Assessment of environmental management effects in a shallow water basin using mass-balance models

摘要: Abstract Comparative analysis of trophic networks was carried out to evaluate environmental management actions aimed at countering an crisis in Orbetello Lagoon, Italy. Two mass-balance models this shallow water coastal system were constructed, for 1995 and 1996. During period, there observed change the composition submerged vegetation that indicated a significant improvement lagoon’s ecology. Mass-balance built using Ecopath modelling software order explain energy transfer through levels (TLs) ecosystem. two allowed complete description lagoon, gave clear indications regarding ‘eutrophication level’ sensu Nixon stage maturity Odum ecosystem 2 years. The turnover rate (production/biomass ratio) pleustophytes proposed as indicator “environmental health” level because it allows positioning whole along axis adaptation strategies natural selection. All indices stability examined showed lagoon more stable condition 1996 than 1995, although still stress. effects quantified by estimating changes primary production accumulation detritus system. Management extensive aquaculture operation assessed analysing fishery catch, efficiencies different impact cormorants, found contribute stability.