Linking landscape and genetic variation in the heterogeneous Yungas Andean forest' hotspot: a multi taxa approach

IF 3.4 2区环境科学与生态学 Q2 ECOLOGY

Journal of Biogeography Pub Date : 2024-04-15 DOI:10.1111/jbi.14845

Lara Inés Baccaro, Mauricio Sebastián Akmentins, Cecilia G. García, Juan José Martínez

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引用次数: 0

Abstract

Aim

The factors that influence the diversity of Yungas Andean forest remain unexplored. Our study seeks to investigate the impact of key isolating factors on the genetic structure of multiple taxa, testing for four hypotheses: isolation by distance (IBD), isolation by resistance due to topography (IBRtopo), isolation by resistance due to habitat suitability (IBRsuit) and isolation by environmental dissimilarity (IBE).

Location

Yungas Andean forest.

Taxon

Tetrapoda.

Methods

We analysed a dataset consisting of 477 Cyt-b sequences from 138 localities, encompassing 13 species. Through multiple matrix regression, Moran Spectral Randomization of Mantel and GDM analyses, we tested the impact of each extrinsic predictor on observed genetic variation and determined the effect size of environmental variation on genetic divergence. Additionally, we investigated the spatial distribution of lineages within the study species.

Results

The genetic variation within the Yungas exhibited varied responses that correspond to the regional landscape heterogeneity. We identified different isolating factors as the main predictor for specific species: IBD for Akodon spegazzinii; IBRtopo for certain small mammals' species; IBE for Thylamys cinderella and Oligoryzomys brendae; and IBRsuit for Calomys fecundus, Oreobates barituensis and Melanophryniscus rubriventris with some considerations. Furthermore, our results support the presence of a latitudinal pattern in the distribution of genetic lineages.

Main Conclusions

The heterogeneous landscape of the Yungas Andean forest posed varied effects on genetic variation. The effect of topography and continuity of suitable habitats over vertebrate dispersal shapes the genetic diversity, in particular topography acts either as a barrier or as corridor, while habitat suitability resistance mainly shapes endemism genetic structure; local climate represents a strong genetic promoter in transition zones; and the effect of geographic distance is less evident when considering other landscape promoter of genetic divergence. This reinforces the understanding that the complex interplay of environmental and historical factors contributes to the observed patterns of genetic diversity in this region.

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将 "安第斯森林 "异质热点地区的地貌与遗传变异联系起来：一种多分类群方法

目的：影响永加斯安第斯森林多样性的因素仍有待探索。我们的研究旨在探究主要隔离因素对多个类群遗传结构的影响，并检验了四个假设：距离隔离（IBD）、地形阻力隔离（IBRtopo）、栖息地适宜性阻力隔离（IBRsuit）和环境差异隔离（IBE）。方法我们分析了来自 138 个地点的 477 个 Cyt-b 序列数据集，包括 13 个物种。通过多元矩阵回归、Moran Spectral Randomization of Mantel 和 GDM 分析，我们检验了每个外在预测因子对观察到的遗传变异的影响，并确定了环境变异对遗传变异的影响大小。此外，我们还调查了研究物种内世系的空间分布。结果永加斯地区的遗传变异表现出与区域景观异质性相对应的不同反应。我们发现不同的隔离因素是特定物种的主要预测因素：Akodon spegazzinii的IBD；某些小型哺乳动物物种的IBRtopo；Thylamys cinderella和Oligoryzomys brendae的IBE；以及Calomys fecundus、Oreobates barituensis和Melanophryniscus rubriventris的IBRsuit。此外，我们的研究结果还支持遗传系分布存在纬度模式。地形和适宜栖息地的连续性对脊椎动物扩散的影响决定了遗传多样性，尤其是地形既可作为屏障，也可作为走廊，而栖息地的适宜性阻力主要决定了特有性遗传结构；在过渡区，当地气候对遗传有很强的促进作用；考虑到其他景观对遗传分化的促进作用，地理距离的影响并不明显。这加深了人们的理解，即环境和历史因素的复杂相互作用促成了在该地区观察到的遗传多样性模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Biogeography 环境科学-生态学

CiteScore

7.70

自引率

5.10%

发文量

203

审稿时长

2.2 months

期刊介绍： Papers dealing with all aspects of spatial, ecological and historical biogeography are considered for publication in Journal of Biogeography. The mission of the journal is to contribute to the growth and societal relevance of the discipline of biogeography through its role in the dissemination of biogeographical research.