Klemow, Kenneth M. 1986. PATTERNS OF JUVENILE SURVIVAL AMONG HERBS COLONIZING AN ABANDONED LIMESTONE QUARRY: A TEST OF LIFE-HISTORY THEORY. Contributed paper: Fourth International Congress of Ecology. Abstract: Program of the Fourth International Congress of Ecology: 203.
Theoretical studies often predict that iteroparous (polycarpic) species should have lower juvenile survival than semelparous (monocarpic) species. Among herbaceous plants colonizing an abandoned limestone quarry located near Syracuse, seedlings of the polycarpic Asclepias tuberosa actually had greater survival than those of three co-occurring monocarpic species. Instead, the survival of seeds was much lower for Asclepias than for the monocarps. As a result, very few Asclepias seedlings emerged, compared with the monocarps. In this study, seedling emergence and survival of three additional polycarpic species (Hieracium florentinum, Hypericum perforatum, and Chrysanthemum leucanthemum) were examined for six years to determine whether the patterns observed for Asclepias were representative of the polycarps in general. Unlike Asclepias, seedlings of the three polycarps were about as abundant as those of the monocarps. However, seedling survival of the polycarps was appreciably lower than that of the monocarps, thus supporting life-history predictions.