HLY-05-02 Macrofauna Data [Bluhm]

This dataset contains soft bottom metazoan infauna (larger than 250 micrometer) that was collected with 33 box cores at 11 stations ranging from 817 m to 3961 m water depth in the high Arctic Canada Basin from 28 June to 25 July 2005. Total infauna abundance ranged from 0.6 to 50 individuals per 0.06 square meter (89-2722 individuals per square meter) and total biomass ranged from 0.2-1.6 g wet weight per 0.06 square meter (less than 0.1-26.1 g wet weight per square meter). Infauna taxon number per station was between 8 and 55. Abundance, biomass, taxon number and diversity indices of infauna declined significantly with water depth. Polychaetes, crustaceans and bivalves dominated the infaunal densities, biomass and species numbers. A total of 99 infauna taxa were identified, including at least three new species of polychaetes. This dataset is part of the Pacific Marine Arctic Regional Synthesis (PacMARS) Project. Multivariate analysis indicated that station groups "Chukchi slope," "Canada Basin abyss" and "Chukchi Cap" were moderately, but significantly, different in the infauna samples, but could not be similarly distinguished as such in the epifauna photographs. This data set contains the raw counts for each box core replicate sample, mostly per 0.06 m2 (20x30 cm) for replicates 1 and 2, and per 0.03 m2 for replicate 3. The second half of replicate three was used to sample for measurements of grain size, sediment organic carbon, etc. Those environmental data as well as mean station totals of abundance and biomass are in the related publication: MacDonald IR, Bluhm BA (shared 1st authorship), Iken K, Gagaev S, Strong S (2010) "Benthic macrofaunal and megafaunal assemblages in the Arctic deep-sea Canada Basin." Deep-Sea Research II 57:136-152. Species identifications were primarily conducted by the taxonomists listed in the data file.

本数据集收录了2005年6月28日至7月25日期间，于加拿大海盆高北极海域11个站位（水深范围817米至3961米），通过33台箱式采泥器（box core）采集的粒径大于250微米的软底质后生动物底内生物（metazoan infauna）。底内生物总丰度范围为每0.06平方米0.6至50个个体（即每平方米89至2722个个体），总生物量范围为每0.06平方米0.2至1.6克湿重（即每平方米不足0.1克至26.1克湿重）。各站位的底内生物分类单元数介于8至55之间。底内生物的丰度、生物量、分类单元数及多样性指数均随水深增加呈显著下降趋势。多毛类、甲壳类与双壳类为底内生物密度、生物量及物种数的优势类群。本次研究共鉴定出99个底内生物分类单元，其中至少包含3个多毛类新物种。本数据集属于太平洋海洋北极区域综合研究（Pacific Marine Arctic Regional Synthesis, PacMARS）项目的一部分。多元分析结果显示，楚科奇斜坡、加拿大海盆深渊区及楚科奇海台三个站位组的底内生物群落存在中度但显著的差异，但在底上生物（epifauna）照片中无法实现类似的群落区分。本数据集包含各箱式采泥器重复样品的原始计数数据：重复样品1和2的采样面积多为0.06平方米（20×30厘米），重复样品3的采样面积为0.03平方米。重复样品3的后半部分被用于沉积物粒度、沉积有机质碳等环境参数的测定采样。相关环境数据及各站位丰度、生物量的平均值可参阅以下已发表文献：MacDonald IR、Bluhm BA（共同第一作者）、Iken K、Gagaev S、Strong S（2010）《北极深海加拿大海盆的大型底栖动物及巨型底栖生物群落》，发表于《深海研究II辑（Deep-Sea Research II）》第57卷，第136-152页。物种鉴定工作主要由数据文件中列出的分类学家完成。