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DTSTART;TZID=America/Los_Angeles:20260513T120000
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SUMMARY:Between Forest and City: Stable Isotope Evidence for Anthropogenic Impacts on the Dietary Ecology of the Vulnerable Wied’s Marmosets in Brazil
DESCRIPTION:Archaeology and Biological Anthropology Lunch Talk with Letícia Soto da Costa — May 13th at 12 noon in Rm 261\, Social Sciences 1. \nAbout the talk: Anthropogenic disturbance is a major driver of environmental change\, altering resource availability and the feeding ecology of primates\, particularly in rapidly changing tropical landscapes. The vulnerable Wied’s marmoset (Callithrix kuhlii)\, endemic to the Brazilian Atlantic Forest\, inhabits increasingly human-modified environments. However\, how these changes affect its feeding ecology remains understood. Here\, we used carbon (d13C) and nitrogen (d15N) stable isotope analyses to investigate the dietary ecology of free-ranging Wied’s marmoset populations across 14 municipalities representing a gradient of human-modified landscapes in southern Bahia\, Brazil. We analyzed hair samples from 107 individuals across 30 social groups\, alongside isotopic data from potential dietary resources. Our findings reveal that both d13C and d15N values were negatively associated with forest cover\, with individuals in less forested sites exhibiting higher isotopic values. While mixing models indicated that fruit and insects were the main dietary components\, although their relative contributions varied spatially. Populations in more forested sites showed higher fruit consumption\, whereas those in less forested areas relied more heavily on insects and potentially additional\, unaccounted food resources. We also found age-related differences in d13C values\, suggesting variation in resource use across life stages. These findings indicate that C. kuhlii exhibits dietary flexibility in response to human-modified landscapes and resource availability\, while highlighting the importance of forest cover in maintaining natural feeding patterns. \nAbout the presenter: Letícia Soto da Costa is a PhD student in Ecology and Conservation Biology at the Universidade Estadual de Santa Cruz (Bahia\, Brazil)\, under the supervision of Dr. Ricardo S. Bovendorp. Her research focuses on the impacts of anthropogenic pollutants on Wied’s Marmosets (Callithrix kuhlii) in the Brazilian Atlantic Forest of Bahia through heavy metal and stable isotope analysis. During AY 2025-26\, she has been a Visiting Researcher in the PEMA Lab under the mentorship of Prof. Vicky Oelze and funded by the Brazilian government as a CAPES Visiting PhD Scholar.
URL:https://events.ucsc.edu/event/between-forest-and-city-stable-isotope-evidence-for-anthropogenic-impacts-on-the-dietary-ecology-of-the-vulnerable-wieds-marmosets-in-brazil/
LOCATION:Social Sciences 1\, Social Sciences 1\, Santa Cruz\, CA\, 95064
CATEGORIES:Lectures & Presentations,Ph.D. Presentations
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