐地区，夏季温度高达25摄氏度，远高于该物种的热偏好。在一年中不同时间采样的田间捕获物中确定的耗氧率表明，在夏季水温高时（152 +/- 16 mumol O-2 100 g（-1）h（- 1）7月为22摄氏度，而11月份6摄氏度为250 +/- 33 mumol O-2 100 g（-1）h（-1）。该观察结果使我们研究了观察到的代谢率下降是否是由于通气系统的热损伤导致的氧气限制所致，正如其他物种所观察到的那样。在不同采样日期捕获的鱼的肝组织中，厌氧终产物（乳酸和琥珀酸盐）的测定在夏季没有显示出厌氧终产物的积累，表明没有氧气限制。对白色肌肉组织和肝脏中酶活性的测量表明，有氧代谢中涉及的酶在夏季被下调，这可能导致观察到的代谢率降低。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号