Ecophysiological responses to temperature of the "killer shrimp" Dikerogammarus villosus: Is the invader really stronger than the native Gammarus pulex?
Ecophysiological responses to temperature of the "killer shrimp" Dikerogammarus villosus: Is the invader really stronger than the native Gammarus pulex?
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DOI：
10.1016/j.cbpa.2011.03.019
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发表时间：
2011-07-01
影响因子：
2.3
通讯作者：
Hervant, F.
中科院分区：
文献类型：
--
作者：
Maazouzi, C.;Piscart, C.;Hervant, F.
随着全球气候变化，生物入侵被认为是淡水生物多样性下降的主要原因之一。在这种情况下，预测的全球气温上升可能会改变本地和入侵物种的地理分布。我们研究的目的是检查两种广泛分布的物种（最成功的欧洲入侵者 Dikerogammarus villosus 及其主要受害者 Gammarus pulex）对短期温度适应的代谢、行为和生理反应，以估计全球变暖对其入侵淡水生态系统的潜在影响。我们的结果表明，D. villosus 比 G. pulex 更容易受到高温的影响。本地物种似乎最适合中等温度（10-20 摄氏度），并且有可能调整到“极端”温度（5-27 摄氏度），而“杀人虾”D. villosus 似乎最适合较低温度（5-10 摄氏度），调整到 20 摄氏度以上的可能性有限。根据我们的结果，全球变暖可能不太有利于它们。 入侵物种。然而，D. villosus 的代谢率和活动率降低，与糖原含量较高相关。这种适应性策略被解释为具有功能优势，使 D. villosus 能够成功侵入恶劣和/或不可预测的生境。此外，我们的结果表明，糖原储存可用作水生变温动物最佳热窗口的有力指标。 (C) 2011 Elsevier Inc. 保留所有权利。
With global climate changes, biological invasions are considered to be one of the main causes of the decline of freshwater biodiversity. In this context, predicted increases in global temperature may alter the geographical distributions of native and invasive species. The purpose of our study was to examine the metabolic, behavioral and physiological responses to short-term temperature acclimation of two widely distributed species (the most successful European invader, Dikerogammarus villosus, and its main victim, Gammarus pulex), in order to estimate the potential effect of global warming on its invasion of freshwater ecosystems. Our results show that D. villosus is more vulnerable to high temperatures than G. pulex. The native species seems to be best adapted to intermediate temperatures (10-20 degrees C) with a possibility of adjustment to "extreme" temperatures (5-27 degrees C), whereas the "killer shrimp" D. villosus seems best adapted to lower temperatures (5-10 degrees C) with a limited possibility of adjustment above 20 degrees C In the light of our results, global warming is likely to be less favorable to the invasive species. However, D. villosus showed reduced metabolic and activity rates, associated with higher glycogen content. This adaptive strategy was interpreted as having functional advantages, allowing D. villosus to successfully invade harsh and/or unpredictable biotopes. In addition, our results show that glycogen stores may be used as a powerful indicator of the optimal thermal window for aquatic ectotherms. (C) 2011 Elsevier Inc. All rights reserved.