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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Cryptic lineages respond differently to coral bleaching.

Matías Gómez-Corrales1, Carlos Prada1

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Hidden genetic lineages within the mountainous star coral (Orbicella faveolata) show varying heat tolerance. This discovery is crucial for understanding coral reef adaptation to climate change and predicting extinction risks.

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Area of Science:

  • Marine Biology
  • Genetics
  • Climate Change Science

Background:

  • Global coral cover is declining due to rising sea temperatures, leading to coral bleaching and mortality.
  • Coral reef resilience to climate change depends on genetic variation within and among species.
  • Identifying cryptic species is vital as they may exhibit different physiological responses to environmental stressors.

Purpose of the Study:

  • To reanalyze existing data on the mountainous star coral (Orbicella faveolata) to identify cryptic lineages.
  • To assess the physiological potential of different lineages to cope with thermal stress.
  • To understand the implications of cryptic genetic diversity for coral adaptation and extinction risk under climate change.

Main Methods:

  • Reanalysis of quantitative genetic data on thermal stress response in Orbicella faveolata.
  • Identification of cryptic lineages within the studied coral population.
  • Comparison of heat tolerance among identified lineages.

Main Results:

  • The study identified multiple cryptic lineages within Orbicella faveolata, challenging the assumption of a single panmictic population.
  • One identified lineage exhibited significantly lower heat tolerance compared to others.
  • Cryptic lineages were found to co-occur in some locations, with at least one lineage restricted to a single site.

Conclusions:

  • The existence of cryptic lineages within Orbicella faveolata indicates varying extinction risks for these distinct evolutionary groups.
  • Some lineages possess heat tolerance, potentially aiding adaptation to rising ocean temperatures, while others are vulnerable.
  • Accurate species delineation and understanding cryptic genetic diversity are essential for effective coral reef conservation strategies in a changing climate.