Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Strong Downwelling (Upwelling) Impact on Small Pelagic Fish Production During the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java

Version 1 : Received: 1 November 2020 / Approved: 2 November 2020 / Online: 2 November 2020 (19:45:51 CET)

How to cite: Lumban-Gaol, J.; Siswanto, E.; Natih, N.M.N.; Nurjaya, I.W.; Hartanto, M.T.; Maulana, E.; Adrianto, L.; Mahapatra, K.; Rachman, H.A.; Osawa, T.; Permana, A. The Strong Downwelling (Upwelling) Impact on Small Pelagic Fish Production During the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java. Preprints 2020, 2020110071 (doi: 10.20944/preprints202011.0071.v1). Lumban-Gaol, J.; Siswanto, E.; Natih, N.M.N.; Nurjaya, I.W.; Hartanto, M.T.; Maulana, E.; Adrianto, L.; Mahapatra, K.; Rachman, H.A.; Osawa, T.; Permana, A. The Strong Downwelling (Upwelling) Impact on Small Pelagic Fish Production During the 2016 (2019) Negative (Positive) Indian Ocean Dipole Events in the Eastern Indian Ocean off Java. Preprints 2020, 2020110071 (doi: 10.20944/preprints202011.0071.v1).

Abstract

Although researchers have investigated widely the impact of IOD phases on human lives, only a few have examined such impacts on fisheries. In this study, we analyzed the influence of negative (positive) of IOD on a chlorophyll a (Chl-a) concentration as an indicator of phytoplankton biomass and small pelagic fish production in the eastern Indian Ocean (EIO) off Java. We also conducted field surveys in the EIO off Palabuhanratu Bay at the peak (October) and the end (December) of the 2019 positive IOD phase. Our findings show that the Chl-a concentration had a strong and robust association with the 2016 (2019) negative (positive) IOD phases. The negative (positive) anomalous Chl-a concentration in the EIO off Java associated with the negative (positive) IOD phase induced strong downwelling (upwelling), leading to the preponderant decrease (increasing) of small pelagic fish production in the EIO off Java.

Subject Areas

chlorophyll-a; downwelling; IOD; small pelagic fish; upwelling

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