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首页> 外文期刊>Canadian Journal of Zoology >Investigating fish migration, mortality, and physiology to improve conservation planning of anadromous salmonids: a case study on the endangered North Sea houting (Coregonus oxyrinchus)
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Investigating fish migration, mortality, and physiology to improve conservation planning of anadromous salmonids: a case study on the endangered North Sea houting (Coregonus oxyrinchus)

机译：调查鱼类迁移，死亡率和生理学，提高阿赤盐鲑鱼的保护规划：濒危北海举行的案例研究（Coregonus oxyrinchus）

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摘要

Understanding migratory behavior, mortality, and physiology is essential for conservation of many species, particularly anadromous fish. In this study, freshwater and marine migrations of the endangered salmonid North Sea houting (Coregonus oxyrinchus (Linnaeus, 1758)) were investigated using telemetry. Furthermore, physiological samples were collected from North Sea houting and from resident and anadromous populations of the closely related European whitefish (Coregonus lavaretus (Linnaeus, 1758)) to compare hypo-osmotic tolerances. On average, North Sea houting spent 193 days at sea where the mortality was 36%. Most fish returned from sea in the autumn, and river entry correlated inversely with river temperature and positively with discharge. Fish spent an average of 49 days in the estuarine area. Artificial lakes negatively affected migration speeds. Migration speeds did not differ consistently between individuals (i.e., not a repeatable trait) but correlated positively with water temperature. Fish arrived at spawning areas in November. In the post-spawning state, Na+/K+-ATPase activities were elevated in North Sea houting and anadromous whitefish compared with resident whitefish, while osmolality was elevated only in North Sea houting. Our study provides important information for conservation planning related to the Habitat Directive of the European Union that lists the North Sea houting as critically endangered.
机译：了解迁徙行为，死亡率和生理学对保护许多物种，特别是阿累累的鱼至关重要。在本研究中，使用遥测研究了濒临灭绝的鲑鱼北海举行的淡水和海洋迁徙（Coregonus oxyrinchus（Linnaeus，1758））。此外，从北海举行的生理样品收集，从北海举行，从密切相关的欧洲白鲑鱼（Coregonus Lavaretus（Linnaeus，1758））中收集到居民和副群体），以比较麻醉渗透性耐受性。平均而言，北海在海上花了193天，死亡率为36％。大多数鱼在秋天从海上返回，河流进入与河流温度和放电积极相关。鱼在河口地区平均花了49天。人造湖泊影响了迁移速度。个体之间的迁移速度没有始终如一的（即，不是可重复的特征），但是随着水温呈正相关。鱼在11月到达产卵区。在产卵后状态下，与居民白鲑鱼相比，北海举行的北海举行和赤散性白鱼升高了Na + / K + -AtPase活动，而莫尔奇利只在北海举行中升高。我们的研究提供了与欧洲联盟的栖息地指令有关的保护计划的重要信息，列出了北海举行的北欧濒临灭绝。

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