Simone
Subedi
Sponsor: Thomas Coombs-Hahn, Ph.D. Ag Neurobiology, Phys & Behav Large-scale wildfires are catastrophic disturbance events that not only threaten organisms' immediate survival but lead to prolonged habitat changes, such as resource exhaustion and ecological community disruption. In this study, we sought to investigate how Dark-eyed Juncos (Junco hyemalis) in post- wildfire habitats might possess differences in behavior, physiology, and morphology compared to those from undisturbed habitats. Dark-eyed juncos are generalists and are able to settle in burnt coniferous forests shortly after a fire. In burnt and unburnt forests, we conducted playback experiments on male juncos by playing conspecific male song recordings to them and counting the number of aggressive responses (e.g., songs, swoops, etc.) they gave. The birds' fecal samples (awaiting analysis results) and body measurements were also collected. Our findings showed that male dark-eyed juncos in post-fire areas were significantly more aggressive towards the playback recording than those in undisturbed areas. However, there were no differences in morphological body measurements, such as body size and plumage, between juncos from the two habitats. Ongoing research will seek to investigate whether the elevated aggression is induced by the burnt environment or is because more aggressive birds prefer burnt habitats when establishing territories. Associations of Marital Status and Depressive Symptoms Among the Oldest-Old Population
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Simone Subedi
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Previous studies investigating relationships between marital status and depression suggest that married individuals often report lower levels of depression compared to their unmarried counterparts. This association is important for older adult populations who are at risk for depression due to social isolation and loneliness which may be exacerbated by spousal loss. Research within the oldest-old, ages 90+, remains limited. We investigated proportions of marital status and depressive symptoms in a cohort of individuals aged 90 and older in the Life After 90 Study. Participants self-reported marital status (widowed, married, separated, never married). Depressive symptoms were assessed using the Geriatric Depression Scale with categories of no, mild, or moderate/severe depression. Of 647 participants (mean age 92.4±2.3), 23% reported mild depression and 4% moderate/severe. Widowed participants were overrepresented among those with mild depressive symptoms (69% vs 60% overall). Separated participants were overrepresented among those with moderate/severe depressive symptoms (13% vs 9% overall). Those with mild (77%) or moderate/severe (67%) symptoms were less likely to report having a confidante compared to those without depressive symptoms (82%). Understanding depression and marital status may help in identifying those in need of emotional or social support in among oldest-old populations. UC Davis 35 th Annual Undergraduate Research, Scholarship and Creative Activities Conference 225 Attribute Perception in Hiring Scenarios kaavya subramaniam
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UC Davis / MED: Neurology / 2024
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Simone Subedi