Biologists at USGS Patuxent, as well as cooperating agencies are constantly looking for new ways of answering questions about the status of animal populations and how animal populations change over time. To address these questions, data are collected on captures and or sightings of animals which can be used to estimate parameters which affect the population using legacy software. Over time, new questions and methods for addressing these questions arise which require new computer software.
Software packages are written at Patuxent to be general enough in scope, and user-friendly enough to be useful to many other scientists world-wide.
These programs are made available to the public via a worldwide-web server. Many of the programs can be used via a web-browser without the need to download the software. Others can be downloaded and run on any Windows, Mac or Linux computer. All programs include documentation and references to published literature on the methods used to produce the output.
Below are publications associated with this project.
COMDYN: Software to study the dynamics of animal communities using a capture-recapture approach
Occupancy Estimation and Modeling : Inferring Patterns and Dynamics of Species Occurrence
Below are software products associated with this project.
fatalityCMR
Capture-recapture software to correct raw counts of wildlife fatalities using trial experiments for carcass detecition probability and persistence time.
PRESENCE
Estimates patch occupancy rates and related parameters.
- Overview
Biologists at USGS Patuxent, as well as cooperating agencies are constantly looking for new ways of answering questions about the status of animal populations and how animal populations change over time. To address these questions, data are collected on captures and or sightings of animals which can be used to estimate parameters which affect the population using legacy software. Over time, new questions and methods for addressing these questions arise which require new computer software.
Software packages are written at Patuxent to be general enough in scope, and user-friendly enough to be useful to many other scientists world-wide.
These programs are made available to the public via a worldwide-web server. Many of the programs can be used via a web-browser without the need to download the software. Others can be downloaded and run on any Windows, Mac or Linux computer. All programs include documentation and references to published literature on the methods used to produce the output.
- Publications
Below are publications associated with this project.
COMDYN: Software to study the dynamics of animal communities using a capture-recapture approach
COMDYN is a set of programs developed for estimation of parameters associated with community dynamics using count data from two locations or time periods. It is Internet-based, allowing remote users either to input their own data, or to use data from the North American Breeding Bird Survey for analysis. COMDYN allows probability of detection to vary among species and among locations and time perOccupancy Estimation and Modeling : Inferring Patterns and Dynamics of Species Occurrence
This is the first book to examine the latest methods in analyzing presence/absence data surveys. Using four classes of models (single-species, single-season; single-species, multiple season; multiple-species, single-season; and multiple-species, multiple-season), the authors discuss the practical sampling situation, present a likelihood-based model enabling direct estimation of the occupancy-rela - Software
Below are software products associated with this project.
fatalityCMR
Capture-recapture software to correct raw counts of wildlife fatalities using trial experiments for carcass detecition probability and persistence time.
PRESENCE
Estimates patch occupancy rates and related parameters.