Paloenvironmental reconstruction using "delta c thirteen" and elemental analyses of a 700 year guano core from Cueva de los Guácharos, Colombia
Oilbird Guano sediment cores represent novel archives to reconstruct past terrestrial environments. "delta c thirteen" stable carbon isotope data, as well as carbon and nitrogen concentrations measured of a sediment core from the Cueva de los Guácharos (Huila, Colombia), enable us to appro...
- Autores:
-
Martínez Medina, Nathalie Melissa
- Tipo de recurso:
- Trabajo de grado de pregrado
- Fecha de publicación:
- 2018
- Institución:
- Universidad de los Andes
- Repositorio:
- Séneca: repositorio Uniandes
- Idioma:
- eng
- OAI Identifier:
- oai:repositorio.uniandes.edu.co:1992/39827
- Acceso en línea:
- http://hdl.handle.net/1992/39827
- Palabra clave:
- Paleoclimatología
Guácharos
Guano
Ecología de cuevas
Geociencias
- Rights
- openAccess
- License
- http://creativecommons.org/licenses/by-nc-sa/4.0/
| Summary: | Oilbird Guano sediment cores represent novel archives to reconstruct past terrestrial environments. "delta c thirteen" stable carbon isotope data, as well as carbon and nitrogen concentrations measured of a sediment core from the Cueva de los Guácharos (Huila, Colombia), enable us to approach to the precipitation regime of the past 700 years by disentangling the oilbirds (Steatornis caripensis) population dynamics in relation to its dietary preferences (Lauraceae and Arecaceae) as well as carbon and nitrogen fluxes. Methodological considerations and calcium variability were addressed by the comparison of two independent analytical methods (X-ray fluorescence vs. and elemental analyzer). Distinct d13C values within the C3 carbon metabolic pathway are proposed for Lauraceae (-28.5%) and Aracaceae (-29.6%). A positive correlation between "delta c thirteen" values and precipitation was inferred based on Lauraceae fructification seasonality coupled with the oilbirds reproductive period and peak guano deposition into the cave. Comparison of reconstructed paleoprecipitations of Cariaco basin (Venezuela), El Peñon (Santander) and Ubaque (Cundinamarca) demonstrate that the LIA and the CWP were significant drier climate anomalies in the region, dominated by distinct processes, the southward excursion of the ITCZ and establishment of El Niño conditions, respectively. Variations in the guano record suggest local climatic processes due to its proximity to The Amazonia |
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