parviflora, an annual, spring plant does not appear to germinate in time to be suitable for Taylor's checkerspot post-diapause larval feeding (manuscript in prep.
Germination ecology of Collinsia verna, a winter annual of rich deciduous woodlands.
Variable selection on the timing of germination in Collinsia verna (Scrophulariaceae).
Opportunistic species (Cirsium arvense, Collinsia
parviflora, Gayophytum diffusum, and Lactuca serriola), which frequently were sparse at individual sampling points, were sampled along 1 m wide belt transects between sampling points.
is pollinated by bumblebees, honey bees, and other bees.
In outcrops it was a perennial lousewort, Pedicularis semibarbata, and in clearings it was a small spring annual, Collinsia
torreyi (both are Scrophulariaceae).
Nevertheless, the decrease observed in germination is much higher than that found in Collinsia
heterophylla, a species with a lower outcrossing rate than P.
For example, Kalisz (1991) found that the probability of Collinsia
verna seeds persisting and emerging from the soil seed bank was significantly affected by spatial and temporal environmental variation, and that seedlings emerged significantly later out of experimental seed banks containing older seeds than adjacent unmanipulated seed banks.
Effects of seed parent on sequential life cycle traits were also diluted in greenhouse-raised Raphanus sativus (Marshall and Whittaker 1989), but not in greenhouse-raised Collinsia
verna (Kalisz 1989).
Am] for seed mass and other traits in Collinsia
Fitness consequences of mating system, seed weight, emergence date in winter annual, Collinsia
For example, without regard to statistical significance, coefficients of variation of selfed progeny exceeded those of outcrossed in two of four traits examined in Collinsia
verna (Kalisz 1989); in three of four traits in Begonia hirsuta and in all four traits in B.
For example, a study of the self-compatible annual Collinsia
verna found that directional selection acted on the timing of germination (Kalisz 1986), a trait which has been shown to exhibit inbreeding depression (Kalisz 1989).
We chose the genus Collinsia
for study because breeding systems of species in this genus have been stated to range from inbreeding to outbreeding (Garber 1956, 1974).
Three species (Clarkia tembloriensis, Collinsia
heterophylla, and Eichhornia paniculata) were represented three times in the sample because, for these taxa, inbreeding depression estimates were available for populations with markedly different mating systems.