Evolution and Ecology of Species Range Limits
Range edges are characterized by increased genetic isolation, genetic differentiation, and variability in individual and population performance, but evidence for decreased abundance and fitness is lacking, and a better fusion of experimentation and theory will advance understanding of the causes of range limits.
“How Local Is Local?”—A Review of Practical and Conceptual Issues in the Genetics of Restoration
This work focuses on genetic concerns arising from ongoing restoration efforts, where often little is known about “How local is local?” (i.e., the geographic or environmental scale over which plant species are adapted).
SPATIAL HETEROGENEITY EXPLAINS THE SCALE DEPENDENCE OF THE NATIVE-EXOTIC DIVERSITY RELATIONSHIP
- K. Davies, P. Chesson, S. Harrison, B. Inouye, B. Melbourne, K. Rice
- Environmental Science
- 1 June 2005
While small-scale studies show that more diverse native communities are less invasible by exotics, studies at large spatial scales often find positive correlations between native and exotic…
Restoration Biology: A Population Biology Perspective
Five research areas of particular importance to restoration biology that offer potentially unique opportunities to couple basic research with the practical needs of restorationists are discussed.
Managing microevolution: restoration in the face of global change
The genetic and demographic properties that influence the ability of populations to adapt to rapidly changing selective pressures are reviewed and ways in which restoration biologists can manipulate the genetic architecture of target populations to increase their ability to adaptto changing conditions are suggested.
Effects of Competition on Resource Availability and Growth of a California Bunchgrass
Increased competition for light during the spring, when growth of annuals is most rapid, suppresses growth and reproduction of Nassella pulchra and suggests that the dominance of California grasslands by nonnative annual vegetation has shifted the primary limiting resource from soil moisture to light and the timing of resource limitation from summer to winter and spring.
Invasive California poppies (Eschscholzia californica Cham.) grow larger than native individuals under reduced competition
The results indicate that genetic shifts in traits have occurred in invasive populations, and that the invasive plants are better at maximizing growth and reproduction in open environments.
Genetic Structure and Gene Flow in Elymus glaucus (blue wildrye): Implications for Native Grassland Restoration
Investigating the genetic structure within and among populations of Elymus glaucus in order to make some preliminary recommendations for the transfer and use of this species in revegetation and restoration projects found limited gene flow in E. glaucus can facilitate the divergence of populations over relatively small spatial scales.
Patterns of tree dieback in Queensland, Australia: the importance of drought stress and the role of resistance to cavitation
Although predawn and midday water potentials for ironbark adults and saplings were similar, a census of mature and juvenile ironbarks indicated that mortality was higher in adult trees, and Cavitation vulnerability curves indicated thatIronbark saplings may be better buffered against cavitation than adult trees.
Patterns of Growth and Soil-water Utilization in some Exotic Annuals and Native Perennial Bunchgrasses of California
Abstract In western California, exotic cool-season annuals appear to have widely replaced native perennial bunchgrasses as the herbaceous community dominants in grasslands, oak savannas, and oak…