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High-Resolution Pollen record from Core KW31, Gulf of Guinea, Documents the History of the Lowland Forests of West Equatorial Africa since 40,000 yr ago

Published online by Cambridge University Press:  20 January 2017

Anne-Marie Lezine  and
Jean-Pierre Cazet
Anne-Marie Lezine
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, UMR 1572 CNRS-CEA, Orme des Merisiers, 91191 Gif-sur-Y »vette, cedex, France
Jean-Pierre Cazet
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, UMR 1572 CNRS-CEA, Orme des Merisiers, 91191 Gif-sur-Y »vette, cedex, France
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Abstract

Pollen data from core KW31 recovered off the mouth of the Niger River (3°31′1N–05°34ʺ1E; 1181 m water depth) provide an exceptional record of vegetation changes in the West African lowlands between 40,000 and 3500 cal yr B.P. The highly diverse microflora testify for the permanency of rain and secondary forests in the Niger river catchment, at least as gallery formations along rivers, during the last glacial period when dry conditions occurred in relation to enhanced trade-wind circulation. The direct consequence of the post-glacial warming and the correlative increase in monsoon fluxes over West Africa was the increase in forest diversity and the expansion of rain and secondary forests on the nearby continent. Comparison between KW31 pollen record and continental pollen data from 5°S to 25°N allows the evaluation of migration rates of tropical forest populations throughout North West Africa at the beginning of the Holocene and the vegetation response to the shift toward aridity recorded widely at the end of the African Humid Period around 4000 cal yr B.P.

Keywords

Marine palynologyAfrican rain forestGulf of GuineaPalaeoenvironmentLate Quaternary
Type
Special issue articles
Information
Quaternary Research , Volume 64 , Issue 3 , November 2005 , pp. 432 - 443
Copyright
University of Washington

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References

A., Aubréville (1949). Contribution à la paléohistoire des forêts de l'Afrique tropicale.Société d'Edition Géographique Maritime et Coloniale,Paris.Google Scholar
Bard, E. (1988). Correction of accelerator mass spectrometry 14C ages measured in planktonic foraminifera: paleoceanographic implications. Paleoceanography 3, 6 635–645.CrossRefGoogle Scholar
Baumhauer, R., and Schulz, D. (1984). The Holocene lake of Seguedine, Kaouar, NE-Niger. Palaeoecology of Africa 16, 283–290.Google Scholar
Blunier, T., and Brook, E. (2001). Timing of millennial-scale climate change in Antarctica and Greenland during the last glacial period. Science 291, 109–112.CrossRefGoogle ScholarPubMed
Cour, P., and Duzer, D. (1976). Persistance d' un climat hyperaride au Sahara central et méridional au cours de l'Holocene. Revue de Géographie Physique et de Géologie Dynamique 18, 175–198.Google Scholar
DeMenocal, P., Ortiz, J., Guilderson, T., Adkins, J., Sarnthein, M., Baker, L., and Yarusinsky, M. (2000). Abrupt onset and termination of the African Humid Period: rapid climate responses to gradual insulation forcing. Quaternary Science Reviews 19, 347–361.CrossRefGoogle Scholar
Dupont, L.M. (1989). Palynology of the last 680,000 years of ODP Site 658 (off NW-Africa): fluctuations in paleowind systems.Leinen, M., Sarnthein, M. Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport. NATO ASI Series C282 Kluwer, 779–794.Google Scholar
Dupont, L.M., and Agwu, C.O.C. (1991). Environmental control of pollen grain distribution patterns in the Gulf of Guinea and offshore NW-Africa. Geologische Rundschau 80, 567–589.Google Scholar
Dupont, L.M., Jahns, S., Marret, F., and Ning, S. (2000). Vegetation change in Equatorial West Africa: time-slices for the last 150 ka. Palaeogeography, Palaeoclimatology, Palaeoecology 155, 95–122.CrossRefGoogle Scholar
Elenga, H., Vincens, A., and Schwartz, D. (1991). Présence d'éléments forestiers montagnards sur les Plateaux Batéké (Congo) au Pléistocène supérieur: nouvelles données palynologiques. Palaeoecology of Africa 21, 239–252.Google Scholar
Elenga, H., Schwartz, D., and Vincens, A. (1992). Changements climatiques et action anthropique sur le littoral congolais au cours de l'Holocène. Bulletin de la Société Géologique de France 163, 1 83–90.Google Scholar
Elenga, H., Schwartz, D., and Vincens, A. (1994). Pollen evidence of late Quaternary vegetation and inferred climate changes in Congo. Palaeogeography, Palaeoclimatology, Palaeoecology 109, 345–356.Google Scholar
Elenga, H., Schwartz, D., Vincens, A., Bertaux, J., de Namur, C., Martin, L., Wirrmann, D., and Servant, M. (1996). Diagramme pollinique Holocène du lac Kitina (Congo): mise en évidence de changements climatiques dans le massif forestier du Mayombe. Comptes-Rendus de l'Académie des Sciences, Paris 323, 403–410.Google Scholar
Farrera, I., Harrison, S.P., Prentice, I.C., Ramstein, G., Guiot, J., Bartlein, P.J., Bonnefille, R., Bush, M., Cramer, W., von Grafenstein, U., Holmgren, K., Hooghiemstra, H., Hope, G., Jolly, D., Lauritzen, S.-E., Ono, Y., Pinot, S., Stute, M., and Yu, G. (1999). Tropical climates at the last glacial maximum: a new synthesis of terrestrial palaeoclimate data. I. Vegetation, lake-levels and geochemistry. Climate Dynamics 15, 823–856.CrossRefGoogle Scholar
Fjeldsa, J., and Lovett, J.C. (1997). Geographical patterns of old and young species in African forest biota: the significance of specific montane areas as evolutionary centres. Biodiversity and Conservation 6, 3 325–346.Google Scholar
Giresse, P., Maley, J., and Brenac, P. (1994). Late Quaternary palaeoenvironments in the Lake Barombi Mbo (west Cameroon) deduced from pollen and carbon isotopes of organic matter. Palaeogeography, Palaeoclimatology, Palaeoecology 107, 65–78.CrossRefGoogle Scholar
Holmes, J.A., Allen, M.J., Street-Perrott, F.A., Ivanovich, M., Perrott, R.A., and Waller, M.P. (1999). Late Holocene palaeolimnlogy of Bal Lake, Northern Nigeria, a multidisciplinary study. Palaeogeography, Palaeoclimatology, Palaeoecology 148, 169–185.Google Scholar
Hooghiemstra, H. (1989). Variations of the NW African trande wind regime during the last 140,000 years: changes in pollen flux evidenced by marine sediment records.Leinen, M., Sarnthein, M. Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport Kluwer Academic Publisher, Dordrecht.733–770.Google Scholar
Hooghiemstra, H., and Agwu, C.O.C. (1988). Changes in the vegetation and trade winds in equatorial Northwest Africa 140,000–70,000 yr BP, as deduced from two marine pollen records. Palaeogeography, Palaeoclimatology, Palaeoecology 66, 173–213.Google Scholar
Hutchinson, J., and Dalziel, J.M. (1954–1972). )Flora of West Tropical Africa vols. 1–4, Whitefriars, London.Google Scholar
Kadomura, H., and Kiyonaga, J. (1994). Origin of grassfields landscape in the West Cameroon Highlands.Kadomoura, H. Savannization Processes in Tropical Africa II Tagelaqp/Sapita vol. 2, Tokyo Metropolitan University, Tokyo.47–85.Google Scholar
Keay, R.W.J. (1989). Nigerian Trees. Claredon Press, Oxford.Google Scholar
Kellman, M., Tackaberry, R., Brokaw, N., and Meave, J. (1994). Tropical gallery forests. National Geographic Research and Exploration 10, 92–103.Google Scholar
Lebrun, J.P., and Stork, A.L. (1991–1997). )Enumération des Plantes à fleurs d'Afrique Tropicale. Conservatoire et Jardins botaniques de la ville de Genève, Genève vols. 1–4, Google Scholar
Letouzey, R. (1968). Etude phytogéographique du Cameroun. P. Lechevalier, Paris.Google Scholar
Lézine, A.-M. (1988). Les variations de la couverture forestière mésophile d'Afrique occidentale au cours de l'Holocène. Comptes rendus de l'Académie des Sciences, Paris 307, 2 439–445.Google Scholar
Lézine, A.-M. (1989). Late Quaternary vegetation and climate of the Sahel. Quaternary Research 32, 317–334.Google Scholar
Lézine, A.-M. (1993). Chemchane, histoire d'une sebkha. Sécheresse 4, 25–30.Google Scholar
Lézine, A.-M., and Vergnaud-Grazzini, C. (1993). Evidence of forest extension in West Africa since 22,000 BP: a pollen record from the Eastern Tropical Atlantic. Quaternary Science Reviews 12, 203–210.Google Scholar
Lézine, A.-M., Tastet, J.P., and Leroux, M. (1994). Evidence of Atmospheric paleocirculation over the Gulf of Guinea since the Last Glacial Maximum. Quaternary Research 41, 390–395.Google Scholar
Lézine, A.-M., Duplessy, J.-C., and Cazet, J.-P. (2005). West African monsoon variability during the last deglaciation and the holocene: Evidence from fresh water algae, pollen and isotope data from Core KW31, Gulf of Guinea. Palaeogeography, Palaeoclimatology, Palaeoecology 219, 3–4 225–237.Google Scholar
Maley, J. (1981). Etudes palynologiques dans le bassin du Tchad et paléoclimatologie de l'Afrique nord-tropicale de 30 000 ans à l'époque actuelle. Orstom, Paris.Google Scholar
Maley, J. (1989). Late Quaternary climatic changes in the African rain forest: forest refugia and the major role of sea surface temperature variations.Leinen, M., Sarnthein, M. Paleoclimatology and Paleometeorology: Modern and past patterns of global atmospheric transport Nato ASI series vol. 282, 585–616.Google Scholar
Maley, J., and Brenac, P. (1998). Vegetation dynamics, palaeoenvironments and climatic change in the forests of western Cameroon during the last 28000 years BP. Revue of Palaeobotany and Palynology 99, 157–187.Google Scholar
Marchant, R., and Hooghiemstra, H. (2004). Rapid environmental change in African and South American tropics around 4000 years before present: a review. Earth-Science Reviews 66, 217–260.Google Scholar
Marret, F. (1994). Evolution paléoclimatique et paléohydrologique de l'Atlantique Est-Equatorial et du proche continent au Quaternaire terminal, contribution palynologique (kystes de dinoflagellés, pollen et spores).PhD thesis,University of Bordeaux, I, Google Scholar
Marret, F., Scourse, J.D., Versteegh, G., Jansen, J.H.F., and Schneider, R. (2001). Integrated marine and terrestrial evidence for abrupt Congo River palaeodischarge fluctuations during the last deglaciation. Journal of Quaternary Science 16, 8 761–766.Google Scholar
Pastouret, L., Chamley, H., Delibrias, G., Duplessy, J.-C., and Thiede, J. (1978). Late Quaternary climatic changes in Western Tropical Africa deduced from deep-sea sedimentation off the Niger delta. Oceanologica Acta 2, 217–232.Google Scholar
I., Reynaud-Farrera (1995). Histoire des paléoenvironnements forestiers du Sud-Cameroun à partir d'analyses palynologiques et statistiques de dépôts Holocènes et actuels.PhD thesis,University of Montpellier, II, .Google Scholar
Reynaud-Farrera, I., Maley, J., and Wirrmann, D. (1996). Végétation et climat dans les forêts du Sud-Ouest Cameroun depuis 4770 ans B.P.: analyse pollinique des sédiments du Lac Ossa. Comptes Rendus de l'Académie des Sciences, Paris 322, II 749–755.Google Scholar
Richards, K. (1986). Preliminary results of pollen analysis of a 6000 year core from Mboandong, a crater lake in Cameroun.Baker, R.G.E., Richards, K., Rimes, C.A. The Hull University Cameroun Expedition 1981–82 Final Report Misc. Ser. vol. 30, University of Hull, Department of Geography, 14–28.Google Scholar
Ritchie, J.C. (1995). Tansley review n°83: current trends in studies of long-term plant community dynamics. New Phytologist 130, 469–494.Google Scholar
Ritchie, J.C., and Haynes, C.V. (1987). Holocene vegetation zonation in the eastern Sahara. Nature 330, 645–647.CrossRefGoogle Scholar
Ritchie, J.C., Eyles, C.H., and Haynes, C.V. (1985). Sediment and pollen evidence for an early to mid-Holocene humid period in the eastern Sahara. Nature 314, 352–355.Google Scholar
Salzmann, U. (2000). Are modern savannas degraded forests? A Holocene pollen record from the sudanian vegetation zone of NE Nigeria. Vegetation History and Archaebotany 9, 1–15.CrossRefGoogle Scholar
Salzmann, U., and Waller, M. (1998). The Holocene vegetational history of the Nigerian Sahel based on multiple pollen profiles. Review of Palaeobotany and Palynology 100, 39–72.CrossRefGoogle Scholar
Schulz, E. (1991). The Taoudenni–Agorgott pollen record and the Holocene vegetation history of the central Sahara.Petit-Maire, N. Paléoenvironnements du Sahara. Lacs Holocènes à Taoudenni (Mali) Editions du CNRS, Paris.143–160.Google Scholar
Sowunmi, M.A. (1981). Aspects of Late Quaternary vegetational changes in West Africa. Journal of Biogeography 8, 457–474.Google Scholar
Street-Perrott, F.A., and Harrison, S. (1984). Temporal variations in lake levels since 30,000 yr B.P.–An index of the global hydrological cycle. Geophysical Monograph 29, 5 118–129.Google Scholar
Stuiver, M., Reimer, P.J., Bard, E., Beck, J.W., Burr, G.S., Hughen, K.A., Kromer, B., McCormac, G., van der Plicht, J., and Spurk, M. (1998). INTCAL98 radiocarbon age calibration, 24,000–0 cal BP. Radiocarbon 40, 1041–1083.Google Scholar
Talbot, M.R., and Johannessen, T. (1992). A high resolution paleoclimatic record for the last 27,500 years in Tropical West Africa from the carbon and nitrogen composition of lacustrine organic matter. Earth and Planetary Science Letters 110, 23–37.Google Scholar
Talbot, M.R., Livingstone, D.A., Palmer, P.G., Maley, J., Melack, J.M., Delibrias, G., and Guliksen, S. (1984). Preliminary results from sediment cores from Lake Bosumtwi, Ghana. Palaeoecology of Africa 16, 173–192.Google Scholar
Tamura, T. (1990). Late Quaternary landscape evolution in the West Cameroon Highlands and the Adamaoua Plateau.Lanfranchi, R., Schwartz, D. Paysages quaternaires de l'Afrique centrale atlantique Orstom, Paris.298–318.Google Scholar
Thiede, J., Pastouret, L., and Melguen, M. (1974). Sédimentation profonde au large du delta du Niger (Golfe de Guinée). Comptes Rendus de l'Académie des Sciences, Paris 278, 987–990.Google Scholar
Vincens, A., Schwartz, D., Bertaux, J., Elenga, H., and de Namur, C. (1998). Late Holocene climatic changes in western Equatorial Africa inferred from pollen lake Sinnda, Southern Congo. Quaternary Research 50, 34–45.Google Scholar
Vincens, A., Schwartz, D., Elenga, H., Reynaud-Farrera, I., Alexandre, A., Bertaux, J., Mariotti, A., Meunier, J.-D., Nguetsop, F., Servant, M., Servant-Vildary, S., and Wirrmann, D. (1999). Forest response to climate changes in Atlantic Equatorial Africa during the last 4000 years BP and inheritance on the modern landscapes. Journal of Biogeography 26, 879–885.Google Scholar
Walter, H., Harnickell, E., and Mueller-Dambois, D. (1975). Climate-Diagram Maps of the Individual Continents and the Ecological Climatic Regions of the Earth. Springer, Berlin.Vegetation monograph, supplementGoogle Scholar
Watrin, J. (2004). Relation pollen-plante-climat en Afrique sèche. Mémoire DEA, Université VI, 48 Google Scholar
White, F. (1986). La végétation de l'Afrique. Orstom - UNESCO, Paris.Google Scholar
White, F. (1993). Refuge theory, ice-age and the history of tropical biotas: an essay in plant-geography. Fragmenta Floristica et Geobotanica 2, 2 385–409.(suppl.)Google Scholar
Williamson, D. (1991). Propriétés magnétiques de séquences sédimentaires de Méditerranée et d'Afrique intertropicale.Implications environnementales et géomagnétiques pour la période 30–0 ka B.P. PhD thesis.University of Aix-Marseille, II, .Google Scholar
Zogning, A., Giresse, P., Maley, J., and Gadel, F. (1997). Late Holocene palaeoenvironment in the Lake Njupi area, west Cameroon: implications regarding the history of Lake Nyos. Journal of African Earth Sciences 24, 285–300.Google Scholar