Realm: Freshwater
Climate: Temperate
Biome: Small Lake Ecosystems
Central latitude: 45.060120
Central longitude: -89.575970
Duration: 40 years, from 1981 to 2021

97 records

8 distinct species

Across the time series Umbra limi 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. Crayfish traps are set on all lakes except the bog lakes (Crystal Bog and Trout Bog). Prior to 1998, five traps were set at each fyke net site. Beginning 1998, three traps are set per site. Minnow traps and crayfish traps are set in shallow water (approx 1 m), 2 traps on one side, and 1 trap on the other side of the fyke net lead. Minnow traps are baited with 1 slice of bread, and crayfish traps with 120 g of beef liver. Traps are fished for approximately 24 hours. Crayfish are identified to species. Minnows caught in either crayfish or minnow traps are identified to species, and measured for total length. Minnow traps are galvanized steel two piece traps, 44.5 cm long by 30.5 cm maximum diameter with 2.5 cm diameter openings at the ends. The mesh size is 6.4 mm on a side. Crayfish traps are identical, but the opening hole of both sides of the trap has been forced to 5 to 7 cm. Crayfish sampling was terminated for the southern lakes in 2004 after it was determined that the catch per unit effort was too low (2 crayfish caught in 500+ traps). Abundance is Catch per unit effort, so the total yearly catches have been divided by effort. This data is only referring to Minnow traps' catches and it's part of the North Temperate Lakes LTER sampling.For minnow trapping, effort is given by the number of traps, so abundance as Catch Per Unit Effort is the total yearly catch divided by the trap deployed and recollected each year.

Citation(s)

@Dataset{BioTIME_cit22, Study_id = {872}, 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} }