Middle to late Holocene environmental change and archaeology on the north coast of central Cuba.
Published: 2005
Language: eng
Number of pages: 183
Description: Multiple proxy data were investigated from a lake and several mangrove systems on the north coast of central Cuba to document Holocene environmental changes, identify their causes, and provide an environmental basis to interpret the rich archaeological record of the region. Sediments were investigated for pollen, benthic foraminifera, ostracodes, gastropods, charophytes, O, C, and Sr isotopes, and elemental geochemistry.An oligohaline (&sim;1 &permil;) pond was present at Laguna de la Leche from &sim;7000 to 5800 14C yr B.P. From &sim;5800 to 4800  14C yr B.P., a freshening of the pond, concurrent with the shift from a Quercus to a Pinus dominated system throughout the southeast U.S., suggests that precipitation increased, possibly due to a change in atmospheric circulation. From &sim;4800 to 1700 14C yr B.P., relative sea level (RSL) rise caused salinity and water depth to increase, transforming Laguna de la Leche into an open, mesohaline (&sim;10 &permil;) lagoon. Since 1700 14C yr B.P., mangrove expansion isolated Laguna de la Leche from the sea.Pollen records from three mangrove systems provide information on the processes that influenced mangrove succession during the late Holocene. Northwest of Laguna de la Leche, local changes in drainage caused centennial-scale fluctuations in the distribution of Rhizophora and Avicennia. Another core, taken west of Laguna de la Leche, provides evidence for a landward migration of mangrove zones due to RSL rise. Allochotonous sedimentation and bioturbation may have been important within a chenier plain system. These results are important for predicting mangrove responses to global warming.A RSL curve shows that sea level was &sim;7 m below present level at &sim;7000  14C yr B.P. (&sim;7800 cal yr B.P.) and then rose in a linear manner to its present position. There is no evidence for a Holocene highstand. The data support a prediction from the ICE-5G (VM2) model that north-central Cuba lies within the region of proglacial forebulge collapse. The RSL curve also indicates that the Los Buchillones site, a presently submerged Taino village, was inundated prior to its construction at &sim;AD 1220. This information has important implications for understanding Taino settlement and subsistence patterns.
Notes: Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5291.

Thesis (Ph.D.)--University of Toronto, 2005.

Electronic version licensed for access by U. of T. users.