Document: ELL-3-39-10
Interpopulation variation in between-year seed dormancy: Environmental, maternal environmental, and genetic effects.
SIMMS, E.L.* 1, P.KITTELSON 2 and J.L.MARON 3
University of California, Berkeley, CA 94720 USA 1
Gustavus Adolphus College, St. Paul, MN USA 2
University of Washington, Seattle, WA 98195 USA 3
Abstract:
Seed dormancy was compared between adjacent yellow bush lupine (Lupinus arboreus) populations with contrasting life histories and population dynamics. Dunes populations have stable numbers of long-lived adults and sparse seed banks; adjacent (100-m distant) grassland populations are characterized by dense even-aged stands of short-lived adults that emerge from a dense seed bank and experience frequent die-offs. We used a reciprocal transplant experiment with grand-progeny from two diallel designs conducted within each population to partition total variance in dormant fraction into genetic, maternal environment, and germination environment causal components. Further, we obtained estimates of heritability for dormant fraction within populations. All causal components contributed significantly to total variance. Previous study indicates considerable gene flow among these populations. Our results therefore suggest strong habitat differences in selection on dormancy or some correlated trait(s).
Keywords: seed dormancy, seed bank, population dynamics, life history
This abstract is being presented at: 10:30 AM in session:
DISPERSAL