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SUMMARY:Biological Sciences Colloquium: Professor Nathan Muchhala
DESCRIPTION:Professor Nathan Muchhala\, Univ of Missouri-St. Louis\, will present a talk about his work entitled “Bats & Flowers: a coevolutionary romance“.  \nDr. Muchhala is internationally recognized for his innovative research exploring how plant-pollinator mutualism and interspecific competition structure communities.   His experimental work on bat and hummingbird pollination in Columbia and Ecuador combines elegant field studies of pollination dynamics with molecular phylogenies to explore pre- and post-zygotic reproductive barriers.   His team has also investigated how different groups of pollinators influence patterns of pollen dispersal and gene flow.    Some representative reprints are attached.  Here is a link to his web site:  https://www.umsl.edu/~muchhalan/index.html.\n\n\nThe presentation will begin at 3:00 PM in Lapham Hall N101\, preceded by an informal reception from 2:45 – 3:00PM.
URL:https://uwm.edu/biology/event/biological-sciences-colloquium-professor-nathan-muchhala/
LOCATION:Lapham Hall\, N101\, 3209 N Maryland Ave\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/biology/wp-content/uploads/sites/21/2026/10/Muchhala-Fall-2026.jpg
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DTSTART;TZID=America/Chicago:20261016T150000
DTEND;TZID=America/Chicago:20261016T160000
DTSTAMP:20261013T151214Z
CREATED:20261013T151214Z
LAST-MODIFIED:20261013T151214Z
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SUMMARY:Biological Sciences Colloquium: Dr. William C. Beckerson
DESCRIPTION:Dr. William C. Beckerson\, assistant professor of biology at Lake Forest College\, will be presenting a talk about his work entitled “The First of Us: Ophiocordyceps use a novel scramblase-binding peptide to manipulate zombie ants.”  The abstract is as follows: \nParasite-adaptive manipulation of animal behavior is a widespread natural phenomenon\, particularly amongst entomopathogenic fungi. In many cases\, these “zombie making” fungi cause their insect hosts to abandon routine behaviors in favor of summiting and adherence to elevated positions more advantageous for the spread of fungal propagules. Ophiocordyceps zombie fungi are particularly well-known for hijacking the behavior of ants in several conspicuous ways. Infected hosts show signs of disrupted daily rhythms\, abandon their nest and social roles\, climb nearby vegetation\, and bite down anchoring themselves to the substrate. While these extended phenotypes are well described\, functionally characterizing the biomolecules involved in behavior manipulation remains difficult. This is largely due to the recalcitrant nature of working with these non-model organisms in a laboratory environment. Here we demonstrate how model organisms can be used as surrogates for the characterization of these and other behavior effectors. We adopted the powerful genetics toolbox of Caenorhabditis elegans to identify molecular targets and neurophysiological effects of candidate Ophiocordyceps effectors. In doing so\, we discovered a novel cysteine-rich\, small secreted fungal peptide that binds to well-conserved neuronal calcium-dependent scramblase channels\, particularly those associated with sensory tissues. This binding suppressed nematode motor coordination and interfered with dampened ant olfactory systems vital for communication. These findings suggest that Ophiocordyceps scramblase-binding peptide is involved in the disassociation of hosts from their social conspecifics\, demonstrating the neuroethological role of Scramblase-1. We anticipate our strategy will provide a roadmap for future neuroparasitology research in other difficult-to-work-with systems. \nThe presentation will begin at 3:00 PM in Lapham Hall N101\, preceded by an informal reception from 2:45-3:00 PM.
URL:https://uwm.edu/biology/event/biological-sciences-colloquium-dr-william-c-beckerson/
LOCATION:Lapham Hall\, N101\, 3209 N Maryland Ave\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/biology/wp-content/uploads/sites/21/2026/10/Beckerson-Fall-2026.jpg
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