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Hybridization patterns and evolutionary clues in broad‐snouted caiman and yacare caiman: Insights from phylogeographic and ecological analyses

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Bibliographic Details
Title: Hybridization patterns and evolutionary clues in broad‐snouted caiman and yacare caiman: Insights from phylogeographic and ecological analyses
Authors: G. Pacheco‐Sierra, P. Amavet, P. Siroski, C. Piña, C. Patrón‐Rivero, C. Yáñez‐Arenas
Source: Journal of Zoology. 326:214-230
Publisher Information: Wiley, 2025.
Publication Year: 2025
Subject Terms: ECOLOGICAL NICHE MODELING, CROCODILIA, INTROGRESSIVE HYBRIDIZATION, CAIMAN LATIROSTRIS, SPECIES BOUNDARIES, CAIMAN YACARE, GENETIC EXCHANGE, SYMPATRIC
Description: Our study explores the dynamics of introgressive hybridization between two sympatric crocodilian species, Caiman latirostris and Caiman yacare, shedding light on the ongoing genetic exchange. Hybrid individuals exhibit a notable absence of distinct boundaries between parental and hybrid forms, potentially influenced by factors like limited dispersal potential or unexplored extrinsic variables. Despite sympatric coexistence, the species occupy distinct ecological niches, limiting hybridization. Climatic factors, particularly during autumn and winter, may further impact migration and energy allocation, contributing to the observed introgression pattern. Significantly, the prevalence of individuals with hybrid index values indicates introgressive hybridization between C. yacare and C. latirostris populations, supported by ecological niche models that found wide areas with potential for hybridization across much of their distribution. The range of hybrid index values suggests gene flow and the transfer of adaptive traits through hybridization. The divergence between C. yacare and C. latirostris, approximately 26 million years ago, aligns with geological and climatic changes during the Oligocene. Furthermore, our findings support a directional radiation pattern in C. latirostris populations from south to north, influenced by climatic changes and ecological niche shifts. This study revealed the dynamics of introgressive hybridization between C. yacare and C. latirostris, emphasizing the complex interplay of ecological, temporal, and environmental factors in shaping genetic patterns and evolutionary history.
Document Type: Article
File Description: application/pdf
Language: English
ISSN: 1469-7998
0952-8369
DOI: 10.1111/jzo.70013
Access URL: http://hdl.handle.net/11336/273693
Rights: Wiley Online Library User Agreement
CC BY NC SA
Accession Number: edsair.doi.dedup.....b10d2a4a0197f65287f27616ab5dd65e
Database: OpenAIRE
Description
Abstract:Our study explores the dynamics of introgressive hybridization between two sympatric crocodilian species, Caiman latirostris and Caiman yacare, shedding light on the ongoing genetic exchange. Hybrid individuals exhibit a notable absence of distinct boundaries between parental and hybrid forms, potentially influenced by factors like limited dispersal potential or unexplored extrinsic variables. Despite sympatric coexistence, the species occupy distinct ecological niches, limiting hybridization. Climatic factors, particularly during autumn and winter, may further impact migration and energy allocation, contributing to the observed introgression pattern. Significantly, the prevalence of individuals with hybrid index values indicates introgressive hybridization between C. yacare and C. latirostris populations, supported by ecological niche models that found wide areas with potential for hybridization across much of their distribution. The range of hybrid index values suggests gene flow and the transfer of adaptive traits through hybridization. The divergence between C. yacare and C. latirostris, approximately 26 million years ago, aligns with geological and climatic changes during the Oligocene. Furthermore, our findings support a directional radiation pattern in C. latirostris populations from south to north, influenced by climatic changes and ecological niche shifts. This study revealed the dynamics of introgressive hybridization between C. yacare and C. latirostris, emphasizing the complex interplay of ecological, temporal, and environmental factors in shaping genetic patterns and evolutionary history.
ISSN:14697998
09528369
DOI:10.1111/jzo.70013