Document: MAR-3-47-6

Genetic constraints on population success in Clarkia concinna .

GROOM, M.* 1,2 and T.PREUNINGER 3

University of Washington, Seattle, WA 98195 USA 1
University of Washington - Bothell, Bothell, WA 98021 USA 2
North Carolina State University, Raleigh, NC 27695 USA 3

Abstract:
We conducted a series of experiments to examine how genetic variability and inbreeding levels affect individual and population level performance in Clarkia concinna . Experimental populations that varied in the number of maternal families represented did not differ in performance, although those derived from one maternal family were more variable. Populations derived from many maternal families survived better to the next year than those derived from one maternal family. Extensive greenhouse and field experiments revealed strong inbreeding depression for several characters (height, above-ground biomass and flower or fruit number). In one experiment, we found that plants from central populations expressed a greater magnitude of inbreeding depression than ones from isolated populations. These experiments provided mixed evidence for the importance of genetic variability for population viability.

Keywords: genetic variability, inbreeding depression, population performance

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