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Benthic boundary layer macrofauna from the upper slope of the Chatham Rise (SW Pacific)

机译：Chatham Rise（SW Pacific）上坡的底栖边界层大型动物群

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摘要

Benthic boundary layer (BBL) communities are a taxonomically and functionally diverse but poorly known component of deep-sea environments. We investigated macrofaunal assemblages across the upper slope of the Chatham Rise (CR) in the south-western Pacific in relation to location, depth and sediment variables. Using data from the TAN1116 voyage to the CR in austral spring 2011, we assessed variation in abundance, faunal composition and diversity of three BBL compartments: fully suprabenthic taxa, taxa with suprabenthic affinities and fully epibenthic taxa across taxonomic levels (phylum, class, order, family, genus and species). In total, eight samples were taken using an epibenthic sledge across three areas on the CR (Mernoo Gap, CR North and CR South) and at two depth ranges (400-600 and 900-1,000 m) distributed along a north to south as well as east to west axis, crossing different productivity gradients. In contrast to previous studies from the CR, there was no significant correlation between macrofaunal densities and sediment variables or depth. Species diversity of isopods and tanaidaceans was average to high, compared to other geographic regions, but did not show any significant pattern with location or depth. Most species in these two groups (similar to 82%) were new to science, probably reflecting the paucity of sampling and taxonomic study of these faunal components in New Zealand waters. Our results suggest employing finer-scale investigations across a range of temporal and spatial scales and at finer taxonomic resolution would greatly further our knowledge and understanding of patterns and processes shaping deep-sea BBL community structure.
机译：底栖边界层（BBL）群落在分类学和功能上是多种多样的，但在深海环境中却鲜为人知。我们调查了西南太平洋Chatham Rise（CR）上坡上的大型动物群落，涉及位置，深度和沉积物变量。我们使用TAN1116航行至2011年春季南北CR的数据，评估了三个BBL舱室的丰度，动物组成和多样性的变化：整个上层分类群，具有上层亲和力的分类群和不同分类级别（门，阶，阶的完全表皮分类群） ，家族，属和种）。总共，使用表皮爬犁在CR的三个区域（Mernoo Gap，CR North和CR South）以及沿南北分布的两个深度范围（400-600和900-1,000 m）中采集了八个样本作为东西轴，跨越不同的生产率梯度。与CR的先前研究相比，大型动物的密度与沉积物变量或深度之间没有显着相关性。与其他地理区域相比，等足类动物和科动物的物种多样性平均偏高，但没有显示出任何明显的位置或深度格局。这两组中的大多数物种（约占82％）是科学新手，这可能反映了新西兰水域中这些动物组成部分的采样和分类研究不足。我们的结果表明，在更广泛的时空范围内进行更大规模的研究，并且以更精细的分类学分辨率，将极大地增进我们对形成深海BBL群落结构的模式和过程的了解和理解。

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