Publications des scientifiques de l'IRD

Ledru Marie-Pierre, Jomelli V., Bremond L., Ortuno T., Cruz P., Bentaleb I., Sylvestre Florence, Kuentz A., Beck S., Martin C., Pailles C., Subitani S. (2013). Evidence of moist niches in the Bolivian Andes during the mid-Holocene arid period. Holocene, 23 (11), p. 1547-1559. ISSN 0959-6836.

Titre du document
Evidence of moist niches in the Bolivian Andes during the mid-Holocene arid period
Année de publication
2013
Type de document
Article référencé dans le Web of Science WOS:000325689300004
Auteurs
Ledru Marie-Pierre, Jomelli V., Bremond L., Ortuno T., Cruz P., Bentaleb I., Sylvestre Florence, Kuentz A., Beck S., Martin C., Pailles C., Subitani S.
Source
Holocene, 2013, 23 (11), p. 1547-1559 ISSN 0959-6836
To examine the climate of the mid-Holocene and early human settings in the Andes when the Altiplano was recording the most arid phase of the Holocene, we analyzed plant-related proxies (pollen, phytoliths, diatoms, stable isotopes) from a sediment core sampled at high elevation in the Eastern Cordillera of Bolivia. Our study was carried out in the wetland of Tiquimani (16 degrees 1206.8S; 68 degrees 351.5W; 3760 m), on a well-known pathway between Amazonia and Altiplano. The 7000-year old record shows a two-step mid-Holocene with a dry climate between 6800 and 5800, followed by a wetter period that lasted until 3200 cal. yr BP. In the Central Andes of Bolivia, a widespread aridity was observed on the Altiplano during the mid-Holocene. However, here, we show that moisture was maintained locally by convective activity from the Amazon lowlands. During the arid interval between 5000 and 4000 yr BP, these niches of moisture produced specific grasslands that may have enabled the survival of an archaic culture of hunter-gatherers on the Puna. This development occurred 2000 years before expansion of quinoa cultivation on the Puna.
Plan de classement
Sciences du milieu [021] ; Géologie et formations superficielles [064]
Description Géographique
BOLIVIE ; ANDES
Localisation
Fonds IRD [F B010061208]
Identifiant IRD
fdi:010061208
Contact