Three-Dimensional Morphometrics Reveal Patterns of Unionid Shell Variation Along River Gradients

IF 3.4 2区 环境科学与生态学 Q2 ECOLOGY
Irene Sánchez González, Jamie R. Bucholz, Garrett W. Hopper, Jeffrey D. Lozier, Carla L. Atkinson
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引用次数: 0

Abstract

Aim

Understanding the extent of morphological variation across diverse habitats and species can provide valuable insights into how organisms respond to environmental gradients. We quantified intraspecific morphological variation of unionid mussels and assessed how it varied in relation to genetic differentiation and environmental characteristics.

Location

Mobile and Tennessee River Basins, Alabama and Tennessee, U.S.A.

Taxon

Unionid mussels.

Methods

We used innovative three-dimensional (3D) scanning techniques and 3D geometric morphometric analyses, genetic data and environmental variables to quantify morphological variation in seven freshwater mussel species populations and its relationship to genetic differentiation and environmental characteristics.

Results

Our findings indicate that shell morphological variation is correlated with environmental variables in four unionid species, and generally not related to genetic differentiation, improving our understanding of the mechanisms behind morphological variation. Three closely related species were more inflated in larger watersheds, while a more distantly related species, A. plicata, was more compressed in larger watersheds. River bankfull width was a significant factor in all models, highlighting the influence of high flow extremes on shell morphological variation.

Main Conclusions

Our findings suggest that environmental factors, particularly characteristics of river flow regimes, are the primary drivers of intraspecific shell morphological variation in unionid mussels, with genetic differentiation playing a less prominent role. Continuing to explore intraspecific trait variation along river gradients will improve our understanding of the ecological implications of shell morphological variation. Assessing the ability of organisms to morphologically adapt to environmental change can help us understand their resilience.

三维形态计量学揭示了统一壳沿河流梯度变化的模式
目的了解不同生境和物种的形态变异程度可以为了解生物如何响应环境梯度提供有价值的见解。我们量化了统一贻贝的种内形态变异,并评估了其与遗传分化和环境特征的关系。位置移动和田纳西河流域,阿拉巴马州和田纳西州,美国,分类群联合贻贝。方法采用新颖的三维扫描技术、三维几何形态分析、遗传数据和环境变量,定量分析7个淡水贻贝种群的形态变异及其与遗传分化和环境特征的关系。结果4个统一种的壳形态变异与环境变量相关,而与遗传分化无关,加深了对壳形态变异机制的认识。3种亲缘关系较近的种在较大的流域中更容易膨胀,而亲缘关系较远的种a . plicata在较大的流域中更容易被压缩。河岸宽度在所有模型中都是重要的影响因素,突出了高流量极值对贝壳形态变化的影响。本研究结果表明,环境因素,特别是河流水流特征,是统一贻贝种内壳形态变化的主要驱动因素,遗传分化的作用不太突出。继续探索沿河流梯度的种内性状变异将提高我们对贝壳形态变异的生态意义的理解。评估生物体在形态上适应环境变化的能力可以帮助我们了解它们的复原力。
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来源期刊
Journal of Biogeography
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.
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