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Posts by Edward Grey Institute

Plot showing the cumulative percentage of trees in first budburst and first leaf across the Phenoweb Transect since 1 April 2026. Orange line shows southern sites, while the blue line shows northern sites. The black line represents the transect-wide trend.

Plot showing the cumulative percentage of trees in first budburst and first leaf across the Phenoweb Transect since 1 April 2026. Orange line shows southern sites, while the blue line shows northern sites. The black line represents the transect-wide trend.

Oak budburst.

Oak budburst.

Sycamore budburst.

Sycamore budburst.

Beech budburst.

Beech budburst.

Spring is gaining momentum across Scotland. 🌱

Cumulative budburst across the transect has now passed 40%, driven by a surge of activity at our northern sites in recent days. While the North is waking up, the South continues to lead the way in terms of first leaf emergence.

#Phenology #Spring2026

2 days ago 7 4 1 0
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Yesterday, I organised my first workshop with @egioxford.bsky.social ! ✍🏻🖥️
Huge thank you to Dr Alexandra Cones (LMU Munich) for a fantastic introduction to multivariate models in STAN. A really useful, fun session and a great jumping off point for exploring STAN's uses in ecological research!

4 days ago 7 2 1 0
A quick photo of a Great Tit nest in Wytham Woods, taken during standard nest-monitoring protocol. A female Great Tit lying to one side on the nest, with three eggs and two just hatched nestlings visible in a nest constructed of moss and animal hair

A quick photo of a Great Tit nest in Wytham Woods, taken during standard nest-monitoring protocol. A female Great Tit lying to one side on the nest, with three eggs and two just hatched nestlings visible in a nest constructed of moss and animal hair

First sight of a new generation... The first Great Tit eggs have hatched in Wytham Woods this morning.

4 days ago 51 10 1 0
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Very pleased to welcome Dr Alexandra Cones (LMU Munich) for an EGI seminar in @biology.ox.ac.uk at 4pm this Friday 17 April. Alexandra will speak on "Embracing Complexity: Untangling sources of phenotypic variation across scales using birds" - also live-streamed: joining details below: ⬇️

1 week ago 11 5 0 1
A Molecular Phylogeny of the Nightjar Louse Fly Pseudolynchia garzettae (Rondani, 1979) (Diptera: Hippoboscidae) with a Diagnostic Morphological Description of a Sequenced Specimen

NEW PAPER:
We obtained a COXI sequence from a specimen of the parasitic louse/flat fly Pseudolynchia garzettae (Diptera: Hippoboscidae) collected in the UK & provide a full morphological description of the specimen to aid future researchers in case of future taxonomic issues.

2 weeks ago 11 2 0 0
Figure 1: Winter moth life cycle. Adult winter moths emerge in Novem-
ber/December and shortly after mating brachypterous females crawl up
trees to lay eggs. Eggs hatch in early spring, and larvae feed on young
foliage until late May when they descend to the ground on silken threads
to burrow into the soil and pupate. Pupation lasts until winter, when
adults emerge and the life cycle begins again. Solid black arrows indi-
cate the duration of each development stage and blue dashed arrows
indicate the temporal variability of each stage.

Figure 1: Winter moth life cycle. Adult winter moths emerge in Novem- ber/December and shortly after mating brachypterous females crawl up trees to lay eggs. Eggs hatch in early spring, and larvae feed on young foliage until late May when they descend to the ground on silken threads to burrow into the soil and pupate. Pupation lasts until winter, when adults emerge and the life cycle begins again. Solid black arrows indi- cate the duration of each development stage and blue dashed arrows indicate the temporal variability of each stage.

Figure 3: The effect of temperature treatment on pupal development
time. Each coloured point represents the number of days between the
start of the experiment (used as a proxy for pupation date) and the
emergence date of an individual adult moth. Horizontal bars indicate
treatment means and the dashed vertical line separates the experi-
mental treatments from the ambient.

Figure 3: The effect of temperature treatment on pupal development time. Each coloured point represents the number of days between the start of the experiment (used as a proxy for pupation date) and the emergence date of an individual adult moth. Horizontal bars indicate treatment means and the dashed vertical line separates the experi- mental treatments from the ambient.

Figure 5: The effect of temperature treatment on egg development
time. Each coloured point represents the number of days between the
first egg-laying event and half-hatch date of each subclutch. Horizontal
bars indicate treatment means and the dashed vertical line separates
the experimental treatments from the ambient.

Figure 5: The effect of temperature treatment on egg development time. Each coloured point represents the number of days between the first egg-laying event and half-hatch date of each subclutch. Horizontal bars indicate treatment means and the dashed vertical line separates the experimental treatments from the ambient.

Figure 6: The effect of maternal emergence date on offspring’s egg
development time. Points represent subclutches so those aligned in the
x-axis are from the same mother. Lines show the model prediction with
a 95% confidence interval represented by the shaded ribbon. Both are
coloured by egg temperature treatment.

Figure 6: The effect of maternal emergence date on offspring’s egg development time. Points represent subclutches so those aligned in the x-axis are from the same mother. Lines show the model prediction with a 95% confidence interval represented by the shaded ribbon. Both are coloured by egg temperature treatment.

New preprint (part of a programme to understand resilience of the tritrophic tree-insect-bird system to varying climate). We (led by @siennarattigan.bsky.social - her MBiol project) show how temperature in development can carry-over to affect timing at later stages
www.biorxiv.org/content/10.6...

2 weeks ago 9 2 0 0

Yes - the effects of responses to changing averages (typically breeding earlier) are complex when they interact with changes in variability (either directly because of date effects or because increased variability is an additional effect of climate change). The latter has been understudied…

2 weeks ago 1 0 0 0

more generally, the potential for phenological mismatch between different trophic levels, or between different elements of an interacting ecosystem (e.g. plants and specialised pollinators) is a major concern around climate change. 2/2

2 weeks ago 0 0 1 0
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In this specific system, we see that, overall, the tits are maintaining synchrony with the caterpillar peak: both tits and caterpillars seem to respond to similar cues in the environment (see fig- from a 2008 paper, but still holds - we have some work coming out in a few weeks). However 1/2

2 weeks ago 0 0 1 0
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The earliest ever egg-laying in the 80 year long study of Great Tits in Wytham Woods happened this spring. Our first egg was laid on 23 March this year which beats the previous earliest record by 3 days. We've seen a shift of ~16 days in annual average egg laying date since the 1960s

2 weeks ago 1 1 1 0
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New pigeon lofts at work are nearly finished! Looking resplendent. Could possibly Airbnb them out to people.

2 weeks ago 20 2 0 0
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First Pied flycatcher at East Dartmoor today continuing the trend for earlier arrival. Another present at Dunsford Woods today. Also have the earliest ever first tit egg recorded (data starts in 1955) by two days - a Coal tit egg laid yesterday. Discovered with @drroskennerley.bsky.social

3 weeks ago 31 5 0 3
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Really excited to have presented work from my Master’s on the fitness benefits of polyandry at the #ASABSpring2026 Conference in Bristol - and proud to have won best student speaker! ✨

It was a great few days meeting other researchers and listening to all the exciting work happening in the field! 🦋

3 weeks ago 23 7 0 0

Records tumbling across Europe!

3 weeks ago 10 3 0 0

The first egg laid in the first year of the study (1947) was on 27 April, so the difference is 35 days... Though 1947 was a late spring (& this one early...)

3 weeks ago 3 1 0 0
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🚨🚨 Breaking news from Wytham Woods: The 80th year of data collection of the long-term tit study officially started today with this nest with 3 Blue Tit eggs (pic: @mcmahok.bsky.social). First egg inferred 23 March which is our earliest EVER nest - beating the previous record of 26 March by 3 days!🚨🚨

3 weeks ago 62 16 0 3
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This week's EGI seminar (last this term 😢) will be given by Dr Jennifer Morinay from @sheffielduni.bsky.social on the factors affecting helping decisions in the Long-tailed Tit - the UK's only cooperatively breeding bird. Seminar in @biology.ox.ac.uk LT1 on Fri 27 Mar at 3.30. All welcome details ⬇️

4 weeks ago 10 6 0 2
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Such a good EGI seminar from Innes Cuthill today on the ‘survivability onion’ - wide-ranging talk on defensive camouflage in birds, insects and more. One of those seminars that appeals across the department

1 month ago 9 5 0 0
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In a return to his former stamping ground, this week's EGI seminar will be given by Prof Innes Cuthill from @bristolbiosci.bsky.social on how to understand defensive coloration - see if you can spot him in this old photo! Seminar in @biology.ox.ac.uk at 3.30 on Friday - joining instructions below ⬇️

1 month ago 6 5 0 0
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Yesterday's seminar added to our YouTube page - worth a watch if you missed

1 month ago 5 3 0 0
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Fascinating seminar from @pauldufour80.bsky.social today on the role of vagrancy and other rare events in avian ecology and evolution

1 month ago 7 2 0 0

This work is part of @devisatarkar.bsky.social ongoing DPhil research, and a fun collaboration with @davididiaquez.bsky.social @iremsepil.bsky.social @sheldonbirds.bsky.social - and with thanks to the hundreds of people who collected all the @wythamwoods.bsky.social tit data over the years!

1 month ago 5 0 0 0
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In this temperate population, "hot" extremes are still moderate and can even be beneficial when food is abundant. However, as climate variability intensifies, understanding the impacts of extreme weather is key for predicting population resilience to climate change.

1 month ago 3 0 1 0
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Extreme cold & rain also reduce the probability of nestlings recruiting as breeders in following years, while heatwaves make them more likely to do so. However, once their laying date is accounted for, these effects diminish. Breeding timing is the overarching driver of survival in Wytham tits!

1 month ago 4 0 1 0
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Extreme heat and heavy rain together can be far worse than either alone, predicted to reduce fledging mass by up to 27%. Late-season broods are especially vulnerable: under frequent hot extremes, their fledglings can be up to ~35% lighter than early broods despite similar absolute temperatures ☀️🐥⛈️

1 month ago 4 0 1 0
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Cold snaps in the week post-hatching reduce mass, whereas heavy rain is detrimental at later stages. Surprisingly, warm spells seem to benefit growth! We think this may be because heatwaves in Wytham don't reach critical temperatures that can cause heat stress, and instead boost prey availability 🐛

1 month ago 4 0 1 0
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Fledging mass shows a non-linear relationship with temperature, and higher average rainfall during development reduces body mass, especially in older nestlings. Even small mass deficits can have large implications for survival after leaving the nest

1 month ago 5 0 1 0
Preview
Developmental Stage‐Specific Responses to Extreme Climatic Events and Environmental Variability in Great Tit Nestlings Extreme climatic events (ECEs) impact great tit nestlings in a developmental stage-specific and context-dependent manner. Using 60 years of data on 83,000+ great tit nestlings from Wytham Woods, UK, ...

New paper out! Great tits face distinct challenges from extreme weather during development, based on 60 years data from >83k nestlings in Wytham Woods 🐣 Cold snaps & heavy rain can stunt growth, but earlier breeding may help buffer this! By @devisatarkar.bsky.social et al.
doi.org/10.1111/gcb.70794

1 month ago 41 19 2 3
Poster for a seminar - Talk abstract:
Vagrant birds were historically neglected in migration research due to their rarity and the limitations of early tracking methods. Yet, growing research shows that vagrancy can help us better understand several aspects of bird migration and its consequences. In this talk, I will show how abnormal migratory movements can inform key processes in bird migration, including the colonization of new territories, the emergence of novel migration routes, and the navigation systems of migratory birds.​

Poster for a seminar - Talk abstract: Vagrant birds were historically neglected in migration research due to their rarity and the limitations of early tracking methods. Yet, growing research shows that vagrancy can help us better understand several aspects of bird migration and its consequences. In this talk, I will show how abnormal migratory movements can inform key processes in bird migration, including the colonization of new territories, the emergence of novel migration routes, and the navigation systems of migratory birds.​

This week's seminar will be given by @pauldufour80.bsky.social of @vogelwarte.bsky.social on how we can understand bird migration through the study of abnormal movements such as vagrancy. Lecture held in @biology.ox.ac.uk at 3.30 on Fri 13 March - all welcome; online joining instructions ⬇️

1 month ago 15 7 0 2
Screenshot of the EGI seminars You-tube Channel

Screenshot of the EGI seminars You-tube Channel

We've uploaded recordings of many of our seminars over the last few months to our You-tube channel, including from @cornishjackdaws.bsky.social, Kristen Ruegg, Daniel Field, @jon-slate.bsky.social, Paul Acker, @thelabandfield.bsky.social & @kokkonut.bsky.social - Enjoy!

www.youtube.com/@EGIOxford

1 month ago 36 20 0 1