A comparison of life-history strategies and environmental effects upon populations of Armadillidium vulgare in three habitats

dc.contributor.advisorCameron, Guy N.
dc.contributor.committeeMemberBryant, Edwin H.
dc.contributor.committeeMemberLester, L. James
dc.contributor.committeeMemberOsburn, Hobart G.
dc.creatorMiller, Ross Henry
dc.description.abstractIndividual populations of Armadillidium vulgare in a Chinese tallow forest, a red oak forest, and in a Baccharis-grassland area were compared for one year. Time-specific life tables were prepared for each population. R0 for isopods in the tallow, oak, and Baccharis was 7.59, 7.46, and 16.63 respectively. Mean generation time (T) was 245 days, 337 days, and 532 days. Values of r/female/50 days were .01020, .00669, and .00617. Isopods in the Baccharis were found to have significantly extended survivorship in comparison to isopods in the other two habitats. Densities in the Baccharis were lower and fluctuated less than densities in the tallow and oak forests. Densities in oak forest were higher than those in the tallow and Baccharis areas. Densities in the tallow and oak forests increased sharply during spring and summer and declined throughout the winter. Density fluctuations were found to be related to changes in mean monthly temperature within the tallow and oak forests. Reproductive capacity of females in all three areas increased directly with length and did not differ significantly between habitats.
dc.description.departmentBiology and Biochemistry, Department of
dc.format.digitalOriginreformatted digital
dc.rightsThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.
dc.titleA comparison of life-history strategies and environmental effects upon populations of Armadillidium vulgare in three habitats
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentBiology, Department of
thesis.degree.grantorUniversity of Houston
thesis.degree.nameMaster of Science


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