The reproductive ecology, demography, and population genetic structure of Arctomecon californica Torrey and Fremont (Papaveraceae) in fragmented and unfragmented habitat

rctomecon californica is endemic to gypsum outcrops of the northern Mojave Desert. Native habitat of this plant in the Las Vegas Valley has been severely fragmented. I found A. californica flowers to be mostly self-incompatible, and thus require a pollen vector for successful seed production. Evidence of pollinator limitation was found in both habitat types, but plants in fragmented habitat were much less successful reproductively. The number and diversity of pollinators were higher in unfragmented habitat. Specialist bees found visiting poppy flowers in unfragmented habitat were absent from study sites in fragmented habitat. Allozyme data for A. californica indicate high levels of genetic variability. Nei's genetic identity and...