Dissertation/Thesis Abstract

Freshwater diatoms as a proxy for Late Holocene monsoon intensity in Lac Ba Bê in the Karst Region of Northern Viêt Nam
by Weide, Denise Marie, M.S., California State University, Long Beach, 2012, 148; 1522269
Abstract (Summary)

Diatom assemblages from a sediment core from Lac Ba Bê in the northern mountains of Viêt Nam were analyzed at sub-decadal to sub-annual resolution to assess environmental change over the last 500 years. The most striking feature of the core is the change in diatom assemblages in the top 4 cm of the core (late 1970s/early 1980s). This section is distinguished by a flora that is characterized by a high planktic to benthic ratio and the dominant species require relatively low nutrients when compared to diatoms in the rest of the core. In particular, it marks the introduction of two Cyclotella species that become the dominant planktic species and a related decline in Aulacoseira species. The change in flora is interpreted as a possible response to a weakened Southeast Asian Monsoon beginning in the 1970s. In addition to the environmental change, a new species of Aulacoseira is described from Ba Bê.

Indexing (document details)
Advisor: Stevens, Lora R.
School: California State University, Long Beach
School Location: United States -- California
Source: MAI 51/05M(E), Masters Abstracts International
Subjects: Paleontology, Paleoecology, Paleoclimate Science
Publication Number: 1522269
ISBN: 978-1-267-97764-9
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