Manioc : Portail | resultats 21 - 32 pour la recherche: Cyperaceae

29. TRILEPIS Lhotokyana.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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21. LAGENOCARPUS Martii.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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12. EPHIPPIORHYNCHIUM polycephalum.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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1. DICLIDIUM Maximiliani.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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20. LAGENOCARPUS adamantinus
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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24. MACROLOMIA bracteata.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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15. NEMOCHLOA sparfiflora.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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Carex bermudiana
Auteur(s) : Zona, Scott

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4. I. HEMICARPHA subsquarrosa., II. PLATYLEPIS brasiliensis
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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8. I. SPERMODON setaceus., II. PTILOCHAETA diodon.
Auteur(s) : Martius, Karl Friedrich Philipp von (1794-1868)
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High-resolution vegetation history of West Africa during the last 145 ka
Auteur(s) : Dalibard, Mathieu Popescu, Speranta-maria Maley, Jean Baudin, Francois Melinte-dobrinescu, Mihaela-carmen Pittet, Bernard Marsset, Tania Dennielou, Bernard

Éditeur(s) : Elsevier France-editions Scientifiques Medicales Elsevier
Résumé : The essential characteristics of the vegetation dynamics of tropical Africa remain only partially known. This study assesses the succession of vegetation-types over Central Africa during the last two glacial/interglacial cycles. Analysis of core KZai 02, which contains pollen from the Zaire River watershed (latitudes 9°N-13°S), allows the investigation of long-term patterns of plant ecosystem development and their climatic causes. Core KZai 02 (18.20 m long) was recovered from 6°24.20′S/9°54.10′E in the uppermost axial edifice of the Zaire deep sea fan. The chronology of this sedimentary archive was established using nannofossils and correlations of pollen and total organic carbon signals with the nearby core GeoB1008. The pollen record indicates that: (i) glacials (MIS 6, 4, 2) are marked by the development of afromontane (Podocarpus) forest at high altitudes when central basin lowlands were occupied by Cyperaceae marshes and savannah; (ii) during interglacials (MIS 1, 5) lowland forests were developed, marked by the successive expansion of pioneer, warm-temperate, rain forests, and mangrove indicating sea-level rise; (iii) glacial-interglacial transitions (MIS 6/5, 2/1) display similar vegetation dynamics. The strong evidence of afromontane forest and the opening of the vegetation during glacials suggest a reduced latitudinal distribution of rainfall by the strengthening of the trade wind system. West African monsoon systems were enhanced during interglacials, allowing the progressive development of lowland forests. The development of rain and pioneer forests during glacial Heinrich stadials suggests an enhancement of water availability in tropical Africa associated with these high latitude events. However, no augmentation of wind activity, described by previous studies, is evidenced by our pollen record. Similar vegetation successions during glacial/interglacial transitions suggest the diachronous and stepped intervention of CO2 (emphasizing the influence of temperature on plant ecosystems) and water availability.
Geobios (0016-6995) (Elsevier France-editions Scientifiques Medicales Elsevier), 2014-07 , Vol. 47 , N. 4 , P. 183-198

Droits : 2014 Elsevier Masson SAS. All rights reserved.
http://archimer.ifremer.fr/doc/00199/31031/29436.pdf
DOI:10.1016/j.geobios.2014.06.002
http://archimer.ifremer.fr/doc/00199/31031/

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Phytolith signal of aquatic plants and soils in Chad, Central Africa
Auteur(s) : Novello, Alice BARBONI, Doris Berti-Équille, Laure Mazur, Jean-Charles Poilecot, Pierre Vignaud, Patrick
Auteurs secondaires : Institut International de Paléoprimatologie, Paléontologie Humaine : Evolution et Paléoenvironnement (IPHEP) ; Centre National de la Recherche Scientifique (CNRS) - Université de Poitiers Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Collège de France (CdF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) Département Environnement et Ressources [Montpellier] (ESPACE-DEV) ; Université des Antilles et de la Guyane (UAG) - Université de la Réunion (UR) - Université de Montpellier (UM) Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD)

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