Drosophila pseudoobscura third chromosome inversion arrangements have sex-specific effects on life history traits

This study on *Drosophila pseudoobscura* reveals that while temperature and specific inversion genotypes significantly influence sex-specific life history traits like lifespan and development, the lack of observed correlations between these traits fails to provide clear evidence for ongoing sexual conflict or evolutionary trade-offs, suggesting such conflicts may have been resolved or do not manifest as predicted by current models.

Reyes Castellon, G. A., Aimadeddine, G., Chiao, C. R. + 15 more2026-04-08📄 evolutionary biology

Evolutionary analysis of V protein pseudogenization in an RNA editing-deficient paramyxovirus

This study demonstrates that the V protein region in Human parainfluenza virus type 1 (HPIV-1) has undergone specific pseudogenization characterized by a significant excess of stop codons, confirming that the loss of RNA editing led to the functional decay of this ancestral reading frame rather than maintaining it under overlapping coding constraints.

Rakib, T. M., Akter, L., Matsumoto, Y.2026-04-08📄 evolutionary biology

A single locus carrying modified oogenesis genes underlies the switch to asexuality in Artemia brine shrimp

By integrating single-nucleus RNA sequencing and whole-genome sequencing of backcrossing experiments, this study identifies a specific 8-megabase region on the Z chromosome containing two differentially expressed oogenesis genes, *ITPR* and *USP8*, as the likely genetic basis for the switch from sexual to asexual reproduction in *Artemia* brine shrimp.

Elkrewi, M., Kopcak, D., Macon, A. + 1 more2026-04-08📄 evolutionary biology

Interplay between purging and admixture shapes genetic load in an invasive guppy population

This study demonstrates that in an invasive guppy population, the interplay between the purging of strongly deleterious alleles and admixture with native populations creates a complex spatial gradient of genetic load, where strong mutations accumulate at the expansion front while weakly deleterious variants are reduced by gene flow.

Burda, K., Janecka, M. J., Mohammed, R. S. + 5 more2026-04-07📄 evolutionary biology

Ancient Ryukyu Jomon contributed to past and current genetic structure of Japanese populations

By sequencing 273 modern and 25 ancient genomes, this study reveals that the Ryukyu Jomon population diverged from mainland Jomon groups around 6,900 years ago, experienced severe bottlenecks, and later admixed with mainland migrants approximately 1,000 years ago, thereby shaping the distinct genetic structure of contemporary Ryukyu populations.

Matsunami, M., Kawai, Y., Speidel, L. + 23 more2026-04-07📄 evolutionary biology

Organism-Environment Topological Interfaces Drive the Origination of Organismal Form

This paper proposes that topological interfaces between organisms and their environment, specifically the transformation from spherical to disk or cylinder shapes driven by resource transport constraints, serve as the primary mechanism for the origination of organismal form, motility, and rapid diversification, offering a unifying framework that addresses limitations in classical evolutionary theories.

Li, W., Zhang, X.2026-04-07✓ Author reviewed 📄 evolutionary biology

Septins regulate cytokinesis and multicellular development in the closest living relatives of animals

This study demonstrates that septins in the choanoflagellate *Salpingoeca rosetta*, the closest living relatives of animals, are essential for regulating cytokinesis, cell size, and multicellular colony development, suggesting that the evolution of animal multicellularity involved adapting cell division mechanisms to meet the mechanical demands of cell adhesion.

Carver, M., King, N.2026-04-07📄 evolutionary biology

Environment heterogeneity creates fast amplifiers of natural selection in graph-structured populations

This paper demonstrates that environmental heterogeneity in graph-structured populations can significantly amplify natural selection and accelerate the fixation of beneficial mutants, particularly when migration is frequent and mutants possess a stronger fitness advantage in demes with high outflow, or when migration is rare and heterogeneity creates refugia.

Fruet, C., Alexandre, A., Abbara, A. + 2 more2026-04-05📄 evolutionary biology

Genomic offsets predict observed kelp declines and suggest benefits of assisted migration in the Northeast Pacific

This study validates the use of seascape genomics to predict kelp declines in the Northeast Pacific by demonstrating a strong correlation between genomic offsets and observed population losses, thereby supporting assisted migration as an effective strategy to mitigate future climate-driven extirpation risks.

Hernandez, F., Bemmels, J. B., Starko, S. + 2 more2026-04-04📄 evolutionary biology