Abstract Detail

Ecological Section

Tracey, Christopher [1], Michaels, Helen [1], Bouzat, Juan [1].

The effect of population size on phenotypic plasticity in the threatened plant Lupinus perennis.

To evaluate the potential effects of population size on phenotypic plasticity we performed a greenhouse experiment examining the growth response of four large and four small populations of Lupinus perennis under two light environments (full sun and 70% shade). We estimated the amount and patterns of plasticity within and among populations as well as genetic variation for phenotypic plasticity. All measured traits (biomass, leaf number, petiole length and specific leaf area) exhibited significant responses to light. In addition, populations and maternal families differed in their average responses to light for most traits. In contrast to large populations, small populations, although varying in their response to light level for most traits, showed reduced genetic variation for plasticity. Our results indicate that population size reductions may change the amount and patterns of phenotypic plasticity in natural populations, limiting future potential for adaptation to variable environments.

1 - Bowling Green State University, Biological Sciences, Life Science Building, Bowling Green, Ohio, 43403, USA

Keywords:
phenotypic plasticity
threatened plant
population size.

Presentation Type: Paper
Session: 29-14
Location: Wasatch (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 11:30 AM
Abstract ID:845