Please use this identifier to cite or link to this item:
DC FieldValueLanguage
dc.contributor.authorAnastácio, P. M.-
dc.contributor.authorNielsen, S. N.-
dc.contributor.authorMarques, J. C.-
dc.identifier.citationEcological Modelling. 123:1 (1999) 5-16en_US
dc.description.abstractAn ecological sub-model of crayfish (Procambarus clarkii) population dynamics is presented for integration into the CRISP (crayfish and rice integrated system of production) series of models. The present structure is directed towards simulation of crayfish population responses under different human interventions, namely different capture rates. The crayfish population was subdivided into seven age classes of 80 days, each one constituting a state variable. The increase in weight for each 80-day period was considered dependent on the temperature, the oxygen level and the water level. Mortality was assumed to be dependent on the dry weight of the crayfish and regulated by the total crayfish biomass. Food, water and oxygen content of the water were considered to be non limiting. Total crayfish biomass and total wet weight of crayfish captures were very sensitive to both the temperature for maximum growth and the mortality rates. Our most optimistic simulation, with a 50% decrease in the mortality rates, resulted in a fourfold increase in captures, from 230 to 917 kg ha-1 per year. Without capture, a value of 121 kg ha-1 was simulated for the average crayfish biomass, which is close to the 124 kg ha-1 obtained with crayfish capture. Our simulated average crayfish biomass was approximately 120 kg ha-1 in a natural situation, which lies inside the reported ranges from areas at approximately the same latitude.en_US
dc.subjectPopulation dynamicsen_US
dc.subjectIntegrated productionen_US
dc.titleCRISP (crayfish and rice integrated system of production): 2. Modelling crayfish (Procambarus clarkii) population dynamicsen_US
item.fulltextCom Texto completo- of Sciences and Technology- of Coimbra- - Marine and Environmental Sciences Centre-
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais
Files in This Item:
File Description SizeFormat
file91da2a18f91849b2a6c6ebef9c968001.pdf193.26 kBAdobe PDFView/Open
Show simple item record

Page view(s)

checked on May 4, 2021


checked on May 4, 2021

Google ScholarTM




Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.