Mark Yeldham

Studying shad on the River Severn 🐟
Mostly tweeting about science, nature, and occasional nonsense. Instagram 📷: markyeldham

[Mark Yeldham @MYeldham]

Second swift back this morning

[Mark Yeldham @MYeldham]

The first swift is home and settled down.

[Mark Yeldham @MYeldham]

@WriterHannahBT Yes, first swifts back yesterday as well

[Mark Yeldham @MYeldham]

Back of the camera shot of the world's greatest ever photo of a cuckoo! 😅 (bottom left) Probably the first (and last) time I've ever seen one before I've heard one. Saw my first swallows of the year as well. Norfolk Broads.

[Mark Yeldham @MYeldham]

Lovely new wildlife pond replacing the old leaky one in Heigham Park @NorwichCC

[Mark Yeldham @MYeldham]

@kloppman1970 @ITV They are feral black swans that nest during the winter.

[Mark Yeldham @MYeldham]

Oh, Faraaz! 🤦 #TheTraitors

[Mark Yeldham @MYeldham]

@jasperfforde Early Riser 2?

[𝕏 Travels, Hotels and Resorts @em3dia]

Russian city of Kamchatka buried by a
historic snow. Don’t think I’ve ever seen anything like this before. This is truly another level
🎥 fatos_desconhecidosdompedrito | IG

[Mark Yeldham @MYeldham]

Shit photo 🤔

[Mark Yeldham @MYeldham]

I can see the bloody Aurora Borealis right now, in Norwich, in the cloud and rain! Is that even possible? @aurorawatchuk @VirtualAstro

[Mark Yeldham @MYeldham]

Probably someone shiny green lasers at the sky 🤣

[Mark Yeldham @MYeldham]

@AnimalEcology Nice. Not sure the fish in the graphic will be moving anywhere fast though! 💀

[Mark Yeldham @MYeldham]

New tongue twister: Frankie flamingo flew to France

[BBC News (UK) @BBCNews]

Missing flamingo thought to be living in France https://t.co/uHOplSLh7j

[Mark Yeldham @MYeldham]

Just had a flock of ~15 parakeets fly over my house in Norwich. Had no idea there was a population here.

[Mark Yeldham @MYeldham]

When were we supposed to get this emergency alert? Or have @ThreeUK mucked up again?

[Mark Yeldham @MYeldham]

@MarkSmyth1960 @BBCSpringwatch Very nice. Mark of Bristol Swifts had the start of a second brood this year as well, although the adults eventually ejected the eggs as only one was incubating https://t.co/dxa5QqrrKO He mentioned that there have been a handful of records of second broods as well.

[Mark Yeldham @MYeldham]

@WriterHannahBT Not since the start of the week

[Mark Yeldham @MYeldham]

The second looks at the response of shad and sea lamprey to different methods of restoring river connectivity. It finds that weir modification restored river connectivity, whilst fish passes allowed fish to pass barriers on significantly lower flows: https://t.co/GDFqOXiI5n

[Mark Yeldham @MYeldham]

I'm happy to share two new publications on the influence of migration barriers on anadromous fish migrations.

[Mark Yeldham @MYeldham]

The first discusses the influence of the tidal cycle on migration delays for twaite shad at head-of-tide weirs, finding significant migration delays, where passage was limited to windows of high tidal influence: https://t.co/NChM1q5gCb