1. General Model Information

Name: Program to Assist in Tracking Critical Habitat

Acronym: PATCH

Main medium: terrestrial
Main subject: population dynamics
Organization level: Landscape, Population
Type of model: individual-based
Main application:
Keywords: individual-based model, IBM, spatially explicit, population dynamics, population viability analysis, PVA, landscape, landscape ecology, simulator, habitat pattern, fragmentation, habitat loss, landscape change


Nathan H. Schumaker
US EPA, 200 SW 35th Street,
Corvallis, Oregon, 97333, USA
Phone: (541) 754-4658
Fax: (541) 754-4716
email: nathan@mail.cor.epa.gov
Homepage: http://www.epa.gov/wed/pages/models.htm


Nathan H. Schumaker


PATCH is a spatially explicit, individual-based, life history simulator designed to project populations of territorial terrestrial vertebrate species through time. PATCH is ideal for investigations involving wildlife species that are mobile habitat specialists. PATCH's data requirements are minimal. It must be supplied with habitat maps, specifications for habitat use (territory size and habitat affinity), vital rates (survival and reproduction), and descriptions of a species' movement behavior. PATCH's outputs fall into two general categories: pattern-based metrics and demographic analyses. Pattern-based outputs include patch-by-patch descriptions of landscapes, assessments of the number, quality, and spatial orientation of breeding sites, and map-based estimates of the occupancy rate and the source-sink behavior of breeding habitat. PATCH's principal demographic outputs include several measures of population size as a function of time, realized survival and fecundity rates (rates that reflect the limitations on a population imposed by habitat quality and landscape pattern), and assessments of the occupancy rate and source-sink behavior of the breeding sites present in a landscape.

II. Technical Information

II.1 Executables:

Operating System(s): Solaris, LINUX

II.2 Source-code:

Programming Language(s): C

II.3 Manuals:

A Users Guide to the PATCH Model

II.4 Data:

GIS habitat maps in Sun Rasterfile format
Estimates of Habitat Affinity, or HUI Values
Territory Size
Vital Rates
Movement Ability

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

http://www.epa.gov/wed/pages/models.htm EPA - Western Ecology Division

VI. Additional remarks

Last review of this document by: Sat Sep 4 00:49:47 1999
Status of the document: Contributed by Nathan H. Schumaker
last modified by Tobias Gabele Wed Aug 21 21:44:47 CEST 2002

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