Acoustic characteristics of Jesogammarus annandalei in Lake Biwa

IF 2.9 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research Pub Date : 2025-01-25 DOI:10.1016/j.seares.2025.102566

Naizheng Yan , Tohru Mukai , Kouichi Sawada , Kohei Hashimoto , Kanako Ishikawa

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引用次数: 0

Abstract

Mass mortality of Jesogammarus annandalei, an amphipod species endemic in Lake Biwa, has been recently observed. J. annandalei is useful in fisheries; therefore, analyzing its occurrence is important for conserving the species and maintaining biodiversity. The acoustic method can be used in monitoring the distribution and abundance of J. annandalei. Therefore, along with measuring total body length (TL), we measured the acoustic factor target strength (TS), density contrast g, and sound speed contrast h necessary for the application of the theoretical model (distorted-wave Born approximation model) of J. annandalei. The results indicated g = 1.0725 and h = 1.003, and the measured TS values agreed well with the estimated ones. The relationships between the average TS and TL at 38, 120, and 200 kHz were TS = 60.4logTL − 165.6; TS = 53.4logTL − 141.4; and TS = 46.5logTL − 129.0, respectively. Overall, this study advances our understanding of the acoustic properties of J. annandalei, potentially aiding in future acoustic monitoring, particularly for identifying the cause of similar mass mortality events.

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琵琶湖黑鲈的声学特征

琵琶湖特有的片足类动物jeogammarus annandalei最近被观察到大量死亡。J. annandalei在渔业中有用；因此，分析其发生情况对保护物种和维持生物多样性具有重要意义。声学方法可用于监测红枣的分布和丰度。因此，在测量总体长（TL）的同时，我们还测量了应用J. annandalei理论模型（畸变波Born近似模型）所需的声因子靶强度（TS）、密度对比g和声速对比h。结果表明g = 1.0725, h = 1.003， TS的实测值与预测值吻合较好。38、120、200 kHz时平均TS与TL的关系为TS = 60.4logTL−165.6；TS = 53.4logTL−141.4；TS = 46.5logTL−129.0。总的来说，这项研究促进了我们对南南达雷的声学特性的理解，可能有助于未来的声学监测，特别是确定类似的大规模死亡事件的原因。

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来源期刊

Journal of Sea Research 地学-海洋学

CiteScore

3.20

自引率

5.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.