Tom Iwanicki
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iwanicki.bsky.social
Tom Iwanicki
@iwanicki.bsky.social
Visual ecologist studying light and vision on the high seas. Opinions my own.

🐟🪼🐦

tomiwanicki.com
Wow. People are way too chill around an active & uncontained fire in the building they're standing in.
November 20, 2025 at 5:57 PM
The comet looking thing is in fact a comet, very cool how many assets were brought to bear to confirm that fact
November 19, 2025 at 8:17 PM
Come to the sea surface. We got beautiful violet colored snails that cling for dear life onto a bubble raft of their own snot, too
November 19, 2025 at 3:23 PM
A gorgeous wee righty 🥹
November 12, 2025 at 5:13 AM
By The Wind sounds like an Oscars bait feature film from the 90s I love it
November 12, 2025 at 12:00 AM
Thanks Trevor, hope it was worth the wait
November 11, 2025 at 8:47 PM
Stunning! I lived on Van Island for a time, it is near and dear. You caught a lot of lefties from the looks of it thanks for sharing
November 11, 2025 at 4:07 AM
Thanks for your note! We have an update that I hope answers your question ☺️ bsky.app/profile/iwan...
In our last thread, we left the jelly-enjoyers of Bluesky with a cliff hanger ending, in what one eager onlooker described as soap opera science 😜 ... wait no more, we are back! Grab your popcorn shrimp and come with us on a journey spanning more than...

bsky.app/profile/iwan...
Kailua Beach, Hawai’i: The first time I laid eyes on a By-the-wind sailor, I stopped dead in my tracks, dusted the sand off my hands, grabbed my iphone and...
November 10, 2025 at 10:17 PM
We have an update! bsky.app/profile/iwan...
November 10, 2025 at 10:16 PM
Using participatory & traditional science we robustly support Savilov’s hypothesis that a mirrored trait plays a key role in the global distribution of By-the-wind sailor. This will help elucidate patterns in the community of animals floating on our high sea surface

www.biorxiv.org/content/10.1...
www.biorxiv.org
November 10, 2025 at 10:13 PM
But are they really By-the-”WIND”? We looked at the coast of Portugal which experienced episodic strandings of lefties and righties. Under wind conditions where we predict more left- or right-handed sailor strandings, we did in fact observe that, so the wind is the likely culprit. So, altogether...
November 10, 2025 at 10:13 PM
We used genetics to test whether lefties and righties are members of the same species and/or distinct populations. When comparing lefties and righties that found together on the North Carolina coast & lefties from Monterey Bay California, we found that sail direction came from a mixed population...
November 10, 2025 at 10:13 PM
Answer this age-old question. Using ~11,000 photos from @inaturalist.bsky.social and 300 samples in the North Pacific Subtropical Gyre from two sea-going expeditions, we found proportionally more lefties ashore in the North, more righties in the South, and righties concentrated inside the gyre...
November 10, 2025 at 10:13 PM
Until the trail ran dry... R. Bieri saw merit in A.I. Savilov’s hypothesis, but because data was scarce (& the high seas are hard to study!) he concluded that the mystery remained. Now decades later, we combined community (citizen) science with advances in genetics and oceanography to...
November 10, 2025 at 10:13 PM
Savilov thought that in the Northern Hemisphere, left-handed sailors would be blown outside of gyres toward the coastline and right-handed sailors would concentrate inside gyres; the opposite being true in the Southern Hemisphere. Through the 1960s...
November 10, 2025 at 10:13 PM
By-the-wind sailor are a spiraling mystery. They have a fleshy rigid sail that points to the left or right. Lefties go left and righties go right relative to the wind. This led a Soviet scientist, A.I. Savilov, to predict that sail direction had something to do with their global distribution...
November 10, 2025 at 10:13 PM
100 years! By-the-wind sailor, or Velella velella, have dazzled and perplexed beachgoers for ages. Their episodic strandings on beaches around the globe bring a high seas mystery and a potpourri of ocean stink, as immortalized in this account from April, 1902 in the journal Nature...
November 10, 2025 at 10:13 PM
High praise!!! Thanks Marina 🥹
November 11, 2025 at 12:27 AM
Thanks Jim! It is with radical optimism that we keep poking and prodding at the mysteries of the beautiful blue planet
November 11, 2025 at 12:25 AM