Banca de DEFESA: DANIEL ROVIRA PEREIRA TORRES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANIEL ROVIRA PEREIRA TORRES
DATA : 22/02/2019
HORA: 14:00
LOCAL: Laboratório Didático I, DECOL
TÍTULO:

Influence of an incised valley on benthic and fish assemblages on recently described biogenic reefs in NE Brazil.


PALAVRAS-CHAVES:

Benthic community; Fish community; Physical drivers; Incised valley; Island mass effect


PÁGINAS: 40
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Natural communities are structured by physical and biological factors that drives local dynamics of species coexistence. On reef habitats, conditions such as current dynamics, waves, temperature, depth and nutrient availability plays an important role on structuring communities. Nutrient availability is a frequent limitation on marine environments. The island mass effect, for instance, when the allochthonous nutrient supply supports a diverse ecosystem, and the transformation of dissolved organic carbon into particulate matter by sponges (sponge-loop) have an important role on maintaining ecosystems on oligotrophic conditions. Most Brazilian reefs are rocky or sandstone formations with a great influence of continental run-off, being mostly dominated by macroalgae and presenting low coral cover. Biogenic reefs in Brazil occur in the Abrolhos bank and southern Bahia state, presenting high coral cover. Recently, biogenic reefs with high coral cover were geologically described on northern Brazilian coast. We described benthic and fish communities in these reefs using photoquadrats of benthic substrates and visual census of fish community. Three reef areas were chosen around an incised valley on marine floor, a potential pathway for nutrient input to the reefs, exploring variations among reefs at east, west and at the center of the valley. We found higher coral cover and lower macroalgae cover on reefs located within the incised valley. Fish biomass was similar among areas, but biomass distribution differed among functional groups. Invertivores and piscivores biomass was greater on reefs within the valley, potentially resulting from higher food availability resulting from increasing nutrient input. Our results reveal that nutrient inputs from incised valleys may structure reef communities similarly to what happen with the island mass effect. This work contributes to description of biological communities composing these recently described biogenic reefs, elucidates the potential effects of the incised valley on these reefs, and fills a gap on the knowledge on these kind of reef formation in Brazil, generating information that can be further used for guiding management and conservation of those unique ecosystems.


MEMBROS DA BANCA:
Externo à Instituição - CARLOS EDUARDO LEITE FERREIRA - UFF
Presidente - 2319234 - GUILHERME ORTIGARA LONGO
Externo ao Programa - 1149351 - JORGE EDUARDO LINS OLIVEIRA
Interna - 1378974 - LIANA DE FIGUEIREDO MENDES
Notícia cadastrada em: 30/01/2019 09:20
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