Climate forcings on vegetation of the southeastern Yucatán Peninsula (Mexico) during the middle to late Holocene
Periodo de realización: 1900/01/01 al 2018/06/01
Tipo: Artículo científico
Lugar(es) de estudio: Chetumal, Q.R., México
Resumen: "Climate and vegetation history from the Yucatán Peninsula, southeastern Mexico, are inferred from a mangrove sediment core deposited between the middle and late Holocene (~5600–1700?cal?yr?B.P.) in the Rio Hondo Delta. Fossil pollen and concentrations of Ca and Fe and Ca/Fe ratio in sediments are used to record changes in vegetation and climate. Palaeoecological and palaeoclimatic interpretations obtained from pollen abundances and associations and Fe/Ca ratio coincide with dynamics of major global forcings of climate change like ITCZ, ENSO and global cooling. Mesic conditions enabled tropical forest expansion during the middle Holocene (~5600–3650?cal?yr?B.P.), although there were periodic dry episodes at ~5200?cal?yr?B.P. and at ~4300?cal?yr?B.P. that caused disturbance and enabled herbaceous vegetation to expand. Changes in sedimentation and a gradual change from semi-evergreen to dry tropical forest occurred at ~3650?cal?yr?B.P., with increasing ENSO activity and southward migration of the ITCZ during transition of the middle to late Holocene. The driest period and lowest forest cover occurred between ~2600 and 2000?cal?yr?B.P. Data show that over the last two millennia, influence of the ENSO on southeastern Mexico is stronger compared to other proxy-records of climate variability from the Caribbean region."