Patterns of endemism and species richness of fishes of the Western Gulf Slope

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dc.contributor.advisorBonner, Timothy H.
dc.contributor.authorMaxwell, Robert J.
dc.contributor.committeeMemberHuston, Michael
dc.contributor.committeeMemberHendrickson, Dean
dc.date.accessioned2012-11-15T19:24:06Z
dc.date.available2012-11-15T19:24:06Z
dc.date.issued2012-12
dc.description.abstractContemporary freshwater fish communities are influenced by selection mechanisms (i.e., species-area relationships; species-energy relationships) with the role of historical mechanisms (i.e., speciation and dispersal) poorly understood and largely understated. I assessed the influence of selection and historical mechanisms on species richness and endemism among fish communities of the Western Gulf Slope (WGS). Distributions within the WGS generally conformed to predictions generated from global freshwater fish distributions. Species richness was greatest (P < 0.01) in wetter regions, and endemism was greatest (P < 0.01) in drier regions of the WGS. To assess historical mechanisms, fish phylogenies were used to determine direction, origin, and timing of dispersion into the WGS. Based on these findings, multiple events of colonization into the WGS likely occurred from the late Miocene until the start of the Holocene. Contemporary lineages represent ancestral origins and routes from the north (28% of the 155 native fishes of the WGS; beginning during the Late Miocene), southwest (15%; Late Miocene/Early Pliocene), north-east (14%; Pleistocene), and east (44%; Pleistocene through Holocene). Recent colonizers (north-east and east) attributed to the greatest numbers (67 to 93%) of widespread taxa within the WGS, whereas older lineages (north and southwest) attributed to the greatest number (92%) of endemics. Furthermore, greatest species richness was in the eastern WGS, nearest the source (e.g., Mississippi River) of most recent colonizers during the last glacial maximum. Consequently, historical influences obscured contemporary influences of selection mechanisms. Nevertheless, a consistent pattern of colonization and extirpation has emerged since the Late Miocene, which likely will continue to influence species richness and endemism in the WGS and can be used to inform fish conservation policy.
dc.description.departmentBiology
dc.formatText
dc.format.extent155 pages
dc.format.medium1 file (.pdf)
dc.identifier.citationMaxwell, R. J. (2012). <i>Patterns of endemism and species richness of fishes of the Western Gulf Slope</i> (Unpublished thesis). Texas State University-San Marcos, San Marcos, Texas.
dc.identifier.urihttps://hdl.handle.net/10877/4372
dc.language.isoen
dc.subjectEndemism
dc.subjectSpecies richness
dc.subjectFish
dc.subjectWestern Gulf Slope
dc.subjectAncestral
dc.subjectOrigins
dc.subject.lcshFishes--Texasen_US
dc.subject.lcshFishes--Texas--Gulf Regionen_US
dc.subject.lcshFishes--Gulf Coast (U.S.)en_US
dc.subject.lcshFreshwater fishes--Texasen_US
dc.subject.lcshEndemic animals--Texasen_US
dc.subject.lcshFish populations--Texasen_US
dc.titlePatterns of endemism and species richness of fishes of the Western Gulf Slope
dc.typeThesis
thesis.degree.departmentBiology
thesis.degree.disciplineAquatic Resources
thesis.degree.grantorTexas State University--San Marcos
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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