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Genetic structure and common ancestry expose the dingo-dog hybrid myth
Andrew R Weeks and others
The evolutionary history of canids has been shown to be complex, with hybridization and domestication confounding our understanding of speciation among various canid lineages. The dingo is a recent canid lineage that was completely isolated from other canids for over 5000 years on the Australian mainland, but the ...
Parallel and convergent evolution in genes underlying seasonal migration
Luz E Zamudio-Beltrán and others
Seasonal migration has fascinated scientists and natural historians for centuries. While the genetic basis of migration has been widely studied across different taxa, there is little consensus regarding which genomic regions play a role in the ability to migrate and whether they are similar across species. Here, we examine ...
Hiding in plain sight: the Y chromosome and its reinvigorated role in evolutionary processes
Wouter van der Bijl and Judith E Mank
Recent methodological approaches have expanded our understanding of Y chromosome sequence, revealed unexpected Y diversity, and sparked a growing realization of its importance in evolutionary processes. To fully understand the diversity and importance of the Y chromosome, we suggest the need to move from a holotype Y ...
Drosophila melanogaster pigmentation demonstrates adaptive phenotypic parallelism over multiple spatiotemporal scales
Skyler Berardi and others
Defining the predictability and pace of adaptation in wild populations are key aims of evolutionary biology, and we explored these dynamics using Drosophila melanogaster abdominal pigmentation as a model phenotype. We sought to understand whether pigmentation patterns vary in a consistent manner across three independent spatiotemporal axes: wild populations sampled over a latitudinal cline, wild populations sampled across seasons, and experimental populations sampled across seasons in field mesocosms. We measured abdominal melanization patterns following common garden treatment and found that pigmentation evolves as a parallel response across all scales, in which reduced melanization is associated with warmer temperatures. These patterns were also associated with variation in known pigmentation genes. The parallel shifts in pigmentation across shared environmental axes provide strong evidence that this complex trait is evolving adaptively; thus, we demonstrate for the first time that pigmentation adapts predictably to environmental variation over ecological timescales.
Reproductive output of old males is limited by seminal fluid, not sperm number
Krish Sanghvi and others
What causes an old male to reproductively fail? Is it his sperm or seminal fluid? In fruit flies, old males produce fewer offspring than young males. But surprisingly, old males are not sperm limited. Instead, the reproductive decline is caused by females storing fewer sperm of old males. But why do females store fewer sperm of old males? Possibly because old males lack high-quality seminal fluid, which we demonstrate by rescuing the fertility of old males after supplementing the female with a young male’s seminal fluid.

Latest Articles

Replicate geographic transects across a hybrid zone reveal parallelism and differences in the genetic architecture of reproductive isolation
Georgy Semenov and others
Published: 07 May 2025
Determining the genetic architecture of traits involved in adaptation and speciation is one of the key components of understanding the evolutionary mechanisms behind biological diversification. Hybrid zones provide a unique opportunity to use genetic admixture to identify traits and loci ...
Correction to: Positive correlations in susceptibility to a diverse panel of viruses across Drosophilidae host species
Published: 11 April 2025
This is a correction to: Ryan M Imrie, Megan A Wallace, Ben Longdon, Positive correlations in susceptibility to a diverse panel of viruses across Drosophilidae host species, Evolution Letters , 2025, qraf002, https://doi.org/10.1093/evlett/qraf002 In the originally published version of this ...
Drosophila melanogaster pigmentation demonstrates adaptive phenotypic parallelism over multiple spatiotemporal scales
Skyler Berardi and others
Published: 08 April 2025
Defining the predictability and pace of adaptation in wild populations are key aims of evolutionary biology, and we explored these dynamics using Drosophila melanogaster abdominal pigmentation as a model phenotype. We sought to understand whether pigmentation patterns vary in a consistent manner across three independent spatiotemporal axes: wild populations sampled over a latitudinal cline, wild populations sampled across seasons, and experimental populations sampled across seasons in field mesocosms. We measured abdominal melanization patterns following common garden treatment and found that pigmentation evolves as a parallel response across all scales, in which reduced melanization is associated with warmer temperatures. These patterns were also associated with variation in known pigmentation genes. The parallel shifts in pigmentation across shared environmental axes provide strong evidence that this complex trait is evolving adaptively; thus, we demonstrate for the first time that pigmentation adapts predictably to environmental variation over ecological timescales.
Landscape structure as a driver of eco-evolution in host–parasite systems
Jhelam N Deshpande and others
Published: 01 April 2025
Spatial network structure of biological systems drives ecology and evolution by distributing organisms and their genes. The ubiquitous host–parasite systems are no exception. However, past theoretical work has largely focused on simple spatial structures, such as grids, hampering the translation of ...
Do the “big four” orders of insects comprise evolutionarily significant higher taxa with coherent patterns of selection on protein-coding genes?
Pierre J Février and Timothy G Barraclough
Published: 06 March 2025
Higher taxa are normally considered to be arbitrary levels in the branching tree of life, with no level having greater or lesser significance for evolutionary processes than any other. But are some higher taxa more significant than others for evolution? This article asks whether the big four orders of holometabolous insects comprise evolutionarily significant units showing divergent but internally conserved patterns of selection on protein-coding genes.
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