Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Coffinet S., Huguet A., Bergonzini L., Pedentchouk N., Williamson David, Anquetil C., Galka M., Kolaczek P., Karpinska-Kolaczek M., Majule A., Laggoun-Defarge F., Wagner T., Derenne S. (2018). Impact of climate change on the ecology of the Kyambangunguru crater marsh in southwestern Tanzania during the Late Holocene. Quaternary Science Reviews, 196, 100-117. ISSN 0277-3791

Accès réservé (Intranet IRD) Demander le PDF

Lien direct chez l'éditeur doi:10.1016/j.quascirev.2018.07.038

Titre
Impact of climate change on the ecology of the Kyambangunguru crater marsh in southwestern Tanzania during the Late Holocene
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000445168300006
AuteursCoffinet S., Huguet A., Bergonzini L., Pedentchouk N., Williamson David, Anquetil C., Galka M., Kolaczek P., Karpinska-Kolaczek M., Majule A., Laggoun-Defarge F., Wagner T., Derenne S.
SourceQuaternary Science Reviews, 2018, 196, p. 100-117. ISSN 0277-3791
RésuméInstrumental records of temperature and hydrological regimes in East Africa evidence frequent droughts with dramatic effects on population and ecosystems. Sources of these climatic variations remain largely unconstrained, partly because of a paucity of Late Holocene records. Here, we present a multi-proxy analysis of a 4-m continuous sediment core collected in the Kyambangunguru crater marsh, in southwest Tanzania, covering the last 4000 yrs (cal. BP). We used microscopic (macro-remains, microfossils, palynofacies, pollen), elemental (carbon, nitrogen contents), molecular (br GDGTs, n-alkanes) and compound-specific isotopic (delta H-2 n-alkanes) investigations to reconstruct the environmental history of the marsh. The multi proxy record reveals that, 2500 years ago, the marsh underwent a major ecological transition from a lake to a peatland. Temperature and hydrological reconstructions evidence warmer and drier conditions between 2200 and 860 cal. BP, which probably triggered the establishment of a perennial peatland. This study is one of the first combined temperature and precipitation record of Late Holocene in the region and highlights changes in the spatial distribution of the East African climate regimes. Several cold periods are observed, between 3300 and 2000 cal. BP and since 630 cal. BP, the latter corresponding to the Little Ice Age. Moreover, wetter conditions are reported during the Medieval Climate Anomaly in contrast to other north-eastern African records suggesting that Tanzania is located at the transition between two hydro-climatic zones (north-eastern versus southern Africa) and has experienced variable contributions of these two zones over the last millennium.
Plan de classementEtudes, transformation, conservation du milieu naturel [082] ; Sciences du milieu [021] ; Géologie et formations superficielles [064]
Descr. géo.TANZANIE ; KYAMBANGUNGURU
LocalisationFonds IRD [F B010074068]
Identifiant IRDfdi:010074068
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010074068

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito