一种适应寒冷的蚱蜢的表型和遗传分化可能会导致对快速气候变化做出特定品系的反应

IF 4.6 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Fabio Leonardo Meza-Joya, Mary Morgan-Richards, Steven A. Trewick
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引用次数: 0

摘要

目的物种对全球变暖的反应将取决于种内多样性,但有关生物地理变异模式的研究却很少。方法我们利用线粒体序列,使用系统地理学工具和中性统计来研究种群的连通性和人口趋势。度量数据被用来记录表型变异。我们利用生态位指标评估种内生态位变异,并利用生态位建模研究过去和未来情景下的适宜性。结果生态位模型和人口学分析表明,冰川期比间冰期蚱蜢的适宜空间更加有限。ND2 单倍型之间的谱系关系显示,蚱蜢种群存在严重的南北分化,部分与表型和生态位变异一致,这表明在中部火山地区的重新定居过程中,两种生态型发生了混合。随机化的多重矩阵回归表明,气候与表型分化之间存在联系,表型分化是通过腿部和前胸的尺寸推断的,而不是前胸的形状。主要结论S. piliferus目前的分布和种内多样性反映了与第四纪气候和火山活动相一致的复杂生物地理情景。表型分化似乎是适应性的。目前的遗传和表型变异水平表明其具有适应潜力,但未来 50 年人为变暖的速度可能会导致小种群在适应之前就崩溃。种内分化品系之间的生态位特征差异表明,它们对气候变化的反应各不相同,这对确定保护行动和管理策略的优先次序具有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Phenotypic and genetic divergence in a cold-adapted grasshopper may lead to lineage-specific responses to rapid climate change

Phenotypic and genetic divergence in a cold-adapted grasshopper may lead to lineage-specific responses to rapid climate change

Aim

Species responses to global warming will depend on intraspecific diversity, yet studies of factors governing biogeographic patterns of variability are scarce. Here, we investigate the evolutionary processes underlying genetic and phenotypic diversity in the flightless and cold-adapted grasshopper Sigaus piliferus, and project its suitable space in time.

Location

Te Ika-a-Māui Aotearoa—North Island of New Zealand.

Methods

We used mitochondrial sequences to investigate population connectivity and demographic trends using phylogeographic tools and neutrality statistics. Metric data were used to document phenotypic variation using naïve clustering. We used niche metrics to assess intraspecific niche variation, and niche modelling to investigate suitability under past and future scenarios. Multiple matrix regressions with randomization explored the processes contributing to phenotypic differentiation among grasshopper populations.

Results

Niche models and demographic analyses suggest suitable space for this grasshopper was more restricted during glacial than interglacial stages. Genealogical relationships among ND2 haplotypes revealed a deep north–south split partly concordant with phenotypic and niche variation, suggesting two ecotypes that have mixed during recolonisation of the central volcanic region. Multiple matrix regressions with randomization indicate a link between climate and phenotypic differentiation inferred from leg and pronotum dimensions but not pronotum shape. Niche projections predict severe habitat reduction due to climate warming.

Main conclusions

The current distribution and intraspecific diversity of S. piliferus reflect complex biogeographical scenarios consistent with Quaternary climates and volcanism. Phenotypic divergence appears adaptive. Current levels of genetic and phenotypic variation suggest adaptive potential, yet the pace of anthropogenic warming over the next 50 years could result in small populations that may collapse before adapting. Differences in niche features between diverging intraspecific lineages suggest distinct responses to climate change, and this has implications for prioritising conservation actions and management strategies.

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来源期刊
Diversity and Distributions
Diversity and Distributions 环境科学-生态学
CiteScore
8.90
自引率
4.30%
发文量
195
审稿时长
8-16 weeks
期刊介绍: Diversity and Distributions is a journal of conservation biogeography. We publish papers that deal with the application of biogeographical principles, theories, and analyses (being those concerned with the distributional dynamics of taxa and assemblages) to problems concerning the conservation of biodiversity. We no longer consider papers the sole aim of which is to describe or analyze patterns of biodiversity or to elucidate processes that generate biodiversity.
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