Geographical variation in the genus Astarte (Phylum Mollusca: Class Bivalvia) from the Yorktown and Jackson Bluff formations (early Pliocene) of the Atlantic coastal plain

dc.contributor.authorMcKeever, Lauren Joannen
dc.contributor.committeechairGilinsky, Norman L.en
dc.contributor.committeememberCarter, Joseph G.en
dc.contributor.committeememberBambach, Richard K.en
dc.contributor.departmentGeological Sciencesen
dc.date.accessioned2014-03-14T21:40:31Zen
dc.date.adate2010-07-15en
dc.date.available2014-03-14T21:40:31Zen
dc.date.issued1985en
dc.date.rdate2010-07-15en
dc.date.sdate2010-07-15en
dc.description.abstractGeographical variation in taxa must be considered in evolutionary studies. The purpose of the present study is to demonstrate how geographical variation can be measured and documented for a taxon for one slice of time. Future evolutionary studies should document geographical variation for the entire geographical range of the species involved at several points of time throughout its total stratigraphic range. Thus the variation that is present at one time horizon may be separated from the variation that occurs through time. This work consists of a study of geographical variation in the genus Astarte (Phylum Mollusca: Class Bivalvia) from the Yorktown and Jackson Bluff Formations (early Pliocene) of the Atlantic Coastal Plain. Factor analysis, multivariate analysis of variance, and discriminant analysis were performed on measurements of specimens of Astarte from ten localities. There are significant differences in the morphologies of individuals among localities. These differences are due to the presence of different species of Astarte and to variation in size and external ornamentation within the same species. Seven species recognized from literature on Pliocene Astarte were identified among the individuals of the ten localities, but the statistical results indicate that these seven species may be grouped into three "types" that mayor may not represent species. The three types occur together in some localities, suggesting that they are distinct species living in sympatry. Factors influencing geographical variation include larval dispersal strategy and the effect of the environment.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 139 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07152010-020200en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07152010-020200/en
dc.identifier.urihttp://hdl.handle.net/10919/43739en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1985.M334.pdfen
dc.relation.isformatofOCLC# 12998473en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1985.M334en
dc.subject.lcshBivalves -- Geographical distributionen
dc.titleGeographical variation in the genus Astarte (Phylum Mollusca: Class Bivalvia) from the Yorktown and Jackson Bluff formations (early Pliocene) of the Atlantic coastal plainen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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