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2018 Biology Honors Presentation

Species distribution models, which use bioclimatic variables to map the current range of a species, are frequently projected into the future to predict how a species’ range will shift under environmental change. Maintaining accurate and up-to-date current and future species distribution models is important to identify potential regional extinctions, conservation sites, and implications for ecosystems. As California’s largest oak, Quercus lobata Née (valley oak) is of particular significance as a keystone species in oak ecosystems.

Dr. Shannon J. Sirk ‘01 - Engineering Commensal Microbes

The human body is a complex ecosystem supporting symbiotic relationships with thousands of microbial species. By some estimates, human commensal microbial cells outnumber human cells by a factor of ten and harbor three hundred times as many protein coding genes. Such symbiotic microorganisms are integral to the health and metabolism of not only humans, but also animals, insects, and plants.

Andrea Bonisoli-Alquati - Oxidative stress and life history: Ecological and evolutionary lessons from nuclear accidents

Exposure to ionizing radiation can imbalance the antioxidant system, inducing oxidative stress. The oxidative status of an organism is increasingly regarded as the currency underlying life history trade-offs, such as the one between survival and reproduction. Landscape-level radioactive contamination can thus function as a natural laboratory where to investigate the nexus between life-history and physiology.