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Valentin Ștefan

@veralis.bsky.social
62 followers 85 following 6 posts

🌻🐝 Computer vision for pollinators & nature. Sometimes, for me, some cats make more sense than some people 🐾 💻 github.com/valentinitnelav 📍 @idiv-research.bsky.social 🔗 linkedin.com/in/valentin-stefan/ 🔗 scholar.google.com/citations?user=8HlgXLYAAAAJ&hl=en

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Reposted by Valentin Ștefan
Nature @nature.com · 06/07/2026
Can a PhD be pursued 9-5? go.nature.com/4eU0WS2
go.nature.com
Can you actually do a nine-to-five PhD? Nature readers weigh in
Nature - Nature readers share their PhD time-management woes.
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Reposted by Valentin Ștefan
Adam Grant @adamgrant.bsky.social · 22/06/2026
What really drives leaders to resist remote work isn't productivity. It’s ego. Our new data: Ordering people in full-time is a power and status move. Bosses want to be worshiped at the office altar. Work policies shouldn’t be vanity projects. Hybrid is better for people and performance.
nytimes.com
Opinion | The Secret Reason Bosses Want Everyone Back in the Office, Every Day of the Week
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Reposted by Valentin Ștefan
iDiv Biodiversity Research @idiv-research.bsky.social · 12/05/2026
⏱️Reminder: iDiv Synthesis Centre Working Group Call! Submit your innovative synthesis project idea. 📅 Pre‑proposal deadline: 28 May 2026 🔗 www.idiv.de/research/sdi...
This image shows the iDiv Synthesis Centre Working Group Call description with details about the deadline and general rules.
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Reposted by Valentin Ștefan
IPBES @ipbes.net · 10/02/2026
The IPBES Business and Biodiversity Assessment Report Summary for Policymakers is available now! 🏡 Explore this first of it’s kind report highlighting methods and actions to measure and respond to business impacts and dependencies on nature.🌍 🧪 ipbes.canto.de/b/JTB1U
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Reposted by Valentin Ștefan
iDiv Biodiversity Research @idiv-research.bsky.social · 08/03/2026
Today is #InternationalWomensDay 🌿 We celebrate the women contributing to biodiversity research at iDiv and across our partner institutions. Their work – from field studies to global analyses – helps us better understand and protect life on Earth. #WomenInScience #Biodiversity
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Reposted by Valentin Ștefan
Jamie Alison @jamiealison.bsky.social · 16/02/2026
Sensors and AI can transform understanding of insect biodiversity 🪰📈 BUT we must be wary of the AI hype-train 🚆 and respect existing data and traditional monitoring 🙇 Our new synthetic review lays out seven steps to realise the potential of insect sensing systems 🎥🔭 ecoevorxiv.org/repository/v...
Insect monitoring without pitfalls: Seven steps for robust insect sensing systems
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Reposted by Valentin Ștefan
Justin Kay @justin-kay.bsky.social · 13/10/2025
There are now millions of publicly-available AI models – which one is right for you? We introduce CODA ( #ICCV2025 Highlight! ), a method for *active model selection.* CODA selects the best model for your data with any labeling budget – often as few as 25 labeled examples. 1/ @iccv.bsky.social
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Reposted by Valentin Ștefan
Adam Grant @adamgrant.bsky.social · 12/12/2025
Too many mediocre men talk over capable women. Study of problem-solving teams: Men dominate the conversation, taking 50% more turns and saying 69% more than women. Men with low skill speak more than women with high skill. It's long past time to value competence over confidence.
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Reposted by Valentin Ștefan
Toke Thomas Høye @tokehoye.bsky.social · 02/01/2026
📢Please share📢 We have an opening for an exciting fully-funded PhD project on computer vision and machine learning applied to biodiversity monitoring with amazing Serge Belongie @belongielab.org and @aicentre.dk. Application deadline coming up on 15 January! phd.tech.au.dk/for-applican...
phd.tech.au.dk
Harnessing the power of AI for biodiversity monitoring with camera trap networks - From foundation model to edge processing
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Reposted by Valentin Ștefan
Will Glenny @willglennyphbee.bsky.social · 20/11/2025
Turns out, a lot of the plants we use for bee habit enhancement are already common and mostly support those darn common generalists! Thanks @joseblanuza.bsky.social for the help getting this across the line besjournals.onlinelibrary.wiley.com/doi/10.1111/...
besjournals.onlinelibrary.wiley.com
Flowers for habitat enhancement primarily benefit common insect pollinators across temperate grasslands
Flowers that are attractive and occupy a complementary position in interaction space could be prioritized in flower mixes to recover rare and specialized pollinators. By defining the ecological roles...
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Reposted by Valentin Ștefan
pau enric serra-marin @pauenric.bsky.social · 31/10/2025
‼️🚨My first PhD paper out in @methodsinecoevol.bsky.social We built an automated camera system to detect plant–pollinator interactions (day & night) and compared networks from cameras vs. focal observations. 📜👉 doi.org/10.1111/2041... @annatraveset.bsky.social @imedea.bsky.social
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Valentin Ștefan @veralis.bsky.social · 07/10/2025
Excited to share a new paper led by our colleagues at #DLR! We trained AI to recognize 15 European fly pollinator families and estimate how confident it is, helping ecologists use AI more responsibly. Paper: lnkd.in/dBAWW3hB Code: lnkd.in/du7dD2hc #pollinators #aiforgood #aifornature #UFZ #iDiv
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Valentin Ștefan @veralis.bsky.social · 13/04/2025
Our latest research explores how YOLO object detectors, trained on citizen science images, perform on unseen time-lapse images of pollinators captured with a fixed smartphone setup. While successful for larger pollinators, detecting smaller or blurrier flower visitors remains a challenge.
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Reposted by Valentin Ștefan
Adam Bonica @adambonica.bsky.social · 20/02/2025
The DOGE firings have nothing to do with “efficiency” or “cutting waste.” They’re a direct push to weaken federal agencies perceived as liberal. This was evident from the start, and now the data confirms it: targeted agencies overwhelmingly those seen as more left-leaning. 🧵⬇️
Scatterplot titled “Empirical Evidence of Ideological Targeting in Federal Layoffs: Agencies seen as liberal are significantly more likely to face DOGE layoffs.”
	•	The x-axis represents Perceived Ideological Leaning of federal agencies, ranging from -2 (Most Liberal) to +2 (Most Conservative), based on survey responses from over 1,500 federal executives.
	•	The y-axis shows Agency Size (Number of Staff) on a logarithmic scale from 1,000 to 1,000,000.

Each point represents a federal agency:
	•	Red dots indicate agencies that experienced DOGE layoffs.
	•	Gray dots indicate agencies with no layoffs.

Key Observations:
	•	Liberal-leaning agencies (left side of the plot) are disproportionately represented among red dots, indicating higher layoff rates.
	•	Notable targeted agencies include:
	•	HHS (Health & Human Services)
	•	EPA (Environmental Protection Agency)
	•	NIH (National Institutes of Health)
	•	CFPB (Consumer Financial Protection Bureau)
	•	Dept. of Education
	•	USAID (U.S. Agency for International Development)
	•	The National Nuclear Security Administration (DOE), despite its conservative leaning (+1 on the scale), is an exception among targeted agencies.
	•	A notable outlier: the Department of Veterans Affairs (moderately conservative) also faced layoffs despite its size.

Takeaway:

The figure visually demonstrates that DOGE layoffs disproportionately targeted liberal-leaning agencies, supporting claims of ideological bias. The pattern reveals that layoffs were not driven by agency size or budget alone but were strongly associated with perceived ideology.

Source: Richardson, Clinton, & Lewis (2018). Elite Perceptions of Agency Ideology and Workforce Skill. The Journal of Politics, 80(1).
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Reposted by Valentin Ștefan
iBartomeus @ibartomeus.bsky.social · 04/02/2025
[new paper] EuPPollNet: A European Database of Plant-Pollinator Networks onlinelibrary.wiley.com/doi/10.1111/... Another wonderful paper of @joseblanuza.bsky.social making open more than >1500 networks and looking at their properties. Come for the data, stay for the cool figures!
onlinelibrary.wiley.com
EuPPollNet: A European Database of Plant‐Pollinator Networks
Motivation Pollinators play a crucial role in maintaining Earth's terrestrial biodiversity. However, rapid human-induced environmental changes are compromising the long-term persistence of plant-pol...
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Reposted by Valentin Ștefan
JPE - Journal of Pollination Ecology @jpollecol.bsky.social · 10/01/2025
2025 starts with a methodology publication by Ștefan et al. on Utilising affordable smartphones and open-source time-lapse photography for pollinator image collection and annotation - Happy new year! doi.org/10.26786/192...
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Valentin Ștefan @veralis.bsky.social · 28/01/2025
Our research center (iDiv) will host a very interesting summer school (25 – 29 August 2025) - Deep learning for biodiversity and ecological research. More details here: www.idiv.de/events/summe... #biodiversity #education #aiforgood #technology #idiv
idiv.de
Summerschool 2025: Deep learning for biodiversity and ecological research | iDiv
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