Soft sediment assemblages at Casey Station: Brown Bay Grid - samples taken along a pollution gradient.

A survey of macrobenthic assemblages in soft-sediments was done at Casey Station, East Antarctica. Samples were taken along four transects in Brown Bay, along a pollution gradient that has its source at an abandoned waste tip on the shore of Brown Bay. The transects were up to 300 M long and there were 9 sampling stations on each transect except for transect four which had only 4 sampling stations. Sampling stations were at the following distances from the shoreline and tip site: 10 m, 20 m, 30 m, 40 m, 50 m, 100 m, 150 m, 200 m, and 300 m. Two cores of the soft-sediment assemblages were taken at each sampling station and two cores for analysis of heavy metals and hydrocarbons.

Samples were taken by divers using hand-held corers (fauna core size - 10 cm diameter by 10 cm deep; sediment analysis cores - 5 cm diam. by 10 cm deep). The aims were: 1) to determine the nature and extent of the contamination gradient in front of the tip site and; 2) to determine if there was a corresponding response in the soft-sediment assemblages along the contamination gradient.

A total of 62 samples of soft-sediment assemblages and 62 samples for heavy metal and hydrocarbon analysis were taken. Sediment grain size was also examined at each sampling point. The benthic diatom communities were also analysed in each sample.

Links to ASAC 1100.

The fields in this dataset are:

Distance
Position
Site and replicate
Species
Quality:
Gammarid, Isopod, gastropod faunas identified at the Australian Museum. Remaining faunas identified by J. Stark. Diatoms identified by L. Cunningham.

2018-09-25 - The original datasheet was reformatted to fit OBIS/GBFI/IPT Biodiversity.AQ standardS. The new datasheet 'caseySurvey_BBGinfauna.csv\" provides datasetID, occurrenceID, eventID, locality, locationID, decimalLatitude, decimalLongitude, continent, countryCode, eventDate, occurrenceStatus, organismQuantity, organismQuantityType, basisOfRecord, institutionCode, and protocol. The lowest taxonomical rank of the species identified that could be determined is provided, after matched in WoRMS (World Register of Marine Species).

本数据集针对南极东部凯西站（Casey Station）的软沉积物（soft-sediments）大型底栖生物群落（macrobenthic assemblages）开展了调查研究。采样工作在布朗湾（Brown Bay）沿四条样带（transects）展开，采样梯度为以布朗湾沿岸一处废弃废料场为污染源的污染梯度。各条样带最长可达300米，每条样带设置9个采样站位（sampling stations），但第四条样带仅设4个采样站位。各采样站位与海岸线及废料场的距离分别为：10 m、20 m、30 m、40 m、50 m、100 m、150 m、200 m及300 m。

每个采样站位采集2柱软沉积物生物样品，同时采集2柱用于重金属与烃类分析的沉积物样品。采样由潜水员使用手持采芯器（corers）完成：生物样品采芯规格为直径10 cm、深度10 cm；沉积物分析采芯规格为直径5 cm、深度10 cm。

本研究的目标为：1）明确废料场前方污染梯度的性质与范围；2）探究沿污染梯度分布的软沉积物群落是否存在相应的响应变化。

本次调查共采集软沉积物生物样品62份，重金属与烃类分析样品62份。同时在每个采样点检测了沉积物粒度组成，并对所有样品中的底栖硅藻（benthic diatom）群落进行了分析。

本数据集关联ASAC 1100项目。

本数据集包含以下字段：
距离（Distance）、站位（Position）、采样点与重复样（Site and replicate）、物种（Species）、质量（Quality）：
端足类（Gammarid）、等足类（Isopod）及腹足类（gastropod）动物群由澳大利亚博物馆完成鉴定，其余动物群由J. Stark完成鉴定，硅藻由L. Cunningham完成鉴定。

2018年9月25日——原始数据表已重新格式化，以符合OBIS/GBFI/IPT Biodiversity.AQ标准。新数据表"caseySurvey_BBGinfauna.csv"包含以下字段：datasetID、occurrenceID、eventID、locality、locationID、decimalLatitude、decimalLongitude、continent、countryCode、eventDate、occurrenceStatus、organismQuantity、organismQuantityType、basisOfRecord、institutionCode及protocol。所有经世界海洋物种登记册（World Register of Marine Species, WoRMS）匹配后的物种，将提供可鉴定到的最低分类学等级。