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首页> 外文期刊>Journal of plankton research >Quantification of the abundance and distribution of the common jellyfish Aurelia aurita s.l. with a Dual-frequency IDentification SONar (DIDSON)
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Quantification of the abundance and distribution of the common jellyfish Aurelia aurita s.l. with a Dual-frequency IDentification SONar (DIDSON)

机译：量化普通水母Aurelia aurita s.l.的丰度和分布。与双频识别声纳（DIDSON）

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摘要

A Dual-frequency IDentification SONar (DIDSON) provided a powerful tool to determine the numerical abundance and spatial distribution of medusae of the common jellyfish Aurelia aurita s.l. in shallow coastal waters. The sonar image obtained in high frequency (1.8 MHz) mode enabled us to identify and count individual medusae of 4.1-19.6 cm (mean: 13.1 cm) bell diameter. Deployment of the DIDSON along three similar to 4-km-long transects in a shallow brackish-water lake (average depth: 5.1 m) revealed that A. aurita aggregated (e.g. > 8.0 medusae m(-3)) near the lake center. The medusae occurred throughout the water column, but tended to avoid low salinity surface and deoxygenated bottom layers. The overall average density of medusae estimated by the DIDSON was 3.3 times higher than that estimated by net sampling. Use of a DIDSON can facilitate quantitative determination of jellyfish populations that cause problem blooms worldwide in order to better understand their ecological importance.
机译：双频识别声纳（DIDSON）提供了一个强大的工具，可以确定普通水母Aurelia aurita s.l的水母的数量和空间分布。在沿海浅水区。在高频（1.8 MHz）模式下获得的声纳图像使我们能够识别和计数4.1-19.6 cm（平均：13.1 cm）钟形直径的单个水母。 DIDSON在浅咸水湖（平均深度：5.1 m）中沿着三个类似于4 km长的样带展开，表明金黄色芽孢杆菌在湖中心附近聚集（例如> 8.0 medusae m（-3））。水母遍布水柱，但倾向于避免低盐度表面和底层脱氧。 DIDSON估计的美杜鹃的总体平均密度是净抽样估计的3.3倍。 DIDSON的使用可以帮助定量确定导致全球范围内出现问题的水母种群，以便更好地了解其生态重要性。

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