| Texto completo | |
| Autor(es): Mostrar menos - |
Sousa, Silvia Helena Mello
;
Yamashita, Cintia
;
Vicente, Thaisa Marques
;
Mendes, Rafaela Nogueira Mendonca
;
Licari, Laetitia
;
Martins, Maria Virginia Alves
;
Kim, Bianca Sung Mi
;
Millo, Christian
;
Carreira, Renato
;
Montoya-Montes, Isabel
;
Kaminski, Michael A.
;
Mahiques, Michel Michaelovitch
Número total de Autores: 12
|
| Tipo de documento: | Artigo Científico |
| Fonte: | DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS; v. 204, p. 19-pg., 2024-01-15. |
| Resumo | |
Living (rose Bengal stained) benthic foraminiferal faunas, grain size, geochemical parameters (total organic matter, chlorophyll-a, pheophytin-a, molecular markers, and vertical flux of particulate organic matter) were investigated in 14 stations in two submarine canyons Almirante Camara and Grussai considered mature and immature, respectively, and on the adjacent continental slope, from 400 to 1300 m water depth, in the southwestern Atlantic Ocean. Samples were retrieved during two campaigns, in the austral winter 2008 and the austral summer 2009. The density, richness, and species composition of the benthic foraminiferal fauna decrease with depth in the canyons and along the adjacent slope transects, reflecting the availability and quality of sedimentary organic matter. Both canyons act as traps of labile organic matter, mainly towards the head of the Almirante Camara canyon, promoting high specimen density, species richness, and the occurrence of species indicative of pulses of phytodetritus (e.g., Bolivina pacifica, Nonionella opima, and Nonionella stella). Towards the deeper regions of Almirante Camara canyon and in the adjacent slope area, the lower abundance, diversity, and richness reflect more oligotrophic conditions and an adverse environment in terms of easily metabolizable organic matter. This multiproxy study demonstrates that the canyons in the southeastern Brazilian continental margin play an important role in accumulating organic matter. (AU) | |
| Processo FAPESP: | 17/00427-5 - Distribuição vertical dos foraminíferos bentônicos vivos dos mud-belts na margem continental sul brasileira: resposta à variação da condição redox e ao aporte de matéria orgânica |
| Beneficiário: | Cintia Yamashita |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 14/21488-4 - Foraminíferos bentônicos vivos ao longo de um gradiente batimétrico do talude aberto e cânions na Bacia de Campos, Oceano Atlântico Sudoeste |
| Beneficiário: | Silvia Helena de Mello e Sousa |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 13/12510-3 - Avaliação da produtividade oceânica no talude continental da Bacia de Campos, margem sudeste brasileira: uma visão a partir de foraminíferos bentônicos e isótopos estáveis |
| Beneficiário: | Silvia Helena de Mello e Sousa |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |