Banca de QUALIFICAÇÃO: PRISCILA DE CERQUEIRA VERAS

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : PRISCILA DE CERQUEIRA VERAS
DATA : 11/11/2019
HORA: 14:00
LOCAL: UFABC Campus Santo André
TÍTULO:

Variables predicting de diversity associated with the word largest rhodolith bed: Abrolhos Bank

PÁGINAS: 65
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
RESUMO:

Rhodolithic beds are seabed covered by “free-living” nodules composed of more than 50% of non-geniculate coralline red algae. These ecosystems have a recognized ecological importance and the increase anthropic activities has threatened its biodiversity. Gaps in knowledge about these ecosystems have generated a mismatch between socioeconomic progress and conservation measures. Thus, we aim to understand the role of different variables (i.e. average diameter, volume, density, complexity, depth, continental shelf distance, latitude, macroalgae biomass, weight and type of sediment) in structuring macroinvertebrate communities associated with rhodoliths from Abrolhos Bank. For this, we individually sampled 131 rhodoliths using nylon bags (500µm mesh) in eight areas of the Bank. In the laboratory, the epibiontes were removed from 104 rhodoliths and 7631 macroinvertebrates obtained were identified and quantified in 28 major taxonomic groups, in which Amphipoda (2570 specimens), Polychaeta (2118) and Isopoda (605) were the most representative taxa. The largest and smallest abundances of macroinvertebrates were observed in the sample sites located in the Parque Nacional Marinho do banco dos Abrolhos (39.10 ± 55.35 and 110.50 ± 87.49 macroinvertebrates.rhodolith^-1, mean ± standard deviation). The patterns found for macroinvertebrate communities were explained by average diameter, depth, distance from the coast and percentage of aragonite in the sediment. Larger rhodoliths had a higher number of associated specimens and were obtained predominantly at deeper sites. The characteristics of the Abrolhos continental shelf probably contribute to the growth of calcareous algae even in regions with high depths. Besides that, the narrow north portion from the platform allows deeper locations to be closer to the coast and more exposed to the influence of lithogenic sediments. Finally, changes in calcium carbonate polymorphic concentrations can indicate the presence of other reef-building organisms in the southern portions of Abrolhos Bank. These results will be better understood with the finalization of the laboratory steps that are planned for the coming months. Thereby, we can predict if there is negligence about macroinvertebrate biodiversity associated with the rhodoliths of Abrolhos and if conservation strategies are being directed to areas of minor biological relevance.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 096.579.927-10 - GUILHERME HENRIQUE PEREIRA FILHO - USP
Membro Titular - Examinador(a) Interno ao Programa - 1763449 - FERNANDO ZANIOLO GIBRAN
Membro Titular - Examinador(a) Externo à Instituição - LEONARDO MITRANO NEVES
Membro Suplente - Examinador(a) Interno ao Programa - 1762351 - NATALIA PIRANI GHILARDI LOPES
Membro Suplente - Examinador(a) Externo à Instituição - LEONARDO QUEROBIM YOKOYAMA - UNIFESP