Brook trout occupancy in the Mixedwood Plains Ecozone, Ontario
Cite this dataset
Chu, Cindy et al. (2022). Brook trout occupancy in the Mixedwood Plains Ecozone, Ontario [Dataset]. Dryad. https://doi.org/10.5061/dryad.ht76hdrhd
Abstract
The Ontario Ministry of Northern Development, Mines, Natural Resources and Forestry compiled brook trout presence and absence data for rivers and streams within the Mixedwood Plains Ecozone of Ontario. Data from hundreds of electrofished sites were grouped into two time periods, past (1970-1980) and recent (2000-2010), to quantify the change in brook trout occupancy in streams of the Mixedwood Plains Ecozone in Ontario at different spatial scales. The data include information for five spatial scales: 1) tertiary watersheds; 2) quaternary watersheds; 3) the well-sampled Credit River-Sixteen Mile Creek tertiary watershed; and, 4) sites within 50 m of each other were sampled in both the past (1970-1980) and recent (2000-2010) periods, and 5) at each spatial scale brook trout occupancy along the longitudinal axes of the rivers was assessed using Strahler stream order. This data set will be cited in a manuscript that quantifies the declines in brook trout occupancy in rivers and streams of southern Ontario.
Methods
Brook trout presence or absence data were extracted from a compilation of electrofishing sampling data collected by the Ontario Ministry of Northern Development, Mines, Natural Resources and Forestry, 22 Conservation Authorities, Fisheries and Oceans Canada, and the Royal Ontario Museum. Additional site data include tertiary or quaternary watershed codes, the number of sites where brook trout were present, the number of sites where brook trout were absent, the Strahler stream order of the sites, and the mean number of times the sites were sampled during the past (1970-1980) and recent (2000-2010) time periods.
Usage notes
tertiary_model_input_data.csv: tertiary watershed level data
Watershed_ID: tertiary watershed code
Time_period: past (1970-1980) or recent (2000-2010) period
Stream_order: Strahler stream order
Sites_with_BT_present: number of sites with brook trout present
Sites_with_BT_absent: number of sites with no brook trout
Sample_number: mean number of times site was sampled during each period
quaternary_model_input_data.csv: quaternary watershed level data
Watershed_ID: quaternary watershed code
Time_period: past (1970-1980) or recent (2000-2010) period
Stream_order: Strahler stream order
Sites_with_BT_present: number of sites with brook trout present
Sites_with_BT_absent: number of sites with no brook trout
Sample_number: mean number of times site was sampled during each period
credit_16mile_model_input_data.csv: credit-sixteen mile tertiary watershed data for within watershed analysis
Time_period: past (1970-1980) or recent (2000-2010) period
Stream_order: Strahler stream order
Sites_with_BT_present: number of sites with brook trout present
Sites_with_BT_absent: number of sites with no brook trout
Sample_number: mean number of times site was sampled during each period
overlapping_model_input_data.csv: site data for sites with 50 m of each other that were sampled during the past and recent periods.
SITE_CODE: unique identifier for each site
Time_period: past (1970-1980) or recent (2000-2010) period
BT_present: 0 or 1 for brook trout absence (0) or presence (1)
Stream_order: Strahler stream order of site
Sample_number: number of times site was sampled during each time period
Funding
Ministry of Natural Resources and Forestry
Canada-Ontario Agreement on Great Lakes Water Quality and Ecosystem Health