Show simple item record

dc.contributor.advisorForstner, Michael R.
dc.contributor.authorVandewege, Michael W.
dc.date.accessioned2014-05-01T14:54:01Z
dc.date.available2014-05-01T14:54:01Z
dc.date.issued2011-05en_US
dc.date.submittedMay 2011
dc.identifier.urihttps://digital.library.txstate.edu/handle/10877/5003
dc.description.abstractThe Houston Toad (Bufo houstonensis) was first described in 1953 and due to habitat loss and severe droughts the species was placed on the endangered species list in 1970. In 2007, a head-starting project was implemented using tadpoles and juveniles that cannot be marked by traditional means. I developed a method to use molecular genotyping arrays and tested four full sibling reconstruction algorithms to estimate the frequency of head-starts on the landscape. The overall allelic retention of the head-starts was 67% of the wild population. The percent retention ranged from 28% to 90% among subpopulations. COLONY was the most accurate family assignment software placing 97% of samples into their appropriate sib groups. Several of these groups (20%) showed evidence of multiple paternity but it is unclear if this is the result of multiple amplexus events, indirect fertilization, or physical cross contamination of egg strands either in captivity or upon collection from the wild. I estimated the over winter survivorship of post-metamorphosed juveniles to be 0.001. Given the low survivorship and low frequency of head-starts on the landscape, this age group is not efficient for head-starting and adult head-starts should be tested for survivorship in the coming years.
dc.formatText
dc.format.extent84 pages
dc.format.medium1 file (.pdf)
dc.language.isoen_US
dc.subjectHouston Toad
dc.subjectHead-starting
dc.subjectMicrosatellites
dc.subjectConservation genetics
dc.subjectPedigree reconstruction
dc.titleUsing Pedigree Reconstruction to Test Head-Starting Efficiency for Endangered Amphibians: Field Tested in the Houston Toad (Bufo Houstonensis)
txstate.documenttypeThesis
dc.contributor.committeeMemberNice, Chris C.
dc.contributor.committeeMemberMartin, Noland H.
thesis.degree.departmentBiologyen_US
thesis.degree.disciplineBiology
thesis.degree.grantorTexas State University-San Marcosen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
txstate.departmentBiology


Download

Thumbnail

This item appears in the following Collection(s)

Show simple item record