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Scale-dependent effects of terrestrial habitat on genetic variation in the great crested newt (Triturus cristatus)
Landscape Ecology ( IF 5.2 ) Pub Date : 2021-07-05 , DOI: 10.1007/s10980-021-01297-5
Karen Cox 1 , Leen Verschaeve 1 , An Van Breusegem 1 , David Halfmaerten 1 , Mathieu Denoël 2 , Hans Van Calster 3 , Jeroen Speybroeck 3 , Dries Adriaens 3 , Gerald Louette 3 , Sam Van de Poel 4 , Iwan Lewylle 4
Affiliation  

Context

Terrestrial landscapes surrounding aquatic habitat influence the persistence of amphibian spatially structured populations (SSPs) via their crucial role in providing estivation and overwintering sites, facilitating or hampering dispersal and colonisation, and consequently the maintenance or loss of genetic diversity.

Objectives

To highlight the landscape drivers of genetic variation, we investigated the relationship between the level of genetic variation measured within ponds of the great crested newt (Triturus cristatus), and the composition of the surrounding landscape at various spatial scales.

Methods

Based on the sampling of 40 ponds in 13 SSPs, the influence of landscape features on several estimators of genetic variation was investigated via linear mixed models, with effects within and between SSPs incorporated.

Results

The best models depended on the spatial scale, with more significant associations within radii of 50 and 100 m of core ponds, particularly for allelic richness. Responses within and between SSPs were mostly similar. The availability of aquatic habitat in the landscape had a positive effect, while woodland, arable land and pasture had different effects depending on scale and response variable. Total length of roads within a 250 m radius influenced effective population size negatively.

Conclusions

Our results stress the need to investigate the influence of environmental predictors at multiple spatial scales for an adequate understanding of ongoing processes. Generally, the landscape affected genetic variation similarly within and between SSPs. This allowed us to provide general guidelines for the persistence of great crested newt populations, with an emphasis on the importance of the aquatic habitat.



中文翻译:

陆地栖息地对大凤头蝾螈(Triturus cristatus)遗传变异的规模依赖性影响

语境

水生栖息地周围的陆地景观影响两栖动物空间结构种群 (SSP) 的持久性,因为它们在提供夏眠和越冬场所、促进或阻碍扩散和定殖以及因此维持或丧失遗传多样性方面的关键作用。

目标

为了突出遗传变异的景观驱动因素,我们研究了在大凤头蝾螈(Triturus cristatus)池塘内测量的遗传变异水平与不同空间尺度上周围景观组成之间的关系。

方法

基于对 13 个 SSP 中 40 个池塘的抽样,通过线性混合模型研究了景观特征对几个遗传变异估计量的影响,并纳入了 SSP 内部和之间的影响。

结果

最佳模型取决于空间尺度,在 50 和 100 m 核心池塘半径内具有更显着的关联,尤其是等位基因丰富度。SSP 内部和之间的反应大多相似。景观中水生栖息地的可用性具有积极的影响,而林地、耕地和牧场根据规模和响应变量具有不同的影响。250 m 半径内的道路总长度对有效人口规模产生负面影响。

结论

我们的结果强调需要在多个空间尺度上调查环境预测因子的影响,以充分了解正在进行的过程。一般来说,景观对 SSP 内部和之间的遗传变异的影响类似。这使我们能够为大凤头蝾螈种群的持久性提供一般指导,并强调水生栖息地的重要性。

更新日期:2021-07-05
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