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dc.contributor.advisorPortnoy, David S.
dc.contributor.authorPineda, Kaylee
dc.date.accessioned2022-08-02T17:36:34Z
dc.date.available2022-08-02T17:36:34Z
dc.date.issued2022-05
dc.identifier.urihttps://hdl.handle.net/1969.6/93576
dc.description.abstractFreshwater shrimps in the genus Macrobrachium are ecologically and economically important as they provide essential services in habitats through a range in ecological roles such as detritus removal and predation as well as being prey items for large fish. Economically, Macrobrachium species have been exploited for aquaculture as well as commercial and recreation fisheries. Despite their importance, species distributions in Macrobrachium are poorly understood as the species exhibit similar morphologies making delineation difficult. The amphidromous lifestyle exhibited in many Macrobrachium species, including all that are native to the US, limits the dispersal capabilities potentially separating populations and allowing for localized adaptations. This lifestyle opens Macrobrachium species to multiple vulnerabilities such as habitat degradation and loss due to damming, land-use alterations, and pollution as well as past exploitation which have resulted in striking population declines of Macrobrachium species occurring in the United States. This study developed a robust phylogenetic hypothesis for M. carcinus throughout the species known distribution, including other North American species of Macrobrachium as outgroups using mitochondrial genes and made a preliminary assessment of M. ohione population structure between individuals occurring in different bay systems using mitochondrial cytochrome oxidase subunit I (COI). Phylogenetic trees created in BEAST and MEGA showed monophyly in the group as well as three genetically distinct clades of M. carcinus Puerto Rico, Central/South America, and Texas. Net p-distances of between these three clades were among species level divergences. Preliminary population assessment on M. ohione showed low levels of genetic diversity, which could be due to marker choice, but did show recent population expansion into Texas coastal streams.en_US
dc.format.extent74 pagesen_US
dc.language.isoen_USen_US
dc.rightsThis material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher.en_US
dc.subjectCOIen_US
dc.subjectgenetic diversityen_US
dc.subjectMacrobrachiumen_US
dc.subjectnew speciesen_US
dc.subjectphylogenyen_US
dc.subjectpopulation geneticsen_US
dc.titleGenetic assessment of Macrobrachium species in Texas coastal streamsen_US
dc.typeTexten_US
thesis.degree.disciplineBiologyen_US
thesis.degree.grantorTexas A & M University--Corpus Christien_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
dc.contributor.committeeMemberHogan, J. Derek
dc.contributor.committeeMemberPatrick, Christopher
dc.contributor.committeeMemberJones, Ivy C.
dc.creator.orcidhttps://orcid.org/0000-0002-5958-5918en_US
dc.description.departmentLife Sciencesen_US
dc.description.collegeCollege of Science and Engineeringen_US
dc.type.genreThesisen_US


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