کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4465892 1622154 2015 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Holocene environmental change at Laguna Saladilla, coastal north Hispaniola
ترجمه فارسی عنوان
تغییر محیط زیست هولوسن در لاگونا سالادیلا، هسپانیولا شمالی ساحلی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• We inferred environmental changes over the Holocene in coastal north Hispaniola.
• Changes were inferred using multi-proxy data from a sediment core.
• Laguna Saladilla progressed from marine to brackish ca. 3500 cal yr BP.
• The lake transitioned to its current freshwater condition ca. 2500 cal yr BP.
• Shifts in the mean position of the ITCZ coincide with drier conditions.

We inferred environmental changes over the middle to late Holocene in coastal north Hispaniola using pollen, microscopic charcoal, mollusk shells, and diatoms in an 8.5-m sediment core from Laguna Saladilla, Dominican Republic (19°39′ N, 71°42′ W; ~ 2 m above sea level). Changes in Rhizophora (red mangrove) pollen percentages and in mollusk and diatom assemblages indicate major changes in salinity and water depth related to relative sea level rise and possible shifts in precipitation. Rhizophora percentages were highest at 7650 cal yr BP, when mollusk shells indicate the lake was connected to the Atlantic Ocean. Laguna Saladilla became progressively brackish ca. 3500 cal yr BP, and transitioned ca. 2500 cal yr BP to its current freshwater condition. High percentages of Amaranthaceae pollen and increased charcoal concentrations over the last ca. 2500 years signal dry climate and increased fires in coastal north Hispaniola. Geomorphological changes over time at Laguna Saladilla partially mask evidence of climate change in the proxies examined, and the record is equivocal before 2500 cal yr BP. Evidence for drier conditions since 2500 cal yr BP is consistent with late-Holocene shifts in the mean position of the Intertropical Convergence Zone (ITCZ) that have been identified on the Caribbean side of Hispaniola. We interpret the record as indicating that ITCZ migratory dynamics may also have affected precipitation on the Atlantic edge of the Greater Antilles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 436, 15 October 2015, Pages 9–22
نویسندگان
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