Pubblicazione scientifica

Do the Brazilian sardine commercial landings respond to local ocean circulation?

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità
produzione e cattura

RIASSUNTO

It has been reported that sea surface temperature (SST) anomalies, flow intensity and mesoscale ocean processes, all affect sardine production, both in eastern and western boundary current systems. Here we tested the hypothesis whether extreme high and low commercial landings of the Brazilian sardine fisheries in the South Brazil Bight (SBB) are sensitive to different oceanic conditions. An ocean model (ROMS) and an individual based model (Ichthyop) were used to assess the relationship between oceanic conditions during the spawning season and commercial landings of the Brazilian sardine one year later. Model output was compared with remote sensing and analysis data showing good consistency. Simulations indicate that mortality of eggs and larvae by low temperature prior to maximum and minimum landings are significantly higher than mortality caused by offshore advection. However, when periods of maximum and minimum sardine landings are compared with respect to these causes of mortality no significant differences were detected. Results indicate that mortality caused by prevailing oceanic conditions at early life stages alone can not be invoked to explain the observed extreme commercial landings of the Brazilian sardine. Likely influencing factors include starvation and predation interacting with the strategy of spawning “at the right place and at the right time”.

DATA

Data di pubblicazione: 10/05/2017

AUTORI

GOUVEIA MAINARA B
GHERARDI DOUGLAS F M
LENTINI CARLOS A D
DIAS DANIELA F
CAMPOS PAULA C

ENTE DI AFFERENZA

Instituto de Física – Departamento de Física da Terra e do Meio Ambiente Universidade Federal da Bahia - UFBA Salvador Bahia Brazil
NATL INST SPACE RSCH INPE REMOTE SENSING DIVISION SAO JOSE DOS CAMPOS SAO PAULO BRAZIL
GOAT GRUPO DE OCEANOGRAFIA TROPICAL UNIV FEDERAL DA BAHIA UFBA SALVADOR BAHIA BRAZIL
FISHERIES & OCEANS CANADA CANADA

RIVISTA

PLoS ONE, 12(5), e0176808

IMPACT FACTOR

2,870

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