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DTSTAMP:20260921T131719
DTSTART;TZID=America/Detroit:20261009T153000
DTEND;TZID=America/Detroit:20261009T163000
SUMMARY:Lecture / Discussion:Smith Lecture: Maya Samuels-Fair
DESCRIPTION:Selective extinction by definition causes some groups to become extinct at higher rates than others and is often assumed to be the cause of functional diversity changes following mass extinctions. However\, significant changes in functional diversity can occur even when extinction is nonselective (random). Counterintuitively\, lack of functional diversity change can also be evidence of selective extinction. This can occur because (1) the number of taxa in each functional group varies and (2) the abundance of each functional group varies. Consequently\, random removal of taxa or individuals disproportionately affects rare functional groups. We simulate random extinction with a range of initial rank abundance distributions\, varying the number of taxa in each functional group and the evenness of abundances across taxa. We then measure change in functional diversity before and after random extinction using PERMANOVA. This generates a null distribution of how functional diversity would be expected to change under random extinction for each initial rank abundance distribution. Change in functional diversity outside the null distribution is then positive evidence of nonrandom extinction\, nonrandom origination\, or nonrandom changes in abundance. \n \nWe apply this approach to examine changes in the bryozoan fauna of Stevns Klint\, Denmark following the Cretaceous-Paleogene mass extinction\, using a dataset of 4\,453 specimens from 13 pre-extinction and 7 post-extinction samples. We find that functional diversity changes significantly across the K/Pg boundary\, but functional change is largely consistent with random extinction\, followed by an increase in the abundances of the functional groups with the fewest taxa. Our approach thus allows us to differentiate between selection extinction and other mechanisms of functional diversity change\, which can be applied to other extinction events.
UID:152565-21913921@events.umich.edu
URL:https://events.umich.edu/event/152565
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Earth And Environmental Sciences
LOCATION:1100 North University Building - 1528
CONTACT:
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DTSTAMP:20261009T152114
DTSTART;TZID=America/Detroit:20261009T154500
DTEND;TZID=America/Detroit:20261009T170000
SUMMARY:Workshop / Seminar:Place as Method\, Theory\, and Responsibility: Rethinking Scientific Inquiry for Complex Social Issues
DESCRIPTION:The challenge: New data and approaches to study complexity in the social world has often been without a concurrent focus on the foundations of scientific inquiry\, including complex thinking\, broad causal thinking\, attention to epistemic lens\, and integrating multiple disciplinary approaches. Further\, the academic research model\, with its resource-segregated networks\, discipline-specific training\, and short-term productivity metrics\, contributes to a fragmented and potentially misleading understanding of the social world. In the second annual ISR Symposium on Complexity in the Social World\, we will use ‘place’ as the case study to facilitate discussions on rigorous social science in the public interest.Using research on place as the case study\, discussion topics will include:Complex thinking about the social worldThe contribution of the humanities the study of the social worldEpistemic lens and research transparencyTheories\, frameworks\, and the limits of traditional causal inferenceThe draw and danger of cool new dataAddressing the challenges of the academic model of sciencePresentations on the science of place will include:The relational nature of place in population social inequalitiesThe role of history in shaping placeThe racialization of place\; the spatialization of racePlace as a neutral and rational driver of social inequalitiesApproaches to testing (causal) ideas around place
UID:149491-21906518@events.umich.edu
URL:https://events.umich.edu/event/149491
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Sessions
LOCATION:Room 1430, Institute for Social Research
CONTACT:
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