PDF(Pubmed)
Abstract：
Desertification is known to be a major threat to biodiversity, yet our understanding of the consequent decline in biodiversity remains insufficient. Here, we predicted climate change-induced range shifts and genetic diversity losses in three model dung beetles: Colobopterus erraticus, Cheironitis eumenes, and Gymnopleurus mopsus, distributed across the Gobi Desert and Mongolian Steppe, areas known for desertification. Phylogeographic analyses of mitochondrial COI sequences and species distribution modeling, based on extensive field investigations spanning 14 years, were performed. Species confined to a single biome were predicted to contract and shift their distribution in response to climate change, whereas widespread species was predicted to expand even if affected by range shifts. We indicated that all species are expected to experience significant haplotype losses, yet the presence of high singleton frequencies and low genetic divergence across geographic configurations and lineages mitigate loss of genetic diversity. Notably, Cheironitis eumenes, a desert species with low genetic diversity, appears to be the most vulnerable to climate change due to the extensive degradation in the Gobi Desert. This is the first study to predict the response of insects to desertification in the Gobi Desert. Our findings highlight that dung beetles in the Gobi Desert and Mongolian Steppe might experience high rates of occupancy turnover and genetic loss, which could reshuffle the species composition.
摘要：
众所周知，荒漠化是对生物多样性的主要威胁，然而，我们对随之而来的生物多样性下降的理解仍然不足。这里,我们预测了三个模型粪甲虫的气候变化引起的范围变化和遗传多样性损失：鳞翅目，大肠埃米烯炎，和木髓,分布在戈壁沙漠和蒙古草原上，以荒漠化闻名的地区。线粒体COI序列和物种分布模型的系统地理学分析，基于历时14年的广泛实地调查，被执行了。预计限制在一个生物群落中的物种会收缩并改变其分布以应对气候变化，而即使受到范围变化的影响，预计广泛的物种也会扩大。我们指出，预计所有物种都会经历显著的单倍型损失，然而，在地理配置和谱系之间，高单例频率和低遗传差异的存在减轻了遗传多样性的丧失。值得注意的是,大肠埃米烯炎，遗传多样性低的沙漠物种，由于戈壁沙漠的广泛退化，似乎最容易受到气候变化的影响。这是第一个预测戈壁沙漠中昆虫对荒漠化反应的研究。我们的发现强调，戈壁沙漠和蒙古草原中的粪甲虫可能会经历较高的入住率和遗传损失率，这可能会重新调整物种组成。
