David Kleijn
@davidkleijn.bsky.social
77 followers 95 following 12 posts
Conservation ecologist, Pollinator afficionado, Wageningen University
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Reposted by David Kleijn
jappliedecology.bsky.social
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...
Reposted by David Kleijn
cmhmaliani.bsky.social
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
Reposted by David Kleijn
jmbecologist.bsky.social
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?
davidkleijn.bsky.social
Finished data collection for this paper 19 years ago 🫣
davidkleijn.bsky.social
Important to promote farmland wildlife, but this paper in Science, (doi.org/10.1126/scie...) published 2 days ago, highlights that in intensive agricultural landscapes we first need MORE habitat before we put effort in enhancing quality
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doi.org
davidkleijn.bsky.social
Higher cutting frequency can restore habitat quality on farmland. doi.org/10.1111/1365...
Reposted by David Kleijn
thijsfijen.bsky.social
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
Reposted by David Kleijn
jappliedecology.bsky.social
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...
Reposted by David Kleijn
thijsfijen.bsky.social
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/...
davidkleijn.bsky.social
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.
davidkleijn.bsky.social
Yes, we want to know at what distance plant populations become reproductively isolated. And whether, restoring patches of wildflowers reduces isolation or actually worsens it (pollen competition). Both are possible.
davidkleijn.bsky.social
They seem to be a lot less shy on Terschelling (NL). Took this one yesterday with my phone.
davidkleijn.bsky.social
Bees and beers. The typical use of fridges by pollinator ecologists during field season.
davidkleijn.bsky.social
In another project restpoll.bsky.social we investigate whether flower plantings can improve pollen dispersal between subpopulations. Scientists in action.
davidkleijn.bsky.social
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.
Reposted by David Kleijn
milliehood.bsky.social
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!🌾
no1farmerjake.bsky.social
We’re delighted to host The Green Farm Collective Regen Farming Conf #GFC25 @ Overbury this year the theme is ‘Soil to Slice’ 🌾🐑🐖🍞🥪🍕
Flier for a Regenerative Farming Conference, hosted at Overbury in Worcestershire and organised by The Green Farm Collective. Speakers include David Purdy, Tim Parton, Rude Wade, Millie Hood, Gloria Mazzer, Matthew Adams and Sarah Dusgate. Exploring how we can improve soil and human health through growing better crops and livestock
Reposted by David Kleijn
wadertales.bsky.social
... (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🌍
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…
wadertales.wordpress.com
Reposted by David Kleijn
modacitylife.com
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.
Reposted by David Kleijn
thijsfijen.bsky.social
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.
davidkleijn.bsky.social
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 🤨
davidkleijn.bsky.social
Funny, although....may not be trivial. Every spring a couple of dead bumblebee and wasp queens. And that is just my house.
davidkleijn.bsky.social
LOL. Protect the insects with Unilux screendoors. Almost sorry I don't need them