Realm: Freshwater
Climate: Temperate
Biome: Small Lake Ecosystems
Central latitude: 44.324240
Central longitude: -89.565030
Duration: 38 years, from 1981 to 2019

3163 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. A boom style electrofishing system is used to sample the littoral zone fish community. Prior to 1997, four electrofishing transects were done on each lake. In 1997, the number of transects was reduced to 3. The same transects are used each year. Each transect consists of 30 minutes of current output, with the boat moving parallel to shore in 1-2 meters of water at a slow steady speed. We use the DC pulse system, with 240 volts at 3-5 amps. Transect lengths vary depending upon the size of the lake. If the end of a transect is reached before 30 minutes has elapsed, time is paused while the electrofisher loops back to the start of the transect. The transect is then repeated for the remaining time. Abundance is Catch per unit effort, so the total yearly catches have been divided by effort. This data is only referring to Electrofishing catches and it's part of the North Temperate Lakes LTER sampling. For electrofishing sampling, effort is given by the number of transect made, so abundance as Catch Per Unit Effort is the total yearly catch divided by the number of transects performed each year.

Citation(s)

@Dataset{BioTIME_cit22, Study_id = {869}, 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} }