8 documents found, page 1 of 1
Stability of a Neotropical microrefugiumduring climatic instability
Montade, Vincent; Ledru, Marie-Pierre; Burte, Julien; Martins, Eduardo Savio Passos Rodrigues; Verola, Christiano Franco; Costa, Itayguara Ribeiro daThe primary objectives of this study were (1) to assess, in the light of palaeoecological reconstruction, the climate stability hypothesis used by evolu-tionary biologists to explain high diversity in historically stable areas, and (2)to identify the response mechanisms of a tropical rain forest microrefugium toclimatic variability. Location North-eastern Brazil, Serra de Maranguape. Methods Vegetation and clim...
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...
The ACER pollen and charcoal database: a global resource to document vegetation...
Goni, Maria F. Sanchez; Desprat, Stephanie; Daniau, Anne-Laure; Bassinot, Frank C.; Polanco-Martinez, Josue M.; Harrison, Sandy P.; Allen, Judy R. M.Quaternary records provide an opportunity to examine the nature of the vegetation and fire responses to rapid past climate changes comparable in velocity and magnitude to those expected in the 21st-century. The best documented examples of rapid climate change in the past are the warming events associated with the Dansgaard-Oeschger (D-O) cycles during the last glacial period, which were sufficiently large to ha...
Late-glacial cooling in Amazonia inferred from pollen at Lagoa do Caco, norther...
Ledru, Marie-Pierre; Cordeiro, Renato Campello; Dominguez, José Maria Landim; Martin, Louis; Mourguiart, Philippe; Sifeddine, Abdelfetah; Turcq, BrunoTexto completo: acesso restrito. p.47–56; Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-01-10T13:05:08Z No. of bitstreams: 1 Ledru.pdf: 288799 bytes, checksum: 6a5507cad5ed7f79f8f01697579a5101 (MD5); Made available in DSpace on 2013-01-10T13:05:08Z (GMT). No. of bitstreams: 1 Ledru.pdf: 288799 bytes, checksum: 6a5507cad5ed7f79f8f01697579a5101 (MD5) Previous issue date: 2001; New pollen data from ...
Interdisciplinary paleovegetation study in the Fernando de Noronha Island (Pern...
Pessenda, Luiz Carlos Ruiz; Gouveia, Susy Eli Marques; Ledru, Marie-Pierre; Ramon, Aravena; Branco, Fresia Soledad Ricardi TorresThe aim of this research was to reconstruct vegetation changes (with climate inferences) that occurred during the Holocene in the Fernando de Noronha Island, Pernambuco State, northeastern Brazil. The research approach included the use of geochemical (mineralogy, elemental), carbon isotopes (δ13C, 14C) and pollen analyses in soil organic matter (SOM) and sediments collected in Lagoa da Viração and Manguezal do ...
A 21 000 cal years paleoclimatic record from Caçó Lake, northern Brazil: eviden...
Sifeddine, Abdelfettah; Albuquerque, Ana Luiza Spadano; Ledru, Marie-Pierre; Martin, Louis; Dominguez, José Maria LandimTexto completo: acesso restrito. p.25-34; Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2012-12-10T17:15:00Z No. of bitstreams: 1 1-s2.0-S0031018202005916-main.pdf: 507516 bytes, checksum: 6ccb7a21b80ab991841e6c2b4d360a93 (MD5); Made available in DSpace on 2012-12-10T17:15:00Z (GMT). No. of bitstreams: 1 1-s2.0-S0031018202005916-main.pdf: 507516 bytes, checksum: 6ccb7a21b80ab991841e6c2b4d360a93 (MD5) ...