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Professor Antonín Stratil (1941–2025) was a respected animal geneticist whose six-decade career made lasting contributions to biochemical, molecular and genomic research, education, and service to the scientific community.

As climate change continues, species pushed outside their physiological tolerance limits must adapt or face extinction. When change is rapid, adaptation will largely harness ancestral variation, making the availability and characteristics of that variation of critical importance. Here, we used whole-genome sequencing and genetic-environment association analyses to identify adaptive variation and its significance in the context of future climates in a small Palearctic mammal, the bank vole ( Clethrionomys glareolus ). We found that peripheral populations of bank vole in Britain are already at the extreme bounds of potential genetic adaptation and may require an influx of adaptive variation in order to respond. Analyses of adaptive loci suggest regional differences in climate variables select for variants that influence patterns of population adaptive resilience, including genes associated with antioxidant defense, and support a pattern of thermal/hypoxic cross-adaptation. Our findings indicate that understanding potential shifts in genomic composition in response to climate change may be key to predicting species’ fate under future climates. A species’ response to anthropogenic climate change may depend on its adaptations to past climate changes. Here, the authors use whole-genome resequencing and genetic-environment association to identify genes important for local adaptation and project adaptation under future climate scenarios across bank vole populations in Britain.

Edge populations can harbor unique genetic diversity shaped by historical isolation and play a key role in species’ resilience and range expansion under ongoing climate warming. The Aesculapian snake (Zamenis longissimus) reaches the northern limit of its range in Central Europe, where isolated populations may provide key insights into the species’ evolutionary potential and conservation priorities. In Bohemia (the western Czech Republic), only one reproducing population, in the vicinity of Stráž nad Ohří (SO), had previously been confirmed north of the species’ continuous distribution. Here, we report two additional reproducing populations recently discovered through long-term monitoring: one at the Želinský meander (ZM) and another in Central Bohemia (CB). The ZM population is autochthonous, viable, and genetically remarkable, harboring two divergent mitochondrial haplotypes: the widespread Eastern phylogeographical clade haplotype E1 and a novel haplotype, W10, belonging to the Western clade. This represents the first confirmed record of a Western clade haplotype in the Czech Republic, and only the second known locality within the species’ entire range where both clades coexist. In contrast, the CB population—founded by human-mediated translocation from SO—is expanding dynamically and is represented solely by E1, the only haplotype previously recorded in the country. Our study highlights the importance of incorporating genetic data into conservation planning and understanding species’ evolutionary potential. The mitochondrial diversity uncovered at the ZM exemplifies how historical processes, isolation, and lineage mixing shape contemporary genetic structure. Preserving such populations, which retain unique evolutionary diversity, will be critical for maintaining the resilience of Z. longissimus in Central Europe. More broadly, disjunct northern populations may serve as reservoirs of genetic diversity, enhancing adaptive potential and supporting future range expansion under climate change. Recognizing and conserving this diversity is essential not only for local persistence but also for species-level resilience in a rapidly changing environment.

The North American ecological species Daphniapulicaria and Daphniapulex are thought to have diverged from a common ancestor by adaptation to sympatric but ecologically distinct lake and pond habitats respectively. Based on mtDNA relationships, European D. pulicaria is considered a different species only distantly related to its North American counterpart, but both species share a lactate dehydrogenase (Ldh) allele F supposedly involved in lake adaptation in North America, and the same allele is also carried by the related Holarctic Daphniatenebrosa. The correct inference of the species' ancestral relationships is therefore critical for understanding the origin of their adaptive divergence. Our species tree inferred from unlinked nuclear loci for D. pulicaria and D. pulex resolved the European and North American D. pulicaria as sister clades, and we argue that the discordant mtDNA gene tree is best explained by capture of D. pulex mtDNA by D. pulicaria in North America. The Ldh gene tree shows that F-class alleles in D. pulicaria and D. tenebrosa are due to common descent (as opposed to introgression), with D. tenebrosa alleles paraphyletic with respect to D. pulicaria alleles. That D. tenebrosa still segregates the ancestral and derived amino acids at the two sites distinguishing the pond and lake alleles suggests that D. pulicaria inherited the derived states from the D. tenebrosa ancestry. Our results suggest that some adaptations restricting the gene flow between D. pulicaria and D. pulex might have evolved in response to selection in ancestral environments rather than in the species' current sympatric habitats. The Arctic (D. tenebrosa) populations are likely to provide important clues about these issues.

There is controversy and uncertainty on how far north there were glacial refugia for temperate species during the Pleistocene glaciations and in the extent of the contribution of such refugia to present-day populations. We examined these issues using phylogeographic analysis of a European woodland mammal, the bank vole (Clethrionomys glareolus). A Bayesian coalescence analysis indicates that a bank vole population survived the height of the last glaciation (≈25,000-10,000 years B.P.) in the vicinity of the Carpathians, a major central European mountain chain well north of the Mediterranean areas typically regarded as glacial refugia for temperate species. Parameter estimates from the fitted isolation with migration model show that the divergence of the Carpathian population started at least 22,000 years ago, and it was likely followed by only negligible immigration from adjacent regions, suggesting the persistence of bank voles in the Carpathians through the height of the last glaciation. On the contrary, there is clear evidence for gene flow out of the Carpathians, demonstrating the contribution of the Carpathian population to the colonization of Europe after the Pleistocene. These findings are consistent with data from animal and plant fossils recovered in the Carpathians and provide the clearest phylogeographic evidence to date of a northern glacial refugium for temperate species in Europe.

Rodents constitute a significant proportion of mammalian diversity, with their adaptability and wide distribution making them indispensable study organisms across various biological disciplines. While the laboratory mouse remains a predominant model rodent, the bank vole ( Clethrionomys glareolus ) offers a unique perspective as a wild rodent within the large subfamily Arvicolinae. Recognized for its relevance to studynatural ecology, the bank vole provides insights into complex ecological interactions, evolutionary adaptations, and disease dynamics. Despite recent recognition of its importance in specific research areas, there is a lack of a comprehensive and up-to-date exploration of its role as a model organism. This review addresses this gap by offering a holistic examination of the bank vole’s applications in ecology, evolution, biogeography, disease dynamics, and host–pathogen interactions. We emphasize novel insights into genetic variation, adaptation to climate change, population dynamics, experimental evolution, host-parasite co-evolution, and disease dynamics studies. By consolidating diverse research findings, this review provides a unique and comprehensive perspective on the bank vole’s contributions to understanding ecology and evolution, underscoring its importance as a model organism in shaping future biological research.

The increasing availability of reference genomes for non-traditional model species is enhancing research in ecology and evolution. Here, we present a high-quality chromosome-level genome assembly and annotation for the bank vole Clethrionomys glareolus , an emerging model mammal. The 2.24 Gb assembly is resolved into 28 chromosome-scale scaffolds, consistent with the known karyotype of the species. We predicted 40,393 gene loci, including 21,029 protein-coding genes supported by Swiss-Prot homology. Repetitive elements account for approximately 29% of the genome. The assembly achieves a 90.6% BUSCO score, underscoring its completeness. Compared to previously available fragmented assemblies, this genome enables investigation of genome architecture, selection and structural variation at unprecedented resolution. In particular, this chromosome-level resource supports research into ecological and evolutionary responses to climate variation across space and time. It also holds value for other fields, including developmental biology and studies of immunology and virology, where the bank vole is used as a model for host-pathogen interactions–expanding the relevance of this genomic resource across biological disciplines.

Species‐level environmental niche modeling has been crucial in efforts to understand how species respond to climate variation and change. However, species often exhibit local adaptation and intraspecific niche differences that may be important to consider in predicting responses to climate. Here, we explore whether phylogeographic lineages of the bank vole originating from different glacial refugia (Carpathian, Western, Eastern, and Southern) show niche differentiation, which would suggest a role for local adaptation in biogeography of this widespread Eurasian small mammal. We first model the environmental requirements for the bank vole using species‐wide occurrences (210 filtered records) and then model each lineage separately to examine niche overlap and test for niche differentiation in geographic and environmental space. We then use the models to estimate past [Last Glacial Maximum (LGM) and mid‐Holocene] habitat suitability to compare with previously hypothesized glacial refugia for this species. Environmental niches are statistically significantly different from each other for all pairs of lineages in geographic and environmental space, and these differences cannot be explained by habitat availability within their respective ranges. Together with the inability of most of the lineages to correctly predict the distributions of other lineages, these results support intraspecific ecological differentiation in the bank vole. Model projections of habitat suitability during the LGM support glacial survival of the bank vole in the Mediterranean region and in central and western Europe. Niche differences between lineages and the resulting spatial segregation of habitat suitability suggest ecological differentiation has played a role in determining the present phylogeographic patterns in the bank vole. Our study illustrates that models pooling lineages within a species may obscure the potential for different responses to climate change among populations. We explore whether phylogeographic lineages of the bank vole originating from different glacial refugia show environmental niche differentiation. We found that niches were significantly different between all pairs of lineages in geographic and environmental space and these differences cannot be explained by habitat availability within their respective ranges, suggesting that ecological differentiation has played a role in determining the present phylogeographic patterns in the bank vole.

Understanding the historical contributions of differing glacial refugia is key to evaluating the roles of microevolutionary forces, such as isolation, introgression, and selection in shaping genomic diversity in present‐day populations. In Europe, where both Mediterranean and extra‐Mediterranean (e.g., Carpathian) refugia of the bank vole (Clethrionomys glareolus) have been identified, mtDNA indicates that extra‐Mediterranean refugia were the main source of colonization across the species range, while Mediterranean peninsulas harbor isolated, endemic lineages. Here, we critically evaluate this hypothesis using previously generated genomic data (>6,000 SNPs) for over 800 voles, focusing on genomic contributions to bank voles in central Europe, a key geographic area in considering range‐wide colonization. The results provide clear evidence that both extra‐Mediterranean (Carpathian) and Mediterranean (Spanish, Calabrian, and Balkan) refugia contributed to the ancestry and genomic diversity of bank vole populations across Europe. Few strong barriers to dispersal and frequent admixture events in central Europe have led to a prominent mid‐latitude peak in genomic diversity. Although the genomic contribution of the centrally located Carpathian refugium predominates, populations in different parts of Europe have admixed origins from Mediterranean (28%–47%) and the Carpathian (53%–72%) sources. We suggest that the admixture from Mediterranean refugia may have provisioned adaptive southern alleles to more northern populations, facilitating the end‐glacial spread of the admixed populations and contributing to increased bank vole diversity in central Europe. This study adds critical details to the complex end‐glacial colonization history of this well‐studied organism and underscores the importance of genomic data in phylogeographic interpretation. Previous mtDNA studies indicated that extra‐Mediterranean refugia provided most of the genetic contributions in the bank vole (Clethrionomys glareolus) across its range, while Mediterranean peninsulas harbor isolated, endemic lineages. By analyzing an existing SNP dataset for more than 800 bank voles, we found striking evidence that both extra‐Mediterranean (Carpathian) and Mediterranean (Spanish, Calabrian, and Balkan) refugia contributed to the ancestry and genomic diversity of populations across Europe. We suggest that the admixture from Mediterranean refugia may have facilitated the end‐glacial spread of the admixed populations, contributing to increased bank vole diversity in central Europe.

Daphnia pulex from a pond in Northern Italy shows four distinct defensive morphotypes, varying in the number, location and thickness of neckteeth, as the results of phenotypic plasticity. Because the frequency of the morphotypes was not related to the density of Chaoborus flavicans larvae, the main predators of D. pulex, it has been suggested that environmental factors such as long-day photoperiod, temperature or crowding might act as proximate cues for the predation risk. Here, we analysed the morphotypes of newborn D. pulex produced by mothers not exposed to chemical cues (kairomones) released by Chaoborus, but reared under environmental conditions simulating seasonal differences in predation risk. Three experimental treatments, low temperature and short-day photoperiod (16 °C 12:12 L:D), high temperature and long-day photoperiod (20 °C 14:10 L:D), and crowding under high temperature and long-day photoperiod, were compared for three clonal lineages. Almost 70% of neonates produced one or more neckteeth, but the frequencies of different morphotypes varied significantly among clones and treatments, indicating that both abiotic (temperature and photoperiod) and biotic (crowding) environmental factors affected the development of neckteeth. A characteristic S-shaped relationship between percentages of neckteethed and total juveniles per female further suggests an antipredator adaptation to high prey density. Our findings support that environmental conditions serve as proximate cues of predation risk in D. pulex contributing to the phenotypic plasticity of the neckteeth number.