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首页> 外文期刊>Aquatic Sciences >Gammarus pulex (Crustacea: Amphipoda) avoids increasing water temperature and intraspecific competition through vertical migration into the hyporheic zone: a mesocosm experiment
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Gammarus pulex (Crustacea: Amphipoda) avoids increasing water temperature and intraspecific competition through vertical migration into the hyporheic zone: a mesocosm experiment

机译：Gammarus pulex（甲壳纲：Amphipoda）通过垂直迁移到流变区避免了水温升高和种内竞争：中观实验

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摘要

The saturated interstices below and adjacent to the riverbed (i.e., the hyporheic zone) can be a refuge for biota during low flows, flow cessation and river drying. Prior to complete drying, organisms are constrained by abiotic and biotic factors (e.g., water temperature, competition) and may respond through vertical migration into the hyporheic zone. However, it remains unclear when temperature and competition become harsh enough to trigger migration. Furthermore, potential consequences of using the hyporheic zone, which is often food-limited, on the survival, effects on ecosystem function and physiology of organisms are unknown. We tested the hypotheses that (1) Gammarus pulex, a widespread detritivore, migrates into the hyporheic zone to avoid increasing surface water temperature and intraspecific competition and (2) that these factors would reduce their survival, leaf mass consumption and energy stores. Using 36 mesocosms, three temperature (15, 20, 25 A degrees C) and species density levels (low, medium, high) were manipulated in a factorial design over 15 days. Increasing temperature to 25 A degrees C and a threefold increase in density both caused G. pulex to vertically migrate, and the interaction of these factors was additive, rather than antagonistic or synergistic. Importantly, survival, leaf consumption and glycogen content were reduced in high temperature and density treatments, suggesting tradeoffs between tolerating harsh surface conditions and limitations of inhabiting the hyporheic zone. Identifying that the hyporheic zone is used by G. pulex to avoid high water temperature and intraspecific competition is a key finding considering the global-scale increases in temperature and flow intermittence.
机译：在河床以下和附近（即流变带）的饱和空隙可能是低流量，停止流量和河流干燥期间生物群落的避难所。在完全干燥之前，生物受到非生物和生物因素（例如，水温，竞争）的约束，并可能通过垂直迁移进入流变区而做出响应。然而，尚不清楚何时温度和竞争变得足够严峻以至于引发迁移。此外，使用通常受食物限制的低变流带对生物的生存，对生态系统功能和生理的影响的潜在后果是未知的。我们检验了以下假设：（1）广泛分布的Gammarus pulex迁移到流变区以避免地表水温度升高和种内竞争，以及（2）这些因素会降低其存活率，叶片质量消耗和能量存储。使用36个中观世界，在15天中以析因设计处理了三个温度（15、20、25 A摄氏度）和物种密度水平（低，中，高）。温度升高到25 A摄氏度和密度增加三倍，都导致pulex pulex垂直迁移，这些因素的相互作用是加性的，而不是拮抗的或协同的。重要的是，在高温和高密度处理中，存活率，叶片消耗量和糖原含量降低了，这表明在耐受恶劣的表面条件和居住在低渗区的局限性之间需要进行权衡。考虑到全球范围内温度和水流间歇性的上升，鉴定G. pulex使用了低变流区来避免高水温和种内竞争。

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  • 来源
    《Aquatic Sciences》 |2017年第1期|45-55|共11页
  • 作者

    Vander Vorste R.; Mermillod-Blondin F.; Hervant F.; Mons R.; Datry T.;

  • 作者单位

    Ctr Lyon Villeurbanne, IRSTEA, UR MALY, 5 Rue Doua,CS70077, F-69626 Villeurbanne, France;

    Univ Lyon 1, CNRS, LEHNA, Ecol Hydrosyst Nat & Anthropises,UMR 5023, 6 Rue Raphael Dubois, F-69622 Villeurbanne, France;

    Univ Lyon 1, CNRS, LEHNA, Ecol Hydrosyst Nat & Anthropises,UMR 5023, 6 Rue Raphael Dubois, F-69622 Villeurbanne, France;

    Ctr Lyon Villeurbanne, IRSTEA, UR MALY, 5 Rue Doua,CS70077, F-69626 Villeurbanne, France;

    Ctr Lyon Villeurbanne, IRSTEA, UR MALY, 5 Rue Doua,CS70077, F-69626 Villeurbanne, France;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Stream drying; Refuge; Resistance; Resilience; Avoidance behavior; Invertebrates;

    机译：溪流干燥;避难所;抵抗力;弹性;回避行为;无脊椎动物;

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