Drivers of Ecosystem Dynamics in West Africa over the last c. 500.000 Years by William Gosling

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Date(s) - 14/01/2019
5:00 pm - 6:00 pm

HS VI Main Building UoC


by Prof. Dr. William Gosling
from Department of Ecosystem & Landscape Dynamics, University of Amsterdam

Over the last half million years global climate systems have undergone significant reorganisation, largely due to changes in the Earths orbital configuration, which has resulted in significant modification of ecosystems. The reconfiguration of climate systems has resulted in changes in temperature and precipitation patterns across the globe. At high and mid-latitudes the impact of these climate changes on ecosystems is predominantly driven by the expansion and contraction of ice-sheets. However, at low latitudes the impact of global climate cycles on ecosystems is less well understood, in part due to a paucity of suitable study sites. Lake Bosumtwi (Ghana, 6oN) was formed around one million years ago when a meteorite hit the Earth. The sedimentary record that has since accumulated within Lake Bosumtwi provides a rare opportunity to explore past ecosystem dynamics in a lowland tropical setting. Here I present evidence obtained from the Lake Bosumtwi sediments, and link it with other datasets, to explore the role of fire, herbivores, CO2, temperature, precipitation, and seasonality in driving ecosystem dynamics (vegetation composition and diversity) around the crater over the last c. 500,000 years.