Realm: Freshwater
Climate: Temperate
Biome: Small Lake Ecosystems
Central latitude: 44.324240
Central longitude: -89.565030
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. Night seining is conducted on 6 seine sites per lake, each consisting of 100 meters of shoreline. Prior to 1997 this was subdivided into 3 seine hauls, each covering 33 meters. In 1997, seine hauls were reduced to 2 hauls of 33m each. The final section of the site is used as an alternate seine site in the event of difficulty in one of the first two hauls. The seine used is 12.2 m long by 1.2 m deep, consisting of two 5.5 x 1.2 m wings surrounding a 1.2 x 1.2 x 1.2 m central bag. The wings are made of 6.4 mm stretch measure knitted delta-strength nylon mesh, and the bag is of 3.2 mm delta strength nylon mesh. The entire net is tarred. The two wings and the opening to the bag have weighted foot ropes and buoyed head ropes. An 8m length of rope is tied between the seine poles as a guide for the maximum spread of the seine. Abundance is Catch per unit effort, so the total yearly catches have been divided by effort. This data is only referring to Night seining catches and it's part of the North Temperate Lakes LTER sampling. For night seine sampling, effort is given by the number of hauls, so abundance as Catch Per Unit Effort is the total yearly catch divided by hauls performed each year.

Citation(s)

@Dataset{BioTIME_cit22, Study_id = {873}, 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} }