By Mary Allessio Leck (Eds.)
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Additional resources for Ecology of Soil Seed Banks
Example text
Differences in damage among individuals or between species can be significant even where the magnitude of the loss is small (Fox and Mor row, 1986). Clearly, seed predation can matter. However, clear-cut generalizations for when and where seed preda tion actually does have a major influence have been difficult to make (Harper, 1977). The descriptive data required to compare seed predation intensities among plant communities are far from complete. The com parative, experimental data that are necessary to determine the general contribution of seed predation to the dynamics and evolution of plant regeneration from seed are uncommon (Harper, 1977; Crawley, 1983, 1988a; Fenner, 1985).
1962), working with Striga asiatica, claimed that coumarin derivatives were active, but Cook et al. (1972) identified a stimulant as a lactone. Indeed, there are probably many stimulants from different host plants. Sunderland (1960) concluded that a variety of chemicals could produce the effect, sometimes with synergistic actions, in both Orobanche minor and Striga. Orobanche minor has an apparently almost unlimited range of host plants. However, the closely related Orobanche hederae is restricted to Hedera helix.
Instead, these species could be called "resource speculators," the species that invest in a strategy with high potential for rapid resource gains in changing environments but also with high risks. , Louda, 1982b, 1983). E. Consumers throughout the Life Cycle Affect Seed Dynam ics Finally, the data suggest that the consequences of seed loss are deter mined by the influence of the biotic and physical environment on plant performance and compensatory ability.