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| Main Authors: | , , , , |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Biology
2025
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| Online Access: | https://pubmed.ncbi.nlm.nih.gov/41463555/ |
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Table of Contents:
- Contrasting Evolutionary Trajectories: Differential Population Dynamics and Gene Flow Patterns in Sympatric and . Tong, Yichao Liu, Wei Sun, Yuqing Liu, Jinlin Yang, Qunhui Calcareous tropical green macroalgae of the genus are key reef-builders, yet the drivers of their diversification and population dynamics remain poorly understood. This study analyzed the species diversity of in the Xisha (Paracel) Islands based on A gene sequences, focusing on evaluating the genetic diversity, population structure, and historical dynamics of two widespread species- and . The results indicate new records of and cf. in the Xisha (Paracel) Islands. More importantly, and exhibited significantly different evolutionary histories. Specifically, showed a highly fragmented population structure, restricted gene flow, and a multimodal mismatch distribution, suggesting a complex historical process or long-term stability. In contrast, exhibited lower population differentiation, extensive gene flow, and non-significant neutrality test results, indicating long-term demographic stability without recent, drastic population events. Further validation based on gene flow analysis and divergence time estimation revealed that the lineage divergence of is older, while represents a lineage with a relatively younger evolutionary origin restricted to the Indo-Pacific region. This striking dichotomy clearly illustrates the interplay between intrinsic species-specific traits (e.g., dispersal capacity) and extrinsic historical factors (e.g., paleo-oceanographic events), leading to contrasting evolutionary outcomes among widespread marine taxa. By elucidating how differing evolutionary histories influence patterns of genetic diversity, this study provides a predictive framework for evaluating the resilience and guiding conservation priorities for critical marine calcifiers in the context of rapid environmental change.