Ichiro Matsuzaki

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/...

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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.

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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/...

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

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

Our fish monitoring data has deposited to #GBIF. Our data is CC-BY. Please look at and use our data!
www.gbif.org/dataset/721e...

Original data is published from our Lake Kasumigaura Database. db.cger.nies.go.jp/gem/moni-e/i...

I'm going to visit Boulder, Colorado, again to join the freshwater zooplankton workshop. Honestly, I'm nervous as always, because English is a big wall to me. I'm not good at listening/speaking. But, I'm really excited to talk about science and receive many feedback and advice, which make me growth.

This is the iconic ‘Tower of the Sun,’ designed by artist Taro Okamoto for Expo 1970 in Japan. It still stands today, and you can even go inside. Did you know that? Inside, you’ll find the ‘Tree of Life.’

taiyounotou-expo70.jp/en/about/

My family visited the Hiroshima Peace Memorial Museum. Hiroshima is the site of the first atomic bombing in human history. I found this stone monument there.

War is the work of man.
War is destruction of human life.
War is death.

These are the words of Pope John Paul II, spoken in 1981.

Beyond lethal temperatures: Factors behind the disappearance of chum salmon from their southern margins under climate change The Tone River in Japan represents one of the southern limit distributions of chum salmon (Oncorhynchus keta) on the western side of the North Pacific, but the number of adult chum salmon observed her...

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Yu-Lin K. Chang, Kentaro Honda, Kentaro Morita (2025) Beyond lethal temperatures: Factors behind the disappearance of chum salmon from their southern margins under climate change. PlosOne

journals.plos.org/plosone/arti...

Impacts of an anxiolytic drug on fish behaviour and habitat use in a natural landscape #ProcB #OpenAccess #Behaviour #EnvironmentalScience royalsocietypublishing.org/doi/10.1098/...

Clarifying the trophic state concept to advance macroscale freshwater science and management For over a century, ecologists have used the concept of trophic state (TS) to characterize an aquatic ecosystem's biological productivity. However, multiple TS classification schemes, each relying on...

New paper alert!! Our viewpoint piece uses data from the U.S. EPA National Lakes Assessment + Landsat to see how differing definitions of trophic state can skew and enhance our understanding of lake ecosystems! @ecologicalsociety.bsky.social esajournals.onlinelibrary.wiley.com/doi/10.1002/...

Clarifying the trophic state concept to advance macroscale freshwater science and management For over a century, ecologists have used the concept of trophic state (TS) to characterize an aquatic ecosystem's biological productivity. However, multiple TS classification schemes, each relying on....

It takes patience to have a conversation about definitions as a collaboration begins... but it is important!
"Trophic state" in lakes is one of those concepts! It really makes a difference which definition we use... @mishafredmeyer.bsky.social
esajournals.onlinelibrary.wiley.com/doi/10.1002/...

Input from new study.

This is a great and useful review!

Smith et al. 2025. Impacts of Climate Change Interventions on Biodiversity, Water, the Food System and Human Health and Well-Being. Global Change Biology.
onlinelibrary.wiley.com/doi/10.1111/...

Locations of the 31 mountain lakes across five regions of the European Alps that we sampled this summer.

Thanks everyone for your time commitment and hard work - a truly collective effort! With @maxemilschon.bsky.social, @lqueiss.bsky.social, @drjmpetersen.bsky.social, @sumayrasultanji.bsky.social‬, @hoeferlab.bsky.social, and the rest of the team.

Now the lab work begins! Here are some of our microbial enrichment cultures from the mountain lakes.

The precious collection of filter concentrates for DNA sequencing, light/electron microscopy analysis, and virus isolation.

The 2025 #CAPSOLUTION expedition is finished!
To sample microbes from 31 mountain lakes across the Alps, we drove 5400 km, hiked 130 km and climbed 10,000 m with our gear, braved snow- and thunderstorms, and filtered 4000 L of water. Well done everyone!!
@mpimarinemicrobio.bsky.social
@erc.europa.eu

Diagram of a template design for a CTmax apparatus. Aeration, mixing mechanisms (pump), and heating elements are in an ‘equipment section’ that is physically separated with a screen from the part of the arena containing the animals (‘animal arena’; here with fish). A submerged temperature sensor (or data logger) is used to log temperatures, in addition to a temperature sensor with a display that is used to score CTmax in real time. The time and temperature should only be visible to the data recorder (and/or video camera), not to the person observing animals for end points.

📖Published📖

Raby et al. provide a comprehensive, practical guide for designing and conducting experiments to measure critical thermal limits, with an emphasis on CTmax 🌍 🧪 👇

buff.ly/iZN6Xdg

Input from new study.

Paíz et al. 2024. Near-term lake water temperature forecasts can be used to anticipate the ecological dynamics of freshwater species. Ecosphere

esajournals.onlinelibrary.wiley.com/doi/full/10....

Warming riverscapes annually challenge the role of thermal refuges for thermoregulating salmonids While our model assumes static thermal refuge conditions due to data limitations, our findings highlight the limits of riverscape thermal refuges as a conservation tool under intensifying climatic co....

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Sullivan et al. 2025. Warming riverscapes annually challenge the role of thermal refuges for thermoregulating salmonids. J Applied Ecology

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

Dispersal Ability Reduces Thermal Specialization and Prevents Climate‐Driven Extinctions in a Neotropical Rainforest

buff.ly/nNuQFG7

Assessing biodiversity trends in a quasi-permanent non-equilibrium state The ‘equilibrium assumption’ underlying biodiversity trends assessments in response to environmental changes is rarely challenged, the traditional assumption being that biodiversity is in an equilibrium state with its contemporary drivers. Existing non-equilibrium biodiversity frameworks still rely on the assumption that biodiversity is, at a given moment in time, in an equilibrium state with its contemporary drivers. In this opinion article we consider multiple trajectories of changes due to long-term disturbances that push biodiversity into a quasi-permanent non-equilibrium state. We propose a conceptual framework based on the use of temporal influence functions that can be integrated into a wide range of ecological models. The complete paradigm shift we provide can hindcast past, and project future, non-equilibrium biodiversity trends.

Online now: Assessing biodiversity trends in a quasi-permanent non-equilibrium state

State of the Climate in 2024 just published as a supplement to the Bulletin of the American Meteorological Society. Researchers around the world are contributing to this report. We also provide our monitoring data of Lake Kasumigaura, Japan, every year.
www.ametsoc.org/ams/publicat...

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Ruiz and Kainz (2025) Extreme temperature events directly and indirectly mediate evolutionary adaptation of zooplankton metabolic rate. L&O

aslopubs.onlinelibrary.wiley.com/doi/full/10....

Changing fish invasion patterns associated with community fish species turnover in 15 Chinese plateau lakes Read the free Plain Language Summary for this article on the Journal blog.

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Songhao Ji et al. 2025. Changing fish invasion patterns associated with community fish species turnover in 15 Chinese plateau lakes. Functional Ecology

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

Temporal dynamics of courtship and spawning in medaka under laboratory conditions revealed by 24 h video monitoring - Scientific Reports Scientific Reports - Temporal dynamics of courtship and spawning in medaka under laboratory conditions revealed by 24 h video monitoring

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Kondo at al. 2025.Temporal dynamics of courtship and spawning in medaka under laboratory conditions revealed by 24 h video monitoring. Sci Rep

www.nature.com/articles/s41...

gmmDenoise: A New Method and R Package for High‐Confidence Sequence Variant Filtering in Environmental DNA Amplicon Analysis Assessing and monitoring genetic diversity is vital for understanding the ecology and evolution of natural populations but is often challenging in animal and plant species due to technically and phys....

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Great eDNA statistical tool!!

gmmDenoise: A New Method and R Package for High-Confidence Sequence Variant Filtering in Environmental DNA Amplicon Analysis
onlinelibrary.wiley.com/doi/10.1111/...

Freshwater habitats are increasingly threatened by anthropogenic activities. This #Perspective article outlines physiological approaches for assessing and mitigating threats to freshwater fishes. 🐟

Read it here ➡️ doi.org/10.1093/conp...

Our paper is just out from Restoration Ecology.

Matsuzaki SS et al. 2025. Spatial variation of multifunctionality among abandoned rice paddies and irrigation ponds: potential roles of hydrological and environmental factors.

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