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<p>Saprotrophic oomycetes of mangroves are a poorly understood group of eukaryotic <i>Straminipila</i>. As recent phylogenetic analyses revealed, they seem rather diverse, with several recently discovered lineages. However, their prevalence, ecological preferences, and succession on substrates have hardly been studied aside from one early study with limited sampling. Thus, the aim of this study was to provide preliminary insights into these topics based on oomycetes isolated from mangrove leaf litter of various stages of decay, using a culture-based approach. Identification was based on sporulation characteristics and phylogenetic analysis of ITS (internal transcribed spacers of rDNA). A total of 547 axenic strains representing 15 taxa were isolated from a mangrove leaf litter sampled in different parts of the Philippines. Of these, five species were conspecific to known barcoded taxa, two were recently introduced taxa, and eight lineages represented undescribed oomycete species. Alpha diversity analysis revealed that the yellow–brown decay stage harbored the highest number of oomycete species, whereas the beta community analysis suggested that in terms of the number of isolated strains, the four stages of leaf decay suggest overlapping species richness. While some oomycetes could only be isolated a single time, others were highly prevalent and found in all locations sampled. This highlights that mangrove oomycetes are diverse both in terms of their ecological preferences and abundance patterns.</p>

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Diversity and composition of oomycetes in different stages of leaf senescence: a culture-based case study on mangroves of the Philippine archipelago

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  • 发表日期：

    2025年5月13日

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  • Reuel M. Bennett,
  • Nikki Heherson A. Dagamac,
  • Bora Nam,
  • Niño Andree Louis E. Caguimbal,
  • Gina R. Dedeles,
  • Marco Thines

摘要

Saprotrophic oomycetes of mangroves are a poorly understood group of eukaryotic Straminipila. As recent phylogenetic analyses revealed, they seem rather diverse, with several recently discovered lineages. However, their prevalence, ecological preferences, and succession on substrates have hardly been studied aside from one early study with limited sampling. Thus, the aim of this study was to provide preliminary insights into these topics based on oomycetes isolated from mangrove leaf litter of various stages of decay, using a culture-based approach. Identification was based on sporulation characteristics and phylogenetic analysis of ITS (internal transcribed spacers of rDNA). A total of 547 axenic strains representing 15 taxa were isolated from a mangrove leaf litter sampled in different parts of the Philippines. Of these, five species were conspecific to known barcoded taxa, two were recently introduced taxa, and eight lineages represented undescribed oomycete species. Alpha diversity analysis revealed that the yellow–brown decay stage harbored the highest number of oomycete species, whereas the beta community analysis suggested that in terms of the number of isolated strains, the four stages of leaf decay suggest overlapping species richness. While some oomycetes could only be isolated a single time, others were highly prevalent and found in all locations sampled. This highlights that mangrove oomycetes are diverse both in terms of their ecological preferences and abundance patterns.