Tracking long-term human impacts on landscape, vegetal biodiversity and water quality in the Lake Aydat catchment (Auvergne, France) using pollen, non-pollen palynomorphs and diatom assemblages
Yannick Miras|Aude Beauger|Marlène Lavrieux|Vincent Berthon|Karen K. Serieyssol|Valérie Andrieu‐Ponel|Paul M. Ledger
Palaeoenvironmental studies allow the assessment of long-term human–climate–environmental interactions, and furnish valuable tools for sustainable management lacustrine ecosystems. A good example is multi-proxy study Lake Aydat's 19 m sedimentary core. Previous research revealed role climate human activities on lake sedimentation, identified two units (6700 ± 200 to 3180 90 1770 60 cal. yr BP present) separated by an erosive mass-wasting deposit (Lavrieux et al., 2013a). Pollen, non-pollen palynomorphs (e.g. fungal algal spores, rotifer resting eggs), diatom-based trophic reconstructions have been used track impacts past land use landscape evolution, vegetal biodiversity water quality. data were also compared with local archaeo-historical datasets which allowed refined reconstructions, especially late Antiquity. The results obtained demonstrate that even Neolithic Bronze Age (between ca. 4600 4300 between 3900 3500 BP) had a discernible influence catchment vegetation dynamics Aydat, underlining vulnerability ecosystem. Recurrent complex models changes, phases nutrient over-enrichment resilience related grazing activities, but practises, overlooked in Auvergne, such as mountain agriculture hemp retting.
Palaeogeography, Palaeoclimatology, Palaeoecology|HAL (Le Centre pour la Communication Scientifique Directe)|HAL (Le Centre pour la Communication Scientifique Directe)