5 documents found, page 1 of 1
Phytoliths from soil surfaces and water reservoirs of the Brazilian semi-arid C...
Barroso, Francisco Rony Gomes; Gomes, Vaneicia dos Santos; Carvalho, Carlos Eduardo; Ledru, Marie Pierre; Favier, Charly; Araújo, Francisca SoaresUnderstanding processes that explain phytolith assemblages and their concentration in the soil and sediments is essential to interpret long-term ecological changes. The present study shows modern phytolith assemblages and their relationship with the vegetation cover in the Caatinga biome, state of Cear ́a, northeastern Brazil. We collected recent samples from soil surfaces, in 2015, in three different vegetatio...
When archives are missing, deciphering the effects of public policies and clima...
Ledru, Marie-Pierre; Pieruschka, Vivian Jeske; Bremond, Laurent; Develle, Anne-Lise; Sabatier, Pierre; Martins, Eduardo Sávio Passos RodriguesThe northeastern region of Brazil is the most densely populated and biodiverse semi-arid regions of the planet. Effects of the natural climate variability and colonization on the landscape have been described since the beginning of the 16th century but little is known about their effects on natural resources. Climate projections predict temperatures above 40 °C and an increase in the number and duration of drou...
Pollen-based characterization of montane forest types in north-eastern Brazil
Montade, Vincent; Diogo, Ivan Jeferson Sampaio; Bremond, Laurent; Favier, Charly; Costa, Itayguara Ribeiro da; Ledru, Marie-Pierre; Paradis, LaureSurface soil samples were collected in three mountainous massifs in north-eastern Brazil to characterize the different vegetation types according to their respective pollen assemblages. Complementary approach between pollen and vegetation data shows that the pollen rain accurately reflects the following three main forest types: i) a dense ombrophilous forest (or tropical moist broadleaf forest) characterized by...
Pollen-based characterization of montane forest types in north-eastern Brazil
Montade, Vincent; Diogo, Ivan Jeferson Sampaio; Bremond, Laurent; Favier, Charly; Costa, Itayguara Ribeiro da; Ledru, Marie-Pierre; Paradis, LaureSurface soil samples were collected in three mountainous massifs in north-eastern Brazil to characterize the different vegetation types according to their respective pollen assemblages. Complementary approach between pollen and vegetation data shows that the pollen rain accurately reflects the following three main forest types: i) a dense ombrophilous forest (or tropical moist broadleaf forest) characterized by...
Quantification of climate change for the last 20,000 years from Wonderkrater, S...
Truc, Loïc; Chevalier, Manuel; Favier, Charly; Cheddadi, Rachid; Meadows, Michael E.; Scott, Louis; Carr, Andrew S.; Smith, Gideon F.; Chase, Brian M.In southeast Africa – a region for which few palaeoenvironmental records are available – the fossil pollen record from the Wonderkrater spring mound has contributed substantially to our understanding of past vegetation change since the Last Glacial Maximum (LGM; 21 ka). Multivariate analysis of the pollen data by Scott and Thackeray (1987) provided environmental reconstructions suggesting relatively mesic LGM c...