Spatial and Temporal Distribution of Krill Euphausia superba Biomass in the Ross Sea (1989–1990 and 1994)
Spatial and Temporal Distribution of Krill Euphausia superba Biomass in the Ross Sea (1989–1990 and 1994)
复制标题
罗斯海磷虾磷虾生物量的时空分布（1989-1990和1994年）
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
J. Kalinowski
中科院分区：
文献类型：
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作者：
M. Azzali;J. Kalinowski
本章的目的是提高知识的磷虾种群在罗斯海，一个地区，在过去很少受到关注，并已被认为是磷虾缺乏。1989- 1990年初夏，在无冰沃茨和准静止环境条件下进行了两次调查。1994年春末，在完全或部分冰层覆盖的条件下又进行了两次调查。在声学调查的同时，对鸟类和哺乳动物进行了普查。本章介绍所用仪器以及数据采集和数据处理方法。结果表明，与普遍的想法相反，罗斯海并不缺乏磷虾。在罗斯海南部，纬度高达76°S的地区发现了非常密集的南极磷虾，这是文献中没有磷虾的地区。在这些区域，发现了磷虾消费者（小须鲸、海狮和阿德利企鹅）的密度峰值。1989- 1990年和1994年估计的superba分别与印度和大西洋部分的估计数量级相同。根据这些结果，作者认为，文献中所提出的南极洲周围磷虾的大规模分布，应该由从南纬76°向北延伸的罗斯海部分来补充。
This chapter aims to improve the knowledge of krill populations in the Ross Sea, an area that has received little attention in the past and which has been thought to be krill-deficient. In the early summer 1989–90, two surveys were conducted in ice-free waters with quasistationary environmental conditions. In the late spring 1994, two more surveys were conducted under conditions of complete to partial ice cover. Concurrent with the acoustic surveys, censuses were taken of the birds and mammals. This chapter gives a description of the instruments used and of data-acquisition and data-processing methods. The results indicate that, contrary to prevalent thinking, the Ross Sea is not krill-deficient. Very dense concentrations of Euphausia superba were found in the southern part of the Ross Sea, up to 76°S in latitude, an area presented in the literature as krill-absent. In these areas, density peaks of krill consumers (minke whales, crabeater seals and Adelie penguins) were found. The mean density of E. superba estimated in 1989–90 and 1994 is of the same order of magnitude as that estimated in the Indian and Atlantic sectors, respectively. On the basis of these results, the authors suggest that the large-scale distribution of krill around Antarctica, presented in the literature, should be supplemented by the part of the Ross Sea extending to the north from the latitude of 76°S.