Realm: Freshwater
Climate: Temperate
Biome: Small Lake Ecosystems
Central latitude: 46.100000
Central longitude: -89.700000
Duration: 4 years, from 1987 to 2020

1231 records

47 distinct species

Across the time series Vallisneria americana is the most frequently occurring species

Methods

Macrophytes were sampled in ten lakes in Vilas County, Wisconsin, USA during summer sampling events in 1987, 2002, 2011, and 2020. Macrophytes were sampled during July and August at a subset of crayfish sampling sites within ten study lakes (n = 614 sites per lake) that were selected in 1987 to capture a variety of substrates and both east and west sun exposure. Sampling depths were randomly assigned to sites during initial sampling in 1987 as either 0.75 m, ½ of Secchi depth, or ¾ of Secchi depth, with 1987 Secchi depths used for all subsequent sampling years for macrophyte surveys. Authors followed the line-intercept method to sample macrophytes, using snorkeling and SCUBA to visually identify and determine the presence or absence of macrophyte species along a 25 m transect set parallel to shore at the pre-determined depth for each sampling site. Transects were marked at 1 m intervals, with the first 10 cm of each interval marked by a band of tape. Divers moved along the transect recording the presence or absence of each macrophyte species crossing the vertical plane of each 10 cm band. The line-intercept method allowed us to obtain a measure of both macrophyte species richness and abundance. Because just presence or absence of macrophyte species was recorded, and only at each 10 cm band, our measurements provide an index for abundance and a minimum estimate for species richness. In 2020, the authors were not able to sample macrophytes using SCUBA due to limitations from the COVID-19 pandemic, and therefore excluded a small portion of deeper sites (approximately 2% of total macrophyte sites and 13% of total snail sites) that could not be sampled accurately and safely while snorkeling. In addition, because of a few lost samples, data from previous sampling years were not always available for each site. Consequently, the macrophyte dataset only includes sites for which data were available for all four sampling years (n = 100 sites/year). Sampling depths were used for DepthElevation field, not lake overall elevation.

Citation(s)

@Dataset{BioTIME_cit431, Study_id = {700}, Citation_id = {431}, Author = {Szydlowski, Daniel K. and Elgin, Ashley K. and Lodge, David M. and Tiemann, Jeremy S. and Larson, Eric R.}, Publisher = {Environmental Data Initiative.}, Title = {Aquatic macrophyte, snail, and crayfish abundance and richness data for ten lakes in Vilas County, WI, USA, 1987-2020 ver 3.}, Year = {2022}, Doi = {10.6073/pasta/f10681ca29a9a69e9597bcd77a06fbe5}, Url = {doi.org/10.6073/pasta/f10681ca29a9a69e9597bcd77a06fbe5}, Language = {English}, Version = {3} }