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Full-Text Articles in Biology
Using Linear Mixed Models To Analyze Native And Non-Native Species Abundances In Coastal Sage Scrub, Kaylee Anderson
Using Linear Mixed Models To Analyze Native And Non-Native Species Abundances In Coastal Sage Scrub, Kaylee Anderson
Scripps Senior Theses
Coastal Sage Scrub (CSS) is a low scrubland plant community native to the coasts of California, housing many threatened and endangered species. Due to the invasion of non-native plants, many areas of CSS have type converted to annual grasslands and the fire frequency has accelerated; fire in turn, may facilitate further invasion, leading to a loss of biodiversity. While many studies document post-fire succession in these communities, pre-fire data are rarely available for comparison, especially data on seedling emergence. I analyzed post-fire recovery of a type-converted grassland community, comparing seedling emergence data for the first and third year after fire …
The Effects Of Invasive Grasses On The Survival And Germination Of Native Forbs, Rachel A. King
The Effects Of Invasive Grasses On The Survival And Germination Of Native Forbs, Rachel A. King
Scripps Senior Theses
Invasive species are an increasingly severe conservation problem that can dramatically alter native plant communities. Although ecologists have proposed many mechanisms for the dominance of invasive species, superior competitive ability is one of the longest standing hypotheses. In winter annual plant communities, germination timing affects competition among plants. I hypothesized that grass invasion has changed the costs and benefits of early and late germination, and that species with flexible germination timing would compete better with invasives. Experiments at the Bernard Field Station in Claremont, CA and germinator trials in a controlled environment were used to examine the survivorship and germination …