To further explore Foeniculum invasion patterns, I compared trait expression of Mediterranean and California populations in natural field and experimental common environment settings. California Foeniculum populations had larger individuals, with larger seeds, than did Mediterranean populations. When grown together, California and Mediterranean Foeniculum were similar in size, survivorship, percent germination, and specific leaf area (SLA). However, California Foeniculum had higher water-use efficiency (WUE) than did Mediterranean plants. I also recorded individual and population-level responses of Foeniculum to seasonal and latitudinal changes in water availability in California. Foeniculum partially escapes drought stress by accessing deeper soil water and reducing water loss through leaf senescence. I found no change in WUE or SLA across seasons, or evidence of latitudinal clines in either trait, but found a positive correlation between water availability and Foeniculum seed mass. Continued study of invasive species trait variation between and within their native and introduced ranges will help identify the factors that allow and limit species success.In this study, I used a subset of a series of artificially-created native-perennial and exotic-annual dominated plots that have been maintained at this site since 1998, ... Field Colonization Experiment To test the resistance of different vegetation 44.
|Title||:||On the Importance of Plant Phenology and Resource Use in the Invasion of California Coastal Grasslands|
|Author||:||Joel Kwamena Abraham|
|Publisher||:||ProQuest - 2008|