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Articles 1 - 3 of 3
Full-Text Articles in Evolution
Xenopus Laevis As A Model Organism, David C. Cannatella, Rafael O. De Sá
Xenopus Laevis As A Model Organism, David C. Cannatella, Rafael O. De Sá
Biology Faculty Publications
Model organisms are often assumed to be representative of some more inclusive taxon of which the species is a part. This assumption leads to mistaken generalizations about the evolutionary and comparative significance of the data gathered. This paper reviews com? parative and evolutionary studies of Xenopus laevis and its relatives. Phylogenetic analysis of data from DNA sequences and morphology indicate that Xenopus is monophyletic and that Silurana is its sister group. The most basal lineages of Pipidae diverged prior to the breakup of Gondwana. The bizarre morphology of Xenopus is in part due to changes in the mode of meta? …
The Relationship Between Lifespan And Reproduction In The Giant Waterbug (Belostoma Flumineum), Wendy Nixdorf
The Relationship Between Lifespan And Reproduction In The Giant Waterbug (Belostoma Flumineum), Wendy Nixdorf
Masters Theses
The evolutionary significance of senescence and death is poorly understood. Life history theory suggests that the allocation of energy to growth or reproduction is necessarily associated with a decrease in energy available for maintenance of the soma. This study attempted to determine if an investment in reproduction would decrease longevity in the giant waterbug (Belostoma flumineum). Male and female waterbugs were collected from the field as last instar stage nymphs and maintained under controlled laboratory conditions. Individuals were randomly assigned to mating effort treatments, (virgins or breeders with breeding efforts ranging from 1 to >5 times). Following breeding, …
Book Review Of Parascript: Parasites And The Language Of Evolution By D. R. Brooks And D. A. Mclennan, Smithsonian Institution Press, Washington, D.C., 1993., Eric P. Hoberg
Harold W. Manter Laboratory of Parasitology: Faculty Publications
Review of Parascript: Parasites and the Language of Evolution by Daniel R. Brooks and Deborah A. McLennan, with bibliographical references.