Phylogenetic investigations of soritid foraminifera (subfamily soritinae) and their dinoflagellate endosymbionts (genus Symbiodinium).
Item
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Title
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Phylogenetic investigations of soritid foraminifera (subfamily soritinae) and their dinoflagellate endosymbionts (genus Symbiodinium).
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Identifier
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AAI3284423
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identifier
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3284423
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Creator
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Cevasco, Megan E.
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Contributor
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Adviser: Mark E. Siddall
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Date
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2007
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Language
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English
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Publisher
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City University of New York.
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Subject
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Biology, Zoology | Biology, Microbiology
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Abstract
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The soritinae is a subfamily of endosymbiotic larger foraminifera that inhabit the shallow tropical to subtropical reef habitats. Three genera (Amphisorus, Marginopora, and Sorites) are recognized within this subfamily. Collection of soritine populations from six locations in the Atlantic Ocean, nine locations in the Pacific Ocean and one location in the Red Sea indicates that previously unrecognized morphological and molecular diversity exists within this group. Both small and large subunit ribosomal sequence data, as well as 30 coded morphological characters, were analyzed for 112 soritine taxa using an optimality criterion of parsimony. Within the genus Amphisorus, five clades were recovered representing the two existing species A. hemprichii and A. kudakajimaensis , one species Amphisorus saurensis described herein, and potentially two additional species requiring description. Patterns of ribosomal molecular diversity within Marginopora and Sorites indicate that, although these two genera are morphologically distinct, they are not monophyletic.;Molecular phylogenetic analyses of cultured dinoflagellate endosymbionts (genus Symbiodinium) harbored within soritine taxa place the isolates among three clades (A, C, and F). The sequences of four cultures correspond to those recovered through direct amplification of sequences from host taxa. The combination of five separate gene regions from ribosomal, mitochondrial, and plastid DNA produces parsimony solutions (trees) with greater resolution and nodal support than is recovered from any individual gene analysis. Initial observations of chloroplast structure reveal two major morphological types (petal and reticulate). This character, when mapped on the molecular cladograms, was found to be homoplastic. This represents the first molecular characterization of cultured Symbiodinium isolates from soritine hosts.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
