North Temperate Lakes LTER: Pelagic Macroinvertebrate Summary 1983 - current (Reformatted to the ecocomDP Design Pattern)

This data package is formatted as an ecocomDP (Ecological Community
Data Pattern). For more information on ecocomDP see
https://github.com/EDIorg/ecocomDP. This Level 1 data package was
derived from the Level 0 data package found here: https://pasta.lternet.edu/package/metadata/eml/knb-lter-ntl/14/32.
The abstract below was extracted from the Level 0 data package and
is included for context: This is a summary of dataset NTL 13. Derived data include the mean and standard deviation of the number of each species captured as well as the mean and standard deviation of the density of individuals on both an areal and volumetric basis.
Five vertical tows are done at the deepest point of each of the seven primary lakes in the Trout Lake area (Allequash, Big Muskellunge, Crystal, Sparkling, and Trout lakes and bog lakes 27-02 [Crystal Bog], and 12-15 [Trout Bog]) using a 1-mm mesh net with a 1-m wide mouth. On Trout Lake four additional sites are sampled, where depths are approximately at 10 m, 15 m, 20 m, and 25 m respectively, with three tows done at each site. Trout Lake was the only lake sampled in 2020. All samples are taken in darkness. Samples are preserved and counted, yielding numbers caught. These night tows target the large invertebrate planktivore component of the pelagic zooplankton community. Sampling Frequency: annually Number of sites: 11

本数据包采用ecocomDP（Ecological Community Data Pattern，生态群落数据模式）格式进行组织。有关ecocomDP的更多详情，请参阅：https://github.com/EDIorg/ecocomDP。本一级数据包源自指定的零级数据包，其元数据地址为：https://pasta.lternet.edu/package/metadata/eml/knb-lter-ntl/14/32。

以下摘要是从该零级数据包中提取的，用于提供背景信息：本数据集为NTL 13号数据集的汇总内容。衍生数据包含各捕获物种的个体数量均值与标准差，以及基于面积和体积两种统计基准的种群密度均值与标准差。

研究团队使用网口宽度1米、网目尺寸1毫米的采样网，在鳟湖区域内7个主要湖泊的最深点位各开展5次垂直拖网采样，这7个湖泊分别为：阿勒夸什湖（Allequash）、大 Muskellunge 湖（Big Muskellunge）、水晶湖（Crystal）、斯帕克林湖（Sparkling）、鳟湖（Trout Lake），以及沼泽湖27-02号（水晶沼泽湖，Crystal Bog）与12-15号（鳟沼泽湖，Trout Bog）。针对鳟湖，研究团队额外增设4个采样点位，对应水深分别约为10米、15米、20米与25米，每个点位开展3次垂直拖网采样。2020年仅对鳟湖开展了采样作业。

所有采样均在夜间进行。采集的样本经固定处理后进行物种计数，得到各物种的捕获个体数。本次夜间拖网采样的目标对象为远洋浮游动物群落中的大型无脊椎动物浮游食性类群。

采样频率：每年1次；总采样点位数量：11个。