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本文所报告的是在烟、威海区鮐魚漁汛期所进行的两次定点周日调查的结果。分析的种类主要的是鮐魚的食物,包括细长脚(虫戍)(Themisto gracilipes Norman)强壮箭虫(Sagitta crassa Tokioka)太平洋哲镖溞(Calanus pacificas Brodsky)和十足目幼虫(Decopod larva)等。 从分析得到以下初步结果: 一、所调查的浮游动物的垂直分布表现有明显的周日变化,说明它们都有周日垂直移动。 二、上述浮游动物表现有午夜下沉和黎明上升现象,其中以太平洋哲镖水蚤和强壮箭虫表现得较明显。 三、参攷着本海区在调查期间的温度垂直分布情况来看,这些动物的垂直移动在温跃层处受到水文情况变化的影响。 四、在分析的资料中还发现一些其他浮游动物如腹针剌镖水蚤有周日垂直移动现象,一些底部生活的动物如钩虾亚目端足类,细螯虾(Leptochela gracilis Stimpson)和多毛类环节动物等在夜间进入水层中,最高分布到5M(钩虾亚目和多毛类)或OM水层(细螯虾)。这些动物在鮐魚胃含物中也有出现。 本文讨论了所调查的动物的昼夜垂直分布和鮐魚摄食情况的关系。 本文还计算了各类浮游动物的垂直移动幅度D(分布中心的移动)和垂直移动中的活动量A(D×生物量,本文所用为相对数值)。并用它们来比较各种动物的垂直移动强度,以及这些动物在全部浮
Abstract：The animals studied were important food organisms of Pneumato-phorus iaponicus ( Houttuyn ) off Cheefoo and Weihai , including Them-isto gracilioes Norman. Sagritta crassa Tokioka. Calanus pacificus Bro-dsky etc. It was found that., in general, the animals gathered in the deeper water at midday, moved upward in the afternoon. "Midnight sinking" and "dawn rise" were evident, especially in C. pacificus and S. crassa. Some bottom forms also appeared in the water column at nignt. The time of occurrence of all the food organisms in the upper water layer matched very well to that in the stomach contents of p-iaponicus collected at different times of a day. This fact suggested the significance of diurnal vertical migrations in the food supplies of the fish and the adaptive value to the survival of the food organisms.
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基本信息:
DOI：10.16441/j.cnki.hdxb.1964.01.007
引用信息:
[1]李冠国,黄世玫.烟、威海区鲐鱼渔场中浮游动物的昼夜垂直分布[J].山东海洋学院学报,1964(01):106-127.DOI:10.16441/j.cnki.hdxb.1964.01.007.
1964-04-01
1964-04-01