DOI: 10.1016/j.palaeo.2012.10.007
论文题名: Late-Holocene paleoenvironmental history of bioluminescent Laguna Grande, Puerto Rico
作者: Lane C.S. ; Clark J.J. ; Knudsen A. ; McFarlin J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 369 起始页码: 99
结束页码: 113
语种: 英语
英文关键词: Charcoal
; Dinoflagellate
; Particle size
; Pollen
; Stable isotopes
英文摘要: Coastal lagoons are valuable natural resources and ecotourism hotspots that are at great risk due to human development and global climate change. In order to protect these resources it is important that we fully understand the paleoenvironmental history of these unique ecosystems and their sensitivity to environmental change. Here we present a multi-proxy (pollen, charcoal, grain-size, dinoflagellate cyst, stable isotope geochemistry, and foraminifera) 3600. cal. yr B.P. record of paleoenvironmental change for Laguna Grande, Puerto Rico, which is a particularly unique coastal lagoon as it contains high abundances of the bioluminescent dinoflagellate Pyrodinium bahamense. Sedimentary evidence indicates that the Laguna Grande basin began accumulating sediment ~ 3600. cal. yr B.P. coincident with regional sea level rise, but the modern lagoon itself is geologically quite young and did not become fully enclosed until ~ 575. cal. yr B.P. due to longshore depositional processes and mangrove swamp development. Foraminifera assemblages suggest a potential breach of a protective barrier ~ 1550. cal. yr B.P. perhaps as a result of a tropical storm or tsunami and is coincident with an increase in fire activity. Only two high-energy depositional units (tempestites) could be identified in the lagoon sediments over the last 575. cal. yr B.P. indicating minimal impact by tropical storms or tsunamis on the lagoon since isolation from the open ocean. Fossil dinoflagellate cyst concentrations and influxes do not approach modern levels until ~ 200. cal. yr B.P. and are currently at the highest levels in the history of the lagoon, indicating the lagoon may have become bioluminescent only recently, perhaps as a result of anthropogenic nutrient additions. Sedimentation rates support this hypothesis indicating a recent tripling of sedimentation rates when compared to millennial-scale sedimentation rates. This study highlights the utility of paleolimnological data in the management and preservation of at-risk coastal lagoon ecosystems. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69901
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography and Geology, University of North Carolina Wilmington, Wilmington, NC 28403, United States; Department of Geology, Lawrence University, Appleton, WI 54911, United States
Recommended Citation:
Lane C.S.,Clark J.J.,Knudsen A.,et al. Late-Holocene paleoenvironmental history of bioluminescent Laguna Grande, Puerto Rico[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,369