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Thijs Fijen

@thijsfijen

Assistant professor @ Wageningen UR on #biodiversity #conservation in agricultural landscapes | #pollinators | #insects | #birds

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15.01.2025
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Latest posts by Thijs Fijen @thijsfijen

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MASSIVE BUMBLEBEE MIGRATION! Yesterday, bird migration hotspot Breskens, the Netherlands, counted ~1000 migrating bumblebee queens in a SINGLE HOUR (trektellen.nl/count/view/1...).

More on this extraordinary phenomenon: besjournals.onlinelibrary.wiley.com/doi/10.1111/...
@trektellen.bsky.social

06.03.2026 08:55 πŸ‘ 15 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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πŸ“’ Peatland & PV – could do much better!
Our new study in @springernature.com shows: Solar parks on drained peatlands emit more GHG than they save. 😱 πŸ”— Read the study: www.nature.com/articles/s41...
Why? Drained peatlands release COβ‚‚β€”offsetting clean energy gains.

29.01.2026 07:35 πŸ‘ 42 πŸ” 15 πŸ’¬ 3 πŸ“Œ 4
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What are the reasons why people choose to protect pollinators like bees, butterflies and hoverflies? 🐝 πŸ¦‹

A 2024 #SafeguardResearch examines the factors that influence the behaviour of people in rural and urban areas across 3 European countries.

besjournals.onlinelibrary.wiley.com/doi/10.1002/...

30.01.2026 09:01 πŸ‘ 7 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

You're right! I just had to accept the personalized cookies (which I do not want, but did anyway). I expect also more grazing in Dutch solar parks, but hopefully not low-density year-round. We have good experiences with paid-for grazing management (high-density, short period grazing) here.

14.01.2026 13:57 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Mixed plant and arthropod biodiversity responses to solar parkΒ establishment on former agricultural lands Our results suggest that while biodiversity can increase in solar parks post-conversion compared to previous land use, not all taxonomic groups benefit from the land use change. Potential benefits fo...

Can't read the article (no subscription). Solar parks are actually quite ok for insect biodiversity, when placed on agricultural land: besjournals.onlinelibrary.wiley.com/doi/10.1111/.... More research outcomes will follow! Year-round grazing is not good though. Strip grazing is better.

14.01.2026 13:00 πŸ‘ 1 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Pollinator Academy The Pollinator Academy is a learning platform with integrated taxonomic tools and information on European pollinators.

This gallery of almost all EU bee species high quality photos is quite impressive: pollinatoracademy.eu/images

22.12.2025 09:30 πŸ‘ 34 πŸ” 21 πŸ’¬ 0 πŸ“Œ 1
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Bee pollination increases fruit weight and antioxidants in pumpkins - Arthropod-Plant Interactions Due to the global decline of pollinators, global food security is at risk. Crops essentially dependent on pollinators such as pumpkin (Cucurbita moschata Duchesne, Cucurbitaceae) are the most affected. Although the importance of pollinators for crop productivity is known, there are many gaps in knowledge regarding the influence of pollination on crop quality, especially on the chemical composition of fruits and seeds. Here, we evaluated the relationship between floral display, frequency of visits and crop production, using three pumpkin plantations in the semi-arid region of NE Brazil as a model. In all sites we recorded floral display, floral visitors, and compared fruit set, fruit quality and seed number between natural (NP) and cross (CP) pollination experiments. Bees were the main pollinators, and Apis mellifera and Trigona spinipes were the most frequent. Floral display was positively correlated with the total number of visits, which had a positive relation with fruit weight, specifically because of T. spinipes visits. Visitation by A. mellifera had a negative relationship with pericarp length. Fruit set was about 9% higher in NP than in CP, whose fruits had lower antioxidant activity than the former. Floral display was positively related to the frequency of visits of pumpkin produced in the semi-arid region of northeastern Brazil. Bees were the main pollinators, especially T. spinipes and A. mellifera, which positively influenced fruit weight. Thus, pollinators favored fruit set, weight, and quality, in addition to promoting antioxidant potential.

Bee pollination increases fruit weight and antioxidants in pumpkins

Pollination influences crop quality, especially the nutrient composition of fruits and seeds (micronutrients in our diet)

#onehealth
#health
#micronutrients
#pollinators
#microhunger

link.springer.com/article/10.1...

16.12.2025 08:11 πŸ‘ 11 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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Mixed plant and arthropod biodiversity responses to solar park establishment on former agricultural lands πŸ¦‹

Suggests that, while biodiversity can increase in solar parks post-conversion compared to previous land use, not all taxonomic groups benefit from this change 🌏πŸ§ͺ

doi.org/10.1111/1365...

08.10.2025 11:02 πŸ‘ 18 πŸ” 8 πŸ’¬ 0 πŸ“Œ 0
A sweat bee resting on a flower.

A sweat bee resting on a flower.

A new study in Science evaluating published data from 19 countries has pinpointed the minimum habitat levels needed to sustain pollinators in agricultural landscapes. https://scim.ag/3VIq4Cg

05.10.2025 20:01 πŸ‘ 77 πŸ” 21 πŸ’¬ 1 πŸ“Œ 1
Four graphs comparing species richness at various taxonomic levels

Four graphs comparing species richness at various taxonomic levels

A welcome research comparing the results of pollinator monitoring obtained by humans (so-called 'pollination ecologists') and concurrent time-lapse videos (so-called 'the future for lazy' 😜). Take a quick glance at this figure from the paper and judge for yourself

doi.org/10.1002/aps3...

01.10.2025 12:03 πŸ‘ 39 πŸ” 9 πŸ’¬ 3 πŸ“Œ 0

This was a global synthesis with many co-authors and data-providers - many thanks to all of them!
But when I say global.. effectively it is Europe and North America. Again. We included tropical studies, but only searched in English literature. Happy if someone improves by including other languages!

25.09.2025 18:03 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Habitat quality matters, but not as much as creating more habitat. Doubling habitat cover doubles population size. Doubling habitat quality does not, and seems to be unreasonable to achieve. However, habitat quality and diversity are super important for pollinator diversity!

25.09.2025 18:03 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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We need much more semi-natural habitat (6-37%, depending on species group) in agricultural landscapes to effectively conserve pollinators. Large collaborative synthesis study looking at 59 studies in 1250 landscapes from 19 countries now published in Science www.science.org/doi/10.1126/...

25.09.2025 18:03 πŸ‘ 66 πŸ” 33 πŸ’¬ 1 πŸ“Œ 1
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Why do queen bumblebees emerge from hibernation during weekends? - Apidologie Climate-driven shifts in bumblebee emergence and flowering time can disrupt plant reproduction and affect pollinator health. To study such mismatches, accurate phenological data is crucial but challen...

"Why do queen bumblebees emerge from hibernation during weekends?"

I love this framing about bias in hobbyist-collected data.

22.09.2025 16:57 πŸ‘ 140 πŸ” 37 πŸ’¬ 3 πŸ“Œ 5
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NL Greenlabel β€Ί Nieuw EcoCertified Solar Parks-label: zonneparken die energie Γ©n natuur opleveren Consortium lanceert β€˜EcoCertified Solar Parks’: een label voor natuurinclusieve zonneparken met meerwaarde voor energie, bodem, biodiversiteit en landschap.

This research was part of the #EcoCertifiedSolarParks project, which has created an independent label that should allow for the development of nature-inclusive solar parks. nlgreenlabel.nl/blog/nieuws/... (click right above for Dutch/English/German).

23.09.2025 08:37 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Dutch solar parks approach pollinator & plant biodiversity levels of extensive grasslands, but only on the surface not covered by panels. Soil-emergent arthropods and butterflies lack behind. Proud of Timea for leading besjournals.onlinelibrary.wiley.com/doi/10.1111/...
@jappliedecology.bsky.social

23.09.2025 08:37 πŸ‘ 24 πŸ” 10 πŸ’¬ 1 πŸ“Œ 0
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In maart hebben we ook een paal geinstalleerd op perceel Ede. Vandaag was de kast bezet!

13.04.2025 12:04 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
A young planted hedgerow with installed next boxes on wooden poles, and in the background a long pole with a kestrel next box installed. The nest box has two common kestrels sitting in it.

A young planted hedgerow with installed next boxes on wooden poles, and in the background a long pole with a kestrel next box installed. The nest box has two common kestrels sitting in it.

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Doing science biodiversity is great, but the impact is usually not very tangible. Together with citizen cooperative Land van Ons (@landvanons.bsky.social) we planted 300 meter of native hedgerow last December, and installed nest boxes. Today, I jumped of joy because the kestrel box is occupied!

13.04.2025 12:02 πŸ‘ 11 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0

With first sites being now resurveyed, we have just added another 50+ sites especially in Southern Germany: www.dda-web.de/monitoring/h... (+ more to follow!)

06.03.2025 09:07 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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New project! Ever wondered about shifting #baselines in #conservation? Thought about quantifying historical biodiversity losses? We launched a nationwide #resurvey of historical bird surveys in Germany. Together with www.dda-web.de, we have...

31.01.2025 10:47 πŸ‘ 31 πŸ” 10 πŸ’¬ 1 πŸ“Œ 4
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Our March issue is out now!

Topics include:
πŸ‘‰The effect of mass-flowering lupin on wild bee conservation🐝
πŸ‘‰Managing marine invasive species in a changing world🌊
πŸ‘‰Assessing foodborne pathogen survival in bird faeces to co-manage farms🐦

Read more:
besjournals.onlinelibrary.wiley.com/toc/13652664...

05.03.2025 13:37 πŸ‘ 11 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Screenshot of the paper front page.

Screenshot of the paper front page.

Now this is exciting.

Antonin and his team have just published a study showing that the number of migrating hoverflies through Czechia are positively correlated with the numbers of birds!
Suggests that the birds are using the flies as fuel on migration.

royalsocietypublishing.org/doi/epdf/10....

05.03.2025 14:25 πŸ‘ 128 πŸ” 47 πŸ’¬ 2 πŸ“Œ 8
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Our new paper, based on data from 1,705 studies, shows that pesticides are toxic to organisms they are not intended to harm, including fungi, microbes, plants, insects, & vertebrates such as ourselves. Questions the wisdom of applying over 3 million tonnes of them every year...

13.02.2025 16:14 πŸ‘ 490 πŸ” 256 πŸ’¬ 7 πŸ“Œ 28
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Crop diversification for pollinator conservation - Landscape Ecology Context Intensive agriculture drives insect decline impacting insect-mediated ecosystem services that support production. Crop diversification shows promise in increasing crop productivity and enhanci...

Very interesting review article "Crop diversification for pollinator conservation" by Thijs Fijen, @eeraertsmaxime.bsky.social, @juliaosterman.bsky.social, @catrinwestphal.bsky.social and co-authors in Landscape Ecology!

13.01.2025 17:24 πŸ‘ 16 πŸ” 9 πŸ’¬ 0 πŸ“Œ 0
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New research suggests that adding lupin to crop rotations can promote bumblebees in agricultural landscapes, but diverse bee populations need more than just flowering crops 🐝🌏 πŸ§ͺ

πŸ”— https://buff.ly/40wpUjc

12.02.2025 13:03 πŸ‘ 37 πŸ” 7 πŸ’¬ 3 πŸ“Œ 1

Thanks for sharing John! Curious to hear your thoughts

31.01.2025 09:57 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

This was part of Gabriella Bishop's PhD, funded through the EU Horizon project SHOWCASE. She did an awesome job (and look at her drawings!). Thanks also to the lupin farmers, and LekkerLupine!

31.01.2025 09:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Mass‐flowering lupin has positive, but limited, effect on wild bee conservation in agricultural landscapes Our results indicate that lupin can potentially support the few common, abundant bee species that preferentially visit it. However, to effectively support the entire bee community, conservation manag...

Very excited about these results! We experimentally added 1ha flowering lupin fields into the crop cultivation, and tested whether that increases pollinator populations. Yes! It helps, but obviously more conservation measures are needed too!

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

31.01.2025 09:48 πŸ‘ 5 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Crop diversification for pollinator conservation - Landscape Ecology Context Intensive agriculture drives insect decline impacting insect-mediated ecosystem services that support production. Crop diversification shows promise in increasing crop productivity and enhanci...

New study: #CropDiversification can help pollinators without taking land out of agricultural production, but only some #pollinator species may benefit. We highlight mechanisms on the spatial
and temporal #diversity of crops. Led by Thijs Fijen @w-u-r.bsky.social

14.01.2025 11:57 πŸ‘ 39 πŸ” 16 πŸ’¬ 2 πŸ“Œ 0