DOI: 10.5061/dryad.ht76hdrhd
title: Brook trout occupancy in the Mixedwood Plains Ecozone, Ontario

description: 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.
description: 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.
description: <strong>tertiary_model_input_data.csv</strong>:
 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
 <strong>quaternary_model_input_data.csv</strong>:
 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
 <strong>credit_16mile_model_input_data.csv</strong>:
 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
 <strong>overlapping_model_input_data.csv</strong>:
 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