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Jørgen Søraker

@jorgensoraker.bsky.social

106 followers 118 following 40 posts

DPhil student at the Edward Grey Institute, University of Oxford

Posts Replies Media

Jørgen Søraker @jorgensoraker.bsky.social · 26/06/2026

I stepped out during the Japan-Sweden match last night. Resulted in a spotted crake. Ran inside to get it on the kitchen-list, the most important list that is!

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Jørgen Søraker @jorgensoraker.bsky.social · 19/03/2026

Can you spot the bird in the picture? Really looking forward to the EGI seminar tomorrow that will be given by Prof Innes Cuthill on defensive coloration! Also streamed, so contact us if you want to tune in! Details below⬇️

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Jørgen Søraker @jorgensoraker.bsky.social · 04/03/2026

Also, we found that the correlation in selection for laying date and clutch size for great tits and blue tits were highly correlated, both when using number of fledglings and number of recruits as fitness components. This suggests that they share (at least correlated) drivers of selection!

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Jørgen Søraker @jorgensoraker.bsky.social · 04/03/2026

We found that selection varies mostly temporally and in a spatio-temporal interaction. Only a small proportion of the variation in selection was due to consistent differences among the subpopulations, suggesting that these subpopulations experience mostly similar selection regimes.

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Jørgen Søraker @jorgensoraker.bsky.social · 04/03/2026

In general, we detected non-linear selection for earlier laying date and larger clutch size for both great tits and blue tits.

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Jørgen Søraker @jorgensoraker.bsky.social · 04/03/2026

Selection can vary spatially, temporally or in a combination of those two. Using mixed-effect modelling we decomposed the variation in selection into these three components.

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Jørgen Søraker @jorgensoraker.bsky.social · 06/01/2026

Still present! Incredibly cooperative bird showing excellent for about 100 birders today.

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Jørgen Søraker @jorgensoraker.bsky.social · 10/08/2025

During house sparrow fieldwork this week at Helgeland, Northern Norway, we also managed to read the ring number of this common tern. Ringed as juvenile bird at Seal Sands, Teesmouth in August 2016, 1509 km away. Busy carrying fish back to the local colony.

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Jørgen Søraker @jorgensoraker.bsky.social · 19/07/2025

Last fledge check of the season home in Norway today. Very low production this year, with most of the early broods failing. However, rather high density, with eggs in 137/186 boxes. Distribution: Great tit 76 Blue tit 24 Pied flycatcher 27 (record high) Coal tit 7 Nuthatch 2 Marsh tit 1

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Jørgen Søraker @jorgensoraker.bsky.social · 13/05/2025

Indeed!

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Jørgen Søraker @jorgensoraker.bsky.social · 30/04/2025

It’s like poetry!

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Jørgen Søraker @jorgensoraker.bsky.social · 03/04/2025

The first great tit (and blue tit) egg in my round for the season! Marley Plantation early as always🥚

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Jørgen Søraker @jorgensoraker.bsky.social · 25/03/2025

Todays nest-box round revealed some nests close to completion. Not many had started building tho. Yet! Also produced a less fancy Strava-map than @davididiaquez.bsky.social, but still looks cool from above!

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Jørgen Søraker @jorgensoraker.bsky.social · 21/03/2025

Wonderful last couple of days at @portlandbirdobs.bsky.social! Med gulls, sandwich terns, black redstart, purple sandpipers, little owls, avocets, ring ouzels, lots of newly arrived migrants and more! All this in wonderful EGI company

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