Holocene precipitation changes in the Maya forest, Yucatán peninsula, Mexico
Vela Pelaez, Alejandro Antonio [autor] | Torrescano Valle, Nuria [autora] | Islebe, Gerald A [autor] | Mas, Jean François [autor] | Weissenberger, Holger [autor].
Tipo de material: Artículo en línea Tipo de contenido: Texto Tipo de medio: Computadora Tipo de portador: Recurso en líneaTema(s): Vegetación | Palinología | Cambio climático | PaleoecologíaTema(s) en inglés: Vegetation | Palynology | Climatic changes | PaleoecologyDescriptor(es) geográficos: Yucatán (Península) (México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Palaeogeography, Palaeoclimatology, Palaeoecology. Volumen 505 (September 2018), páginas 42-52. --ISSN: 0031-0182Número de sistema: 32343Resumen:Tipo de ítem | Biblioteca actual | Colección | Signatura | Estado | Fecha de vencimiento | Código de barras |
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Artículos | Biblioteca Electrónica Recursos en línea (RE) | ECOSUR | Recurso digital | ECO400323437642 |
Disponible para usuarios de ECOSUR con su clave de acceso
Holocene fossil pollen samples (n=38) from Lake Silvituc in Mexico were analyzed with the analog technique using modern pollen samples (n=98) of the Yucatán Peninsula, Mexico. Calculated dissimilarity indices allow us to reconstruct the vegetation and to develop a precipitation record for the last 7900 years. The Middle Holocene shows a gradual increase of precipitation and a marked drop in reconstructed precipitation around 4200 BCE. During the Late Holocene two phases were identified: Phase I (2500 BCE - 1 CE) shows the greatest increase in precipitation with four peaks around 1200 BCE, 650 BCE, 200 BCE and 1 CE. Also a period of increased precipitation resulted for the period between 200 and 500 BCE. Periods of reduced precipitation were detected at 900-1100 BCE, 500-600 BCE and 100-190 BCE. Phase II (1-2000 CE) encompasses several strong dry events during the following periods: 150-300 CE, 750-900 CE, 1050-1180 CE, and 1530-1580 CE. A strong reduction of 32% in precipitation in the late Preclassic Period (100-300 CE) was detected. Non-analogs of Phase II are associated with periods of reduced precipitation and fall into time periods of extended droughts related to the Maya Late Classic and the Little Ice Age. A limiting factor on the use of analogs for tropical forests is that a combination of different analogs for the same fossil pollen signal exists. Interpretation under these circumstances requires good knowledge of the ecology of the taxa and a priori characterization of the modern samples. eng