Bacillus toyonensis biovar Thuringiensis: an overlooked entomopathogen?

This paper highlights the emerging recognition of *Bacillus toyonensis* biovar *Thuringiensis* as an overlooked entomopathogen capable of producing insecticidal parasporal crystals via horizontally transferred megaplasmids, underscoring the necessity for genome-based taxonomic reassessment within the *Bacillus cereus* group to correct historical misclassifications.

Sauka, D. H., Peralta, C., Del Valle, E. E. + 1 more2026-03-12📄 evolutionary biology

Assessing the Evolutionary Trajectory of Arbuscular Mycorrhizal Conserved Genes in Seagrasses and Aquatic Close Relatives

By analyzing 65 genomes and transcriptomes, this study reveals that while aquatic plants in the order Alismatales have largely lost the specific genetic machinery required for arbuscular mycorrhizal associations through independent gene losses, the retention of certain conserved symbiosis genes in some lineages suggests they may still engage in alternative fungal symbioses.

Ettinger, C. L., Arroyo, J., Stajich, J. E.2026-03-12📄 evolutionary biology

The Tangled History and Taxonomy of an Iconic Chorus Frog Complex Clarified using Genomic Analyses

Using extensive geographic sampling and thousands of nuclear loci, this study clarifies the phylogenetic relationships within the Pacific Treefrog complex, revealing recent divergence with gene flow between lineages and proposing a revised two-species taxonomy that recognizes *Pseudacris regilla* and *Pseudacris hypochondriaca*.

McDaniels, C. X., Povelikin, N., Dye, M. + 7 more2026-03-12📄 evolutionary biology

Reconstructing the demographic history of blacklegged ticks (Ixodes scapularis) in the northern United States

This study utilizes genomic data and approximate Bayesian computation to reveal that northern blacklegged tick populations in the US originated from multiple independent relictual lineages following the Last Glacial Maximum rather than a single source expansion, a finding with critical implications for managing vector-borne diseases.

Dong, D.-y., Schoville, S. D.2026-03-12📄 evolutionary biology

Gene network centrality affects parallel evolution and local adaptation in wild yeast

This study demonstrates that gene network architecture, specifically the centrality and connectivity of genes within a network, serves as a mechanistic predictor for whether evolutionary adaptation in wild yeast will be repeatable (parallel) or contingent, with highly connected genes driving parallel evolution and peripheral genes facilitating rapid, non-parallel local maladaptation.

Subramanian, S., Bolnick, D. I.2026-03-12📄 evolutionary biology

From genes to collective modes: biological constraints shape metabolic evolution

By integrating population genetics with flux balance analysis, this study demonstrates that biological constraints within genotype-phenotype maps drive metabolic evolution toward simple, reproducible dynamics organized by "evolutionary collective modes" rather than individual genes, a finding supported by both theoretical simulations and re-analysis of Lenski's long-term evolution experiment.

Brown, A., Datta, S., Mehta, P. + 1 more2026-03-12📄 evolutionary biology

Resurrected in the field: benefits of rapid adaptation to historic drought seen mainly at the leading edge of a plant' species range

A resurrection study of *Erythranthe laciniata* reveals that rapid contemporary adaptation to historic drought conditions has enhanced fitness at the species' high-elevation leading edge, while persistent low fitness at lower elevations suggests an impending range contraction under continued climate change.

Pennington, L. K., Sexton, J. P.2026-03-12📄 evolutionary biology

Spider mite genotypes with higher growth rate suffer more from competition but exert stronger reproductive interference

This study demonstrates that in the spider mite *Tetranychus cinnabarinus*, genetic variation drives a trade-off where genotypes with higher intrinsic growth rates are more sensitive to food competition but exert stronger reproductive interference on heterospecifics, highlighting the importance of genetic correlations across trophic and sexual traits in species interactions.

Cruz, M. A., Zele, F., Gaspar, R. + 4 more2026-03-11📄 evolutionary biology

Effects of deleterious mutations on the fixation of chromosomal inversions on autosomes and sex chromosomes

Using individual-based simulations, this study demonstrates that while deleterious mutations generally reduce the fixation probability of chromosomal inversions on autosomes and sex chromosomes through mechanisms like Muller's ratchet, inversions can still occasionally fix if they carry a low mutation load or benefit from sheltering effects, potentially driving the evolution of recombination arrest.

Roze, D., Lenormand, T.2026-03-11📄 evolutionary biology

The role of miscarriage and sororal birth order in male same-sex orientation: Theoretical predictions and empirical data

This study combines theoretical modeling and empirical data from eight populations to demonstrate that while the Fraternal Birth Order Effect is robustly supported, the observed Sororal Birth Order Effect and higher prevalence of male same-sex orientation among only-children suggest that maternal miscarriages and potentially additional mechanisms beyond the Maternal Immune Hypothesis play a significant role in the development of male sexual orientation.

Raymond, M., Aguerre, A., Durand, V. + 8 more2026-03-11📄 evolutionary biology