由于声纳频率选择,海底生物质生物质分布存在很大差异
Lloyd Izard1, Alejandro Ariza2, Nadège Fonvieille3
1Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d'Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL), Paris, France.
Proceedings. Biological sciences
|May 27, 2025
概括
声纳频率会影响海动物生物质估计. 使用较低频率 (18 kHz) 更好地捕获极地地区的生物质,与标准的38 kHz声纳不同,由于鱼的游泳膀大小变化.
科学领域:
- 海洋生态海洋生态学
- 声学海洋学是一门学科.
- 渔业科学 渔业科学
背景情况:
- 全球海动物分布研究经常使用38kHz声纳,用水柱反向散射作为生物质代理.
- 声纳反射和净采样生物质之间存在差异,特别是在温带-极地过渡区.
- 这些不匹配与鱼动物共振的变化有关,受声纳频率和游泳膀大小的影响.
研究的目的:
- 调查不同声纳频率 (38 kHz与18 kHz) 如何影响跨度的海生态系统的感知.
- 为了分析声纳频率,鱼的游泳膀大小和印度洋南极洲前线地区的声学反射之间的关系.
主要方法:
- 对38kHz和18kHz的声纳观测结果的分析.
- 检查鱼类游泳膀大小分布.
- 对不同度和频率的声学反射散射模式进行比较.
主要成果:
- 从38 kHz到18 kHz的声信号优势的转移被观察到极地地区.
- 在南极前线的反向散射差异在38kHz时是18kHz时的四倍.
- 亚南极鱼种群中游泳膀体积增加可能解释了观察到的依赖频率的声响.
结论:
- 声纳频率的选择大大改变了对海底动物分布和生物质的评估.
- 横跨度的游泳膀共振变异性对于准确解释声学数据至关重要.
- 未来的大规模声纳调查需要考虑频率依赖的影响,以可靠地绘制海生态系统的地图.
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