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Environmental and ecological pattern...

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Environmental and ecological patterns in modern and Pleistocene Caribbean coral reef sediment.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Environmental and ecological patterns in modern and Pleistocene Caribbean coral reef sediment./
作者:	Llewellyn, Ghislaine.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1997,
面頁冊數:	165 p.
附註:	Source: Dissertation Abstracts International, Volume: 58-09, Section: B, page: 4678.
Contained By:	Dissertation Abstracts International58-09B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9810684
ISBN:	9780591613605

Environmental and ecological patterns in modern and Pleistocene Caribbean coral reef sediment.
Llewellyn, Ghislaine.

Environmental and ecological patterns in modern and Pleistocene Caribbean coral reef sediment. - Ann Arbor : ProQuest Dissertations & Theses, 1997 - 165 p.

Source: Dissertation Abstracts International, Volume: 58-09, Section: B, page: 4678.

Thesis (Ph.D.)--Harvard University, 1997.

Compositional attributes of reef sediment provide high resolution tools for identifying environmental characteristics in modern and Pleistocene Caribbean reef environments. Based on the results of laboratory experiments and field data, the amount of fragmentation of the calcareous green alga Halimeda records relative energy regime and can be used to place samples within a framework of relative depths. Sediments from Belize show a higher frequency of Halimeda fragmentation in sediments from shallow, exposed sites than from deeper, less exposed settings. In a broad survey of modern Caribbean reef sediments, the relative abundance of both Halimeda and coral fragments are found to vary depending on proximity to a lagoon system and can be used to place reefs with a framework of relative nutrient regime. Belize barrier reef, Florida bank reef and the barrier reef in Guadeloupe all lie in close proximity to major lagoon systems and contain $>$10% Halimeda in constituent grain analysis of skeletal grain types. The Curacao fringing reef, Barbados bank reef and the fringing reefs in Guadeloupe all lack lagoon development and possess $$60% Coral fragments in sediment analyses. Compositional effects due to differences in depth between 10 m and 20 m were only detectable in Belize and consisted of higher abundance of wave-resistant organisms such as coralline red algae and encrusting benthic foraminiferans in shallow sediment. In shallow-water, high-energy reef environments, compositional patterns associated with energy regime are more pronounced. Using Pleistocene reef material from Curacao, the highest energy reef crest sites on the windward side of the island have sediments dominated by organisms with encrusting growth forms, whereas quieter leeward reef crest sediments are dominated by coral fragments. Based on the research presented above, compositional attributes of reef sediment provide sensitive tools for resolving physical conditions in reef environments, at scales ranging from within reef zonation, to regional patterns of variation among reefs. Studies of Pleistocene reef coral community dynamics and Pleistocene climate data based on corals both require accurate constraints on local environment conditions. Sediment based criteria offer a sensitive means of delineating environmental conditions, independent of the corals, allowing the effects of local shifts in physical conditions to be separated from patterns of global-scale environmental change.

ISBN: 9780591613605Subjects--Topical Terms:

516570
Geology.

Environmental and ecological patterns in modern and Pleistocene Caribbean coral reef sediment.
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