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This week

	 Dominique Wiest will be presenting

The stage-structured predatorprey model and optimal harvesting policy
	by
Xin-an Zhang, , a, b, c, Lansun Chen, b and Avidan U. Neumann, c

The URL's at the bottom, but in case that doesn't work, here is the
bibliographic info.  The journal can be found online  through the NatSci
library.

Mathematical Biosciences
Volume 168, Issue 2
December 2000
Pages 201-210


Abstract

In this paper, we establish a mathematical model of two species with stage
structure and the relation of predatorprey, to obtain the necessary and
sufficient condition for the permanence of two species and the extinction
of one species or two species. We also obtain the optimal harvesting
policy and the threshold of the harvesting for sustainable development.




http://www.sciencedirect.com/web-editions?_ob=ArticleURL&_udi=B6VHX-41S4T34-6&_user=450576&_coverDate=12%2F31%2F2000&_rdoc=6&_fmt=summary&_orig=browse&_srch=%23toc%236078%232000%23998319997%23218714!&_cdi=6078&_sort=d&_acct=C000021514&_version=1&_urlVersion=0&_userid=450576&md5=34a4cf063b318ab5c625185fc644385a