Past and Present Freshwater Lake Environments on Macquarie Island

Samples were collected between 1998 and 1992 on Macquarie Island from existing water bodies and from exposed lake sediments up to 14,000 years old. The dataset comprises a taxa list of 131 non-marine diatoms, water quality (pH and conductivity) in nine lakes, and a presence absence table of species by lake.

The lists show freshwater diatom taxa observed in Macquarie Island lakes based on samples of lake sediments, rock scrapings and macrophytes. At least 300 diatom valves were identified on each sample. The results were reported in the references given below.

Ainsworth Lake (situated on the plateau at the southern end of Macquarie Island). The taxa list is derived from 8 samples collected between Oct 1988 and Dec 1992.

Brothers Lake (situated on the eastern edge of the Macquarie Island plateau). The taxa list is derived from 10 samples collected between Oct 1988 and Dec 1992.

Duck Lagoon (situated on the western coastal plain of Macquarie Island). The taxa list is derived from 15 samples collected between 1988-90.

Green Gorge Tarn (situated on the eastern coastal plain of Macquarie Island). The taxa list is derived from 8 samples collected between Oct 1988 and Dec 1992.

Major Lake (situated on the plateau of Macquarie Island). The taxa list is derived from 9 samples collected between Oct 1988 and Dec 1992.

Palaeolake Skua (formerly located on the western edge of the Macquarie Island plateau covering the site of the present smaller Skua Lake. The basal layer of exposed lake sediments is about 13,000 years old). The taxa list is from 32 samples regularly spaced vertically along the exposed sediments.

Pyramid Lake (situated on the plateau of Macquarie Island). The diatom taxa list is derived from 5 samples collected between Oct 1988 and Dec 1992.

Skua Lake (situated on the western margin of the Macquarie Island plateau). The taxa list is derived from 8 samples collected between 1988-89.

Square Lake (situated on the plateau of the island). The taxa list is derived from 6 samples collected between 1990-92.

Tulloch Lake (situated on the plateau of Macquarie Island). The taxa list is derived from 10 samples collected between Oct 1988 and Dec 1992.

The fields in this dataset are:

Species
ph
conductivity
Lake
Presence
Absence

本数据集的样本于1988年至1992年间在麦夸里岛采集，采样来源包括现存水体以及距今最高达14000年的裸露湖相沉积物。本数据集涵盖131种非海洋硅藻（non-marine diatoms）的类群清单、9个湖泊的水质数据（酸碱度（pH）与电导率（conductivity）），以及按湖泊分类的物种出现与否表（presence absence table）。

本类群清单基于湖相沉积物、岩石刮取物及大型水生植物的样本，记录了麦夸里岛湖泊中观测到的淡水硅藻类群。每份样本均完成至少300个硅藻壳瓣的鉴定工作，相关研究结果已在下文列出的参考文献中发表。

安斯沃思湖（Ainsworth Lake）坐落于麦夸里岛南端的高原之上，其类群清单源自1988年10月至1992年12月间采集的8份样本。

兄弟湖（Brothers Lake）坐落于麦夸里岛高原的东缘，其类群清单源自1988年10月至1992年12月间采集的10份样本。

达克潟湖（Duck Lagoon）坐落于麦夸里岛西部沿海平原，其类群清单源自1988年至1990年间采集的15份样本。

格林峡谷潭（Green Gorge Tarn）坐落于麦夸里岛东部沿海平原，其类群清单源自1988年10月至1992年12月间采集的8份样本。

马杰尔湖（Major Lake）坐落于麦夸里岛高原之上，其类群清单源自1988年10月至1992年12月间采集的9份样本。

古湖斯库阿（Palaeolake Skua）原位于麦夸里岛高原西缘，覆盖了现今较小的斯库阿湖遗址，其裸露湖相沉积物的底层年代约为13000年。该数据集的类群清单源自沿裸露沉积物垂直等距采集的32份样本。

金字塔湖（Pyramid Lake）坐落于麦夸里岛高原之上，其硅藻类群清单源自1988年10月至1992年12月间采集的5份样本。

斯库阿湖（Skua Lake）坐落于麦夸里岛高原西缘，其类群清单源自1988年至1989年间采集的8份样本。

斯夸尔湖（Square Lake）坐落于该岛高原之上，其类群清单源自1990年至1992年间采集的6份样本。

塔洛赫湖（Tulloch Lake）坐落于麦夸里岛高原之上，其类群清单源自1988年10月至1992年12月间采集的10份样本。

本数据集包含以下字段：
物种（Species）、酸碱度（pH）、电导率（conductivity）、湖泊（Lake）、出现（Presence）、缺失（Absence）