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The idea for this book was born at the June 1996 meeting of the
IDEAL Steering Committee in Milwaukee, Wisconsin. We had just
completed a successful and stimulating special symposium during the
annual meeting of the American Society for Limnology and
Oceanography, and enthusiasm was running high for the production of
a volume that could assemble in one place the scientific findings
that were starting to emerge from East Africa. IDEAL, an
International Decade for the East African Lakes, had ended one
round of field investigations, many of which had been centered on
Lake Victoria. As the climatologists, geologists,
paleolimnologists, and biologists displayed their results and
debated interpretations, it appeared that some paradigms were
shifting, and that new explanations of climate history and modem
processes were taking shape. The Steering Committee endorsed the
production of a volume that would draw together the different
research results that were emerging and which would be
representative of the scope of science issues that exist within
IDEAL. This book follows in the spirit of The Limnology,
Climatology, and Paleoclimatology of the East African Lakes,
published in 1996, but has a somewhat different purpose. The
previous publication also included original science results, but it
was conceived to review the state of knowledge, identify critical
problems, and point to new paths of inquiry. It accompanied the
development of our first Science and Implementation Plan for the
East African Lakes.
The International Decade for the East African Lakes (IDEAL) has
completed its first phase of field studies, and has assembled in
this volume its findings, ranging from seismic reflections to
historical drought chronologies, geochemistry, and modern food web
processes. Multidisciplinary IDEAL investigations are summarized
and integrated, revealing that modern changes in the East African
lakes share a continuity with past variations in climate and
environmental conditions. Results from an array of disciplinary
perspectives and evidentiary lines point to the causative role of
modern climate variation in the deterioration of Lake Victoria, one
of the most prominent lakes on the planet. The ancient conditions
of Victoria and other East African lakes are reconstructed with
forensic tools that permit measurements of paleomagnetism, pollen
and algal fossils, biogenic minerals, depositional carbonates, and
bulk geochemistry. Oral traditions, explorer's journals, and
records of the ancient Nile provide human testimonies that parallel
the physical record. Studies of biological production, nutrient
dynamics, and lower food web processes reveal how the lake
communities function at the trophic levels that leave sedimentary
evidence in the form of organic matter, minerals, and fossils.
Comparisons of weather records and lake properties demonstrate a
striking change in climate conditions during the present century
with causal links to lake conditions. The collected scientific
perspective makes a compelling case for the worth of integrated
studies across a spectrum of traditional specialties when they are
focused on complex environmental issues.
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