Realm: Freshwater
Climate: Temperate
Biome: Small Lake Ecosystems
Central latitude: 44.630740
Central longitude: -89.529080
Duration: 39 years, from 1981 to 2019

3263 records

70 distinct species

Across the time series Perca flavescens is the most frequently occurring species

Methods

The same sampling sites are used each year. All sampling occurs between the 3rd week of July and Labor Day. Sampling sites were chosen by random process in 1981 for the Northern lakes (Trout, Allequash, Sparkling, Crystal, and Big Muskellunge). Sites for Lake Mendota were chosen in 1981, and for the other Madison lakes (Monona, Fish, and Wingra) in 1995. All sites are identified with GPS coordinates, except on the bog lakes (Trout Bog and Crystal Bog) where nets are placed equal distances apart around the entire circumference of the lake in approximately the same locations each year. Gill nets are set at the deepest point of all LTER lakes except Crystal Bog, Trout Bog, and Fish Lake. The nets are set for two consecutive 24 hour sets. The gill nets are a set of 7 nets, each in a different mesh size, hung vertically on foam rollers from the surface to the bottom of the lake, and chained together in a line. Each net is 4 m wide and 33 m long. From 1981 through 1990 the nets were multifilament mesh, in stretched mesh sizes of 19, 25, 32, 38, 51, 64, and 89 mm. In 1991, the multifilament nets were replaced with monofilament nets of the same sizes. Stretcher bars are installed at 10 meter intervals from the bottom to keep the net as rectangular as possible when deployed. Catches for all the net sizes per each sampling event were pooled. Abundance is Catch per unit effort, so the total yearly catches have been divided by effort. This data is only referring to Gill nets' catches and it's part of the North Temperate Lakes LTER sampling. For gill nets sampline, effort is given by the number of nets used, so abundance as Catch Per Unit Effort is the total yearly catch divided by the number of nets deployed and recollected each year.

Citation(s)

@Dataset{BioTIME_cit22, Study_id = {871}, Citation_id = {22}, Author = {Magnuson, J. J. and Carpenter, S. R. and Stanley, E. H.}, Publisher = {Environmental Data Initiative}, Title = {North Temperate Lakes LTER: Fish Abundance 1981 - current ver 44}, Year = {2022}, Doi = {10.6073/pasta/a67e0c820fd507f62eee2e5f675b35da}, Url = {doi.org/10.6073/pasta/a67e0c820fd507f62eee2e5f675b35da}, Language = {English}, Version = {ver 44} }