Abstract
Holocene mangrove dynamics are reconstructed from pollen, sediment and radiocarbon analyses of three cores (ANR, BNR, CNR) located across a 20 km transect in the Rufiji Delta, Tanzania. At the base of the sediment sequence, dated to about 5600 cal. year b.p., the mangroves which are present suggest a low intertidal ecosystem in response to wet conditions and a higher sea level than at the present day. After around 5600 cal. year b.p. in core BNR, mangroves retreated seaward probably due to a lower sea level and drier environmental conditions. At around 4640 cal. year b.p., mangroves shifted landward suggesting a phase of sea level rise. In the late Holocene, mangroves became established at higher elevations of the Rufiji Delta, which is now a paddy field. Mangrove taxa decreased after 1170 cal. year b.p., suggesting drier conditions and less inundation frequency, possibly due to a lower sea level. Marked vegetation changes from mangroves to terrestrial vegetation occurred after around 750 cal. year b.p., possibly related to sea level regression and/or a desiccation phase recorded during the late Holocene. Paddy fields replaced mangroves in the landward part of the transect, reflecting an increase in human settlement in this area, a trend that continues to the present day. The recent decrease of mangrove species, particularly Rhizophora mucronata, could suggest less inundation by saline water and a lower sea level, although these changes may also be due to human activities during the last millennia as indicated by charcoal analysis.
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Acknowledgments
This work was carried out as a part of doctoral thesis at the University of York. Appreciation is expressed to William Kindeketa and Philip Lowe for their support and assistance throughout this fieldwork. I would like to thank Jason Rubens, Haji Machano, Frank Sima and WWF-Tanzania staff for helping me to get started, for their hospitality. The Global Environment Facility (GEF)’s support for the project, via a grant to WWF-Tanzania, is greatly appreciated. I would like to thank Benson Kimeu, Survey/GIS Technician from the British Institute in Eastern Africa (BIEA) for conducting the elevation survey through the Rufiji delta. I am grateful to the reviewers guiding me to interesting and invaluable discussions. This study was funded by The Royal Thai Government Scholarship and WWF-Tanzania. Finally, my deepest thanks to my supervisors, Rob Marchant and Katherine Selby, Environment Department, University of York, UK for their supervision, guidance and encouragement all the time.
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Punwong, P., Marchant, R. & Selby, K. Holocene mangrove dynamics and environmental change in the Rufiji Delta, Tanzania. Veget Hist Archaeobot 22, 381–396 (2013). https://doi.org/10.1007/s00334-012-0383-x
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DOI: https://doi.org/10.1007/s00334-012-0383-x