德雷克海峡纬向锋表层中浮游动物组成格局

IF 2 3区 环境科学与生态学 Q2 MARINE & FRESHWATER BIOLOGY
Octavio Esquivel-Garrote, Erik Muxagata
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引用次数: 0

摘要

摘要浮游动物是海洋高营养层的主要食物来源。在南大洋,浮游动物的分布与南极环极流锋面的物理梯度有关。我们的目标是确定在德雷克海峡中与ACC锋面有关的浮游动物的分布。利用浮游生物连续记录仪在两个样带采集样本。中浮游动物与环境变量有关。2017年亚南极锋区和2016年南极区中浮游动物丰度较高。2016年共鉴定出81个分类群,23种,2017年鉴定出31种。桡足类数量最多(89%),腕足类(Centropages brachiatus)(3 872个)和Oithona spp(2 916个)数量最多。中浮游动物丰度和组成受锋变率的影响。分类群在2016年向北收缩,并在2017年向南迁移,这与南美洲沿海大陆架记录的叶绿素a (Chl a)值有关。靠近南极半岛的Chl a值与中浮游动物丰度无关。某些分类群的丰度变化可能反映不同的气候事件。这些变化可能会影响更高营养等级的猎物的可获得性,要么是通过流离失所获取食物,要么是通过食物的可获得性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Composition patterns of surface mesozooplankton in the zonal fronts of Drake Passage
Abstract Zooplankton is the main food source for higher trophic levels in marine environments. In the Southern Ocean, the distribution of zooplankton is related to the physical gradient of the Antarctic Circumpolar Current (ACC) fronts. Our objective was to determinate the distribution of mesozooplankton in relation to the ACC fronts in the Drake Passage. Samples were collected with the Continuous Plankton Recorder in two transects. Mesozooplankton was associated with environmental variables. High mesozooplankton abundances were recorded in the Subantarctic Front in 2017 and in the Antarctic Zone in 2016. A total of 81 taxa and 23 species in 2016 and 31 in 2017 were identified. Copepoda was the most abundant group (89%), and Centropages brachiatus (3 872 ind. m−3) and Oithona spp. (2 916 ind. m−3) were the most abundant copepod taxa. Mesozooplankton abundance and composition were influenced by front variability. Taxa were contracted northward on 2016 and displaced southward in 2017 and linked to chlorophyll a (Chl a) values recorded in the coastal shelf of South America. Chl a values registered close to Antarctic Peninsula were not linked to mesozooplankton abundance. Changes in abundances of certain taxa may reflect distinct climate events. These changes may impact the availability of prey for higher trophic levels, either through displacement for food or food availability.
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来源期刊
Journal of Plankton Research
Journal of Plankton Research 生物-海洋学
CiteScore
3.50
自引率
9.50%
发文量
65
审稿时长
1 months
期刊介绍: Journal of Plankton Research publishes innovative papers that significantly advance the field of plankton research, and in particular, our understanding of plankton dynamics.
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