Ascomycetous yeast communities of marine invertebrates in a Southeast Brazilian mangrove ecosystem

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Abstract
The ascomycetous yeast communities associated with 3 bivalve mollusk, and 4 crab species were studied in the mangrove at Coroa Grande on Sepetiba Bay in Rio de Janeiro, Brazil. These were made up mostly of diverse but sparse and apparently allochtonous yeast populations. The striking exception was a prevalent population of the speciesKluyveromyces aestuarii, which predominated the yeast communities of 2 detritus feeding crabs,Sesarma rectum andUca spp., and the shipwormNeoteredo reynei. However,K. aestuarii was absent from the omnivorous crabsAratus pisonii andGoniopsis cruentata, and the clamAnomalocardia brasiliana, and was rare in the clamTagelus plebeius from mostly submerged more sandy sediments.Pichia membranaefaciens, Candida valida-like,Candida krusei, Candida sorbosa, Candida colliculosa-like,Candida famata-like,Kloeckera spp.,Candida guilliermondii, Candida albicans, Candida silvae, Geotrichum spp.,Rhodotorula spp.,Cryptococcus spp., and the methylotrophic yeastCandida boidinii were frequently isolated. The 322 ascomycetous yeast cultures representing 252 isolates from crabs and mollusks were classified as 40 species that fit standard descriptions, and 44 putative new species. The ascomycetous yeast communities of the mangrove ecosystem include many new biotypes that require better taxonomic definition.