|
|
|
|
|
| ROZON,Christine; LUCOTTE,Marc; DAVIDSON,Robert; PAQUET,Serge; OESTREICHER,Jordan Sky; MERTENS,Frédéric; PASSOS,Carlos José SOUSA; ROMANA,Christine. |
| Pressures on the Brazilian Amazon forest have been accentuated by agricultural activities practiced by families encouraged to settle in this region in the 1970s by the colonization program of the government. The aims of this study were to analyze the temporal and spatial evolution of land cover and land use (LCLU) in the lower Tapajós region, in the state of Pará. We contrast 11 watersheds that are generally representative of the colonization dynamics in the region. For this purpose, Landsat satellite images from three different years, 1986, 2001, and 2009, were analyzed with Geographic Information Systems. Individual images were subject to an unsupervised classification using the Maximum Likelihood Classification algorithm available on GRASS. The classes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Deforestation; Watershed scale; Landsat Satellite Images; Cities; Roads. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000200203 |
| |
|
|
| SOUMIS,Nicolas; ROULET,Marc; LUCOTTE,Marc. |
| Many potentially harmful pesticides for both human health and the environment are used in Brazilian Amazon. However, no scientific datum on pesticide usage is presently available for this region. Consequently, it is difficult to assess which substances arc used and in which quantities. As an important premise for future work on pesticide contamination in the county of Santarém (State of Pará, Brazil), a survey was conducted in order to qualify and quantify the use of some pesticides in this region. This investigation was made between January and March 1997 and August and October 1998 and revealed use of several organophosphates, synthetic pyrethroids and carbamates insecticides. Furthermore, many herbicides and fungicides were listed. These pesticides are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon; Pesticides; Consumption; Utilization. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672000000400615 |
| |
|
|
| SOUMIS,Nicolas; LUCOTTE,Marc; SAMPAIO,Delaine; ALMEIDA,Diane C.; GIROUX,Dalie; MORAIS,Silmara; PICHET,Pierre. |
| Trace levels of three organophosphate insecticides (OPI) were detected in eight fish species from the region of Santarém, State of Pará, Brazil. Individual concentrations of OPI in fish ranged from less than the detection limit to 2,1 ppb. Mean concentrations of chlorpyrifos, malathion, and methyl-parathion were 0,3 ± 0,3, 0,1 ± 0,1, and 0,3 ± 0,3 ppb, respectively. Pellona flavipinnis, the largest and fattest piscivorous species analyzed, was the most contaminated. Since an inhabitant of this Amazonian region consumes 220 g of fish per day on average, ingested doses of chlorpyrifos, malathion, and methyl-parathion may reach up to 308, 220, and 462 ng·d-1, respectively. Compared to acceptable daily intakes (ADI), quantities of OPI absorbed via fish... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian Amazon; Fish contamination; Organophosphate insecticides; Acceptable daily intake (ADI); Human alimentation. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000200325 |
| |
|
|
|
