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Pliocene large-mammal assemblages from Northern Chad: sampling and ecological structure
Emmanuel Fara1, Andossa Likius, Hassane T Mackaye
1Laboratoire de Géobiologie, Biochronologie, et Paléontologie humaine (UMR 6046 du CNRS), Université de Poitiers, 86022 Poitiers Cedex, France. efara@univ-poitiers.fr
Die Naturwissenschaften
|October 13, 2005
Summary
Pliocene mammal fossils in Chad reveal that environmental changes did not significantly alter paleo-community structures. Local habitat variations, not vegetation shifts, primarily shaped these ancient mammal ecosystems.
Area of Science:
- Paleontology
- Paleoecology
- Primate Evolution
Background:
- Pliocene large-mammal fossil assemblages from Chad offer insights into early hominid evolution in Central Africa.
- Understanding these assemblages requires assessing sampling and taxonomic homogeneity due to the lack of stratigraphic sections in the desert environment.
- Previous studies indicated environmental shifts towards C4 plants between 5.3 and 3.5-3 million years ago.
Purpose of the Study:
- To investigate the ecological structure of Pliocene mammal paleocommunities in Chad.
- To determine if environmental changes, specifically increased C4 plant abundance, impacted these paleocommunities.
- To analyze the influence of local environmental factors on mammal community composition.
Main Methods:
- Cluster analysis and ordination techniques were used to confirm the homogeneity of the three Pliocene Chadian fossil sectors.
- Body mass, trophic, and locomotor eco-variables were assigned to mammal species within the assemblages.
- Statistical analyses were performed to assess the relationship between environmental changes and community structure.
Main Results:
- The Pliocene mammal assemblages from Chad were confirmed as homogeneous and suitable for analysis.
- The overall ecological structure of the mammal paleocommunities showed no significant link to the increase in C4 plants.
- Eco-variables, including the diversity of grazing and browsing taxa, exhibited no clear temporal trend, suggesting local factors were dominant.
Conclusions:
- Despite environmental shifts, the ecological structure of Chadian mammal paleocommunities remained stable during the Pliocene.
- Local heterogeneous environmental factors, rather than broad vegetation changes, played a crucial role in shaping these ancient mammal communities.
- The findings suggest a complex interplay between environmental dynamics and faunal community structure in Pliocene Africa.