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首页> 外文期刊>Marine ecology progress series >Does cortisol manipulation influence outmigration behaviour, survival and growth of sea trout? A field test of carryover effects in wild fish
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Does cortisol manipulation influence outmigration behaviour, survival and growth of sea trout? A field test of carryover effects in wild fish

机译：皮质醇操作会影响海鳟的迁徙行为，生存和生长吗？野鱼中残留效应的现场测试

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摘要

For anadromous brown trout Salmo trutta, the transition from life in freshwater to the marine environment is an inherently challenging and dangerous period characterized by high levels of mortality. As such, smoltification is a relevant life-history phase to examine how physiological state, in particular glucocorticoids, influences fitness-oriented endpoints such as migration timing and survival. We experimentally assessed the effect of cortisol by combining passive integrated transponder (PIT) telemetry with a physiologically relevant exogenous cortisol manipulation (i.e. intracoelomic injection) in juvenile sea trout in the Gudso Stream, Denmark. Individual survival, migration behaviour (timing and speed), and growth were assessed for 4 treatment categories: control (CO), sham (SH), and low- (LW; 25 mg kg~(-1)) and high-dose (HI; 100 mg kg~(-1)) cortisol. There was no difference in the timing of migration among treatments, but trout in the HI treatment had lower survival rates to the lower station (41.6％) when compared to the CO (53.9％) and SH (52.3％) groups. After migration, the system was electroshocked again to contrast growth of trout that remained in the system. HI, LW and SH individuals recaptured in the stream had lower growth rates for length than the CO treatments; HI and LW also had significantly lower growth rates for mass than CO trout. Future monitoring of this population may demonstrate the long-term repercussions of chronic stress as trout return from the ocean. This study provides contributions to our understanding of the relationship between organismal condition and fitness while elucidating the potential for carryover effects, i.e. lasting effects that influence future success.
机译：对于过时的鳟鱼来说，从淡水生活到海洋环境的过渡是一个固有的挑战性和危险时期，其特点是死亡率高。因此，糖化是一个相关的生命历史阶段，以检查生理状态（尤其是糖皮质激素）如何影响适合性的终点，例如迁移时机和生存。我们通过结合被动集成应答器（PIT）遥测技术和生理学相关的外源性皮质醇操纵（即腔内注射）在丹麦Gudso Stream的少年鳟鱼中实验性地评估了皮质醇的作用。评估了4种治疗类别的个体生存，迁移行为（时间和速度）以及生长情况：对照（CO），假（SH），低剂量（LW; 25 mg kg〜（-1））和高剂量（ HI； 100 mg kg〜（-1））皮质醇。各处理之间的迁移时间没有差异，但与CO（53.9％）和SH（52.3％）组相比，HI处理的鳟鱼到低位的成活率较低（41.6％）。迁移后，再次电击该系统，以对比保留在系统中的鳟鱼生长。捕获在溪流中的HI，LW和SH个体的长短生长率低于CO处理； HI和LW的质量增长率也远低于CO鳟鱼。鳟鱼从海洋返回时，对这一种群的进一步监测可能显示长期压力的长期影响。这项研究为我们理解机体状况与适应性之间的关系做出了贡献，同时阐明了潜在的遗留效应，即影响未来成功的持久效应。

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  • 来源
    《Marine ecology progress series》 |2014年第27期|135-144|共10页
  • 作者

    Jonathan D. Midwood; Martin Hage Larsen; Mikkel Boel; Niels Jepsen; Kim Aarestrup; Steven J. Cooke;

  • 作者单位

    Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada;

    National Institute of Aquatic Resources, Freshwater Fisheries, Technical University of Denmark, Vejlsovej 39, 8600 Silkeborg, Denmark;

    National Institute of Aquatic Resources, Freshwater Fisheries, Technical University of Denmark, Vejlsovej 39, 8600 Silkeborg, Denmark;

    National Institute of Aquatic Resources, Freshwater Fisheries, Technical University of Denmark, Vejlsovej 39, 8600 Silkeborg, Denmark;

    National Institute of Aquatic Resources, Freshwater Fisheries, Technical University of Denmark, Vejlsovej 39, 8600 Silkeborg, Denmark;

    Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental Science, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada;

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  • 正文语种 eng
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  • 关键词

    Allostasis; Carryover effects; Migration; Stress;

    机译：同种异体;残留效应;移民;强调;

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