Biology and Ecosystems

Learn more about animal population analysis, and access, explore, and download U.S. species occurrence data.

Filter Total Items: 69
Date published: November 14, 2017


Capture-recapture software to correct raw counts of wildlife fatalities using trial experiments for carcass detecition probability and persistence time.

Date published: July 25, 2017

USGS Sea Ice Email Script, 2017

Daily sea ice imagery and charting benefits logistics and navigational planning in the Alaskan Arctic waters, yet access to these data often requires high bandwidth data access and substantial GIS processing.

Date published: July 6, 2017

Evidence of Absence (EoA) Software and User's Guide

Software to Estimate Bird and Bat Fatality at Wind Farms

Date published: June 20, 2017

Model selection in Cormack-Jolly-Seber mark-recapture investigations

Cormack-Jolly-Seber (CJS) mark-recapture models are widely utilized in ecology, providing estimates of vital rates and abundance that are difficult to obtain using other means.

Date published: June 20, 2017

QFASA robustness to assumption violations

Quantitative fatty acid signature analysis (QFASA; Iverson et al. 2004) has become a common method of estimating diet composition, especially for marine mammals, but the performance of the method has received limited investigation.

Date published: May 31, 2017


eDNAoccupancy allows users to specify and fit multi-scale occupancy models with or without covariates, to estimate posterior summaries of occurrence and detection probabilities, and to compare different models using Bayesian model-selection criteria.

Date published: April 12, 2017

Evolutionary Ecology Software

The programs perform input file formation, distribution visualization, individual-based dynamic population simulation, pedigree accuracy assessment, effective population si

Date published: March 8, 2017

Random Landscape Tool 10.5

Random Landscape Tool uses a raster data source and a table of classifications to create a random landscape. The classification table allows the user to weight the probability of occurrence to certain classes and to spatially restrict the distribution of classes to certain areas (zones).  

Date published: February 15, 2017

Lake Erie Fish Community Data Explorer

This data exploration tool is intented for use by researchers, resource managers, and the public to better understand the status of the fish community in Lake Erie.

Date published: January 10, 2017

Quantitative Fatty Acid Signature Analysis in R (qfasar)

Quantitative fatty acid signature analysis (QFASA) is a method of diet estimation introduced over a decade ago (Iverson et al. 2004). 

Date published: May 2, 2016

Wildlife Software and Models

A suite of software tools and models developed by Colorado State University and the USGS Colorado Cooperative Fish And Wildlife Research Unit.