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Edward Grey Institute

@egioxford.bsky.social

62 Following470 Followers

Research Institute in Dept of Biology at University of Oxford studying all aspects of Behaviour, Ecology and Evolution of Birds in natural environments. Follow us for updates on science, seminars, jobs & field projects: https://egioxford.web.ox.ac.uk/

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@egioxford.bsky.socialOct 13, 2026, 7:24 AM

Excellent long discussion with Daisy about her DPhil research on social networks in great tits with @jorgensoraker.bsky.social. Very nice to have long enough to go into depth on a full DPhil project.

@egioxford.bsky.socialOct 13, 2026, 7:21 AM

Pleased to announce first EGI seminar of 2026-27 with @erikpostma.bsky.social from @uniexecec.bsky.social talking about Evolutionary Dynamics & Constraints on Avian Reproductive Effort. Abstract in ALT-text. Erik's seminar is at 3.30 in LT2 in LaMB @biology.ox.ac.uk. All welcome; also streamed ⬇️

Seminar poster abstract: In search of the evolutionary forces and constraints that shape the dynamics of reproductive effort
Although central to life-history theory and a potentially powerful evolutionary constraint, the predicted trade-off between reproduction and survival remains remarkably elusive. Here I will build upon the so-called Y-model that emphasises the roles of variation in resource acquisition vs. allocation in shaping life-history correlations. In particular, I will distinguish between genetic and environmental sources of variation in resource allocation and acquisition, and between phenotypic and genetic patterns of covariance on the one hand, and the trade-off function that describes the relationship between resource allocation to, for example, reproduction versus survival, on the other. I will illustrate this using empirical studies of three species—humans, quails and great tits—in which we quantified the lifespan-cost of reproduction. Using complementary approaches, I will show how women reproducing when resources are scarce, great tits genetically predisposed to lay large clutches, and quails artificially bred to invest more in reproduction all live shorter lives. Thereby I will provide empirical evidence for a lifespan-cost of reproduction across a range of life-history strategies, and highlight its role in shaping the evolutionary dynamics of reproductive effort.
@egioxford.bsky.socialSep 24, 2026, 6:46 AM

New preprint from @devisatarkar.bsky.social et al: How does the correlation between body mass as a nestling and and adult change with the environment? Using the covariance reaction norm approach, we find lots of variation. See Devi's thread below ⬇️

www.biorxiv.org/content/10.6...

@egioxford.bsky.socialSep 10, 2026, 6:53 PM

New paper in @animalecology.bsky.social led by @davididiaquez.bsky.social published today. We document a reduction of ~5% in body mass of adult great tits at Wytham (>1 sd!) over ~45 years and show best explained by natal environment carry-over
besjournals.onlinelibrary.wiley.com/doi/10.1111/...

@egioxford.bsky.socialSep 1, 2026, 11:37 AM

The potential for non-linear effects of higher temperatures is concerning; we need support for long-term studies (like the Wytham tits - which just collected 80th year of data) to understand the consequences of rare events 4/4.

@egioxford.bsky.socialSep 1, 2026, 11:36 AM

We show that it was associated with elevated mortality and reduced growth - in contrast to the effects of high temperatures that are less extreme which seem to be beneficial (see @devisatarkar.bsky.social et al paper from earlier this year: onlinelibrary.wiley.com/doi/full/10....) 3/n

@egioxford.bsky.socialSep 1, 2026, 11:33 AM

A new preprint led by @davididiaquez.bsky.social analysed the effects of this exceptional event: (2/n)

www.biorxiv.org/content/10.6...

@egioxford.bsky.socialSep 1, 2026, 11:32 AM

Remember the summer heatwaves in the UK in 2026? The late May heatwave was exceptional: an event +4.3 sd above mean - likely to occur only once every few decades under normal conditions. It was also unusual in being early and coinciding with tit breeding season. What consequences did it have? 🧵1/n

@ghtrabin.bsky.socialAug 28, 2026, 8:53 AMReposted by @egioxford.bsky.social

Delighted that my master's project @biology.ox.ac.uk about social trade-offs in a wild population of birds is now published in Animal Behaviour @asab.org doi.org/10.1016/j.an... 🧵

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