Microclimatic buffering and resource‐based habitat in a glacial relict butterfly: significance for conservation under climate change
Microclimatic buffering and resource‐based habitat in a glacial relict butterfly: significance for conservation under climate change
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冰川遗迹蝴蝶的小气候缓冲和资源型栖息地：气候变化下保护的意义
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Van Dyck
中科院分区：
文献类型：
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作者：
C. Turlure;Julie Choutt;M. Baguette;H. Van Dyck
与已经显示出活动范围因气候变化而向北方转移的几种生物不同，南方残存物种的种群被困在孤立的海拔栖息地。因此，人们越来越有兴趣更好地了解它们的栖息地用途，特别是关注它们的热方面及其对栖息地管理的相关意义。我们通过研究泥炭沼泽生态系统中冰川时期残留的蝴蝶的植被结构和小气候对幼虫栖息地的利用来解决这个问题，采用基于资源的功能性栖息地方法。我们分析了毛虫的存在和密度与植被组成(反映泥炭沼泽的湿度、温度和自然演替的梯度)以及毛虫热避难所的可用性和质量(即由泥炭沼泽提供的结构)的关系。我们还测试了毛虫在不同温湿度处理下的存活率。(2)泥炭沼泽中缺乏泥炭沼泽的幼虫栖息地适宜性降低，从而降低了种群密度；(3)泥炭沼泽较少潮湿、退化的部分或演替后期，泥炭沼泽泥炭沼泽的热缓冲能力降低。幼虫饲养试验表明，温度对毛虫存活率有显著影响，温度越低，存活率越高。我们的野外和实验室结果支持这样的观点，即毛虫开发的热环境应被视为一种功能性资源，并包括在特定种群的栖息地定义中。对这种冰川残存物种的泥炭沼泽栖息地进行适当的管理，不仅应侧重于幼虫和成体的摄食资源，还应侧重于泥炭沼泽湿润地带的泥炭沼泽所提供的热避难所的质量，特别是在当前气候变暖的关键背景下。
In contrast to several organisms that have already shown range shifts to the north as a response to climate change, southern populations of relict species are trapped in isolated altitudinal habitats. Therefore, there is a growing interest to better understand their habitat use, with particular attention to the thermal aspects and associated significance for their habitat management. We address this issue by a study of larval habitat use relative to vegetation structure and microclimate in a glacial relict butterfly of peat bog ecosystems, using a functional, resource‐based habitat approach. We analysed caterpillar presence and density relative to vegetation composition (reflecting gradients of humidity, temperature, and natural succession of the peat bog) and to the availability and quality of thermal refuges for caterpillars (i.e., structures provided by Sphagnum hummocks). We also tested caterpillar survival rates under different temperature and humidity treatments. We found that (1) Boloria aquilonaris was a specialist butterfly of early successional stages with very humid zones of peat bog, (2) the lack of Sphagnum hummocks reduced larval habitat suitability, and hence the population density, and (3) a reduction of the thermal buffering ability of Sphagnum hummocks was observed in less humid, degraded parts, or late‐successional stages of peat bog. A larval rearing experiment showed a significant impact of temperature on caterpillar survival; survival being higher at lower temperature. Our field and laboratory results support the idea that the thermal environment exploited by caterpillars should be considered as a functional resource and included in a population‐specific habitat definition. Appropriate management of the peat bog habitat of this glacial relict species should not exclusively focus on the larval and adult feeding resources, but also on the quality of thermal refuges provided by Sphagnum hummocks in humid zones of the peat bog, especially in the current critical context of climate warming.
影响因子：
3.4
作者：
S. Best A
通讯作者：
S. Best A