Jacob Tennessen

@jacobphd.bsky.social

Scientist errant. Genetics, evolution, whimsy, awe. https://connects.catalyst.harvard.edu/Profiles/display/Person/173289 🧬🦟🐌🩸👤🦠🍓🐸🧬

When I was a kid, a friend rejected evolution because he equated "mutant" with "diseased" and didn't want to descend from a "sick monkey". But now that "sick" has a positive slang meaning, maybe we should embrace the term. I'm proud to be descended from a sick (complimentary) monkey!

iNaturalist just updated the genus Bison to merge with Bos, as in cattle, reflecting recent genetic analysis and the fact they can readily interbreed. In fact all living American bison are directly descended in part from domestic cattle; the original wild bison is gone, and only Bos hybrids remain.

Bos bison, with sprinkling of Bos taurus, in Yellowstone

Two of the most iconic Pacific Northwest species are the Pacific chorus frog (Pseudacris regilla) and the Douglas fir (Pseudotsuga menziesii). Both are “false” (pseudo-). It’s the land of real organisms with fake names.

Pacific chorus frogDouglas firs

Hello, I am a brain. I crave dopamine above all things. I can freely administer dopamine to myself and I alone control it. However I can only do this according to arbitrary rules I have made up. Sometimes my rules don’t allow me to give myself as much as I want. This is the source of all anguish.

With cyclosporiasis in the news, note that the only treatment is trimethoprim-sulfamethoxazole, an antibiotic, i.e. something that targets bacteria and shouldn’t even work on a eukaryote but somehow sort of does. It will probably evolve resistance, so we need more options tailored to this taxon.

I enjoyed Percival Everett's “James” (Huck Finn from Jim’s viewpoint). Has anyone done this with Kipling’s “Kim” from Teshoo Lama’s view? The two classic novels are very similar, but Twain’s story was already anti-slavery while Kipling’s is pro-colonialism so there is more room to subvert it.

Two separate congressional candidates in my district, one Democrat and one Republican, have hit upon an issue to unify Americans on both sides of the aisle: Aliens. I say we need to rule out whether any organism currently on Earth is an alien, so fund basic biology research and we'll go from there.

Candidate statement about aliensCandidate statement about aliens

Read about cyclosporiasis outbreak? Wondering what exactly is this organism causing an uptick in explosive bathroom visits? Cyclospora is in the Weed clade as I define it here: adaptivediversity.wordpress.com/2026/06/13/t... So think of it alongside malaria parasites, seaweed cousins, and plants. 🪴

The Energetic Branches

I recently attended a parasitology conference, which has me thinking about ancient evolution. A lot of medically important parasites come from far-flung branches in the tree of life, weird groups o…

adaptivediversity.wordpress.com

Three excellent books about fungus I've read this year: 🍄The Mushroom at the End of the World by Anna Lowenhaupt Tsing 🍄How to Change Your Mind: The New Science of Psychedelics by Michael Pollan 🍄Entangled Life: How Fungi Make Our Worlds, Change Our Minds & Shape Our Futures by Merlin Sheldrake

Coincident with the life of Dolly the sheep (1996-2003), cloning was a hot topic infused in the culture. And then abruptly we all decided it’s not actually that worrisome or interesting. Now it’s hard to even explain the earlier obsession to those who didn’t live through it.

Attack of the Clones posterAustin Powers poster (the one with Mini-Me)The 6th Day posterMultiplicity poster

The algae in the Reflecting Pool are mostly Desmodesmus, which happens to be the only chlorophyll-containing organism that can infect and parasitize human flesh. It's not really dangerous, but it's a pretty on-the-nose metaphor that nature is delivering to us. www.nejm.org/doi/10.1056/...

Infection with a Chlorophyllic Eukaryote after a Traumatic Freshwater Injury | NEJM

Infections with chlorophyllic algae are uncommon. Invasive infection with Desmodesmus armatus developed in two patients independently after they each sustained a penetrating freshwater injury.

nejm.org