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

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY Deep-sea Research Part Ii-topical Studies in Oceanography Pub Date : 2024-01-01 DOI:10.1016/j.dsr2.2023.105356
Myounghee Kang , Sunyoung Oh , Wooseok Oh , Dong-Jin Kang , SungHyun Nam , Kyounghoon Lee
{"title":"Acoustic characterization of fish and macroplankton communities in the seychelles-chagos thermocline ridge of the southwest Indian ocean","authors":"Myounghee Kang ,&nbsp;Sunyoung Oh ,&nbsp;Wooseok Oh ,&nbsp;Dong-Jin Kang ,&nbsp;SungHyun Nam ,&nbsp;Kyounghoon Lee","doi":"10.1016/j.dsr2.2023.105356","DOIUrl":null,"url":null,"abstract":"<div><p>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 (<em>Euphausiacea</em>, 81%), followed by lantern fish (<em>Myctophum punctatum</em>, 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.</p></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"213 ","pages":"Article 105356"},"PeriodicalIF":2.3000,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0967064523001066/pdfft?md5=d961a1d4648ad011bd5cba3a7384fe79&pid=1-s2.0-S0967064523001066-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Deep-sea Research Part Ii-topical Studies in Oceanography","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0967064523001066","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OCEANOGRAPHY","Score":null,"Total":0}
引用次数: 0

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.

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
西南印度洋塞舌尔-查戈斯温跃层海脊鱼类和大型浮游生物群落的声学特征描述
在这项研究中,我们利用水声数据、网状取样和海洋学信息,描述了西南印度洋塞舌尔-查戈斯温跃层海脊(SCTR)声散射层(SSL)的动态,特别是表层鱼类和大型浮游生物群落的动态。总体而言,鱼类群落的声学反向散射值大大高于大型浮游生物。与周边地区相比,这两个群落在 SCTR 的分布更为密集。在垂直剖面上,鱼类群落的声学峰值白天在 17 米处,但夜间观测到的峰值也相当高,可达 82 米。在 26 米以下,无论何时都很少发现大型浮游生物。南极海洋生物资源保护区的水文特征,如温度、盐度、溶解氧和叶绿素荧光,都很相似;但是,位于南纬 5-8 度、东经 67 度的区域温度较低、盐度较高,溶解氧略低。声学特征与水文特征之间存在微弱或中等程度的正相关。根据所有网具样本,发现在样本总数中最丰富的分类群是磷虾(大戟科,81%),其次是灯笼鱼(刺灯鱼,12%)。了解 SSL(尤其是表层生物)的动态将有助于更好地阐明这些生物的重要生态作用及其促进垂直融入海洋食物网的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
CiteScore
6.40
自引率
16.70%
发文量
115
审稿时长
3 months
期刊介绍: Deep-Sea Research Part II: Topical Studies in Oceanography publishes topical issues from the many international and interdisciplinary projects which are undertaken in oceanography. Besides these special issues from projects, the journal publishes collections of papers presented at conferences. The special issues regularly have electronic annexes of non-text material (numerical data, images, images, video, etc.) which are published with the special issues in ScienceDirect. Deep-Sea Research Part II was split off as a separate journal devoted to topical issues in 1993. Its companion journal Deep-Sea Research Part I: Oceanographic Research Papers, publishes the regular research papers in this area.
期刊最新文献
Unveiling marine heatwave dynamics in the Persian /Arabian Gulf and the Gulf of Oman: A spatio-temporal analysis and future projections Ecophenotypic variation in a cosmopolitan reef-building coral suggests reduced deep-sea reef growth under ocean change Siliceous microfossil assemblages in the southern Emperor Seamount Chain sediments and their biogeographical and paleoceanographical implications The first Mud Dragons (Kinorhyncha) from the Emperor Seamount Chain (Northwestern Pacific) with notes on their biogeography and distribution patterns in the Pacific Deep-Sea Latitudinal variation in zooplankton over the Emperor Seamounts (34°–44° N, 170°–171° E) during the summer of 2019
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1