North Temperate Lakes LTER: Pelagic Macroinvertebrate Abundance 1983 - current

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. 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

研究人员在鳟湖（Trout Lake）区域的7个主要湖泊的最深点位各开展5次垂直拖网采样，所用采样网具的网目孔径为1毫米，网口宽度为1米。这7个主要湖泊包括阿勒夸什湖（Allequash）、大马斯卡伦奇湖（Big Muskellunge）、水晶湖（Crystal）、斯帕克林湖（Sparkling）、鳟湖（Trout Lake），以及27-02号沼泽湖（Crystal Bog）和12-15号沼泽湖（Trout Bog）。针对鳟湖，研究人员额外增设4个采样点位，各点位水深分别约为10米、15米、20米及25米，每个点位开展3次垂直拖网采样。所有采样均在夜间无光环境下进行。采集的样本经固定保存后进行计数，统计得到捕获生物的数量。本次夜间拖网采样的目标为远洋浮游动物群落中的大型无脊椎浮游食性生物类群。采样频率：每年1次。采样点位总数：11个。