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Schwaegerle, Kent Edward 2014-12-16T06:21:56Z 2014-12-16T06:21:56Z 10000-01-01 1984 1984 The niche-variation hypothesis, which predicts a correlation between niche breadth and level of genetic variation, was tested using nine populations of the annual plant, Phlox drummondii, from south central Texas. Niche breadth was measured as population response along controlled environmental gradients. Statistically significant differences among populations in survival, vegetative growth, and flowering were observed in response to different levels of moisture, light, nutrients, and competition. Differences in germination were observed in response to temperature and nutrient levels. Genetic variation was quantified by examining allozyme variability at five polymorphic loci and by analysis of morphological variation among families of full and half sibs. Statistically significant heritabilities were found for 16 morphological and life history characters, as well as significant differences among populations in levels of additive genetic variance. Despite widespread differentiation among these populations for both genetic and ecological variables, no relation emerged between niche breadth and genetic variation. Made available in DSpace on 2014-12-16T06:21:56Z (GMT). No. of bitstreams: 1 8502294.pdf: 4686125 bytes, checksum: 07102e124810870e02f79fd4b0e74b68 (MD5) Previous issue date: 1984 Embargo set by: Seth Robbins for item 71444 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 144 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984. http://hdl.handle.net/2142/71278 (UMI)AAI8502294 Biology, Botany Relationships Between Genetic and Ecological Variables in Nine Populations of Phlox Drummondii Hook (Niche, Allozymes, Genetic Differentiation) text Plant Biology Plant Biology University of Illinois at Urbana-Champaign Dissertation Ph.D.