Biodiversity and structure of marine sponge assemblages around a subtropical island

Autor: Gisele Lôbo-Hajdu, Eduardo L. Esteves, Guilherme Muricy, Humberto F. M. Fortunato, Thiago S. de Paula
Rok vydání: 2020
Předmět:
Zdroj: Hydrobiologia. 847:1281-1299
ISSN: 1573-5117
0018-8158
DOI: 10.1007/s10750-020-04183-4
Popis: We evaluated the structural responses of marine sponge assemblages to different substrates as well as their positioning around Ilha Grande, a local hotspot of marine biodiversity sheltered in a bay area off Southeast Brazil. Sampling sites were distributed between sides of the island facing the continent (North) and ocean (South) across two depth-dependent substrates. As proved by ordination and permutation analyses, these two factors accounted for nearly half the variation observed among assemblages, either with species abundance or coverage area data. Out of 46 OTUs surveyed (~ 3000 individuals), Tedania (Tedania) ignis, Scopalina ruetzleri, and Iotrochota arenosa dominated the community, even though most of the dissimilarity detected among assemblages relied on 20% of the OTUs. The northern side was proved as more diverse, and the south-facing side held more unspecific, putatively new OTUs. Assemblages dwelling on rocky-to-sandy interface bottoms were meager in species number, although they mainly included Dragmacidon reticulatum and the endemic Brazilian sponge Polymastia janeirensis. By highlighting structuring factors operating on Ilha Grande’s sponge assemblage, we hope to support future monitoring surveys on an environment increasingly impacted by human activities over the years.
Databáze: OpenAIRE
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