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. 2022 Sep;37(9):1436-1445.
doi: 10.1002/bio.4315. Epub 2022 Jun 28.

Bioluminescence of the tropical Indian Ocean: a multiple-scale variation

Sergey A Piontkovski  1 , Alexandr V Melnik  2 , Irina M Serikova  2 , Vladislav P Evstigneev  1 , Sergey Dobretsov  3
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Bioluminescence of the tropical Indian Ocean: a multiple-scale variation

Sergey A Piontkovski et al. Luminescence. 2022 Sep.

Abstract

Large-scale surveys represented by 5800 bathymetric casts in the western Indian Ocean (0-22o N, 54-58o E), elucidated the 10-fold variation of the bioluminescent potential (BP) in the upper mixed layer, during the winter (north-east) monsoon season. The mesoscale survey in February 2017 consisted of 26 drift stations (4o N-3o S, 65-68o E) on which 5-10 bathymetric casts were deployed down to 60 m. The maximal BP was associated with the periphery of a cyclonic eddy. The two-fold to three-fold variation of BP characterized the spatial heterogeneity modulated by a detected eddy. High-frequency casts on drift stations resembled the fine-scale heterogeneity in which the three-fold variation was observed within the BP maximum at a 37 ± 13 m depth. The latter one was located above the deep chlorophyll maximum at a 80 m depth. A general decline of the BP variance from the large scale through mesoscale to fine scale, fits that of the zooplankton biomass.

Keywords: Indian Ocean; bioluminescence; chlorophyll a; mesoscale eddies; zooplankton.

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