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首页> 外文期刊>Marine ecology progress series >Biodiversity of benthic assemblages on the Arctic continental shelf: historical data from Canada
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Biodiversity of benthic assemblages on the Arctic continental shelf: historical data from Canada

机译：北极大陆架底栖生物的生物多样性：来自加拿大的历史数据

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This study describes patterns of abundance, diversity, and assemblages of benthic macrofauna within the Canadian Arctic Archipelago. A review of data reports and the published literature yielded 219 stations and 947 taxa from 7 sources in various regions of the Canadian Arctic Archipelago (i.e. Beaufort Sea and Mackenzie Shelf, Victoria Island, Hudson and James Bays, Frobisher Bay, Ungava Bay, and Southern Davis Strait). In general, we observed that eastern regions of the Canadian Arctic Archipelago showed greater values of species richness (or α diversity) than the western and central regions, whereas no specific patterns were observed for Shannon-Wiener's diversity (H′) and Pielou's evenness (J′) indices. The Beaufort Sea and Mackenzie Shelf region exhibited high values of taxonomic distinctness (Δ~+), whereas Hudson Bay showed low values. However, the Hudson Bay region showed high values of turnover (β_W) diversity. A non-metric multi-dimensional scaling plot of similarity (Bray-Curtis index) and analysis of similarity revealed that species composition differed among regions, even those located in close proximity to one another. These investigations were conducted at different levels of taxonomic resolution (Species, Order, Class and Phyla) and the results demonstrated that most patterns were maintained up to the Order and Class level. A relatively small number of taxa, mainly annelids, were responsible for most of the dissimilarity among regions. Bottom salinity and temperature were the most important environmental variables (among depth of site, bottom temperature, salinity, physical and chemical sediment characteristics) for determining these assemblage patterns. Multiple regression analyses also demonstrated that variance in species richness and diversity (H′) was best explained by variance in salinity (55 and 43 % respectively). The analysis of a time series from Frobisher Bay revealed that the temporal (mo/yr-scale) variability of assemblages was of the same order as the spatial (km-scale) variability among sites.
机译：这项研究描述了加拿大北极群岛内底栖大型动物的数量，多样性和组合模式。回顾数据报告和已发表的文献，从加拿大北极群岛各个地区的7个来源（即Beaufort Sea and Mackenzie Shelf，Victoria Island，Hudson and James Bays，Frobisher Bay，Ungava Bay和Southern）的7个来源获得219个站和947个分类单元戴维斯海峡）。一般而言，我们观察到加拿大北极群岛的东部地区的物种丰富度（或α多样性）值比西部和中部地区大，而对于Shannon-Wiener的多样性（H'）和Pielou的均匀度（ J'）索引。 Beaufort Sea和Mackenzie Shelf地区显示出较高的分类学差异值（Δ〜+），而Hudson Bay显示出较低的分类值。但是，哈德逊湾地区的营业额（β_W）多样性很高。一项非相似的相似度（Bray-Curtis指数）的多维度量标度图和相似度分析显示，物种组成在不同地区之间也存在差异，即使是彼此紧邻的物种也是如此。这些调查是在不同的生物分类分辨率级别（物种，顺序，类别和植物）上进行的，结果表明大多数模式都保持在顺序和类别的水平上。相对较少的分类单元（主要是类目动物）是造成区域间差异最大的原因。底部盐度和温度是确定这些组合模式的最重要的环境变量（位置深度，底部温度，盐度，物理和化学沉积物特征之间）。多元回归分析还表明，最好用盐度差异来解释物种丰富度和多样性（H'）的差异（分别为55％和43％）。对Frobisher湾的时间序列进行的分析表明，集合的时间（mo / yr尺度）变异与站点之间的空间（km尺度）变异具有相同的数量级。

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