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David Kleijn

@davidkleijn.bsky.social
155 followers 108 following 25 posts

Conservation ecologist, Pollinator afficionado, Wageningen University

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David Kleijn @davidkleijn.bsky.social · 25/08/2026
Effectiveness of biodiversity interventions increases with farmer attitude towards biodiversity for bees, but not for plants and spiders. Really nice paper by Jeroen Scheper and colleagues 😄. Significant output of EU H2020 Showcase project. doi.org/10.1016/j.bi...
doi.org
Redirecting
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David Kleijn @davidkleijn.bsky.social · 25/07/2026
Again an extremely dry year. We see in our monitoring it reduces bee numbers. We speculate this has something to do with floral resources. Just stumbled over this important paper that corroborates this: besjournals.onlinelibrary.wiley.com/doi/10.1111/...
besjournals.onlinelibrary.wiley.com
Dryness, wetness and temporary flooding reduce floral resources of plant communities with adverse consequences for pollinator attraction
Changing precipitation patterns will adversely affect floral resources and pollinator attraction in agriculturally used temperate grassland, which might have widespread negative consequences for poll....
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David Kleijn @davidkleijn.bsky.social · 09/04/2026
Supercool paper on the consequences of pollinator decline for vegetation diversity. One of these 'would love to do that but don't know how' experiments esajournals.onlinelibrary.wiley.com/share/8KWWBH...
esajournals.onlinelibrary.wiley.com
Pollinators maintain biodiversity in assembling plant communities
Reader environment loaded
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David Kleijn @davidkleijn.bsky.social · 18/03/2026
Cool new paper by Iryna Litovska. One more confirmation that what is good for pollinators isn't automatically good for crop pollination (and vice versa). rdcu.be/e8Kwf
rdcu.be
Wildlife-friendly interventions promote wild bees, but crop species respond differently to the number of visits by pollinators
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David Kleijn @davidkleijn.bsky.social · 29/12/2025
First ever evidence that multi-actor collaborative conservation produces biodiversity benefits (as far as I know) doi.org/10.1016/j.bi...
doi.org
Redirecting
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Journal of Applied Ecology @jappliedecology.bsky.social · 04/11/2025
Semi-natural habitats are key for farmland biodiversity but their quality is often low due to high exposure to fertilizers 🌾🧪 A new study shows that more frequent cutting can create diverse vegetation even in highly productive habitats ✂️🌏 🔗 doi.org/10.1111/1365...
doi.org
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Basic and Applied Ecology @basicapplecol.bsky.social · 02/11/2025
🌿🪶 New Review in #BAAE: Abandonment & intensification impact biodiversity in marginal grasslands. Across 174 European studies, both pathways reduced diversity — while restoration & extensive management help recover ecological value. 🌾 DOI: doi.org/10.1016/j.ba... @gfoesoc.bsky.social
Geographical distribution of observations from studies included in the final analysis. Circle size is scaled for visualization purposes to improve visibility of overlapping data points, and does not encode any quantitive information. The center of each circle corresponds to the coordinates of the reseach area of the included studies.Probabilities of observing an increase or no change in biodiversity upon conservation of extensively managed grasslands, and of observing an increase in biodiversity after restoration of previously abandoned or intensively used agriculturally marginal grasslands. Numbers indicate sample sizes. Raw data are overlaid as jittered points to show the distribution of observed outcomes that informed the model.
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NatureTodayNL @naturetodaynl.bsky.social · 25/10/2025
dlvr.it
The winners take it all: het effect van intensief landgebruik op insecten
Nieuw onderzoek laat zien wat het steeds intensievere gebruik van grasland betekent voor insecten. Verrassend genoeg bleef bij intensiever gebruik het totale aantal insecten stabiel, maar de soortenrijkdom halveerde. Dit komt doordat soorten verschillend reageren. 85 procent van de soorten ging achteruit en de meeste verdwenen volledig, maar een paar wijdverspreide soorten profiteerden.
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David Kleijn @davidkleijn.bsky.social · 12/10/2025
Fall ❤️
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David Kleijn @davidkleijn.bsky.social · 10/10/2025
Intensifying grassland management leads to massive loss of arthropod species. However, total arthropod numbers remain more or less stable. Many losers, few winners. doi.org/10.1016/j.bi...
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Journal of Applied Ecology @jappliedecology.bsky.social · 08/10/2025
Mixed plant and arthropod biodiversity responses to solar park establishment on former agricultural lands 🦋 Suggests that, while biodiversity can increase in solar parks post-conversion compared to previous land use, not all taxonomic groups benefit from this change 🌏🧪 doi.org/10.1111/1365...
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Carlos M Herrera @cmhmaliani.bsky.social · 01/10/2025
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...
Four graphs comparing species richness at various taxonomic levels
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James Bullock @jmbecologist.bsky.social · 27/09/2025
Politics is complicated Business is complicated Finance is complicated So why do they all expect ecologists to come up with simple actions & metrics for nature recovery Could they be spinning us a line?
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David Kleijn @davidkleijn.bsky.social · 27/09/2025
Higher cutting frequency can restore habitat quality on farmland. doi.org/10.1111/1365...
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Thijs Fijen @thijsfijen.bsky.social · 23/09/2025
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
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Journal of Applied Ecology @jappliedecology.bsky.social · 25/09/2025
Using total abundance as a proxy for wild bee species richness: A practical tool for non-experts 🐝🌏 Proposes that employing an effective proxy for non-experts could enhance the evaluation of many local and regional conservation initiatives 📑🧪 🔗 doi.org/10.1111/1365...
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Trouw @trouw.nl · 25/09/2025
Veel meer natuur nodig om nuttige insecten voor de landbouw te behouden
trouw.nl
Veel meer natuur nodig om nuttige insecten voor de landbouw te behouden
Regels van de EU die tot herstel van de insectenpopulatie moeten leiden zijn ontoereikend, blijkt uit Wagenings onderzoek dat donderdag gepubliceerd is in het wetenschappelijke tijdschrift Science.
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NatureTodayNL @naturetodaynl.bsky.social · 25/09/2025
dlvr.it
Met 10 procent leefgebied herstellen bestuivers niet
Bijen, hommels en vlinders hebben te weinig natuur om zich heen om te overleven. Uit recent, in Science gepubliceerd, onderzoek onder leiding van een onderzoeksteam van Wageningen University & Research blijkt dat deze insecten veel meer ruimte nodig hebben om te herstellen dan nu in EU-richtlijnen is vastgelegd. Ook blijkt de kwaliteit van die ruimte belangrijk om mee te nemen.
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Thijs Fijen @thijsfijen.bsky.social · 25/09/2025
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/...
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David Kleijn @davidkleijn.bsky.social · 21/06/2025
Just because it is so beautiful. Megachile laechella. Rare in the Netherlands, but locally abundant in the dunes of Terschelling. The Dutch name 'zilveren fluitje' means silver whistle, after the high tone it makes while flying and the colour of.., well just look at it.
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David Kleijn @davidkleijn.bsky.social · 23/05/2025
Bees and beers. The typical use of fridges by pollinator ecologists during field season.
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David Kleijn @davidkleijn.bsky.social · 23/05/2025
In another project restpoll.bsky.social we investigate whether flower plantings can improve pollen dispersal between subpopulations. Scientists in action.
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David Kleijn @davidkleijn.bsky.social · 23/05/2025
What are the consequences of pollinator decline for wild plants? Here we try to find out in @valor-project.eu. Interesting observations. I never see Centaurea jacea flowers with pollen. But keep the pollinators away and the flowers are dusted white. Very popular species.
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Amelia Hood @milliehood.bsky.social · 09/05/2025
Excited to be presenting results from the SHOWCASE project and Agroforestry Group this month! Our farm trials across England have shown cover crops can increase earthworms by 65% in the following cash crops! AND agroforestry promotes worms too, especially in drought years 😎 Hope to see you there!🌾
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Graham Appleton @wadertales.bsky.social · 21/04/2025
... (reserve-equivalent) enhancement initiatives, supported by one-to-one advice, within or close to existing reserves." Here's an example of this working for waders in eastern England, spear-headed by the much-missed Mark Smart: wadertales.wordpress.com/2019/06/14/m... #ConservationScience🌍
wadertales.wordpress.com
Managing water for waders
Your task, should you choose to accept it, is to turn farmland into a haven for breeding waders. The only tools you have at your disposal are tractors and cows and we will give you permission to pu…
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Melissa & Chris Bruntlett @modacitylife.com · 20/04/2025
The geveltuin (“facade garden”) policy is found in most Dutch municipalities, as here in Delft. Provided they meet a set of requirements, including preserving footpath width, residents are encouraged to remove paving stones in front of their property and replace them with greenery. No permit needed.
A brick residential street in Delft lined with trees, benches, bike parking, and low-rise brick and wooden buildings. The first storey of many of these buildings is covered with climbing plants and flowers.A brick residential street in Delft lined with trees, benches, bike parking, and low-rise brick and wooden buildings. The first storey of many of these buildings is covered with climbing plants and flowers.A brick residential street in Delft lined with trees, benches, bike parking, and low-rise brick and wooden buildings. The first storey of many of these buildings is covered with climbing plants and flowers.A brick residential street in Delft lined with trees, benches, bike parking, and low-rise brick and wooden buildings. The first storey of many of these buildings is covered with climbing plants and flowers.
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Thijs Fijen @thijsfijen.bsky.social · 13/04/2025
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!
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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David Kleijn @davidkleijn.bsky.social · 07/04/2025
Our field site for the pollination study in the Horizon Europe VALOR project. A bit jealous of the PhD student who gets to spend a couple of months there 🤨
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David Kleijn @davidkleijn.bsky.social · 29/03/2025
LOL. Protect the insects with Unilux screendoors. Almost sorry I don't need them
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