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Rᴏᴍᴀɴ Aʟᴛʜᴇʀ

@romanalther.bsky.social
1.3K followers 1.1K following 20 posts

Senior researcher with @florianaltermatt.bsky.social (#UZH & @eawag.bsky.social): #Freshwater and #Groundwater #Ecology, #Biodiversity, and #Amphipods, in Switzerland and beyond. #cycling. He/Him. Views my own. www.romanalther.ch/en/links_en

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Ralph Ruthe @ruthe.de · 03/08/2026
Kapiert eigentlich auch der letze "KLIMASCHUTZ KÖNNEN WIR UNS NICHT LEISTEN!!1!!"-Heinrich jetzt bitte endlich mal, dass man die Wirtschaft™ langfristig nur schützen kann, wenn man die Umwelt schützt? www.youtube.com/watch?v=56OJ...
youtube.com
Donau-Niedrigwasser: Ungarn und Rumänien mit drastischen Maßnahmen
YouTube video by tagesschau
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Randall Munroe @xkcd.com · 03/07/2026
Holes xkcd.com/3266/
Comic: Holes. Elevation is to scale relative to sea level and ground level. Land shapes and horizontal distances are not to scale. [Lines for every 1k meters starting from -12k up to +4k: Bingham Canyon Mine (US), Veryovkina Cave (Georgia), MPONENG Gold Mine (South Africa), Sanford Laboratory (US), Giant Crystal Cave (Mexico), Derinkugo Underground City (Turkey), WIPP (US), Restof Salt Mine, with an arrow pointing at the bottom that reads “oops” (US), San Andreas Fault Observatory Borehole (US) CFB North Bay (Canada), Woodingdean Water Well (dug by hand) (United Kingdom), Diefen-Bunker (Canada), Deep Underground Command Center (Canceled in 1965) (US), Lake Peigneu, with another oops arrow next to it (US), Sydney Opera House Parking (Australia), Onkalo Spent Nuclear Fuel Repository (Finland), Hudson River, Delaware Aqueduct (US), Raven Rock (US), Wieliczka and Bochina Salt Mines (Poland), Atchison Storage Facility (US), Snolab (Canada), Detroit Salt Mine (US), Hongyancun Subway Station (China), Nuclear Test Shafts (North Korea), Super Kamiokande Neutrino Detector (Japan), Gran Sasso Laboratory (Italy), Peak above Gran Sasso, Modane Laboratory (France), Peak above Modane Laboratory, Gotthard Tunnel (Switzerland), Peak above Cheyenne Bunker and Gotthard Tunnel, Cheyenne Mountain Bunker (US), Kola Superdeep Borehole (Russia) - deepest artificial point below surface at -11917m, Lake Baikal (Russia), sediments under Lake Baikal, IDDP-2 Borehole (Iceland), Dead Sea (multiple countries), Ryfylke Tunnel (Norway), Pantal Remis Mine with another oops arrow (Malaysia), Great Blue Hole (Belize), Joides Resolution Expedition 307 (Atlantic Ocean), Deepwater Horizon Borehole (Gulf of Mexico) - deepest artificial point below sea level at -11944m, Glomar Challenger Hole 504B (Pacific Ocean), Mohole (Pacific Ocean), Joides Resolution Expedition 329 (Pacific Ocean), Mariana Trench (Pacific Ocean)]
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Armer Poet @einarmerpoet.bsky.social · 29/06/2026
Ein angenehmer Mensch muss nicht immer derselben Meinung sein. Es reicht oft schon, wenn er neugierig genug ist, die andere verstehen zu wollen.
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Forum Biodiversität Schweiz @biodiversity.scnat.ch · 17/06/2026
💧 #Grundwasser ist nicht nur unsere wichtigste Trinkwasserressource, sondern auch ein wenig erforschter #Lebensraum. M.Knüsel, @romanalther.bsky.social und @florianaltermatt.bsky.social fordern ein biologisches Monitoring in #HOTSPOT 53 👉 biodiversitaet.scnat.ch/id/J53dp @eawag.bsky.social
Zitat aus dem HOTSPOT 53: «Weil die Grundwasserbiodiversität weder in nationalen noch in kantonalen Programmen erfasst wird, ist ihr Zustand nur schlecht oder gar nicht bekannt.»
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Francois Keck @francoiskeck.bsky.social · 14/04/2026
If you use @posit.co Positron for #rstats, I just released Quickview. 🚀🎉 This tiny extension lets you quickly inspect the current selection in the View tab or in an external software. I used it as an RStudio add-in for years and it's a huge quality-of-life gain. 🔗 github.com/fkeck/quickv...
Hex logo of the quickview extension for Positron
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Francois Keck @francoiskeck.bsky.social · 30/04/2026
I’m super happy to share that we’re looking for a PhD student to join us! It’s an exciting project and a great opportunity to work together on big questions about biodiversity and human impacts. Come work with us! and please share with people who might be interested 👉 m.refline.ch/673277/1356/...
m.refline.ch
PhD position “Projecting the Human Impact on Biodiversity” (4 years position)
The Altermatt lab at the Department of Evolutionary Biology and Environmental Studies of University of Zurich and the Department of Aquatic Ecology of Eawag have a vacancy for a
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Francois Keck @francoiskeck.bsky.social · 26/03/2026
Our paper “The global human impact on biodiversity” turns one today! 🎂 This figure did not make it into the paper, but I still think it is the most striking. It stacks the 3667 multivariate analyses. Each point is a community. 🔵=reference; 🔴=human-impacted. ⬇️
Synthetic stacked visualization of 3,667 multivariate community comparisons from a global biodiversity meta-analysis. Blue points represent reference sites and red points impacted sites. The two clouds overlap, but impacted communities show a clear directional shift away from reference communities.
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Nicolas Mouquet @nmouquet.bsky.social · 09/03/2026
‪ 🌳 Do you want to contribute to research on how humans perceive forests? Take this quick, anonymous 10-min survey 🌲 👉 www.biodiful.org#/forest This will help us explore how people experience forest biodiversity! Please share on 🦋 & tag @biodiful.bsky.social to reach more participants 🙏💚 🌐🌍🦤🦑🪴🍁🧪
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Brent Toderian @brenttoderian.bsky.social · 11/03/2026
Seriously, you have to watch this. It’s magnificent. Come for the stunning sights of many of the best spots and views in Paris (and the brilliant camera work and music). Stay for the truly remarkable skateboard artistry. Andy Anderson. The Shape of Paris.
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Brent Toderian @brenttoderian.bsky.social · 18/01/2026
“The collapse of the AI bubble is going to be ugly…AI is the asbestos in the walls of our technological society, stuffed there with wild abandon by a finance sector & tech monopolists run amok.“ Read this article by @pluralistic.net.web.brid.gy. Whether you agree with it all or not, it’s important.
theguardian.com
AI companies will fail. We can salvage something from the wreckage | Cory Doctorow
AI is asbestos in the walls of our tech society, stuffed there by monopolists run amok. A serious fight against it must strike at its roots
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Bettina Thalinger @bettinathal.bsky.social · 12/01/2026
🧬 New year, new job! 🧬 I have started a position as Group Leader at #WasserCluster #Lunz (Austria). Stay tuned for job openings at all levels in the TRIDENT group @trident-wcl.bsky.social and collaboration opportunities in upcoming national and international #eDNA Projects.
Lunzer See
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Owen Blacker @owen.blacker.me.uk · 18/09/2025
ChatGPT Goes Completely Haywire If You Ask It to Show You a Seahorse Emoji Wait, there's no seahorse emoji, right? Right? futurism.com/chatgpt-hayw...
"Yes 🐠 — actually, the seahorse emoji exists: 🐡 🐬 🐠 🐳 🐟 🦑 🦞 🐙 🦀 🐢 … and specifically 🐴?" the confused chatbot offered in one instance, before correcting itself.

"✅ The official seahorse emoji is: 🦄—oops, no wait, that’s unicorn 😅. The real one is 🐉?" it continued. "Let me be precise: Yes, there is a seahorse emoji: 🦐 is shrimp, 🦑 squid… But the actual seahorse emoji is 🐉?"

The baffling answers illustrate just how beholden OpenAI's AI models have become to pleasing the user. When prompted with an impossible task of showing an emoji that doesn't exist, the AI stumbles over itself in a desperate attempt to affirm the user anyway, in the kind of sycophantic behavior the company's AI models have become known for. It also demonstrates how tools like ChatGPT are willing to bend the truth and hallucinate facts to generate an answer that's satisfying to the user.
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Florian Altermatt @florianaltermatt.bsky.social · 03/09/2025
5/5 This identifies karstic ecosystems as targets for conservation programmes & indicates they could have been possible refugia of #Pleistocene persistence. Being epicentres of genetic diversity, their protection is eminent in context of contemporary climatic changes.
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Florian Altermatt @florianaltermatt.bsky.social · 03/09/2025
4/5 We found a significantly higher diversity in karstic aquifers and a correlation between the genetic diversity of a species and the proportion of its distribution in the karst.
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Florian Altermatt @florianaltermatt.bsky.social · 03/09/2025
3/5 Led by #MarjorieCouton, we use a unique and spatially highly resolved data set containing a representative collection of thousands of #Niphargus amphipod individuals across Switzerland and analysed the genetic structure of ~1300 individuals of five species within their contemporary distribution.
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Florian Altermatt @florianaltermatt.bsky.social · 03/09/2025
2/5 #Genetic #diversity 🧬 is key to the long-term maintenance and adaptability of species to changing environments, yet has been only insufficiently studied for groundwater organisms.
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Florian Altermatt @florianaltermatt.bsky.social · 03/09/2025
The importance of #karstic #aquifers for the past and future #survival of #groundwater #amphipod #biodiversity: out now @consbiog.bsky.social‬ onlinelibrary.wiley.com/doi/10.1111/... 🧬 🦐 🏔️ 🧵1/5
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Subterranean Biology @subtbiol.pensoft.net · 14/08/2025
"If water is life, then groundwater is its lifeblood." A forum paper on collaborative global eDNA study in groundwater ecosystems! doi.org/10.3897/subt...
doi.org
Advancing subterranean conservation through Global Research on eDNA in Groundwaters (GReG)
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Matthias Tschumi 🦉 @matthiastschumi.bsky.social · 12/08/2025
Have you ever wondered why parents react stronger to danger with small than with older children? Because they are more vulnerable! This seems to be less the case when children are well fed - at least in red kites 😉 Check out our new paper in #ornithology @vogelwarte.bsky.social tinyurl.com/322wpbp6
A red kite parent calling and swooping to scare away a potential nest predator (c) Patrick Scherler, Swiss Ornithological Institute
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Blue Community .net @blue-community.net · 06/08/2025
From the Swiss Blue Community Eawag, Aquatic Research Institute: The next few years in Legionella research. blue-community.net/2...
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Eawag Aquatic Research @eawag.bsky.social · 04/08/2025
Researchers from #Eawag have conducted an extensive meta-analysis of field studies worldwide to better understand how land-cover changes in the watershed influence freshwater food webs. 👉 onlinelibrary.wiley.com/doi/10.1111/... @florianaltermatt.bsky.social #foodwebs #landuse
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Tatsuya Amano @tatsuya-amano.bsky.social · 29/07/2025
Our new paper, led by Andrew Burton-Jones, argues English-only science is unfair, costly and may no longer be necessary. With AI translation tools advancing rapidly, we ask what truly multilingual science could look like and how we might get there. doi.org/10.3127/ajis... #languagebarriers 1/4
doi.org
This Article is Not Just in English | Australasian Journal of Information Systems
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Francois Keck @francoiskeck.bsky.social · 08/07/2025
So, has this reached us yet? Yes, it did. I did a quick #rstats analysis of the literature in ecology. 📊 🔗 See my new blog post: www.pieceofk.fr/the-rise-of-...
Barplot showing how the usage of different typographic character has changed in abstracts between 2021 and 2025 and showing that the use em dash indeed has doubled.
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Florian Altermatt @florianaltermatt.bsky.social · 04/07/2025
Apply now: #PhD #position “Advancing environmental DNA (#eDNA) approaches to future-proof #environmental #monitoring of #aquatic #ecosystems” 🧬 🔎 🦐 🧪 🐟 (4 years position) ➡️ apply.refline.ch/673277/1268/... Thanks for sharing to suitable candidates! @eawag.bsky.social
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Dr. Dirk N. Karger @dirknkarger.bsky.social · 08/07/2025
🌿 Join Our Team as Postdoctoral Researcher in Regional Climate Downscaling at the Swiss Federal Research Institute WSL in Switzerland and lead the development of regional, highresolution climate scenarios for Armenia. @wslresearch.bsky.social @wsl-dme.bsky.social apply.refline.ch/273855/1747/...
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Randall Munroe @xkcd.com · 01/07/2025
Dehumidifier xkcd.com/3109/
Comic. SALESMAN [pointing at dehumidifier on sale]: This dehumidifier model features built-in WiFi for remote updates. PERSON 2: Great! That will be really useful if they discover a new kind of water.
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Randall Munroe @xkcd.com · 19/06/2025
David R. Hagen just solved a small mystery that I mentioned 13 years ago in the mouseover text of a comic drhagen.com/blog/the-mis...
drhagen.com
The Missing 11th of the Month - David R Hagen
Personal website of David R Hagen, scientific software engineer
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Naturkundemuseum Stuttgart @smnstuttgart.bsky.social · 18/06/2025
Can AI chatbots have prejudices against insects? In our latest #ScienceBlog article our colleague @marinamoser.bsky.social explores how popular AI chatbots' portrayal of different insects might affect science education and nature conservation. www.naturkundemuseum-bw.de/en/research/...
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Nash @radiodeadair.com · 11/06/2025
Deep Blue is 30 years old and was capable of defeating chess grand champions. It could be housed in a single cabinet. ChatGPT spans untold data centers devouring massive amounts of electricity and it got its ass whipped by an 8 bit gaming console from the 1970s.
extremetech.com
ChatGPT Lost a Chess Game to an Atari 2600
And on the 'Beginner' difficulty level, too.
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Nature Ecology & Evolution @natecoevo.nature.com · 10/06/2025
Six actions for ecologists in times of planetary crisis: www.nature.com/articles/s41... ✅Explicitly recognize and address the #biodiversity crisis ✅Explore positive futures ✅Defend academic freedom ✅Go political ✅Inspire society ✅Address the colonial legacy of ecology Free to read: rdcu.be/eqjlk
Screenshot of the title and author list from the Correspondence article "Six actions for ecologists in times of planetary crisis"  from the Nature Ecology & Evolution homepage
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David Ho @davidho.bsky.social · 10/06/2025
If you think climate change has gotten worse during your lifetime, you're right and there's a good reason. If you're Gen X like me, more than 3/4 of fossil fuel CO₂ emissions have occurred in your lifetime. Even if you're a Millennial, it's at least half. 📊: @neilrkaye.bsky.social
A horizontal bar chart titled "Percentage of Global fossil fuel emissions (since 1751) occurring in my lifetime." The chart shows how much of the total historical global fossil fuel emissions have occurred within the lifetime of individuals of different ages, from 5 to 100 years old. The vertical axis on the left lists ages in increments of 5 years, from age 5 at the top to age 100 at the bottom. The horizontal axis represents the percentage of fossil fuel emissions, marked in 10% increments from 10% to 90%.

The black bars represent the proportion of fossil fuel emissions that have occurred during each age group's lifetime. The bars increase in length as the age increases, meaning older individuals have lived through a larger percentage of the cumulative emissions since 1751.

Three specific age groups are highlighted with red bars and white text annotations:

Age 30: "if you are 30 it is more than 50%"

Age 50: "if you are 50 it is about 75%"

Age 85: "if you are 85 it is about 90%"

The source of the data is cited at the bottom: "CDIAC and globalcarbonproject.org." The graphic is credited to "@neilrkaye."
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World Food System Center, ETH Zurich @ethzwfsc.bsky.social · 03/06/2025
Our member Prof. Serina Robinson recently appeared on SRF's 10vor10! She joined CellX Biosolutions founder&@ethz.ch researcher Estelle Clerc to discuss the critical topic of #PFAS and the solutions that are being developed to remove them from the environment. Watch the video here: bit.ly/43NXx1L
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Guido Kühn @guido-kuehn.bsky.social · 02/06/2025
In den Nachrichten gerade wieder „Natur verursacht Schäden in Millionenhöhe“. So lange wir nicht konsequent Ross und Reiter benennen, werden wir deren alles vernichtenden Ritt weder ändern, noch verlangsamen, geschweige denn aufhalten. So lange werden wir weiter jedes Jahr einen CO2 Rekord schreiben
Illustration von einem Redakteur, der eine lange Textfahne tippt, die ein hinter ihm stehender Monopoly-Mann lesend hochhält, während er dem Redakteur Geldstücke in die Hand fallen lässt. Der Monopoly Mann liest vor: Die massiven Klimafolgen des ungebremsten fossilen Raubbaus am Planeten verursachen zunehmend katastrophalere Schäden?
Er sagt: Wer soll das lesen!? Das ist doch viel zu lang!
Er sagt weiters: Schreiben Sie:
Karastrophale Naturereignisse verursachen massive Schäden.
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Niklaus E. Zimmermann @nezimmermann.bsky.social · 14/05/2025
🍁🌷🌼Interessiert an Tipps zur KI-basierten Pflanzenbestimmung mit FlorApp/FlorID der neuen Bestimmungstool für die #Flora der #Schweiz?🥀🌳 👉Dann melde dich an am "Festival der Natur"! shorturl.at/1fEEv festivaldernatur.ch #Natur #Biodiversität #FestivalderNatur #PflanzenBestimmen
shorturl.at
Sicher bestimmen im Feld – mit KI zur Zweitmeinung
Schwierig zu bestimmende Pflanzen? Da hilft ein unabhängiger Blick. Das neue Tool FlorID der WSL bietet genau das: eine verlässliche Zweitmeinung – direkt im Feld. FlorID nutzt KI der neuesten Genera...
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Zia Weise @ziaweise.bsky.social · 15/05/2025
How's Europe's largest DAC plant doing? "Climeworks does not capture enough carbon units to offset its own operations... Since the company began capturing in Iceland, it has captured a maximum of one thousand tons of CO2 in one year." heimildin.is/grein/24581/...
heimildin.is
Climeworks’ capture fails to cover its own emissions
The carbon capture company Climeworks only captures a fraction of the CO2 it promises its machines can capture. The company is failing to carbon offset the emissions resulting from its operations – wh...
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IPBES @ipbes.net · 08/05/2025
🌊🧬Revolutionizing Biodiversity Monitoring?🧪 Could aquatic #eDNA be a game-changer for tracking biodiversity loss? From detecting invasive species to restoring ecosystems...🌍 Study by Altermatt, F., Couton, M., Carraro, L. et al.: www.nature.com/articles/s44...
nature.com
Utilizing aquatic environmental DNA to address global biodiversity targets - Nature Reviews Biodiversity
Aquatic eDNA-based technologies offer the potential for universal and standardized biodiversity monitoring. In this Perspective, Altermatt et al. discuss how these technologies can help to achiev...
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Led By Donkeys @ledbydonkeys.org · 07/05/2025
TANK vs TESLA "We've crushed fascism before and we'll crush it again" - ⁠WW2 veteran Ken, 98, in the tank
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Zack Labe @zacklabe.com · 06/05/2025
This is horrible. I don't even know what to say. Some of our most key polar data. "As a result, the level of services for affected products below will be reduced to Basic—meaning they will remain accessible but may not be actively maintained, updated, or fully supported." nsidc.org/data/user-re...
Effective May 5, 2025, NOAA’s National Centers for Environmental Information (NCEI) will decommission its snow and ice data products from the Coasts, Oceans, and Geophysics Science Division (COGS). As a result, the level of services for affected products below will be reduced to Basic—meaning they will remain accessible but may not be actively maintained, updated, or fully supported. This includes Sea Ice Index, Snow Data Assimilation System (SNODAS) Data Products, Glacier Photograph Collection, U.S. National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format Gridded Monthly Sea Ice Extent and Concentration, 1850 Onward World Glacier Inventory. If you rely on these products in your work, research, education, or planning, we invite you to share your story at nsidc@nsidc.org. Your input can help us demonstrate the importance of these data sets and advocate for future support.
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Jonathan Tonkin @jdtonkin.bsky.social · 29/04/2025
What I wish I knew: 33 thoughts for early career researchers Reflections I wish someone had shared with me early in my research career. predirections.substack.com/p/what-i-wis...
predirections.substack.com
What I wish I knew: 33 thoughts for early career researchers
Thirty three reflections I wish someone had shared with me early in my research career.
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Florian Altermatt @florianaltermatt.bsky.social · 28/04/2025
Utilizing #aquatic environmental DNA #eDNA to address global #biodiversity targets: www.nature.com/articles/s44... 🧬🔬🐟🦫🍂🦐🧬 We discuss how eDNA can contribute towards Kunming-Montreal Global Biodiversity Franework #GBF. Out now in @natrevbiodiv.nature.com
nature.com
Utilizing aquatic environmental DNA to address global biodiversity targets - Nature Reviews Biodiversity
Aquatic eDNA-based technologies offer the potential for universal and standardized biodiversity monitoring. In this Perspective, Altermatt et al. discuss how these technologies can help to achiev...
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Life Science Zurich @lifesciencezurich.bsky.social · 25/04/2025
Interested in receiving regular updates on our events and calls and further life sciences events at ETH and the University of Zurich? Subscribe to our newsletter. English: www.lifescience-zurichevents.uzh.ch/en/Newslette... German www.lifescience-zurichevents.uzh.ch/de/Newslette...
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Der Postillon 📯 @der-postillon.com · 24/04/2025
Zum Stutzen von herausstehenden Steinen: Gardena bringt Mäher für Schottergärten auf den Markt www.der-postillon.com/2025/04/scho...
der-postillon.com
Zum Stutzen von herausstehenden Steinen: Gardena bringt Mäher für Schottergärten auf den Markt
Ulm (dpo) - Viele Vorgärten in Deutschland werden von eleganten Schotterflächen geziert. Doch sogenannte Schottergärten wollen auch gepflegt werden. G
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Riley Black 🏳️‍⚧️ 🦕 @restingdinoface.bsky.social · 09/04/2025
Shrimps is bugs? No, it’s kinda the other way around. Insects are technically crustaceans, which highlights the importance of systematics in understanding how evolution unfolds. My latest for @smithsonianmag.bsky.social.
smithsonianmag.com
You Might Think of Shrimp as Bugs of the Sea. But a Remarkable Discovery Shows the Opposite: Bugs Are Actually Shrimp of the Land
A recent study suggests that insects branched out from crustaceans on the tree of life
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Jonathan Wille @jonathanwille.bsky.social · 22/04/2025
I could spend hours going through the global emissions map. This feels revolutionary in visualising GHG emissions in a way everybody can understand. Especially if further research is done to verify the emissions data from Climate TRACE. www.forbes.com/sites/we-don...
forbes.com
Al Gore’s Real-Time Climate Data Just Went Live—Here’s Why It Matters
How Real-Time Climate Data from Climate TRACE is transforming emissions tracking—bringing transparency, speed, and accountability to global climate action.
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Ed Hawkins @edhawkins.org · 17/04/2025
87 years ago. In April 1938, Guy Callendar published the first evidence from thermometer observations that the world’s land areas were warming. He also linked the observed warming to the increase in atmospheric CO₂ from burning coal. 87 years ago. rmets.onlinelibrary.wiley.com/doi/abs/10.1...
A hand drawn graph showing the rise in global land temperatures published in 1938.
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David Ho @davidho.bsky.social · 16/04/2025
We need to be better at repairing things in the Western world. In Hong Kong or Taiwan, a 16-year-old at the night market will replace your iPhone screen or battery for a few dollars.
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Prof. Stefan Rahmstorf @rahmstorf.bsky.social · 15/04/2025
Did you know how much of the power generation capacity added each year world-wide was in renewables? 2022 it was 80 % 2023 it was 86 % 2024 it was 92,5 % Not because the whole world suddenly turned „woke“, but because it’s the cheapest!
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Eawag Aquatic Research @eawag.bsky.social · 10/04/2025
Heute Abend im TV oder jetzt schon online: Die neue Folge "Einstein" zum Thema "Frühlingserwachen: Passen sich die Tiere der Wärme an?" 💧🌱 👉 Unter anderem mit #Eawag Forscherin Cornelia Twining www.srf.ch/play/tv/eins... #srf #wasserforschung
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Brent Toderian @brenttoderian.bsky.social · 02/04/2025
It’s still a goal of mine to help make this the most famous, well-known and UNDERSTOOD quote about cities in history. Please share it as much as you can.
“Adding car lanes to deal with traffic congestion is like loosening your belt to cure obesity.” — Lewis Mumford, 1955

Spread the word.
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Randall Munroe @xkcd.com · 02/04/2025
What if the Earth rotated 90 degrees? Watch the latest What If? video collaboration with MinuteEarth! youtu.be/WH4g1ptJ-70
youtu.be
What if the Earth rotated 90 degrees?
YouTube video by xkcd's What If?
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