Weight-Length Ratio of Piranhas Serrasalmus (Characiformes, Serrasalmidae) in Bolivia: Relationships to Molecular Divergence and Maximum Size?

IF 2.3 2区生物学 Q2 ECOLOGY

Ecology and Evolution Pub Date : 2025-10-07 DOI:10.1002/ece3.70970

Fernando M. Carvajal-Vallejos, Flavio Gallo-Cardozo, Matías Careaga, Melina Campero

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Abstract

Weight-Length Relationships (WLRs) provide a basis for comparing life history strategies and morphological differentiation among fish species, potentially linking slope variations to evolutionary divergences in size and weight. This study presents the WLRs of nine Serrasalmus piranha species from the Amazon and La Plata basins in Bolivia, assessing whether WLRs slopes are influenced by phylogenetic relationships using a phylogenetic mixed model analysis on the mitochondrial DNA COI (barcoding) locus. All species demonstrated an exponential (power-type) growth pattern, with most showing positive allometric growth. The species showing the greatest differentiation in both WLRs and genetic variation was S. elongatus. We detected a strong phylogenetic signal in WLR slopes, though clustering techniques for WLRs slopes and molecular data revealed only partial concordance. We discuss how these concordances and discrepancies between WLRs and genetic data may reflect ancient and intermediate speciation events, shaped by habitat conditions and stochastic evolutionary processes. Such processes appear to influence swimming mechanisms and ecological niche navigation in these closely related Serrasalmus species.

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玻利维亚Serrasalmus（特征，Serrasalmidae）食人鱼的重长比：与分子分化和最大尺寸的关系？

体重-长度关系（WLRs）为比较鱼类之间的生活史策略和形态分化提供了基础，可能将坡度变化与大小和重量的进化差异联系起来。本研究利用线粒体DNA COI（条形码）位点的系统发育混合模型分析，分析了来自玻利维亚亚马逊河流域和拉普拉塔盆地的九种水虎鱼（Serrasalmus piranha）的WLRs，并评估了WLRs斜率是否受到系统发育关系的影响。所有物种均表现为指数型（幂型）生长模式，大多数物种表现为正异速生长。在WLRs和遗传变异上均表现出最大分化的种是长叶葡萄。我们在WLR斜坡中检测到强烈的系统发育信号，尽管WLR斜坡的聚类技术和分子数据仅显示部分一致性。我们讨论了wlr和遗传数据之间的一致性和差异如何反映了受栖息地条件和随机进化过程影响的古代和中期物种形成事件。这些过程似乎影响了这些密切相关的沙蚕物种的游泳机制和生态位导航。

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来源期刊

Ecology and Evolution ECOLOGY-

CiteScore

4.40

自引率

3.80%

发文量

1027

审稿时长

3-6 weeks

期刊介绍： Ecology and Evolution is the peer reviewed journal for rapid dissemination of research in all areas of ecology, evolution and conservation science. The journal gives priority to quality research reports, theoretical or empirical, that develop our understanding of organisms and their diversity, interactions between them, and the natural environment. Ecology and Evolution gives prompt and equal consideration to papers reporting theoretical, experimental, applied and descriptive work in terrestrial and aquatic environments. The journal will consider submissions across taxa in areas including but not limited to micro and macro ecological and evolutionary processes, characteristics of and interactions between individuals, populations, communities and the environment, physiological responses to environmental change, population genetics and phylogenetics, relatedness and kin selection, life histories, systematics and taxonomy, conservation genetics, extinction, speciation, adaption, behaviour, biodiversity, species abundance, macroecology, population and ecosystem dynamics, and conservation policy.