ABSTRACT
The recent 70% decline in deforestation in the Brazilian Amazon suggests that it is possible to manage the advance of a vast agricultural frontier. Enforcement of laws, interventions in soy and beef supply chains, restrictions on access to credit, and expansion of protected areas appear to have contributed to this decline, as did a decline in the demand for new deforestation. The supply chain interventions that fed into this deceleration are precariously dependent on corporate risk management, and public policies have relied excessively on punitive measures. Systems for delivering positive incentives for farmers to forgo deforestation have been designed but not fully implemented. Territorial approaches to deforestation have been effective and could consolidate progress in slowing deforestation while providing a framework for addressing other important dimensions of sustainable development.
Subject(s)
Conservation of Natural Resources/trends , Glycine max/supply & distribution , Meat/supply & distribution , Public Policy , Animals , Brazil , Cattle , HumansABSTRACT
O presente trabalho teve como objetivo evidenciar alterações morfológicas nas brânquias de Tilápia do Nilo (Oreochromis niloticus) da Represa Billings. Foram utilizados dez animais, sendo cinco provenientes da Represa Billings e cinco provenientes dos tanques comerciais da Royal Fish. Prepararam-se lâminas histológicas para análise morfométrica e quantitativa por meio do Índice de Alteração Histológica (I.A.H.). O I.A.H. apresentou diferença estatística significativa (p<0,05) entre os grupos, o que permitiu a conclusão de que os poluentes afetaram histologicamente as brânquias dos animais provenientes da Represa Billings e que esses animais estão parcialmente adaptados ao ambiente.(AU)
The aim of this study is to show morphological changes in the gills of Nile Tilapia (Oreochromis niloticus) at Billings Dam. Ten specimens were used, five of which came from the Billings Dam and five from Royal Fish commercial aquaculture tanks. Slides were prepared for morphometric and quantitative analysis of histological sections. There was a significant statistical difference (p<0.05) in the histological alteration index, which led us to conclude that pollutants are affecting Tilapia gills histologically and these animals are partially adapted to the environment.(AU)
Subject(s)
Animals , Cichlids/anatomy & histology , Gills/cytology , Biomarkers , Eutrophication , Water Pollution , DamsABSTRACT
O presente trabalho teve como objetivo evidenciar alterações morfológicas nas brânquias de Tilápia do Nilo (Oreochromis niloticus) da Represa Billings. Foram utilizados dez animais, sendo cinco provenientes da Represa Billings e cinco provenientes dos tanques comerciais da Royal Fish. Prepararam-se lâminas histológicas para análise morfométrica e quantitativa por meio do Índice de Alteração Histológica (I.A.H.). O I.A.H. apresentou diferença estatística significativa (p<0,05) entre os grupos, o que permitiu a conclusão de que os poluentes afetaram histologicamente as brânquias dos animais provenientes da Represa Billings e que esses animais estão parcialmente adaptados ao ambiente.
The aim of this study is to show morphological changes in the gills of Nile Tilapia (Oreochromis niloticus) at Billings Dam. Ten specimens were used, five of which came from the Billings Dam and five from Royal Fish commercial aquaculture tanks. Slides were prepared for morphometric and quantitative analysis of histological sections. There was a significant statistical difference (p<0.05) in the histological alteration index, which led us to conclude that pollutants are affecting Tilapia gills histologically and these animals are partially adapted to the environment.