Found 5 datasets
Datasets | Project Group | Resources |
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Aquatic community response in a groundwater-fed desert lake to Holocene desiccation of the Sahara doi Spatial
The finely laminated sediment record of a permanent, hypersaline, desert oasis lake in the Ounianga region of northeastern Chad presents a unique opportunity to document the hydrological evolution of this groundwater-fed aquatic ecosystem during mid- and late-Holocene desiccation of the Sahara. In this study we reconstruct long-term changes in zoobenthos and zooplankton communities of Lake Yoa as their early-Holocene freshwater habitat changed into the hypersaline conditions prevailing today. Chironomid...
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Response to Comment by Brovkin and Claussen on “Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years” doi
The Lake Yoa record and archaeological data provide adequate evidence that mid-Holocene
aridification did not occur abruptly across all of North Africa. Modeling results on the
issue of abrupt versus gradual desiccation of the Sahara are sufficiently diverse that paleoecological
data from a continuous natural archive can usefully guide the evaluation of model parameters
responsible for this diversity.
Keywords:
chad
lake yoa
mid-holocene
paleoecology
qunianga
sahara
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Sedimentation changes in a complete Holocene lacustrine record in the Sahara: Varve thickness, seasonality and event layers – Problems of identification, interpretation and chronology. Spatial
Lake Yoa (19.03°N, 20.31°E, 380 m a.s.l.) is a groundwater-fed lake in the hyperarid
eastern Sahara halfway between the Tibesti Mountains and the Ennedi plateau.
Kröpelin et al. (2008) revealed that the bottom sediments contain a unique archive of
climatic and environmental change in the Earth´s major desert. The 7.5 m sediment
record of OUNIK03/04 which covers 6,100 years has been extended to a maximum
drill depth of 15.7 m during a 2010 coring campaign within the framework of the
Collaborative...
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Seen in der Sahara doi
Große Wasserflächen inmitten der Wüste sind nicht nur ein Naturspektakel, sondern auch ein hochpräzises Umweltarchiv. Die aus ihnen gewonnenen Sedimente dokumentieren die Klimaentwicklung und geben Aufschluss über Staubstürme, Savannenbrände und Vulkanausbrüche.
Eine Reise in den Nordosten des Tschad.
Von Stefan Kröpelin
Keywords:
chad
geochemistry
lake sediments
qunianga
sahara
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Modern and early Holocene mollusc fauna of the Ounianga lakes (northern Chad): implications for the palaeohydrology of the central Sahara doi Spatial
The fresh and saline lakes of Ounianga Kebir and Serir in northeastern Chad are among the very few permanent aquatic
ecosystems currently existing in the hyper-arid core of the Sahara desert. The confirmed modern fauna of aquatic molluscs at
Ounianga comprises three widespread species (Melanoides tuberculata, Biomphalaria pfeifferi and Lymnaea natalensis), of which
only the first appears to maintain a thriving population. We recovered seven more species of gastropods, among which one is new to
science...
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