High thermal stress responses of Echinolittorina snails at their range edge predict population vulnerability to future warming
High thermal stress responses of Echinolittorina snails at their range edge predict population vulnerability to future warming
复制标题
Echinolittorina 蜗牛在其范围边缘的高热应激反应预测了种群对未来变暖的脆弱性
DOI：
10.1016/j.scitotenv.2018.08.005
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发表时间：
2019
影响因子：
9.8
通讯作者：
Dong Yun-wei
中科院分区：
文献类型：
--
作者：
Han Guo-dong;Cartwright Stephen R;Ganmanee Monthon;Chan Benny K K;Adzis Kee A A;Hutchinson Neil;Wang Jie;Hui Tommy Y;Williams Gray A;Dong Yun-wei
处于其物种分布范围边缘的种群通常生活在其所能忍受的环境条件的生理极端。由于一个物种对全球变化的反应很可能在很大程度上取决于其生理表现，因此环境条件的后续变化会深刻影响分布区边缘的种群，导致分布区的扩大或缩小。为了了解分布区边缘和中心种群间的生理差异，我们测定了两种高滨螺Echinolittorina malaccana和E.辐射藻分布于沿着西北太平洋沿岸1°N至36°N之间。这些Echinolittorinasnails是非常耐热和经常经历的环境温度超过55 °C时浮出水面。据推测，表现出高温度敏感性的动物将合成更高水平的mRNA，这将导致更高的能量成本用于热防御。种群表现出显着的地理变化，温度敏感性沿着其范围。E.北方山脉边缘的蜗牛。马六甲和东部山脉南部边缘。辐射组的hsp70表达水平高于从其各自范围的中心群体收集的个体。在物种分布范围边缘的种群中高水平的hsp70 mRNA可能是对局部热环境压力的适应性反应，表明其分布范围边缘的种群对未来全球变暖可能更敏感。
Populations at the edge of their species' distribution ranges are typically living at the physiological extreme of the environmental conditions they can tolerate. As a species' response to global change is likely to be largely determined by its physiological performance, subsequent changes in environmental conditions can profoundly influence populations at range edges, resulting in range extensions or retractions. To understand the differential physiological performance among populations at their distribution range edge and center, we measured levels of mRNA forheat shock protein 70(hsp70) as an indicator of temperature sensitivity in two high-shore littorinid snails,Echinolittorina malaccanaandE. radiata, between 1°N to 36°N along the NW Pacific coast. TheseEchinolittorinasnails are extremely heat-tolerant and frequently experience environmental temperatures in excess of 55 °C when emersed. It was assumed that animals exhibiting high temperature sensitivity will synthesize higher levels of mRNA, which will thus lead to higher energetic costs for thermal defense. Populations showed significant geographic variation in temperature sensitivity along their range. Snails at the northern range edge ofE. malaccanaand southern range edge ofE. radiataexhibited higher levels ofhsp70expression than individuals collected from populations at the center of their respective ranges. The high levels ofhsp70mRNA in populations at the edge of a species' distribution range may serve as an adaptive response to locally stressful thermal environments, suggesting populations at the edge of their distribution range are potentially more sensitive to future global warming.