Investigating the species diversity of Planorbella and Helisoma (Gastropoda: Hygrophila: Planorbidae) in Manitoba

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dc.contributor.authorRempel, Emma
dc.contributor.examiningcommitteeWilkins, Olivia (Internal, Biological Sciences)en_US
dc.contributor.examiningcommitteeMarcus, Jeffrey (Internal, Biological Sciences)en_US
dc.contributor.supervisorDetwiler, Jillian (Biological Sciences)en_US
dc.date.accessioned2021-09-09T15:36:28Z
dc.date.available2021-09-09T15:36:28Z
dc.date.copyright2021-08-21
dc.date.issued2021en_US
dc.date.submitted2021-08-21T15:17:45Zen_US
dc.degree.disciplineBiological Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractSpecies-level resolution is lacking for freshwater gastropods in Family Planorbidae, with factors like cryptic species, phenotypic variation, and potential misidentifications confounding estimates of biodiversity. To characterize the diversity of five nominal planorbid species (four Planorbella and one Helisoma), I compared descriptive morphology-based identifications to phylogenetic (COI gene) and geometric morphometric analyses of shell shape. I recovered five genetically distinct clades though two clades may contain cryptic species. Shell shape analysis confirmed morphological overlap between some species and confirmed that shell-based identifications can be problematic for species-level identification. For each of the five clades, I sequenced the complete mitogenomes and nuclear rRNA repeat regions. Comparisons among the mitochondrial (COI gene and mitogenome) and nuclear gene phylogenies (concatenated 18S/28S, ITS1-5.8S-ITSII, rRNA repeat region) resulted in some incongruence suggesting past hybridization between two species. These findings show that an integrative approach to species delimitation is essential for understanding the biology of freshwater gastropods.en_US
dc.description.noteOctober 2021en_US
dc.identifier.urihttp://hdl.handle.net/1993/35931
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectPlanorbidaeen_US
dc.subjectIntegrative taxonomyen_US
dc.subjectPhylogenyen_US
dc.subjectSpecies diversityen_US
dc.titleInvestigating the species diversity of Planorbella and Helisoma (Gastropoda: Hygrophila: Planorbidae) in Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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