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## [ai-geostats] spatial population dynamics simulation

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• Dear list members, I m trying to build a spatial simulation model of population dynamics and wanted to ask for your input and suggestions on how to accomplish
Message 1 of 1 , Oct 28, 2004
Dear list members,

I'm trying to build a spatial simulation model of population dynamics and
wanted to ask for your input and suggestions on how to accomplish this. The
characteristics of the model are as follows:
1) The model consists of 100 (or more) discrete populations at randomly
picked locations on a regular grid. I want to have enough populations to
later do spatial statistics such as variograms on the populations.
2) Each population has the basic population dynamics of birth (birth rate
limited by carrying capacity), death, emigration as a fraction of the
population size, and immigration as whatever comes from other populations.
3) The populations differ in their carrying capacities to simulate different
habitat qualities. I would like to distribute carrying capacities over the
grid so that they are randomly distributed with a certain degree of spatial
autocorrelation.
4) All populations are connected via emigration and immigration. The closer
together they are, the stronger the connection (i.e., the higher the
dispersal rate between them). If a certain number of individuals emigrate
from a population as determined by a fixed fraction of the population size,
I could either distribute them in a stochastic manner to other populations
with the probability of drawing an individual inversely related to the
distance or distribute fractions of individuals deterministically according
to the distance of the neighbors.

Do you have suggestions on how to accomplish this? I'm fairly proficient in
Splus, STELLA (that's what I built the population dynamics model in) and
ArcView (but not Avenue or ArcInfo). I would not be able to program this
from scratch in C or a similar programming language.

Thank you.

Volker

_______________________________

Volker Bahn

Dept. of Wildlife Ecology - Rm. 210
University of Maine
5755 Nutting Hall
Orono, Maine
04469-5755, USA
Tel. (207) 581 2799
Fax: (207) 581 2858
volker.bahn@...
http://www.wle.umaine.edu/used_text%20files/Volker%20Bahn/home.htm
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