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The evolution and biogeography of Ne...

Ross, Robert Merrill.

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The evolution and biogeography of Neogene Micronesian Ostracodes: The role of sea level, geography, and dispersal.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The evolution and biogeography of Neogene Micronesian Ostracodes: The role of sea level, geography, and dispersal./
作者:	Ross, Robert Merrill.
面頁冊數:	582 p.
附註:	Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3299.
Contained By:	Dissertation Abstracts International51-07B.
標題:	Paleontology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9035543

The evolution and biogeography of Neogene Micronesian Ostracodes: The role of sea level, geography, and dispersal.
Ross, Robert Merrill.

The evolution and biogeography of Neogene Micronesian Ostracodes: The role of sea level, geography, and dispersal. - 582 p.

Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3299.

Thesis (Ph.D.)--Harvard University, 1990.

Ostracodes from the Neogene of Enewetak, modern Micronesia, and other Pacific localities were studied to understand better the evolution of marine organisms on tropical oceanic islands. Temporo-spatial patterns in ostracode species composition and species richness, and in the morphology of species of the genus Loxoconcha, indicate that the evolution and biogeography of Quaternary Micronesian benthic ostracodes has been controlled by local extinction due to high amplitude glacio-eustatic sea level fluctuations and distance among atoll lagoons. Hierarchical clustering in species composition suggests that colonization takes place primarily from neighboring lagoons. Change from Late Pliocene to Holocene assemblages at Enewetak is concentrated at disconformities rather than within zones between them, suggesting that survival of sea level drops or ability to recolonize determine the character of species assemblages. Assemblage turnover from the Late Miocene to Early Pliocene, during relatively stable high sea level, is more gradual in nature, and the turnover trend is nearly independent of the Late Pliocene to Quaternary trend toward modern samples. Among modern Micronesian lagoons, the highest species richness occurs on high islands to the west; similar diversity is associated with high island conditions in the Miocene at Enewetak. Species richness drops to levels typical of modern lagoons over a disconformity near the Plio-Pleistocene boundary.Subjects--Topical Terms:

518862
Paleontology.

The evolution and biogeography of Neogene Micronesian Ostracodes: The role of sea level, geography, and dispersal.
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245 1 4 $a The evolution and biogeography of Neogene Micronesian Ostracodes: The role of sea level, geography, and dispersal.
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500 $a Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3299.
502 $a Thesis (Ph.D.)--Harvard University, 1990.
520 $a Ostracodes from the Neogene of Enewetak, modern Micronesia, and other Pacific localities were studied to understand better the evolution of marine organisms on tropical oceanic islands. Temporo-spatial patterns in ostracode species composition and species richness, and in the morphology of species of the genus Loxoconcha, indicate that the evolution and biogeography of Quaternary Micronesian benthic ostracodes has been controlled by local extinction due to high amplitude glacio-eustatic sea level fluctuations and distance among atoll lagoons. Hierarchical clustering in species composition suggests that colonization takes place primarily from neighboring lagoons. Change from Late Pliocene to Holocene assemblages at Enewetak is concentrated at disconformities rather than within zones between them, suggesting that survival of sea level drops or ability to recolonize determine the character of species assemblages. Assemblage turnover from the Late Miocene to Early Pliocene, during relatively stable high sea level, is more gradual in nature, and the turnover trend is nearly independent of the Late Pliocene to Quaternary trend toward modern samples. Among modern Micronesian lagoons, the highest species richness occurs on high islands to the west; similar diversity is associated with high island conditions in the Miocene at Enewetak. Species richness drops to levels typical of modern lagoons over a disconformity near the Plio-Pleistocene boundary.
520 $a Morphological variation within loxoconchid species is lower among modern lagoons across Micronesia than through geologic time at Enewetak. Possibly variants first colonize one Micronesian lagoon from outside the region, and then spread throughout Micronesia. Most temporal morphologic variation is among temporally stable variants that go locally extinct primarily at disconformity boundaries. In most species there is little net trend in morphology since the Miocene.
520 $a Morphologic and assemblage data provide complementary information on evolution and biogeography in the region. Both suggest that populations at any one point in time, even without gene flow, are more related to geographically surrounding populations than to populations that have preceded them in geologic time at the same lagoon. Extinction and rapid recolonization have therefore acted to create temporal heterogeneity and spatial homogeneity within linages and perhaps within assemblages in Micronesia.
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