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首页> 外文期刊>Marine ecology progress series >Climate change influences on abundance, individual size and body abnormalities in a sandy beach clam
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Climate change influences on abundance, individual size and body abnormalities in a sandy beach clam

机译：气候变化对沙滩蛤的丰度，个体大小和身体异常的影响

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Sandy beaches are being threatened by a changing climate. However, the effects of this changing environment, including warming, on these ecosystems, have hitherto been tentative and qualitative. Using concurrent long-term (1984-2007) observations on abundance and individual size, together with laboratory examinations of body abnormalities (morphological anomalies and epibionts), we provide evidence that the sandy beach yellow clam Mesodesma mactroides of the Uruguayan coast has responded to climate change. Regional sea surface temperature anomalies (SSTA) showed an increasing trend through time, with positive values after 1997. The position of the warm water front (20 degrees C isotherm), a proxy of tropical waters, showed a long-term poleward shift rate of ca. 9 km yr(-1). Clam abundance (total and discriminated by population component) decreased through time and was inversely related to variations in SSTA, with higher abundance during cold periods. Length frequency distributions (LFDs) showed polymodal size structures with fully represented clam population components in cool years. By contrast, LFDs showed fewer size classes and larger clams were virtually absent during warm years. Prevalence of body abnormalities in M. mactroides increased through time and was positively correlated with increasing SSTA, suggesting a link with climate stress. The population dynamics of M. mactroides seems to be driven by climatic forcing, mostly related with warming. Our results demonstrate the implications of climate change in the structure of sandy beach fauna, which could be particularly relevant in ectotherms with cold water affinities. Thus, climate change should be given a high priority in sandy beach conservation planning and management.
机译：沙滩正受到气候变化的威胁。但是，迄今为止，包括气候变暖在内的环境变化对这些生态系统的影响是暂时的和定性的。使用同时进行的长期（1984-2007年）丰度和个体大小观察，以及对身体异常（形态异常和表皮异常）的实验室检查，我们提供了证据，证明乌拉圭海岸的黄色沙滩蛤Me中皮mac已经对气候做出了响应更改。区域海表温度距平（SSTA）随时间呈上升趋势，1997年后为正值。作为热带水域的代表的暖水锋（等温线为20摄氏度）的位置显示长期的极移速度为ca. 9公里（-1）。随着时间的推移，蛤的丰度（总和由种群组成区分）下降，并且与SSTA的变化呈负相关，在寒冷时期，蛤的丰度更高。长度频率分布（LFD）显示了多峰大小的结构，在凉爽的年份中蛤类种群的组成得到了充分的体现。相比之下，在温暖的年份，LFD显示出较小的尺寸等级，几乎没有大的蛤。随着时间的推移，Mactroides体异常的患病率增加，并且与SSTA的增加呈正相关，表明与气候压力有关。大型松果蝇的种群动态似乎是由气候强迫驱动的，主要与变暖有关。我们的结果证明了气候变化对沙滩动物结构的影响，这在具有冷水亲和性的外热中可能特别重要。因此，在沙滩养护规划和管理中应高度重视气候变化。

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