Andy Gardner

Figure 1. Unbeatable sex allocation strategy of unconstrained females (r*) as a function of proportion of constrained females (p) under local mate competition with two foundresses colonising the patch. Shown are the result for Godfray’s (1990) erroneous diploidy solution (dashed grey line), our corrected diploidy solution (solid grey line), and our haplodiploidy solution (solid black line). Overlaid are results from individual-based simulations (discs).

New paper: "The consequences of constrained sex allocation in diploids and haplodiploids under local mate competition", with Chedhawat Chokechaipaisarn:

doi.org/10.1093/jeb/...

@jevbio.bsky.social

Now all typeset and pretty! A little summary:

It's finally out! This paper took quite a while but I'm so excited to share now! For anyone who studies sex chromosomes, take note: we found a rare "slower X"! (dN/dS_X < dN/dS_Autos) 👀

Faster adaptation but slower divergence of X chromosomes under paternal genome elimination - Nature Communications X chromosomes evolve faster than autosomes, but confounding factors make this a difficult phenomenon to study. Utilising the unusual sex determination system of Sciaridae flies, this study finds a slo...

New paper: "Faster adaptation but slower divergence of X chromosomes under paternal genome elimination" (Open Access)

w/ Robert Baird, @imprintedgene.bsky.social‬, Jan Ševčík, Katy Monteith, @laurarossevo.bsky.social‬ & @ajmongue.bsky.social‬

www.nature.com/articles/s41...

‪@natcomms.nature.com‬

The clonality window: relatedness and the group covariance effect in the evolution of division of labour Abstract. Cellular division of labour is closely associated with the emergence of organismality in the evolution of obligate multicellularity. Michod has s

Very excited to share that our paper, ‘The clonality window: relatedness and the group covariance effect in the evolution of division of labour’, is out now in @journal-evo.bsky.social advances. With @andygardner.bsky.social

doi.org/10.1093/evol...

#OpenAccess #Evolution #Multicellularity

AI-generated image using the paper's title and abstract as input.

New paper: “The clonality window: relatedness and the group covariance effect in the evolution of division of labour”, with @kztwyman.bsky.social #OpenAccess

doi.org/10.1093/evol...

@journal-evo.bsky.social #Image: #ChatGPT #Evolution #OA

Sex-ratio optima for haplodiploid parents converge in viscous populations when dispersal is density-dependent. Read 'Density-dependent dispersal reduces conflict over the sex ratio': royalsocietypublishing.org/doi/10.1098/... #BiologyLetters #evolution

Kin-discriminating partner choice promotes the evolution of helping Abstract. Kin selection theory predicts that individuals should evolve to help relatives, either by helping indiscriminately in a population where they do

New paper with @andygardner.bsky.social and @geoffwild.bsky.social in which we ask whether the ability to recognise relatives causes individuals to be more or less cooperative overall.

doi.org/10.1093/evol...

New paper: "Kin-discriminating partner choice promotes the evolution of helping"

with Tom Scott (@tomwscott.bsky.social) & Geoff Wild (@geoffwild.bsky.social) #OpenAccess

doi.org/10.1093/evol...

@journal-evo.bsky.social #Image: #ChatGPT #Evolution #OA

Kin Competition Drives the Evolution of Earlier Metamorphosis We develop a mathematical model to investigate how kin selection shapes the optimal timing of metamorphosis. We consider the full range of larval competition intensities and the full range of related...

My paper is out! "Kin competition drives the evolution of earlier metamorphosis" (#OpenAccess), with @andygardner.bsky.social

doi.org/10.1002/ece3.70806

New paper: "Kin competition drives the evolution of earlier metamorphosis", with @bingdongevo.bsky.social.

doi.org/10.1002/ece3...

Hello - how nice to be off twitter!
I'm a PhD student at the University of St Andrews studying evolutionary theory (my research profile: tinyurl.com/kztwyman).
Would love to connect with anyone working in evolution, theory, social behaviour etc.!

Join us for our satellite event on selfish genetic elements!

A slide from Tim's talk, featuring a schematic showing how haplodiploid inheritance works, with mothers contributing genes to sons and daughters, and fathers contributing genes only to daughters.

Chedhawat (Tim) has given an online seminar about this sex-ratio work, here:

cassyni.com/events/K7vsZ...

A portion of the title page of the paper. The Abstract reads: Haplodiploids—in particular, wasps—are the workhorses of sex-allocation research. This is owing to their unusual system of sex determination, which provides a ready means of sex ratio adjustment. Notably, their sexually asymmetrical mode of genetic inheritance leads mothers and fathers to come into conflict over the sex ratio of their offspring. In the simplest outbreeding scenario, a mother is favoured to employ an even sex ratio while a father prefers that all his mate’s offspring are female. An important modulator of evolutionary conflict between mating partners is genetic relatedness, raising the possibility that this sex ratio conflict is reduced in low-dispersal settings with mating occurring between relatives. However, the impact of population viscosity on sex ratio conflict in haplodiploids remains unknown. Here, we develop and analyse a kin-selection model to investigate how the rate of dispersal modulates sex ratio conflict in a haplodiploid, viscous population setting. We find that population viscosity is associated with a reduction in the extent of sex ratio conflict—the effect being very weak under density-independent dispersal and much stronger under density-dependent dispersal.

New paper: "Density-dependent dispersal reduces conflict over the sex ratio" (OpenAccess), w/ Chedhawat Chokechaipaisarn.

doi.org/10.1098/rsbl...

Sex-ratio optima for haplodiploid parents converge in viscous populations when dispersal is density-dependent.

One of my undergraduate students, Callum Ferrando, has just published a comic in Journal of Evolutionary Biology. You can find "Taylor's famous result" here:

doi.org/10.1093/jeb/...

@jevbio.bsky.social @uniofstandrews.bsky.social

One of my undergraduate students, Callum Ferrando, has just published a comic in Journal of Evolutionary Biology. You can find "Taylor's famous result" here:

doi.org/10.1093/jeb/...

@jevbio.bsky.social @uniofstandrews.bsky.social

Rock art at Cueva de las Manos, Santa Cruz Province. From Wikipedia: "Cueva de las Manos (Spanish for Cave of the Hands or Cave of Hands) is a cave and complex of rock art sites in the province of Santa Cruz, Argentina, 163 km (101 mi) south of the town of Perito Moreno. It is named for the hundreds of paintings of hands stenciled, in multiple collages, on the rock walls."

New paper: "Kin selection as a modulator of human handedness: sex-specific, parental & parent-of-origin effects" (#OpenAccess), with Bing Dong & Silvia Paracchini (@silparacchini.bsky.social):

doi.org/10.1017/ehs....

#OA #Image commons.wikimedia.org/wiki/File:Cu...

New paper: "Transmission of social status drives cooperation and offspring philopatry", with Antonio Rodrigues (Open Access)

doi.org/10.1098/rspb...

Image of clown anemonefish.

New paper: "Sexual antagonism in sequential hermaphrodites", w/ Thomas Hitchcock (@imprintedgene.bsky.social) *Open Access*

doi.org/10.1098/rspb...

Image: commons.wikimedia.org/wiki/File:Am...

Our new paper on sexual antagonism in sequential hermaphrodites has now been published! royalsocietypublishing.org/doi/full/10....

Population Genetics Group 57 | Plenary Speakers St. Andrews, Scotland

Hi all,

The annual (57th) Population Genetics group conference will be hosted in St Andrews this year (8-10th of Jan 24)

General info, plenary speakers, registration and abstract submission can be found here: www.populationgeneticsgroup.org.uk

We hope to see you there in the new year! :)

A figure from the paper, showing the probability of fixation for alleles of different effect sizes in altruism versus nonsocial scenarios.

New paper: "A geometric approach to the evolution of altruism" (OpenAccess)

sciencedirect.com/science/arti...

Altruism alleles are disfavoured upon their first appearance in the population, when they are not yet shared by kin. This slows the evolution of altruism.

Registration & abstract submission now open for PopGroup 57, 8-10 Jan 2024 in St Andrews:

populationgeneticsgroup.org.uk

This paper is published Open Access, but it's worth pointing out that *all* of the Royal Society's journal content is freely available just now, for "Open Access Week":

royalsociety.org/journals/

Now published online at Notes & Records (Open Access):

royalsocietypublishing.org/doi/10.1098/...

For more background, see:

doi.org/10.1098/rstb...

Notes and Records: the Royal Society journal of the history of science.

New paper: "R.A. Fisher on J.A. Cobb's The Problem of the Sex-Ratio" (OpenAccess)

hdl.handle.net/10023/28453

"Fisher's principle" of the sex ratio was first given by Cobb in 1914. Here I show that Fisher was aware of Cobb's paper.