Mule Deer Migration Corridors - Salt Springs - 2018-2020 [ds2975]
type: Dataset
description: The project leads for the collection of this data were Sara Holm and Julie Garcia. Mule deer (8 adult females) from the Salt Springs herd were captured and equipped with Lotek Iridium Track MGPS collars, transmitting data from 2018-2020. GPS fixes were between 11-14 hours. The Salt Springs herd migrates from winter ranges in the western foothills of the Sierra Nevada range to high altitude terrain near Lower Bear River Reservoir and Salt Springs Reservoir. To improve the quality of the data set as per Bjørneraas et al. (2010), the GPS data were filtered prior to analysis to remove locations which were: i) further from either the previous point or subsequent point than an individual deer is able to travel in the elapsed time, ii) forming spikes in the movement trajectory based on outgoing and incoming speeds and turning angles sharper than a predefined threshold , or iii) fixed in 2D space and visually assessed as a bad fix by the analyst. The methodology used for this migration analysis allowed for the mapping of winter ranges and the identification of migration corridors. Brownian Bridge Movement Models (BBMMs; Sawyer et al. 2009) were constructed with GPS collar data from 6 migrating deer, including 13 migration sequences, location, date, time, and average location error as inputs in Migration Mapper. The average migration time and average migration distance for deer was 18.53 days and 27.44 km, respectively. Corridors and stopovers were prioritized based on the number of animals moving through a particular area. BBMMs were produced at a spatial resolution of 50 m using a sequential fix interval of less than 27 hours. Due to the majority of BBMMs producing variance rates greater than 8000, a fixed motion variance of 1000 was set per migration sequence. Winter range analyses were based on data from 6 individual deer and 8 wintering sequences using a fixed motion variance of 1000. Winter range designations for this herd may expand with a larger sample, filling in so…
issued: 2022-02-17T20:41:21+00:00
modified: 2022-02-17T20:41:28.020000+00:00
contact point: Organization
  fn: BIOS_Admin
keyword: amador
keyword: amerigeo
keyword: amerigeoss
keyword: authcdfw
keyword: brownian-bridge-movement-model
keyword: calaveras
keyword: california
keyword: california-department-of-fish-and-wildlife
keyword: california-natural-resources-agency
keyword: caopendata
keyword: cdfw
keyword: ckan
keyword: connectivity
keyword: ds297520220204wm
keyword: el-dorado
keyword: geo
keyword: geoss
keyword: gps
keyword: migration
keyword: migration-mapper
keyword: mule-deer
keyword: national
keyword: north-america
keyword: odocoileus-hemionus
keyword: salt-springs
keyword: stopover
keyword: telemetry
keyword: united-states
keyword: winter-range
theme: {"Natural Resources"
theme: Water}

ArcGIS Hub Dataset
type: Distribution
format: HTML
issued: 2022-04-28T01:52:59.953779
modified: 2025-11-20T22:48:19.118640
access URL: https://gis.data.cnra.ca.gov/maps/CDFW::mule-deer-migration-corridors-salt-springs-2018-2020-ds2975

Shapefile
type: Distribution
format: ZIP
issued: 2022-04-28T01:52:59.953798
modified: 2025-11-20T22:48:19.120585
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::mule-deer-migration-corridors-salt-springs-2018-2020-ds2975.zip
media type: application/zip

CSV
type: Distribution
format: CSV
issued: 2022-04-28T01:52:59.953793
modified: 2025-11-20T22:48:19.119831
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::mule-deer-migration-corridors-salt-springs-2018-2020-ds2975.csv
media type: text/csv

KML
type: Distribution
format: KML
issued: 2022-04-28T01:52:59.953795
modified: 2025-11-20T22:48:19.120211
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::mule-deer-migration-corridors-salt-springs-2018-2020-ds2975.kml
media type: application/vnd.google-earth.kml+xml

GeoJSON
type: Distribution
format: GeoJSON
issued: 2022-04-28T01:52:59.953790
modified: 2025-11-20T22:48:19.119451
access URL: https://gis.data.cnra.ca.gov/datasets/CDFW::mule-deer-migration-corridors-salt-springs-2018-2020-ds2975.geojson
media type: application/geo+json

ArcGIS GeoService
type: Distribution
format: ArcGIS GeoServices REST API
issued: 2022-04-28T01:52:59.953786
modified: 2025-11-20T22:48:19.119060
access URL: https://services2.arcgis.com/Uq9r85Potqm3MfRV/arcgis/rest/services/biosds2975_fpu/FeatureServer/0
media type: application/octet-stream

US Migrating
type: Agent