1 October 2013 Influence of Seed Characteristics and Site Conditions on Establishment of the Threatened Prairie Milkweed Asclepias meadii
Steven M. Roels
Author Affiliations +

Population restoration and reintroduction are critical aspects of many plant conservation efforts. However, factors affecting the earliest life stages, critical to the establishment of new individuals, are often poorly understood. I investigated the influence of seed characteristics and manipulations of the field environment on seedling emergence and growth in Asclepias meadii (Mead's milkweed), a federally threatened tallgrass prairie species. Seeds of known mass and maternal plant were reared in a greenhouse and also in experimental restoration plots with combinations of pre- planting soil disturbance and spring burning treatments. In both the greenhouse and field, seed mass was positively correlated with emergence but not growth. Maternal relationships with emergence and growth were observed in the greenhouse but were generally undetectable in the field. Lower emergence was associated with field plot soil disturbance and burning, although there was no statistically significant effect of either treatment. Seedling growth did not appear to be affected by soil disturbance, but burning had a significant negative effect. Mass may be a useful metric for evaluating restoration seed stocks and the quality of seeds produced in maturing restoration populations. Pre-emergence manipulations of the restoration site did not facilitate emergence or growth and may have even been detrimental to restoration efforts. High survivorship of seedlings during their first year of growth and overwintering suggests that direct sowing of seeds into the field is an effective restoration technique for A. meadii.

2013, American Midland Naturalist
Steven M. Roels "Influence of Seed Characteristics and Site Conditions on Establishment of the Threatened Prairie Milkweed Asclepias meadii," The American Midland Naturalist 170(2), 370-381, (1 October 2013). https://doi.org/10.1674/0003-0031-170.2.370
Received: 20 February 2012; Accepted: 1 June 2013; Published: 1 October 2013
Get copyright permission
Back to Top