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Acoustic characterization of fish and macroplankton communities in the seychelles-chagos thermocline ridge of the southwest Indian ocean

Authors
Kang, MyoungheeOh, SunyoungOh, WooseokKang, Dong-JinNam, SungHyunLee, Kyounghoon
Issue Date
Feb-2024
Publisher
Elsevier Ltd
Keywords
Echosounder; Fish and macroplankton; Frame trawl net; Frequency response; Oceanographic features; Seychelles-Chagos thermocline ridge; Sound scattering layers; Southwest indian ocean
Citation
Deep-Sea Research Part II: Topical Studies in Oceanography, v.213
Indexed
SCIE
SCOPUS
Journal Title
Deep-Sea Research Part II: Topical Studies in Oceanography
Volume
213
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/69485
DOI
10.1016/j.dsr2.2023.105356
ISSN
0967-0645
1879-0100
Abstract
In this study, we describe the dynamics of the sound scattering layers (SSLs), particularly those of fish and macroplankton communities in the epipelagic layer, in the Seychelles-Chagos Thermocline Ridge (SCTR) of the southwest Indian Ocean using hydroacoustic data, net sampling, and oceanographic information. Overall, the acoustic backscattering values of the fish community were considerably higher than those of the macroplankton. Both communities were more densely distributed in the SCTR than in its surrounding region. On the vertical profile, the acoustic peak of the fish community was at 17 m during the day; however, considerably high values of up to 82 m were observed at night. Below 26 m, macroplankton was seldom found, regardless of the time. Hydrographic properties, such as temperature, salinity, dissolved oxygen (DO), and chlorophyll fluorescence, in the SCTR, were similar; however, an area at 5–8°S, 67°E was cooler, saltier, and had slightly lower DO. Weak or moderate positive correlations were observed between acoustic and hydrographic features. Based on all net samples, the most abundant taxon in terms of the total number of samples was found to be krill (Euphausiacea, 81%), followed by lantern fish (Myctophum punctatum, 12%). Understanding the dynamics of SSLs, particularly epipelagic organisms, will help to better clarify the important ecological roles of these organisms and their ability to facilitate vertical incorporation into marine food webs. © 2023
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해양과학대학 (해양경찰시스템학과)
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