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Occurrence and distribution of plasmodial myxomycetes in Hundred Islands National Park , Pangasinan , Philippines

Myxomycetes are a morphologically diverse group of eukaryotic microorganisms. Their unique life cycles and fascinating fruiting bodies make them ideal model organisms for the population study of geographically isolated islands. Our research study therefore assessed the occurrence and distribution of myxomycetes found within seven islands from Hundred Islands National Park, Pangasinan. Moist chambers were prepared for each of collected aerial and ground leaf litter, twigs and dead barks of living trees. The abundance and species distribution were then computed based on the datasets obtained. Results showed that substrates collected from the Century Park Island gave the highest myxomycete yield. Identification of the collected myxomycetes showed a total of 30 species present belonging to ten genera: Arcyria, Collaria, Calomyxa, Comatricha, Diderma, Didymium, Lepidoderma, Perichaena, Physarum, and Stemonitis. The lowest S/G ratio was observed from the Governor’s and Sison Islands indicating high taxonomic diversity. A high CC value was also observed between the Children’s and Monkey Islands suggesting similarity in terms of species composition of these two sites. However, low PS values were recorded. This indicated that the study sites differed in the relative abundance of species. Cluster analysis based on their similarity coefficient values showed similarities in species composition between the islands of Hundred Islands. Two species reported in this study are new records for the Philippines: Lepidoderma tigrinum and Perichaena pedata.