Mass Energy and Flow in closed ecosystems

Ulanowicz, Robert (1972) Mass Energy and Flow in closed ecosystems. Journal of Theoretical Biology, 34, pp. 239-253.

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The general equations of biomass and energy transfer for an n-species, closed ecosystem are written. It is demonstrated how in "ecological time" the parameters describing the dynamics of biomass transfer are related to the parameters of energy transfer, such as respiration, fixation, and energy content. This relationship is determinate for the straight-chain ecosystem, and a simple example is worked out. The results show how the density dependent terms in population dynamics arise naturally, and how the stable system exhibits a hierarchy in energy per unit biomass. A procedure is proposed for extending the theory to include webbed systems, and the particular difficulties involved in the extension are brought before the scientific community for discussion.

Item Type: Article
Title: Mass Energy and Flow in closed ecosystems
Personal Creator/Author:
Ulanowicz, Robert
Refereed: Yes
Journal or Publication Title: Journal of Theoretical Biology
Volume: 34
Page Range: pp. 239-253
Date: 1972
ISSN: 0022-5193
Projects: UMCES-CBL
Issuing Agency: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
Additional Information: UMCES (University of Maryland Center for Environmental Science) Ref. No. 476
Uncontrolled Keywords: Models; energy flow; ecosystems
Subjects: Management
Item ID: 1980
Depositing User: Kathleen Heil
Date Deposited: 03 Apr 2009 00:07
Last Modified: 29 Sep 2011 19:51

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