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Abstract Detail

Physiology & Ecophysiology

Kostanecki, Adam [1], Gorton, Amanda J [2], Moeller, David A [3].

Urban heterogeneity drives high phenotypic diversity in urban compared to rural populations of common ragweed.

Urbanization results in environmental changes that impose biotic and abiotic selective pressures on urban plant populations. A low presence of pollinators and a highly fragmented landscape can establish a difficult environment for pollination and therefore limit successful seed production. Further, cities experience higher temperatures, CO2 concentrations, and pollution, relative to rural areas, which can affect the rates of survival and reproductive success of urban plant populations. These ecological differences make studies of adaptive evolution in urban populations of particular interest, especially as urban environments can simulate the broader effects of global climate change. Within urban environments, populations are often fragmented and occupy a diverse array of microhabitats, that may exert distinct selective pressures and result in differentiation among populations. Differences in phenotypic traits have been observed in plants growing in urban environments when compared to rural populations. In a study by Gorton et. al. (unpublished), common ragweed (Ambrosia artemisiifolia) populations in urban Minneapolis exhibited genetic differentiation in flowering time and seed production. I have investigated this further by studying A. artemisiifolia grown from seeds gathered from urban and rural populations of St. Louis, MO, in order to assess the genetic heterogeneity of urban plant populations. I hypothesize that A. artemisiifolia gathered from urban populations will exhibit greater phenotypic variation in germination, male flowering spike count, and mature fruit count, compared to plants from rural populations that receive the same treatment. This would suggest urban ragweed populations exhibit higher phenotypic diversity due to higher relative environmental heterogeneity.

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1 - University of Minnesota, Dept. of Plant and Microbial Biology, 1445 Gortner Avenue, St. Paul, MN, 55108, USA
2 - University of Minnesota, Dept. of Ecology, Evolution and Behavior, 100 Ecology Building, 1987 Upper Buford Circle, St. Paul, MN, 55108, USA
3 - University of Minnesota, Dept. of Plant and Microbial Biology, 304 Biological Sciences, 1445 Gortner Avenue, St. Paul, MN, 55108, USA

urban evolution
genetic differentiation
population biology
urban flora.

Presentation Type: Poster
Session: P, Physiology & Ecophysiology
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PPE012
Abstract ID:923
Candidate for Awards:Physiological Section Best poster presentation,Physiological Section Physiological Section Li-COR Prize

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