文章摘要
基于声学数据的2018年夏季南奥克尼群岛南极磷虾集群特征研究
Using acoustic data to reveal aggregation characteristics of Antarctic krill (Euphausia superba) in the South Orkney Islands during summer 2018
投稿时间:2019-07-12  修订日期:2019-09-28
DOI:
中文关键词: 南极磷虾  集群  声学  南奥克尼群岛
英文关键词: Euphausia superba  aggregation  acoustic  South Orkney Islands
基金项目:国家重点研发计划项目(2018YFC1406801);国家自然(41776185)
作者单位E-mail
万树杰 上海海洋大学 17621698948@163.com 
杨洋 上海海洋大学  
刘慧 上海海洋大学  
朱国平 上海海洋大学 gpzhu@shou.edu.cn 
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中文摘要:
      集群是南极磷虾最为突出的行为特征,其中集群特征值分布与划分等问题也是南极磷虾行为学研究中的热点。基于2018年夏季南奥克尼群岛南极磷虾资源声学调查数据,本研究对该海域南极磷虾集群进行了分析。结果显示,(1)检测到磷虾集群3224个,反应集群特征的5个参数—深度,长度,厚度,面积及密度分别为96.00±64.33m,218.52±455.66m, 11.19±13.98m,1894.40±9345.72m2和114.11±159.60 ind/m3。(2)不同时间段之间集群密度无显著性差异,但集群深度,长度,厚度及面积之间均存在显著性差异。不同水层间集群厚度和面积之间无显著性差异,但集群深度,长度和密度均存在显著性差异。(3)磷虾集群共分为三类,其中第Ⅰ类集群密度最大(325.90±221.30m),集群规模最小(379.64±433.73m2),深度最深(158.06±67.54m);第Ⅱ类集群的长度最大(1089.60±1189.56m),集群面积(15601.25±30243.33m2)远大于其它集群;第Ⅲ类集群深度最浅(78.91±52.88m),密度最小(48.87±50.33 ind/m3),但数量最多。
英文摘要:
      Aggregation is a typical behavior of Antarctic krill (Euphausia superba, thereafter krill). The distribution and type of aggregation is also the focus of krill behavior study. Based on acoustic data collected by Antarctic krill resource survey, the aggregation of krill around the South Orkney Islands from January to February 2018 was investigated using the Simrad EK60 (38 and 120 kHz) echosounder. The results indicated (1) a total of 3224 krill aggregations were detected, and the depth, length, thickness, area and density of krill aggregation were (218.52±455.66m), (11.19±13.98m), (1894.40±9345.72m2), (96.00±64.33m) and (114.11±159.60 ind/m3), respectively. (2) in different periods of a day, significant differences were found between depth, length, thickness and area of krill aggregations, but density of krill aggregation hadn’t significant different. In different depths of krill aggregation, there were significant differences between depth, length, area of krill aggregation, but no significant differences were found between thickness and area of krill aggregation, respectively. (3) three distinct types of krill aggregation were classified. Type I had the highest density (325.90±221.30m), smallest area (379.64±433.73m2) and deepest depth (158.06±67.54m); type II had the longest length (1089.60±1189.56m) and the area (15601.25±30243.33m2) were much larger than other two types; type Ⅲ had the lowest depth (78.91±52.88m) and smallest density (48.87±50.33 ind/m3), but it had the highest number of krill in the aggregation.
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