Millennial-to-centennial scale lake system development in the mountains of tropical Mexico
Por:
Franco-Gaviria, Felipe, Correa-Metrio, Alex, Nunez-Useche, Fernando, Zawisza, Edyta, Caballero, Margarita, Prado, Blanca, Wojewodka, Marta, Olivares, Gustavo
Publicada:
1 abr 2020
Resumen:
Rapid degradation of freshwater ecosystems threatens water supply for
human populations and natural landscapes. At diverse time scales, this
process has been clearly associated with climatic and anthropogenic
forcings. The question remains, however, how tropical lakes have
responded to these two sources of variability. We present a multiproxy
record from Lake San Lorenzo, Lagunas de Montebello National Park,
tropical Mexico, spanning the last 3400 years. We used multi-elemental
concentrations, and Cladocera and pollen assemblages along the record to
reconstruct regional and local environmental variability, aiming to
infer the factors and processes involved in the evolution of the
lacustrine system. A principal component analysis on the pooled
biological and geochemical evidence allowed the inference of the main
changes in lake level and productivity. At millennial scales, the
development of the lake system has been closely associated with regional
moisture availability, with wetter (drier) time intervals associated
with high (low) lake stands. According to Ti concentrations, from 3400
to 1000 cal. a BP, regional conditions followed a trend towards drier
conditions, with littoral cladoceran assemblages suggesting high lake
productivity. The extreme regional droughts reportedly associated with
the cultural collapse of the Maya civilization manifested in our study
area through both high lake productivity and the lowest lake levels of
the record. Through the last 800 years, the regional moisture
availability has increased, with the water body becoming deeper and
larger. Overall, our record offers evidence of a highly variable system
strongly coupled with regional climates, but also very sensitive to
local disturbances associated with human occupation. Lake San Lorenzo
has been highly resilient to external pressures and has previously
recovered from conditions probably alike those associated with the
ongoing modern deterioration process. Nevertheless, such recovery
involves a complex network of interactions amongst natural and human
factors.
Filiaciones:
Franco-Gaviria, Felipe:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Tierra, Mexico City 04510, DF, Mexico
Univ Exeter, Dept Geog, Exeter EX4 4RJ, Devon, England
Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, Mexico
Department of Geography, University of Exeter, Exeter, EX4 4RJ, United Kingdom
Correa-Metrio, Alex:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Instituto de Geología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, Mexico
Nunez-Useche, Fernando:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Zawisza, Edyta:
Polish Acad Sci, Res Ctr Warsaw, Inst Geol Sci, Twarda 51-55, PL-00818 Warsaw, Poland
Research Centre in Warsaw, Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55, Warsaw, 00818, Poland
Caballero, Margarita:
Univ Nacl Autonoma Mexico, Inst Geofis, Mexico City 04510, DF, Mexico
Instituto de Geofísica, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, Mexico
Prado, Blanca:
Univ Nacl Autonoma Mexico, Inst Geol, Mexico City 04510, DF, Mexico
Instituto de Geología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, Mexico
Wojewodka, Marta:
Polish Acad Sci, Res Ctr Warsaw, Inst Geol Sci, Twarda 51-55, PL-00818 Warsaw, Poland
Research Centre in Warsaw, Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55, Warsaw, 00818, Poland
Olivares, Gustavo:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Mar & Limnol, Mexico City 04510, DF, Mexico
Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, 04510, Mexico
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