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Kari Koivula

@koivulakari.bsky.social
208 followers 385 following 24 posts

Ecologist, ornithologist, naturalist. Boreal forests, Baltic Sea & shorebirds. PhD, University Lecturer @unioulu.bsky.social Finland. Football @chelsea-fc.bsky.social

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Reposted by Kari Koivula
Evolution Letters @evolletters.bsky.social · 28/09/2026
Why do sex ratios become biased before adulthood? In ruffs, slower male development delays fledging and increases exposure to predators, shifting the sex ratio even before sexual maturity. academic.oup.com/evlett/advan... @chorlnev.bsky.social Image credit: T. R. Shankar Raman
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Clemens Küpper @chorlnev.bsky.social · 29/09/2026
‼️Now published @evolletters.bsky.social Developmental differences between males and females alter the sex ratio. 🐥🧵 about this study 1/9
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Graham Appleton @wadertales.bsky.social · 20/06/2026
How does climate change affect waders? For Dunlin breeding around the Baltic, climate change brings higher water levels, more storms and flooded nests. Blog from 20 June 2021 🎂5️⃣ wadertales.wordpress.com/2021/06/20/d... Papers by @vmpakanen.bsky.social @koivulakari.bsky.social et al. #ornithology
wadertales.wordpress.com
Dunlin: tales from the Baltic
Veli-Matti Pakanen, Kari Koivula  and colleagues have been studying Finnish Dunlin for nearly twenty years. These are schinzii birds that breed in coastal grazing meadows around the Baltic Sea…
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Kari Koivula @koivulakari.bsky.social · 01/04/2026
Surprise visitor from Siberia in our garden! Oriental turtle dove.
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Clemens Küpper @chorlnev.bsky.social · 01/04/2026
Nest failure in threatened #shorebirds has many reasons. Replacing eggs of vulnerable clutches with dummy eggs boosts nest survival of #Ruffs in grazed coastal meadows. New paper out 🎉 dx.doi.org/10.1002/ece3... in @ecol-evol.bsky.social #conservation #ornithology
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Clemens Küpper @chorlnev.bsky.social · 01/04/2026
This work was led by freshly celebrated PhD Hanna Algora with vital contributions from @koivulakari.bsky.social @vmpakanen.bsky.social @jellybb.bsky.social, Kriszti Kupán and others
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Kari Koivula @koivulakari.bsky.social · 29/03/2026
Start of breeding season 2026. Boreal owl incubating at 65° N.
Boreal owl peeking from nest box entrance.
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Kate Laskowski @katelaskowski.bsky.social · 17/02/2026
Stoked about the new Replication Studies section in Behavioral Ecology? Me too! Jeremy Fox over at Dynamic Ecology interviewed me about our recent commentary on this topic and I'd love to hear the community's thoughts! dynamicecology.wordpress.com/2026/02/17/t...
dynamicecology.wordpress.com
The value of close replications and how to get more of them: interview with Kate Laskowski
Welcome to our latest interview with the author of a recent interesting paper. Today’s interview was conducted by email with behavioral ecologist Kate Laskowski, first author ofLaskowski et a…
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Miguel A Gómez Serrano @gomezserrano-ma.bsky.social · 28/09/2025
Interesting talk by @jellybb.bsky.social about the aberrant egg coloration in Ruff clutches. Blue eggs may affect nest survival, but fitness effects may be habitat dependent. @waderstudy.bsky.social IWSG Conference 2025 in Groningen (Netherlands) #IWSG2025 #waders #shorebirds
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Simon Vandepitte @simonvandepitte.bsky.social · 06/07/2025
5/5 In addition, a huge effort is made to protect the #critically #endangered southern #dunlin. With expertise of Vroni Rohr-Bender and others, 26 chicks got an advantage be growing up in our aviary, before they got released back in the meadows, hopefully successfully #boosting the #population.
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Simon Vandepitte @simonvandepitte.bsky.social · 06/07/2025
1/5 - What.an.increadible.fieldseason! Together with @koivulakari.bsky.social , @jelenasubotic.bsky.social , @chorlnev.bsky.social , @vmpakanen.bsky.social, Kristzi Kupan, Vroni Rohr-Bender and others we managed to find plenty of ruff nests (65!) and headstarted a bunch of Southern Dunlins (26!).
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Clemens Küpper @chorlnev.bsky.social · 16/06/2025
Time is up for my brief fieldwork stint at #Liminganlahti. I have to leave right at the hatching peak of the #ruffs but the work is left in the capable hands of a wonderful team.
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Kari Koivula @koivulakari.bsky.social · 07/06/2025
Southern dunlin, endangered living dinosaur. #theropods, #ornithology, #waders
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Kari Koivula @koivulakari.bsky.social · 07/06/2025
Ruff lekking: The co-display of a pale satellite and a court-defending independent morph increases male attractiveness. Lekking began here (65°N) in the first week of May and continues, even though most females are already incubating and the first chicks are expected to hatch any day now.
Ruff male with brownish ornaments co-display with pale-ruffed satellite morph. Female stands by them.
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Jelena Belojevic @jellybb.bsky.social · 05/06/2025
This year we spent long (and cold) nights out to capture #ruffs during peak #lekking. Each one ringed and fitted with a transmitter to help us track their movements and behavior. Thanks to the team for the effort and stamina it takes to pull this off 💤 @koivulakari.bsky.social @chorlnev.bsky.social
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Kari Koivula @koivulakari.bsky.social · 04/06/2025
A female Ruff enters her nest — a tent-like shelter hiding her precious eggs. She’s unringed for now, but she’ll receive her bands once the chicks hatch. #waders #ornithology
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Kari Koivula @koivulakari.bsky.social · 26/05/2025
Opera buffa? No, actually ruff male is dead serious in attracting females flying by to land at his lek. #waders #ornithology
Male ruff at his lek in standing position showing ornamental ruff an ear tufts.
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Kari Koivula @koivulakari.bsky.social · 01/04/2025
Peekaboo! First boreal owl nest for this spring. #helmipöllö #ornithology
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British Ornithologists’ Union (BOU) @bou.org.uk · 24/03/2025
In the LATEST ISSUE of IBIS Disappearing aapa mires and why we should care: unnoticed climate change exacerbates drainage effects on birds | onlinelibrary.wiley.... Anthony D. Fox, Aleksi Lehikoinen | #ornithology 🪶
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Katharine Hayhoe @katharinehayhoe.com · 10/03/2025
It's not real. It's not us. It's not bad. It's too hard to fix. It's too late. Just about every climate denial argument I've ever heard is a variant of one of these five categories, and each one is as bad as the next. Why? Because they all have the same goal: prevent action as long as possible.
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Kari Koivula @koivulakari.bsky.social · 01/03/2025
In large meadows, female ruffs prefer to place their nests close to male leks, even though these are not necessarily the safest locations available #ornithology (Hanna Algora, @chorlnev.bsky.social, @jellybb.bsky.social @vmpakanen.bsky.social et al: onlinelibrary.wiley.com/doi/full/10....
onlinelibrary.wiley.com
Nests, Threats, and Leks: Nonrandom Distributions of Nests in Ruffs (Calidris pugnax)
This project investigates the nest distribution of the ruff (Calidris pugnax), an endangered shorebird. Using satellite imaging, we established a suitable breeding area and analyzed the factors influ....
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Ecology and Evolution @ecol-evol.bsky.social · 28/02/2025
How do female ruffs choose their nest location? onlinelibrary.wiley.com/doi/full/10.... @koivulakari.bsky.social #ornithology
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British Ornithologists’ Union (BOU) @bou.org.uk · 27/02/2025
Increased wind flood frequency leads to decreased nest success of endangered waders in managed shore meadows | www.sciencedirect.co... | Biological Conservation | #ornithology 🪶
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Kari Koivula @koivulakari.bsky.social · 24/02/2025
Our study with @chorlnev.bsky.social, @vmpakanen.bsky.social, @jellybb.bsky.social, and others, using long-term data on dunlins and ruffs, shows that wind floods are a serious threat to the reproduction of waders in the Baltic Sea shore meadows. #ornithology www.sciencedirect.com/science/arti...
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Clemens Küpper @chorlnev.bsky.social · 24/01/2025
A wonderful team effort to characterize the actions of HSD17B2, a gene that helps some #ruff males to dial down their testosterone levels, got published @science.org (1/n)
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Clemens Küpper @chorlnev.bsky.social · 22/01/2025
Hats off! (or rather PhD hat on?). James Tolliver overcame a lot of personal challenges to successfully defend his PhD today. Like the title of his thesis: "Ruff persistence...". Very proud that he has fledged!
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Kari Koivula @koivulakari.bsky.social · 18/01/2025
Northern Finland (65°N) this afternoon after sunset. Polar stratospheric clouds.
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Jelena Belojevic @jellybb.bsky.social · 16/01/2025
Read up this amazing blog with fabulous ruff lekking videos from our last field season 🥰
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Simon Vandepitte @simonvandepitte.bsky.social · 15/01/2025
Who says #nature #documentaries need classical music? In July I also worked on a project related to the #behavioural #ecology of #ruffs. Their #courtship #behaviour is memorizing. My new blog on my website tries to tries to convey this feeling. More: simonvandepitte.com/i-am-sexy-an...
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Clemens Küpper @chorlnev.bsky.social · 16/01/2025
Fieldwork delights. Lekking #ruffs trying to attract females at Liminka Bay, Finland.
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Peter Santema @petersantema.bsky.social · 08/01/2025
New paper out in @rsocpublishing.bsky.social! Research from our group shows that males of the polygynous ruff visit many potential breeding sites within a breeding season, travelling up to 9000 km and visiting up to 23 different sites! royalsocietypublishing.org/doi/10.1098/... 1/7
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Clemens Küpper @chorlnev.bsky.social · 08/01/2025
At the end of last year, we had a flurry of accepted manuscripts that are going to be published over the next weeks. The first one is already out. Those tiny #Ruff 🐥 have personalities - wonderful work by Veronika Rohr published in Ethology doi.org/10.1111/eth.... 🧵 (1/7)
doi.org
Sex and Morph Variation in Activity From Early Ontogeny to Maturity in Ruffs (Calidris pugnax)
We measured the activity (distance travelled in an open-field test) in young ruffs multiple times throughout their first two years of life. Besides the two sexes, ruffs feature three mating morphs (i...
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Graham Appleton @wadertales.bsky.social · 18/12/2024
Aapa mires are really important for Broad-billed Sandpipers, as discussed in recent blog: wadertales.wordpress.com/2024/12/08/b... But climate change and drainage affect many other species too. See paper in @ibisjournal.bsky.social ⬇️ #ornithology
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British Ornithologists’ Union (BOU) @bou.org.uk · 17/12/2024
EARLY VIEW in IBIS Disappearing aapa mires and why we should care: unnoticed climate change exacerbates drainage effects on birds | onlinelibrary.wiley.... Anthony D. Fox, Aleksi Lehikoinen | #ornithology 🪶
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Eoghan Daltun 🌍 @irishrainforest.bsky.social · 06/12/2024
Of all the concepts that humankind needs to absorb + act on with extreme urgency, this tops the list.
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Graham Appleton @wadertales.bsky.social · 02/12/2024
If you read the WaderTales blog about the problems facing Dunlin breeding in the Baltic: wadertales.wordpress.com/2021/06/20/d... You might be interested to learn that head-starting is now being used to try to boost numbers: simonvandepitte.com/sos-baltic-d... #ornithology
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Wouter Vansteelant @wmgvs.bsky.social · 02/12/2024
Phenomenal effort of Rienk Fokkema and the Black-tailed godwit research team @birdeyes-gfn.bsky.social to map mammalian predators of meadow bird nests in the Frisian countryside. #ornithology #conservation doi.org/10.1007/s103...
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Clemens Küpper @chorlnev.bsky.social · 02/12/2024
Very informative blog with stunning impressions of fieldwork and head starting of Baltic #dunlins at #Liminganlahti this year @jellybb.bsky.social @koivulakari.bsky.social @vmpakanen.bsky.social Believe it or not but the blog author @simonvandepitte.bsky.social is still looking for a #PhD position
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Simon Vandepitte @simonvandepitte.bsky.social · 02/12/2024
Hi! I am a biologist, graduated in '23 at Ghent University. I am passionated about #ecology, #conservation and #birds, especially #waders. I am also a #photographer. On my website you can find a blog too. For example about the highly endangered #dunlin from the #Bothnian Bay near #Oulu. Enjoy!
simonvandepitte.com
simon vandepitte - SOS Baltic dunlin
The dunlin is a shorebird species with an extensive distribution in the northern hemisphere. Several subspecies are known, and this blog highlights a particular one: the southern dunlin, or in fancy s...
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The Waterbird Society @waterbirdsociety.bsky.social · 28/11/2024
We're thankful to hear that Wisdom, the world's oldest banded bird, has returned to Midway Atoll for the breeding season AND has already laid an egg! At 74+ years old, Wisdom is changing our understanding of #seabird biology. Welcome back & congrats! #ornithology friendsofmidway.org/wisdom-was-s...
friendsofmidway.org
Wisdom was sighted near her usual nest site on Kuaihelani (Midway Atoll) on November 26, 2024. Her new mate is now incubating their egg!
The oldest known banded bird in the wild, a Mōlī or Laysan albatross known as Wisdom and who is at least 74 years old, has once again mystified biologists. Being able to reproduce and develop an eg…
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Josh Luke Davis 🏳️‍🌈 @joshlukedavis.com · 18/11/2024
well, here it is lads after combing through some 1,400 records, it looks like the slender-billed curlew is indeed extinct and the last known photo taken in 1995 was probably at the point it slipped beneath the waves 🦉🧪 www.nhm.ac.uk/discover/new...
nhm.ac.uk
The slender-billed curlew is declared extinct
This is the first mainland European bird declared extinct in 500 years.
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Graham Appleton @wadertales.bsky.social · 02/11/2024
6/7 Dunlin moves to NEAR THREATENED too. The Baltic has been a focus for research into declines, as discussed here: wadertales.wordpress.com/2021/06/20/d... Dunlin is one of 11 wader species on UK RED LIST: wadertales.wordpress.com/2022/10/04/u... #ornithology
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Kari Koivula @koivulakari.bsky.social · 01/01/2024
Willow tit in snowy boreal forest. Just now in New Year's day -28°C in N Finland, but these birds endure the cold.
Willow tit in snowy forest
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