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Reposted by Ate Jaarsma

NL Institute of Ecology NIOO-KNAW @niooknaw.bsky.social · 25/09/2026

Interested in #ecological #research? Visit our #OpenDay on 3 October. Our theme 'Nature's networks' not only applies to ecological connections, but also to the opportunity of visitors to connect with our researchers. Come #network with us! More info: nioo.knaw.nl/en/events/bi...

nioo.knaw.nl

Big NIOO Open Day 2026: Nature's networks

Save the date: on Saturday 3 October 2026, NIOO will open its doors again to visitors for our Big Open Day. From 11:00 to 17:00, everyone will be welcome. Seize your chance to take a look in our labs ...

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Reposted by Ate Jaarsma

NL Institute of Ecology NIOO-KNAW @niooknaw.bsky.social · 07/08/2026

New publication: Highly stable active core #microbiomes in #Greenland #cryoconite holes during the bare ice period, by @atejaarsma.bsky.social and others. #icesheet #meltseason doi.org/10.1093/fems...

Figure 1 in Feord et al. (2026): "Cryoconite hole sampling location and description on the Greenland Ice Sheet. (A) Sampling was undertaken during the 2022 melt season (DP22) in W-Greenland near Ilulissat (Image credit: Shunan Feng). (B) Site map (Drone image credit: Shunan Feng) with five sampled cryoconite holes: sites 1 and 2 in dark / light blue, sites 3 and 4 in orange and pink, and site 5 in light green (image credit: Shunan Feng). (C) Pictures labeled with day of year (D209 to D230) show temporal cryoconite hole evolution (using site 4 as an example), associated weather conditions (green), and the presence or not of a lid during the sampling period (red). All cryoconite hole pictures through the melt season are available in SFig. 1. The white board in each picture can be used for scale (∼30 cm width)."

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Reposted by Ate Jaarsma

Nathan Ernster @nathanernster.bsky.social · 06/02/2026

Hi Bluesky microbiology/limnology/hydrology/field folks! Has anyone used this style of cordless drill peristaltic pump for sample collection or field filtration? The design checks a lot of our boxes (replaceable tubing, decent suction height, compact batteries), but doesn't seem widely available.

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Ate Jaarsma @atejaarsma.bsky.social · 14/01/2026

So nice to be back in Copenhagen en reconnect with friends at Polar and Alpine Microbiology 2026! I had the pleasure yesterday to present on methane cycling in Arctic lakes as part of the @climet.bsky.social project. #PAM2026

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Reposted by Ate Jaarsma

climet.bsky.social @climet.bsky.social · 24/11/2025

“Tackling the unknowns of Arctic methane.” On Friday the NWO-funded CLIMET consortium met at @niooknaw.bsky.social for its kick-off meeting, bringing together colleagues from NL, the UK, Sweden, Canada and the USA, along with NWO representatives and our external advisor.

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Reposted by Ate Jaarsma

Riikka Rinnan @riikkarinnan.bsky.social · 29/10/2025

Based at @voltcenter.bsky.social you will pioneer research into VOC production & consumption by microorganisms living on ice. You will combine field and incubation experiments, advanced mass spectrometry, and molecular sequencing. employment.ku.dk/phd?show=165... Deadline 15 November 2025.

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Reposted by Ate Jaarsma

climet.bsky.social @climet.bsky.social · 30/09/2025

🚨BSc/MSc project opportunities at NIOO-KNAW! Want to work with unique microbial isolates and lake water samples from Greenland? Projects available: 🔹 Cultivation of methane-oxidising bacteria and associated microbes 🔹 Incubation experiments with glacier dust & DOC See links in comments below!

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Ate Jaarsma @atejaarsma.bsky.social · 17/09/2025

Give our new project account a follow to stay up-to-date with the consortiums progress!

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Ate Jaarsma @atejaarsma.bsky.social · 31/07/2025

5/6 These results shed light on the ecological function of these BGCs for microbial adaptation, competition, and ecosystem functioning, while the novelty of the gene clusters points toward untapped biotechnological potential from this threatened microbial habitat.

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Ate Jaarsma @atejaarsma.bsky.social · 31/07/2025

4/6 🔍 Key findings: • Novel BGCs are expressed on the melting Greenland Ice Sheet • Expression differs between habitats: eukaryotic BGCs dominate glacier ice; prokaryotic BGCs dominate cryoconite • Likely producers include key ecosystem engineers like glacier ice algae and cyanobacteria

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Ate Jaarsma @atejaarsma.bsky.social · 31/07/2025

3/6 Using metatranscriptomics, we show for the first time that many of the encoded BGCs are expressed in situ during the melt season. Many are completely novel, and highly expressed clusters include those for carotenoids, beta-lactones, terpenes, and modified peptides.

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Ate Jaarsma @atejaarsma.bsky.social · 31/07/2025

2/6 These natural products may help microbes cope with UV radiation, nutrient scarcity, and microbial competition, but in situ expression data is often lacking. The question remains; do microbes use their BGCs in their daily life, on the ice surface and in cryoconite holes?

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Ate Jaarsma @atejaarsma.bsky.social · 31/07/2025

1/6 🧊 My last PhD paper is out! We explored what microbes on the Greenland Ice Sheet are actually doing with their biosynthetic gene clusters (BGCs), the genetic blueprints for producing natural products.

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Ate Jaarsma @atejaarsma.bsky.social · 30/06/2025

Back in the Arctic for fieldwork! This time for the CLIMET project, studying methane cycling in Greenland lakes 🦠

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Ate Jaarsma @atejaarsma.bsky.social · 23/05/2025

I'm grateful for the opportunity to continue working on environmental microbiology in the context of climate change, and thrilled to be heading back to the Arctic this summer!

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Ate Jaarsma @atejaarsma.bsky.social · 23/05/2025

Excited to share that I’ll soon start as a postdoc at the Netherlands Institute of Ecology (NIOO-KNAW)! As part of the CLIMET project, I will investigate microbial methane consumption in Greenlandic lakes. @niooknaw.bsky.social

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Ate Jaarsma @atejaarsma.bsky.social · 20/11/2024

I'm looking for a post doc position! I want to contribute to research that helps solve the big problems the world faces, and bring experience in environmental microbiology in extreme environments, natural product research, synthetic and molecular biology. Welcome to share!

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