Journal of Evolutionary Biology最新文献

{"title":"Maintenance and loss of microbe-mediated protection in the absence of pathogens.","authors":"Melinda Kemlein, Lena Peters, Hinrich Schulenburg, Nancy Obeng","doi":"10.1093/jeb/voaf090","DOIUrl":"https://doi.org/10.1093/jeb/voaf090","url":null,"abstract":"<p><p>Protective microbes are known for their service to hosts. While they allow hosts to survive infection, microbes, too, benefit from successful inhibition of incoming pathogens. Under constant pathogen exposure, protective symbionts should thus be selected for. Yet, it is less clear if, and how, microbe-mediated protection is maintained in symbionts in the absence of pathogen pressure. Addressing the stability of protective symbiosis during bacterial adaptation to healthy hosts, we studied microbe-mediated protection of Pseudomonas lurida MYb11 against pathogenic Bacillus thuringiensis Bt247 in its natural host Caenorhabditis elegans MY316. Specifically, we assessed host protection and in vitro inhibition of the pathogen for a collection of derived MYb11 isolates, which were previously evolved during serial passaging in healthy C. elegans hosts. We found that all evolved MYb11 isolates continued to inhibit the pathogen in vitro, while most, albeit not all, continued to protect hosts. We focused on two of these isolates, MT5 and MT11, one with and one without protection, and found that intact protection is associated with high symbiont colonization and resulting lower pathogen proportions. In sum, our study dissects the stability of a natural protective symbiosis and suggests that high colonization ability ensures microbe-mediated protection, even if microbes adapt to host association in the absence of pathogen selection.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144676380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complex genetic determinism of male-fertility restoration in the gynodioecious snail Physa acuta.","authors":"Elpida Skarlou, Fanny Laugier, Kévin Béthune, Timothée Chenin, Jean-Marc Donnay, Céline Froissard, Patrice David","doi":"10.1093/jeb/voaf093","DOIUrl":"https://doi.org/10.1093/jeb/voaf093","url":null,"abstract":"<p><p>Male fertility in plants is often controlled by the interaction between mitochondrial and nuclear genes. Some mitotypes confer cytoplasmic male sterility (CMS), making the individual male-sterile, unless the nuclear background contains alleles called restorers, that suppress the effects of CMS and restore the hermaphroditic phenotype. Restorers in cultivated crops are often alleles with strong and dominant effect, but in wild plants, data often suggest more complex systems. Here, we characterized the inheritance and specificity of restoration in a new CMS model, the freshwater snail Physa acuta. We explored two different populations (i) a naive population i.e., without contact with CMS in the past 80 generations, (ii) a non-naive population, where CMS is present and largely restored. Although we found male fertility of individuals with CMS mitogenomes to be heritable in both contexts, this genetic determinism was of a different nature depending on population history. In naive populations not coevolved with CMS the background variation may include alleles that happen to act as weak quantitative modifiers of the penetrance of CMS, while in populations coevolved with CMS, selection may have favored, when such variants were available, the emergence of strong alleles with a dominant effect.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144651021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Noise pollution and artificial light at night alter selection pressures on sexual signals in an urban adapter.","authors":"Andrew D Cronin, Rotem Zilber, Paul Jerem, Wouter Halfwerk","doi":"10.1093/jeb/voaf092","DOIUrl":"https://doi.org/10.1093/jeb/voaf092","url":null,"abstract":"<p><p>Human-induced environmental changes can have major impacts on how individuals communicate. Species using sexual signals may experience especially rapid shifts in their interactions with both intended receivers (mates) and eavesdroppers (predators). Artificial light at night and anthropogenic noise represent two major environmental features of human-dominated habitats which may alter selection pressures imposed on sexual signalers. In this study, we used a full factorial design to investigate individual and combined effects of experimentally added light and noise pollution on the attraction of female frogs and bat predators to speakers broadcasting male túngara frog (Engystomops pustulosus) calls. We conducted two-choice tests in the field to examine if predatory and mating preferences for signals differing in conspicuousness change in response to noise and light pollution. Light pollution reduced the number of approaches from predators and mates attracted to our playbacks. The addition of noise pollution enhanced this effect on predators but decreased it for female frogs. Light also lowered female frog preference for conspicuous calls, but this effect was counteracted when noise pollution was added. Reduced numbers of predators and female frogs found under lit conditions suggest light pollution can both reduce natural selection and increase sexual selection pressures on male signals. These findings indicate light pollution could be responsible for the reduced numbers of predatory bats and female frogs found in urban environments, providing a causal explanation for more conspicuous and attractive sexual signaling in males from urban populations.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144638590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: The role of evolving niche choice in herbivore adaptation to host plants.","authors":"","doi":"10.1093/jeb/voaf086","DOIUrl":"https://doi.org/10.1093/jeb/voaf086","url":null,"abstract":"","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144627632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intergenic polyA/T tracts explain the propensity of yeast de novo genes to encode transmembrane domains.","authors":"Nikolaos Vakirlis, Timothy Fuqua","doi":"10.1093/jeb/voaf089","DOIUrl":"https://doi.org/10.1093/jeb/voaf089","url":null,"abstract":"<p><p>New genes can emerge de novo from non-genic genomic regions. In budding yeast, computational predictions have shown that intergenic regions harbor a higher-than-expected propensity to encode transmembrane domains, if theoretically translated into proteins. This propensity seems to be linked to the high prevalence of predicted transmembrane domains in evolutionarily young genes. However, what accounts for this enriched propensity is not known. Here we show that specific arrangements of polyA/T tracts, which are abundant and enriched in yeast intergenic regions, explain this observation. These tracts are known to function as Nucleosome Depleted Regions, which prevent or reduce nucleosome formation to enable transcription of surrounding genes. We provide evidence that these polyA/T tracts have been repeatedly coopted through de novo gene emergence for the evolution of novel small genes encoding proteins with predicted transmembrane domains. These findings support a previously proposed \"transmembrane-first\" model of de novo gene birth and help explain why evolutionarily young yeast genes are rich in transmembrane domains. They contribute to our understanding of the process of de novo gene evolution and show how seemingly distinct but potentially interacting levels of functionality can exist within the same genomic loci.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144620979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Context-dependent effects of developmental and adult diet on life-history traits in Drosophila melanogaster.","authors":"Mohankumar Chandrakanth, Nishant Kumar, Chand Sura, Sudipta Tung","doi":"10.1093/jeb/voaf091","DOIUrl":"https://doi.org/10.1093/jeb/voaf091","url":null,"abstract":"<p><p>Life-history traits such as body size, reproduction, survival, and stress resistance are fundamental to an organism's fitness and are highly influenced by nutritional environments across life stages. In this study, we employed a full factorial experimental design to investigate the effects of isocaloric diets (diets with equal caloric content but differing macronutrient composition) on key life-history traits in an outbred Drosophila melanogaster population. Our results demonstrated significant diet-induced plasticity, with male wing length (a proxy for body size) being influenced by the developmental diet; males reared on carbohydrate-rich developmental diets had larger wings as adults. Fertility increased with protein-rich diets at both developmental and adult stages, reaffirming the critical role of dietary protein in enhancing reproductive success. Lifespan exhibited sexually dimorphic responses to diet: carbohydrate-rich developmental diets extended male lifespan, while carbohydrate-rich adult diets reduced lifespan in both sexes. Stress resistance traits, including starvation and desiccation resistance, were unaffected by developmental diets but were influenced by adult diets, with carbohydrate-rich adult diets enhancing survival under both stress conditions in males and females. Importantly, while most traits exhibited additive effects of nutrition across life stages, a marginal interaction for male starvation resistance suggests that developmental and adult diets can interact in a trait- and sex-specific manner. Moreover, associations between dietary effects on life-history traits were context-dependent, driven primarily by adult diets and varying by sex. These findings emphasize the profound role of stage-specific nutritional environments in modulating life-history traits and their correlations, offering valuable insights into how organisms may adapt to changing ecological conditions and highlighting the importance of considering both developmental and adult dietary contexts in evolutionary studies.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144620978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The consequences of constrained sex allocation in diploids and haplodiploids under local mate competition.","authors":"Chedhawat Chokechaipaisarn, Andy Gardner","doi":"10.1093/jeb/voaf088","DOIUrl":"https://doi.org/10.1093/jeb/voaf088","url":null,"abstract":"<p><p>Unmated females in haplodiploid populations may enjoy reproductive success but with the constraint that all their offspring-developing from unfertilised eggs-are male. The presence of such females, constrained to produce only male offspring, is expected to lead to a corresponding female bias being favoured among the offspring of unconstrained females. Godfray (J Evol Biol 3, 3-17) derived a mathematical expression for the unbeatable sex allocation strategy for unconstrained females in the context of local mate competition in two-foundress patches, and concluded that there is negligible impact of the presence of constrained females on the unbeatable sex allocation of unconstrained females. However, Godfray's result assumes diploid-rather than haplodiploid-genetics and his derivation contains a mathematical error. We correct Godfray's error and extend his model to incorporate haplodiploid genetics. This results in a more substantial impact of constrained females on the sex allocation behaviour of unconstrained females under local mate competition.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144585521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Independent evolution of atypical sperm morphology in a passerine bird.","authors":"Melissah Rowe, Daniel M Hooper, Antje Hofgaard, Laura L Hurley, Callum S McDiarmid, Ioanna Pataraia, Jan T Lifjeld, Simon C Griffith","doi":"10.1093/jeb/voaf087","DOIUrl":"https://doi.org/10.1093/jeb/voaf087","url":null,"abstract":"<p><p>Spermatozoa exhibit striking morphological variation across the animal kingdom. In passerine birds, sperm exhibit considerable variation in size, yet the basic sperm phenotype is highly conserved; sperm are filiform, the head is corkscrew-shaped, and the midpiece is elongated and twisted around the flagellum. A significant departure from this typical sperm morphology has been reported in the sister species, the Eurasian bullfinch (Pyrrhula pyrrhula) and Azores bullfinch (P. murina). Here, we report a second evolutionary shift in passerine sperm phenotype in the nominate subspecies of the red-browed finch (Neochmia temporalis temporalis); sperm are non-filiform, with an ellipsoid head, and an extremely short midpiece restricted to the nuclear-axoneme junction. Additionally, we show that the sperm phenotype of the red-browed finch is similar to the putatively neotenous sperm described in the two bullfinch species. Using whole-genome data, we found no evidence that the unusual sperm phenotype of the red-browed finch is associated with reduced genetic variation or a population bottleneck. In contrast, using data on relative testes size, we find some support for the hypothesis that relaxed post-copulatory sexual selection, via a lack of sperm competition, may, at least in part, explain the unusual sperm of the red-browed finch. We also discuss the possible roles of mutation, genetic drift, and genetic hitchhiking, in the evolutionary origins and maintenance of neotenous sperm phenotypes. Finally, we suggest that these dramatic evolutionary shifts in sperm phenotype warrant further investigation and highlight the need for a greater understanding of the developmental and genomic basis of sperm phenotype.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144561824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dispersal and the evolution of sex differences in cooperation in cooperatively breeding birds and mammals.","authors":"Patrick Fenner, Thomas E Currie, Andrew J Young","doi":"10.1093/jeb/voaf080","DOIUrl":"https://doi.org/10.1093/jeb/voaf080","url":null,"abstract":"<p><p>Sex differences in cooperation are widespread, but their evolution remains poorly understood. Here we use comparative analyses of the cooperatively breeding birds and mammals to formally test the leading Dispersal Hypothesis for the evolution of sex differences in cooperation. The Dispersal Hypothesis predicts that, where both sexes delay dispersal from their natal group, individuals of the more dispersive sex should contribute to natal cooperation at lower rates (either because leaving the natal group earlier reduces the downstream direct benefit from natal cooperation or because dispersal activities trade-off against natal cooperation). Our comparative analyses reveal support for the Dispersal Hypothesis; sex biases in dispersal predict sex biases in helper contributions to cooperative care within the natal group across cooperative birds and mammals. Strikingly, in every species that showed significant sex biases in both dispersal and natal helping, the direction of sex bias in dispersal predicted that in natal helping in the manner predicted by the Dispersal Hypothesis. Our analyses also suggest that these patterns cannot be readily attributed instead to alternative hypothesized drivers of sex differences in cooperation (kin selection, heterogamety, paternity uncertainty, patterns of parental care or differences between birds and mammals). These findings help to clarify the evolutionary drivers of sex differences in cooperation and highlight the need for single-species studies to tease apart whether sex differences in dispersal predict sex differences in natal cooperation because dispersal impacts the direct benefits of natal cooperation (as is often proposed) or because activities that promote dispersal trade-off against natal cooperation.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144545885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanisms of colour-production modulate the link between extra-pair paternity and avian sexual dichromatism.","authors":"Cristina-Maria Valcu, Mihai Valcu, Kaspar Delhey, Bart Kempenaers","doi":"10.1093/jeb/voaf085","DOIUrl":"https://doi.org/10.1093/jeb/voaf085","url":null,"abstract":"<p><p>Most birds are socially monogamous, but extra-pair paternity (EPP) is widespread. EPP can increase variance in male reproductive success and the opportunity for sexual selection, potentially leading to sexual dichromatism. While the link between EPP and sexual dichromatism is well established, over two decades ago Owens & Hartley (1998) suggested that this relationship is mainly driven by structural colours, that is, colours that are created by the interaction between light and the feather microstructure, presumably because of their role in active sexual displays. However, this conclusion was based on a small sample of species. Here we expand these analyses investigating the relationship between EPP and male and female colouration produced by three colour-producing mechanisms-melanin-based, carotenoid-based, structural colouration-across over 400 bird species. Our results reveal that EPP relates to coloration across all three mechanisms. In species with high EPP levels, males tend to have more black and less light brown whereas females are often more cryptically coloured, with less red and blue. Species with high EPP levels also exhibited more colour-producing mechanisms. Our study suggests that EPP can enhance sexual dichromatism by favouring conspicuous male and cryptic female colouration.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144530783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}