Interagency Special Status /
Sensitive Species Program (ISSSSP)
Species Index - Fauna / Mammals / Bats
Bat Grid Monitoring – Oregon and Washington
Study Summary
The study objective was to map species-specific baselines within Oregon and Washington of predicted occurrence probabilities, accounting for imperfect detection and annual turnover, against which future declines can be evaluated, models updated, and trends communicated through maps. These maps reflect an 8-year (2003-2010) monitoring effort from the Bat Grid Program. The dataset used for modeling was a subset of Bat Grid data using capture and acoustic survey results from 241 of the 4500 total number of 10 km x 10 km sample units (grid cells) across Oregon and Washington, USA.
Maps were produced from modeled predictions of probability of occurrence with Bayesian occupancy models using a subset of Bat Grid data that met specific criteria for modeling, including, for example, only records where data collection occurred between 1 June and 15 September, on nights where capture and recording efforts lasted ≥ 2 hours, etc... in order to ensure data integrity and model assumptions. Prediction error or uncertainty, the standard deviation of predicted probabilities (in Bayesian lingo, the std. dev. of the posterior probabilities), are mapped as well as the predictions themselves. We included 6 covariates in models as explanatory predictor variables: % cover of forest, % cover of cliffs and canyons, avg. snags/hectare, avg. elevation, std. dev. of elevation, avg. annual precipitation, all summarized per 10 km x 10 km Bat Grid sample unit. These maps are also available for download. We produced maps for 11 of the 14 species for which we built models. Antrozous pallidus, Corynorhinus townsendii, and Euderma maculatum were not well represented in the dataset (infrequently captured and recorded) and were not mapped, but models were developed and useful information on these species can be found in Rodhouse, Ormsbee, Irvine, and others (In press).
Manuscripts and Survey Protocol
- Establishing conservation baselines with dynamic distribution models for bat populations facing imminent decline - September 21, 2015
- Assessing the status and trend of bat population across broad geographic regions with dynamic distribution models. Ecological Applications 22(4), 2012, pp. 1098-1113. - Adobe .pdf File - 3.6M
- Placeholder - Survey
Geographic Information System (GIS) files
- Geodatabase - WinZip .zip File - 11M
Maps - Environmental Covariates Used in Models (All with Surveyed Units)
- Cliffs and Canyons - Tiff Image - 2.7M
- Forest Cover - Tiff Image - 2.7M
- Mean Elevation - Tiff Image - 2.7M
- Mean Precipitation - Tiff Image - 2.7M
- Snag Density - Tiff Image - 2.7M
- Standard Deviation of Elevation – Topographic Roughness - Tiff Image - 2.7M
- Study Area with Surveyed Units Used for Models, Eastside Species Masks, and Ecoregions - Tiff Image - 24M
Maps - Species-specific
Eptesicus fuscus, Big-brown bat
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Map s - Tiff Image - 2.7M
Lasiurus cinereus, Hoary bat
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Lasionycteris noctivagans, Silver-haired bat
- Predictive Distribution Map- Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis californicus, California myotis
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis ciliolabrum, Small-footed myotis
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis evotis, Long-eared bat
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis lucifugus, Little brown bat
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis thysanodes, Fringed myotis
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis volans, Long-legged myotis
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Myotis yumanensis, Yuma myotis
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M
Parastrellus hesperus, Canyon bat
- Predictive Distribution Map - Tiff Image - 2.7M
- Prediction Error Maps - Tiff Image - 2.7M