Metabolic Diversity of a Widely Distributed Tropical Freshwater Crab Is Not Underpinned by Genetic Differences

IF 3.4 2区环境科学与生态学 Q2 ECOLOGY

Journal of Biogeography Pub Date : 2025-04-26 DOI:10.1111/jbi.15147

Lucy M. Turner, Christopher J. Thorpe, Michael Collins, Smrithy Raj, Tripti Shukla, John I. Spicer, Mairi E. Knight, Dheeraj Sharma, Krushnamegh Kunte

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引用次数: 0

Abstract

Aim

The aim of this study was to understand the interplay between local and regional factors as drivers of population physiological diversity in a tropical freshwater crab species.

Location

Western Ghats, south-west India.

Taxon

Barytelphusa cunicularis, Brachyura, Crustacea.

Methods

We applied an integrative approach combining population genetics and whole animal physiology, using the tropical freshwater crab Barytelphusa cunicularis as our model species. We tested for effects of population location (e.g., latitude, altitude), season (as a proxy for rainfall and water temperature) and/or warming on indices of whole animal respiratory physiology (metabolic rate, MO₂) and hypoxic performance (P_crit, i.e., the PO₂ at which routine MO₂ can no longer be sustained) in five widely distributed populations of this species. We also generated population genetic data (mtDNA COI and nDNA histone H3 sequences) to determine the extent of any population genetic structuring and/or cryptic species diversity present to verify that we were investigating a single species.

Results

Despite a high level of genetic structuring between the different populations of B. cunicularis examined, the genetic distances observed were consistent with intra- and not interspecific differences in freshwater crabs. Populations varied in the diversity of the physiological (MO₂) responses observed. There were significant effects of season and population on respiration in response to temperature and P_crit in response to acute hypoxia.

Main Conclusions

We conclude that local environmental factors are important in shaping physiological diversity between populations in tropical freshwater species and systems. This highlights the need to include population-level responses in any projections we make on how biodiversity will respond to ongoing and future environmental changes, including those caused by climate change.

Abstract Image

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一种广泛分布的热带淡水蟹的代谢多样性不是由遗传差异决定的

目的研究热带淡水蟹种群生理多样性的局地因子和区域因子之间的相互作用。位置：西高止山脉，印度西南部。长柄长尾藻分类群，短尾目，甲壳纲。方法采用群体遗传学和全动物生理学相结合的方法，以热带淡水蟹梭子蟹（Barytelphusa cunicularis）为模型种。我们测试了种群位置（如纬度、海拔）、季节（代表降雨量和水温）和/或变暖对整个动物呼吸生理指标（代谢率，MO2）和缺氧性能（Pcrit，即PO2不能再维持常规MO2）的影响。我们还生成了群体遗传数据（mtDNA COI和nDNA组蛋白H3序列），以确定任何群体遗传结构的程度和/或存在的隐物种多样性，以验证我们正在调查单个物种。结果尽管不同种群间的遗传结构较高，但观察到的遗传距离与淡水蟹的种内而非种间差异一致。种群在观察到的生理（MO2）反应多样性方面存在差异。季节和种群对温度响应呼吸和急性缺氧响应Pcrit有显著影响。结论局部环境因素在热带淡水物种和系统种群间生理多样性的形成中起着重要作用。这突出表明，在我们预测生物多样性将如何应对当前和未来的环境变化（包括气候变化引起的环境变化）时，有必要将人口层面的反应纳入其中。

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.