2024-03-29T08:39:50Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/283232018-07-16T10:49:37Zcom_10261_24com_10261_8col_10261_277
DIGITAL.CSIC
author
Rull, Valentí
author
Abbott, Mark B.
author
Pratigya, J. Polissar
author
Wolfe, Alexander P.
author
Bezada, Maximiliano
author
Bradley, Raymond S.
2010-10-08T10:32:28Z
2010-10-08T10:32:28Z
2005
Quaternary Research 64: 308 – 317 (2005)
0033-5894
http://hdl.handle.net/10261/28323
10.1016/j.yqres.2005.08.014
[EN] Pollen analysis of sediments from a high-altitude (4215 m), Neotropical (9-N) Andean lake was conducted in order to reconstruct local and
regional vegetation dynamics since deglaciation. Although deglaciation commenced 15,500 cal yr B.P., the area around the Laguna Verde
Alta (LVA) remained a periglacial desert, practically unvegetated, until about 11,000 cal yr B.P. At this time, a lycopod assemblage bearing no
modern analog colonized the superpa´ramo. Although this community persisted until ¨6000 cal yr B.P., it began to decline somewhat earlier, in
synchrony with cooling following the Holocene thermal maximum of the Northern Hemisphere. At this time, the pioneer assemblage was
replaced by a low-diversity superpa´ramo community that became established ¨9000 cal yr B.P. This replacement coincides with regional
declines in temperature and/or available moisture. Modern, more diverse superpa´ramo assemblages were not established until ¨4600 cal yr
B.P., and were accompanied by a dramatic decline in Alnus, probably the result of factors associated with climate, humans, or both. Pollen
influx from upper Andean forests is remarkably higher than expected during the Late Glacial and early to middle Holocene, especially between
14,000 and 12,600 cal yr B.P., when unparalleled high values are recorded. We propose that intensification of upslope orographic winds
transported lower elevation forest pollen to the superpa´ramo, causing the apparent increase in tree pollen at high altitude. The association
between increased forest pollen and summer insolation at this time suggests a causal link; however, further work is needed to clarify this
relationship.
eng
closedAccess
Palynology
Paleoecology
Paleoclimatology
Holocene
Neotropics
South America
Andes
Venezuela
15,000-yr pollen record of vegetation change in the high altitude tropical Andes at Laguna Verde Alta, Venezuela
artículo
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