Carbon Flow for Plankton Metabolism of Saco do Mamangua Ria, Bay of Ilha Grande, a Subtropical Coastal Environment in the South Brazil Bight

Autor(es)

Brandini, Frederico ^[1] ; Michelazzo, Luan Sayeg ^[1] ; Freitas, Gabriel Ruske ^[1] ; Campos, Giulia ^[1] ; Chuqui, Mateus ^[1] ; Jovane, Luigi ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Oceanog Inst, Dept Biol Oceanog, Lab Marine Biogeochem, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Oceanog Inst, Lab Paleomagnetism, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN MARINE SCIENCE; v. 6, SEP 18 2019.
• Citações Web of Science: 0

Resumo

The autotrophic plankton assemblage along the subtropical coastal embayments of the South Brazil Bight is dominated by the cyanobacterium Synechococcus. This investigation aims to assess its contribution to the total carbon metabolism within the planktonic system of Mamangua Ria, a sub-system of the Bay of Ilha Grande, southeast Brazilian coast. We hypothesized that photosynthetic carbon fixation by cyanobacteria does not support the plankton metabolism inside the Ria. Net community production (NCP) was calculated from differences between gross community production (GCP)and dark community respiration rates measured by in situ incubations using the oxygen light-and-dark technique. Our results reveal the carbon budget inside the Ria is not balanced by autotrophic production. The deficit of net ecosystem production throughout the year ranged from 0.5 to 1.5 mg m(-2) d(-1) below what is necessary to sustain local plankton metabolism. We argue that the offset between daily GCP and total community respiration may be balanced by grazing of nano-heterotrophs on heterotrophic bacteria. Our conclusions apply to the majority of the meso-oligotrophic Brazilian inner shelf waters away from estuarine plumes and upwelling systems. (AU)

• Processo FAPESP: 18/17061-6 - Relação entre ambiente e bactérias magnetotáticas
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 11/22018-3 - Avaliação da produtividade primária marinha através do estudo das bactérias magnetotáticas em sedimentos
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores