Community structure and species diversity of Harpacticoida (Crustacea: Copepoda) at two sites in the deep sea of the Angola Basin (Southeast Atlantic)
Community structure and species diversity of Harpacticoida (Crustacea: Copepoda) at two sites in the deep sea of the Angola Basin (Southeast Atlantic)
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DOI：
10.1007/s13127-013-0154-2
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发表时间：
2014-03-01
影响因子：
1.6
通讯作者：
Schminke, Horst Kurt
中科院分区：
文献类型：
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作者：
George, Kai Horst;Veit-Koehler, Gritta;Schminke, Horst Kurt
这项研究的目的是评估在两个相距很远的深海位置上的触须类(甲壳纲，桡足纲)组合的成分差异。在DIVA 1号房车流星巡航(2000年7月/8月)前往安哥拉盆地(东南大西洋)期间，多芯公司(MUC)对相距约300海里的两个深海站(325站和346站)进行了反复采样。为了进行定量分析，从两个站点的15个部署中的每个部署中随机抽取了5个MUC样本，总计75个核心。在整个研究过程中，遇到了7,081个有鳍目动物标本，其中31.4%是成虫，可以进行物种水平的分析：鉴定出682种，其中99.3%是科学上新发现的。在北站346号，总共记录到600种，是有史以来单一深海地点记录到的最高的触角类物种数量。大多数物种(56%)以单体动物为代表。多变量检验发现，两个站点的群落组成存在显著差异。346站的物种多样性、物种丰富度和物种密度较高，而各站之间的分类学区分度、均匀度和稀疏度相似。回归和相关分析表明，物种多样性的差异最好的解释是物种密度，而不是物种丰富度。由于密度低，采样不足是南站325的一个问题。然而，我们的研究表明，在一个通常被认为是统一和稳定的栖息地的单一深海盆地内，区域尺度的触角类群落结构存在显著差异。这些观察到的差异被认为反映了这两个站点在食物供应方面的差异。
The aim of this study was to evaluate compositional differences between harpacticoid (Crustacea, Copepoda) assemblages at two widely separated abyssal locations. During the DIVA 1 cruise of RV METEOR (July/August 2000) to the Angola Basin (Southeast Atlantic), two deep-sea stations, approximately 300 nautical miles apart (Stations 325 and 346), were sampled repeatedly by Multicorer (MUC). For quantitative analyses, 5 MUC samples were selected at random from each of 15 deployments at both stations, totalling 75 cores. Across the study, 7,081 Harpacticoida specimens were encountered and of these 31.4 % were adults and could be analysed to species level: 682 species were identified, with 99.3 % new to science. At northern Station 346, a total of 600 species were recorded-the highest harpacticoid species number ever recorded for a single deep-sea locality. Most species (56 %) were represented by singletons. Multivariate tests identified significant differences between community compositions at the two stations. Diversity, species richness and species density were higher at Station 346, whilst taxonomic distinctness, evenness, and rarefaction were similar between stations. Regression and correlation analyses showed that the difference in species diversity was best explained by species densities rather than species richness. Under-sampling due to low densities was an issue at the southern Station 325. Nevertheless, our study demonstrated significant differences in regional-scale harpacticoid community structures within a single deep-sea basin that would usually be considered a uniform and stable habitat. These observed differences are thought to reflect differences in food availability at the two stations.