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
Contact:
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
Author(s):
Nathan H. Schumaker
Abstract:
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
http://www.epa.gov/wed/pages/models.htm
II.2 Source-code:
Programming Language(s): C
II.3 Manuals:
A Users Guide to the PATCH Model
http://www.epa.gov/wed/pages/models.htm
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