Ichiro Matsuzaki

My Chinese friends' paper is just out!

Tang H et al. (2026) Effects of winter heatwaves on carbon dioxide and methane emissions from shallow lakes: A temperature-controlled mesocosm study. Journal of Hydrology 665:134704.

www.sciencedirect.com/science/arti...

What determines trophic niche breadth? A global analysis of freshwater fishes using isospaces - Reviews in Fish Biology and Fisheries Understanding the factors shaping trophic niche breadth is crucial for predicting species interactions, community assembly, and ecological responses to environmental change. Several hypotheses have be...

Fred's paper is just out!
It includes our fish isotopic data of Lake Kasumigaura.

Keppeler FW et al. 2026. What determines trophic niche breadth? A global analysis of freshwater fishes using isospaces. Rev Fish Biol Fisheries 36. doi.org/10.1007/s111...

🌟 New Research - "Our study reveals that brook charr adopt distinct “warm” and “cool” behavioural tactics to balance foraging and thermal stress in stratified lakes"

📖 Read the full paper here➡️ buff.ly/I9VeUeP

Good morning! I’m about to get on the fisherman’s boat to survey fish in Lake Kasumigaura. It’s chilly but very calm.

Graphical abstract: We present the Global Fish Invasions Database (GFID), the first standardized, comprehensive global dataset of 1536 established non-native fish species across 193 countries. GFID includes detailed metadata on introduction pathways, habitat types, native biogeographic realms, and documented ecological, economic, and social impacts. This open-access resource provides a critical foundation for advancing invasion science, informing conservation strategies, and guiding evidence-based biosecurity policy worldwide.

<DATA ARTICLE> #OpenAccess
GFID: A Global Fish Invasion Database

Phillip J. Haubrock et al, @skatsanevakis.bsky.socia
doi.org/10.1111/1440...

aquatic ecosystems/ biogeography/ biological invasion/ global database/ invasive species

The #25DaysofFishmas calendar with the Christmas darter on Day 1

🎶It’s beginning to look a lot like #Fishmas🎶

There’s no better fish to kick off this year’s #25DaysofFishmas than the aptly-named Christmas darter (Etheostoma hopkinsi)! We get our road trip started down in the southeastern US with this small species of fish who has big holiday spirit all year long

Today’s Lake Kasumigaura!

eDNAmap: A Metabarcoding Web Tool for Comparing Marine Biodiversity, With Special Reference to Teleost Fish Marine environmental DNA (eDNA) metabarcoding data are beginning to accumulate, even for remote and poorly studied areas, such as marine environments. These data enable us to identify distributions o...

Shin-Ichiro (Ichiro) Matsuzaki
Input from new study.

Inoue et a. 2025. eDNAmap: A Metabarcoding Web Tool for Comparing Marine Biodiversity, With Special Reference to Teleost Fish. Molecular Ecology Resources

onlinelibrary.wiley.com/doi/10.1111/...

Input from new study.

Vagnon et al. 2025. Experimental Evidence for the Desynchronization of Ecosystem Dynamics by Global Change. Ecology Letters

onlinelibrary.wiley.com/doi/10.1111/...

I’m using right away the coffee mag that I bought at Trident Cafe in Boulder, CO. www.tridentcafe.com

This is so cool to me because the top of “trident” like a fork is very similar to a Japanese Kanji, 山, which means a mountain. I appreciate this realization.

Trident cafe is must-visit cafe!

Today is the monthly monitoring of Lake Kasumigaura. It’s pretty nice weather.

Zooplankton team! It’s wonderful folks helping each other and fixing together if someone hits a wall. This pic was a dinner at Tea House, an iconic restaurant of Boulder, CO. Thank you everyone and @cu-esiil.bsky.social kind support!

Just touched down at Tokyo Airport. At the Denver airport, 2hrs after boarding on time, all passengers had to get off the plane due to mechanical issues. It was my first time getting a meal voucher. After grabbing a coffee for 1h, I boarded again. I’m happy I made it back safely.

If you visit Boulder, CO, you should stop by Piece Love and Chocolate.
It’s so nice atmosphere and many delicious chocolates!

pieceloveandchocolate.com

I grabbed a hot coco with marshmallow. It was sooooo nice! I also got some dark chocolates for a gift.

@mishafredmeyer.bsky.social @rmpilla.bsky.social @dvm-uvm.bsky.social @csymons.bsky.social @annaschmidt.bsky.social

We are a member of FreshwaterH2O of @cu-esiil.bsky.social. We made the projects forward through team building, working together, and many discussions. We sometimes create dataset, analyze data, discuss the results, go hiking, and grab chocolate. This week was so productive!

It’s time to leave for Denver, Colorado, to join the zooplankton workshop funded by ESIIL @cu-esiil.bsky.social.

Input from new study

Hannah Barrett, Jonathan Armstrong (2025) Alternative energetic strategies for a cold-water fish: Gains in the mainstem versus efficiency in floodplain refuges. J. Animal Ecology.

besjournals.onlinelibrary.wiley.com/doi/10.1111/...

Final day of the Sarufutsu fish adventure. We finally say goodbye to salmon carcass and rivers.

What a beautiful Parahucho perryi!!

Beautiful meandering streams with colored leaves! I love it. It was raining, but the sun broke through for a moment.

Day 6 in the Sarufutsu adventure

Reducing Nitrogen Inputs Can Rapidly Reverse Eutrophication in Shallow Phosphorus-Rich Lakes Although phosphorus (P) has been the primary focus of lake eutrophication management efforts globally, we show that reducing nitrogen (N) inputs to shallow P-rich lakes can rapidly reverse accelerated...

Input from new study.

Scott et al. 2025. Reducing Nitrogen Inputs Can Rapidly Reverse Eutrophication in Shallow Phosphorus-Rich Lakes. EST

pubs.acs.org/doi/full/10....

We’re in Sarufutsu, Hokkaido. Enjoyed fish sampling!

Declining adult body size and contracted life history in an unexploited boreal Lake Trout (Salvelinus namaycush) population during a period of warming Evidence of declines in fish body size with warming in the absence of exploitation are lacking. During a period of regional climate warming (1986-2016), we examined trends in growth, size-structure, a...

Input from new study. This is very exciting!

Guzzo et al. 2025. Declining adult body size and contracted life history in an unexploited boreal Lake Trout (Salvelinus namaycush) population during a period of warming. Can. J. Fish. Aquat. Sci.

cdnsciencepub.com/doi/10.1139/...

Input from new study.

Kotsopoulos CJ et al. 2025. Reduced intraspecific variation in lake trout food webs under warmer temperatures and smaller ecosystem sizes. Ecology

esajournals.onlinelibrary.wiley.com/doi/10.1002/...

My first sampling experience this year in mountain lakes was tough but magnificent 🤩 thanks to the team, Javi Sánchez Hernández @ignasiarranz.bsky.social @guillegargomez.bsky.social @biodiversosurjc.bsky.social @iicg-urjc.bsky.social

Our outreach! We set up our booth to present our 50-year history of our Lake Kasumigaua Long-term Monitoring Project.

Input from new study.

Marjohn Yucada Baludo, Dietmar Straile. 2025. Long-term changes in intra- and interspecific trait variability of a small herbivore in a deep perialpine lake. LO
aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

Input from new study.

Berg et al. 2025. Century-scale resilience of stored seagrass blue carbon. LO letters

aslopubs.onlinelibrary.wiley.com/doi/10.1002/...