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Abstract Detail

Systematics Section/ASPT

Campbell, Lesley [1], Teitel, Zachary [2], Miriti, Maria [3], Snow, Allison [4].

Contemporary evolution and the dynamics of persistence in crop-wild hybrids with heritable variation for two weedy life histories.

The ecological processes of population growth and persistence are shaped by the evolutionary characteristics of a population, that is, phenotypic frequencies and their relative fitness. Yet, there have been few experimental manipulations of adaptive, quantitative trait variation in experimental populations that subsequently explore the consequences for population growth rates. Indeed, over short time scales, gene flow can be a more significant source of adaptive genetic variation than mutation, especially in crop-wild complexes where parental populations are phenotypically differentiated. Using three genotypes with potentially invasive traits, early flowering (a wild-specific trait), large size (a crop-specific trait) or a control, we followed the lives of wild Raphanus raphanistrum and crop-wild hybrid R. raphanistrum x sativus plants, grown in experimental populations over one year, to assess contributions of individual vital rates (i.e., germination, survival, seed production) to λ. Vital rate data were analyzed using a Life Table Response Experiment design. Growth (λ) of these weedy populations was most influenced by seed production, a trait that was significantly affected by biotype and selection environment, relative to seed bank dynamics, germination, or survival. More seeds were produced by wild than hybrid populations and long-leafed than early-flowering lineages.Therefore, demographic growth and relative invasiveness may be significantly altered by genotypic frequencies and heritable variation for weedy traits within populations.

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1 - Ryerson University, Chemistry & Biology, 350 Victoria St, Toronto, ON, M5B 2K3, Canada
2 - Ryerson University, Chemistry and Biology, 350 Victoria St., Toronto, ON, M5B 2K3, Canada
3 - Ohio State University, Room 300 Aronoff Laboratory, 318 W. 12th Avenue, Columbus, OH, 43210, USA
4 - Ohio State University, EEOB Dept, 318 W. 12th Ave., Columbus, OH, 43210-1293, USA

none specified

Presentation Type: Oral Paper:Papers for Sections
Session: 49
Location: Salon 4/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 4:15 PM
Number: 49011
Abstract ID:875
Candidate for Awards:Margaret Menzel Award

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