North Temperate Lakes LTER: Pelagic Macroinvertebrate Summary 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. 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. These night tows target the large invertebrate planktivore component of
the pelagic zooplankton community. Sampling Frequency: annually Number of sites: 11