Dear Members of the Zoological Society of Japan

We are writing to inform you that member Daiki Sato has requested the distribution of a direct mail.
Zoological Society of Japan Secretariat

From here
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Dear Members of the Zoological Society

Thank you for your continued support. I am Daiki Sato from Chiba University.
Here is the announcement for the upcoming 47th Digital Evolutionary Biology Seminar (Online).

July 4 (Fri) 15:00- To Dr. Tatsuki Nagasawa (Institute of Science Tokyo)
Acquisition of diversity in reproductive modes of fishes and the evolutionary dead ends seen behind it
Under this title, we will discuss the molecular evolution of strategies for protecting eggs.
He is scheduled to give a presentation centering on his latest achievements, which were also announced in a press release the other day.
https://www.isct.ac.jp/ja/news/y89gj0lh34jp

If you wish to participate, please register from "Participation Application" on the homepage.
https://digitalevosemi.jimdofree.com
I would appreciate it if you could spread the word to anyone nearby who might be interested.

Also, a limited-time catch-up broadcast of Dr. Risa Kawaguchi's 46th talk on the fluctuations of quadruplet armadillos is now available.
Please register using the link at the bottom of the homepage.
https://digitalevosemi.jimdofree.com/

We sincerely look forward to your participation.
I look forward to working with you.

We are looking for new members to join our management team. To ensure the continuous operation moving forward, we welcome those who can commit for about a year.
This email address, or Mitsuhiko Sato (mitsuhikoevolution@gmail.comPlease contact ) directly.
We are attempting to make announcements via Google Groups to improve operational efficiency. If you no longer wish to receive them, please unsubscribe by following the instructions at the bottom of the email.

—Details below—————————————————
Friday, July 4, 2025, 15:00 - (JST)
Dr. Tatsuki Nagasawa (Assistant Professor, School of Life Science and Technology, Institute of Science Tokyo)
Acquisition of diversity in reproductive modes of fishes and the evolutionary dead ends seen behind it

Abstract
The hydrosphere, which covers over 70% of the Earth's surface, contains diverse environments that differ in temperature, salinity, depth, and other factors. Adapting to these environments, fishes have undergone explosive adaptive radiation. With over 30,000 known species, they represent the most successful lineage, comprising more than half of all vertebrates. In response to diverse habitats, fishes have also diversified their reproductive strategies, exhibiting a wide range of approaches from non-guarding, high-fecundity strategies to egg-guarding by parents. To elucidate the molecular basis supporting the adaptation of fishes to reproductive niches, the presenters have thus far conducted research using various fish species and incorporating diverse methodologies. In this presentation, we will first introduce the co-evolutionary process of the egg envelope and hatching in fishes. Next, we plan to discuss the possibility that, despite the diversification of reproductive strategies, the egg-guarding strategy may actually be caught in an "evolutionary dead-end" from the perspectives of gene loss and functional disruption.

References
T. Nagasawa et al. (2025) Convergent evolutionary dead-end and breakdown of hard chorion in parental-egg-care fish reproductive strategies. Molecular Ecology https://onlinelibrary.wiley.com/doi/10.1111/mec.17816?af=R
T. Nagasawa et al. (2022) Molecular evolution of hatching enzymes and their paralogous genes in vertebrates. BMC Ecology and evolution https://bmcecolevol.biomedcentral.com/articles/10.1186/s12862-022-01966-2
T. Nagasawa et al. (2015) Sturgeon hatching enzyme and the mechanism of egg envelope digestion: Insight into changes in the mechanism of egg envelope digestion during the evolution of ray-finned fish. J. Experimental Zoology part B https://onlinelibrary.wiley.com/doi/10.1002/jez.b.22660

—Details up to here—
Home page
https://digitalevosemi.jimdofree.com/
YouTube channel
https://www.youtube.com/channel/UCiDIb4BZk9hurYkloI_obNA
X account
@DigitalEvoSemi
Bluesky account
https://bsky.app/profile/digishin.bsky.social
LINE Official Account
https://lin.ee/KHgsFCa
Instagram account
https://www.instagram.com/digi_shin/
TikTok account
https://www.tiktok.com/@digitalevosemi?
note account
https://note.com/digi_shin
Threads account
https://www.threads.net/@digi_shin

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Digital Evolutionary Biology Seminar
Mitsuhiko P. Sato
Kazusa DNA Research Institute

Daiki X. Sato
Chiba University

Wakamiya Takeshi
Institute of Science Tokyo

Takahisa Ueno
National Institute of Genetics
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