Joanna Masel
joannamasel.bsky.social
Joanna Masel
@joannamasel.bsky.social
Theoretical biologist and advisor to data scientists at the University of Arizona. Mostly theoretical population genetics and molecular evolution, but I've also published in biochemistry, infectious disease, aging, economics, education. Opinions are my own
Tilman posited that apparently low-density environments (where Grime let ruderals succeed) had larger territories, with resources still exploited down to the lowest tolerated level. We support Grime’s view, by highlighting that resource levels need not be so low en.wikipedia.org/wiki/Univers... 9/9
Universal adaptive strategy theory - Wikipedia
en.wikipedia.org
September 16, 2025 at 5:37 PM
In previous work, we tackled different ways of competing over territories, i.e. durable resources doi.org/10.1016/j.tp.... Our current work addresses consumable resources. Both can be seen as formalizations of Grime’s ruderals vs competitors vs colonizers. 8/9
Redirecting
doi.org
September 16, 2025 at 5:36 PM
The same difference in exploitative ability yields more coexistence when created by search speed differences than via handling times. 7/9
September 16, 2025 at 5:36 PM
Faster search yields more opportunities to interfere, and faster handling yields fewer opportunities to be interfered with. This mechanistic connection between exploitative and interference abilities is core to our results, and how they differ from past work. 6/9
September 16, 2025 at 5:35 PM
Other parameters yield the “dominance-discovery” trade-off described in ants, where the Dove loses at contests but is better at finding new resources. We also find a new “Dove-discovery” trade-off, where Hawks search better, but the opportunity costs from contests is too high. 5/9
September 16, 2025 at 5:35 PM
Some parameter choices yield something like the Hawk-Dove game, with a trade-off between the benefits of interfering with the other type and the costs of interfering with one’s own type. The Hawk’s cost need not be direct – an opportunity cost from time spent fighting is enough. 4/9
September 16, 2025 at 5:34 PM
We develop a mechanistic model in which consuming a resource takes time, and Handlers can be interrupted by Searchers who find them rather than free Resource. This initiates a Contest, distracting the consumers, thus allowing the resource to grow to higher levels. 3/9
September 16, 2025 at 5:34 PM
R* theory assumes no direct interactions at the same trophic level, and that resources are consumed down to the level at which only one species can persist. en.wikipedia.org/wiki/R*_rule... 2/9
R* rule (ecology) - Wikipedia
en.wikipedia.org
September 16, 2025 at 5:33 PM
I think the strongest evidence for pervasive adaptive substitutions comes from @denard.bsky.social eg elifesciences.org/articles/12469 and subsequent work. The reason is pathogens, although other arms races might contribute.
Viruses are a dominant driver of protein adaptation in mammals
Viruses drive adaptation at the scale of the whole proteome and not only in antiviral proteins in mammalian hosts.
elifesciences.org
August 5, 2025 at 2:59 AM
I think there is a drift barrier in all cases. But allele frequencies trajectories are different, affecting the site frequency spectrum. We found that the Ne reduction stems from interactions between beneficial and deleterious alleles: bsky.app/profile/joan...
August 5, 2025 at 2:55 AM
Whoops, I just realized what you were pointing to. I was quoting @nicolasgaltier.bsky.social that time. It's really about the effects of sites that the focal allele is in LD with: either fewer of them and linked, or potentially weakly the whole genome.
August 5, 2025 at 2:49 AM
Also, I think what I wrote about linked selection in that thread was a direct quote from the authors.
August 5, 2025 at 2:47 AM