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<p>The euendolithic algae <i>Ostreobium </i>spp<i>.</i> (Bryopsidales: Chlorophyta) are the primary cause of tropical reef dissolution among microbioeroders. In the current context of widespread decline of coral reefs in the Caribbean, a better understanding of the associations that exist between bioeroders and corals is needed to accurately anticipate the future of these ecosystems. Here, we survey the diversity of the microbioeroder <i>Ostreobium</i> (<i>rbcL</i> marker) and its distribution in the most common families in the Southwestern Caribbean corals within a depth gradient. The <i>Ostreobium rbcL</i> clades were found to be linked with corals belonging to the Agariciidae, Merulinidae, Poritiidae, Siderastreidae, Astroconeiidae, Montastreidae, Mussidae, and Pocilloporidae families. The individuals selected for the current investigation are categorized as members of either the “complex” or “robust” coral groups. Our findings indicate that solely the corals categorized as “complex” exhibit close memberships with the three <i>Ostreobium</i> superclades. In general, the dispersion of <i>Ostreobium</i> within the Southwestern Caribbean region exhibits differentiation among various coral groups and is influenced by geographical and bathymetric factors. The diversity of <i>Ostreobium</i> is primarily composed of ecological specialists, wherein most clades are linked to particular hosts. Conversely, only a few ecological generalists are associated with multiple hosts, akin to zooxanthellae. <i>Ostreobium</i> exhibits greater diversity on encrusting corals such as agariciids, which are among the most abundant and widespread coral species in the Caribbean.</p>

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Diversity and distribution of the coral-associated endolithic algae Ostreobium in the Southwestern Caribbean

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Adriana Rodríguez-Bermúdez,
  • Shaliny Ramírez-Palma,
  • Juan Sebastián Giraldo Vaca,
  • Laura María Diaz-Puerto,
  • Juan Armando Sánchez

摘要

The euendolithic algae Ostreobium spp. (Bryopsidales: Chlorophyta) are the primary cause of tropical reef dissolution among microbioeroders. In the current context of widespread decline of coral reefs in the Caribbean, a better understanding of the associations that exist between bioeroders and corals is needed to accurately anticipate the future of these ecosystems. Here, we survey the diversity of the microbioeroder Ostreobium (rbcL marker) and its distribution in the most common families in the Southwestern Caribbean corals within a depth gradient. The Ostreobium rbcL clades were found to be linked with corals belonging to the Agariciidae, Merulinidae, Poritiidae, Siderastreidae, Astroconeiidae, Montastreidae, Mussidae, and Pocilloporidae families. The individuals selected for the current investigation are categorized as members of either the “complex” or “robust” coral groups. Our findings indicate that solely the corals categorized as “complex” exhibit close memberships with the three Ostreobium superclades. In general, the dispersion of Ostreobium within the Southwestern Caribbean region exhibits differentiation among various coral groups and is influenced by geographical and bathymetric factors. The diversity of Ostreobium is primarily composed of ecological specialists, wherein most clades are linked to particular hosts. Conversely, only a few ecological generalists are associated with multiple hosts, akin to zooxanthellae. Ostreobium exhibits greater diversity on encrusting corals such as agariciids, which are among the most abundant and widespread coral species in the Caribbean.