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Titolo:
Optimization of exergy and implications of body sizes of phytoplankton andzooplankton in an aquatic ecosystem model
Autore:
Ray, S; Berec, L; Straskraba, M; Jorgensen, SE;
Indirizzi:
Acad Sci Czech Republ, Inst Entomol, Dept Theoret Biol, CR-37005 Ceske Budejovice, Czech Republic Acad Sci Czech Republ Ceske Budejovice Czech Republic CR-37005 Republic Univ S Bohemia, Fac Biol Sci, Ceske Budejovice 37005, Czech Republic Univ S Bohemia Ceske Budejovice Czech Republic 37005 005, Czech Republic
Titolo Testata:
ECOLOGICAL MODELLING
fascicolo: 3, volume: 140, anno: 2001,
pagine: 219 - 234
SICI:
0304-3800(20010615)140:3<219:OOEAIO>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLANKTON COMMUNITY; MARINE PHYTOPLANKTON; THEORETICAL-ANALYSIS; NATURAL-WATERS; GROWTH-RATES; ALGAL CELLS; LARGE LAKE; RESPIRATION; PHOTOSYNTHESIS; TEMPERATURE;
Keywords:
phosphorus; phytoplankton; zooplankton; fish; body size; exergy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
70
Recensione:
Indirizzi per estratti:
Indirizzo: Jorgensen, SE DFH, Inst A, Univ Pk 2, DK-2100 Copenhagen O, Denmark DFH Univ Pk 2 Copenhagen Denmark O 00 Copenhagen O, Denmark
Citazione:
S. Ray et al., "Optimization of exergy and implications of body sizes of phytoplankton andzooplankton in an aquatic ecosystem model", ECOL MODEL, 140(3), 2001, pp. 219-234

Abstract

Size appears to be an important parameter in ecological processes. All physiological processes vary with body size ranging from small microorganisms to higher mammals. In this model, five state variables - phosphorus, detritus, phytoplankton, zooplankton and fish are considered. We study the implications of body sizes of phytoplankton and zooplankton for total system dynamics by optimizing exergy as a goal function for system performance indicator. The rates of different sub-processes of phytoplankton and zooplankton are calculated, by means of allometric relationships of their body sizes. Werun the model with different combinations of body sizes of phytoplankton and zooplankton and observe the overall biomass of phytoplankton, zooplankton and fish. The highest exergy values in different combinations of phytoplankton acid zooplankton size indicate the maximum biomass of fish with relative proportions of phytoplankton and zooplankton. We also test the effect of phosphorus input conditions corresponding to oligotrophic, mesotrophic, eutrophic system on its dynamics. The average exergy to be maximized over phytoplankton and zooplankton size was computed when the system reached a steady state. Since this state is often a limit cycle, and the exergy copies this behaviour, we averaged the exergy computed for 365 days (duration of 1 year) in the stable period of the run. In mesotrophic condition, maximum fish biomass with relative proportional ratio of phytoplankton, zooplankton is recorded for phytoplankton size class 3.12 (log V mum(3) volume) and zooplankton size 4 (log V mum(3) volume). In oligotrophic condition the highestaverage exergy is obtained in between phytoplankton size 1.48 (log V mum(3) volume) and zooplankton size 4 (log V mum(3) volume), whereas in eutrophic condition the result shows the highest exergy in the combination of phytoplankton size 5.25 (log V mum(3) volume) and zooplankton size 4 (log V mum(3) volume). (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 22:45:11