Scholarlink

Background <p>Crown-of-thorns seastars (COTS, <i>Acanthaster</i> spp.) are the most notorious coral predators, whose devastating outbreaks cause recurrent and extensive coral depletion across Indo-Pacific reefs. However, the spread potential of COTS outbreaks and the anthropogenic role in their initiation have remained a subject of intense debate for over five decades.</p> Results <p>Here, using low-coverage whole-genome sequences of 247 COTS, we show that Pacific COTS populations are highly structured, indicating that outbreaks do not spread through open ocean, but instead are locally derived. Pacific COTS populations are grouped in three main lineages geographically restricted to Hawai‘i, French Polynesia, and the West Pacific, with the latter showing further significant genetic substructure. Phylogenomic analyses indicated that the Hawai‘i COTS lineage likely represents a different undescribed species and challenged the species status of both <i>A.</i> cf. <i>solaris</i> and the Eastern Pacific COTS species (<i>A. ellisii</i>), as the latter appeared as the sister group of the French Polynesia COTS lineage. Additionally, we show that current COTS populations present the highest effective sizes of the last million years, suggesting that human and/or climate change may influence COTS population sizes.</p> Conclusions <p>Overall, our study highlights the improvements brought by low-coverage whole-genome sequencing approaches in resolving the phylogeny and connectivity patterns of a keystone species in understudied regions of the Pacific Ocean.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Genomic analyses support locally derived crown-of-thorns seastar outbreaks in the Pacific

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年8月6日

查看全文
  • Carlos Leiva,
  • Marta Martín-Huete,
  • Sarah Lemer

摘要

Background

Crown-of-thorns seastars (COTS, Acanthaster spp.) are the most notorious coral predators, whose devastating outbreaks cause recurrent and extensive coral depletion across Indo-Pacific reefs. However, the spread potential of COTS outbreaks and the anthropogenic role in their initiation have remained a subject of intense debate for over five decades.

Results

Here, using low-coverage whole-genome sequences of 247 COTS, we show that Pacific COTS populations are highly structured, indicating that outbreaks do not spread through open ocean, but instead are locally derived. Pacific COTS populations are grouped in three main lineages geographically restricted to Hawai‘i, French Polynesia, and the West Pacific, with the latter showing further significant genetic substructure. Phylogenomic analyses indicated that the Hawai‘i COTS lineage likely represents a different undescribed species and challenged the species status of both A. cf. solaris and the Eastern Pacific COTS species (A. ellisii), as the latter appeared as the sister group of the French Polynesia COTS lineage. Additionally, we show that current COTS populations present the highest effective sizes of the last million years, suggesting that human and/or climate change may influence COTS population sizes.

Conclusions

Overall, our study highlights the improvements brought by low-coverage whole-genome sequencing approaches in resolving the phylogeny and connectivity patterns of a keystone species in understudied regions of the Pacific Ocean.