{"title":"Resource presentation dictates genetic and phenotypic adaptation in yeast.","authors":"Neetika Ahlawat, Anjali Mahilkar, Supreet Saini","doi":"10.1186/s12862-025-02361-3","DOIUrl":"10.1186/s12862-025-02361-3","url":null,"abstract":"<p><strong>Background: </strong>Environments shape adaptive trajectories of populations, often leading to adaptive parallelism in identical, and divergence in different environments. However, how does the likelihood of these possibilities change with minute changes in the environment remain unclear.</p><p><strong>Results: </strong>In this study, we evolved Saccharomyces cerevisiae in environments which differed only in the manner in which the sugar source is presented to the population. In one set of populations, carbon was presented as a mixture of glucose-galactose, and in the other, as melibiose, a glucose-galactose disaccharide. Since the two environments differed in how the two monosaccharides are packaged, we call these environments 'synonymous'. Our results show that even subtle environmental differences can lead to differing phenotypic responses between the two sets of evolved populations. However, despite different adaptive responses, pleiotropic effects of adaptation are largely predictable. We also show that distinct genomic targets of adaptation between the two sets of evolved populations are functionally convergent.</p><p><strong>Conclusion: </strong>This study highlights how subtle environmental differences dictate phenotypic and genetic adaptation of populations. Additionally, these results also suggest the predictive potential of ancestor's fitness in understanding pleiotropic responses. Our work underscores the importance of studying more such environments to understand the generality of adaptive responses in populations.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"33"},"PeriodicalIF":2.3,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11998346/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144033909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Enzo E Seculi Pereyra, Damian E Pérez, Ariel H Méndez
{"title":"Macroevolutionary trends in Ceratosauria body size: insights of phylogenetic comparative methods.","authors":"Enzo E Seculi Pereyra, Damian E Pérez, Ariel H Méndez","doi":"10.1186/s12862-025-02374-y","DOIUrl":"https://doi.org/10.1186/s12862-025-02374-y","url":null,"abstract":"<p><p>Patterns of body size evolution in dinosaurs are relevant for understanding the evolutionary trends that have shaped the disparity of phenotypes observed in the fossil record. In this sense, previous studies have suggested that Abelisauridae followed Cope´s rule and Noasauridae exhibited a phylogenetic trend towards decreasing body size. However, the absence of a comprehensive analysis including ecological, phylogenetic and socio-sexual factors make it necessary to reevaluate body size evolution in Ceretatosauria under a modern phylogenetic comparative approach. Therefore, we aimed to test whether body size evolved in Ceratosauria in accordance with Cope´s rule, evaluate what factors best explain differences in body size within Ceratosauria and examine what patterns of evolution rates, selection strength and constrain explain the diversification body size in Ceratosauria. Differences in body size were found between specialized taxa (= Late Cretaceous abelisaurids) and \"generalized taxa\" (= Outgroups + Noasauridae). This results suggested that the presence of a specialized feeding strategy in Late Cretaceous abelisaurids was associated with differences in body size, regardless of the phylogenetic topology and evolutionary model used. Additionally, the low levels of morphological disparity, low evolutionary rates for taxa with a specialist feeding behavior in Brownian motion model and the fossil record suggest that the evolution of body size in Late Cretaceous abelisaurids was constrained. The cursorial abilities suggested for abelisaurids joined with the specialized predation strategy could have constrained the increase in body size in Late Cretaceous abelisaurids after the extinction of carcharodontosaurids. On the other hand, Noasauridae exhibited a phylogenetic trend towards decreased body size, likely to avoid niche overlap with medium size theropods and minimize structural and maintenance cost while living in stressful environments and having a generalist diet. Understanding how the dynamics of dinosaur communities, such as competition and predator-prey interactions, operated in South America during the Late Cretaceous is crucial for reconstructing the evolutionary and ecological processes that shaped its unique faunal assemblage. Futures works should be focus on process-based community-evolution model and species distribution modeling to further understand the macroevolution dynamics of South America dinosaur community.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"32"},"PeriodicalIF":2.3,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11994025/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144058907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Population stratification in Northern shrimp (Pandalus borealis) off Iceland evident from RADseq analysis.","authors":"Áki Jarl Láruson, Hafrún Gunnarsdóttir, Jake Goodall, Snæbjörn Pálsson, Ingibjörg G Jónsdóttir","doi":"10.1186/s12862-025-02369-9","DOIUrl":"https://doi.org/10.1186/s12862-025-02369-9","url":null,"abstract":"<p><p>The northern shrimp Pandalus borealis (ice. Stóri kampalampi) is a North Atlantic crustacean of significant commercial interest which has been harvested consistently in Icelandic waters since 1936. In Icelandic waters, the length at which this protandrous species transitions from male to female differs between the inshore and offshore populations, suggesting a biologically meaningful stratification which may or may not be plastic. Using reduced representative genomes assembled from RADseq data, sampled from 96 individuals collected at two time points (2018 and 2021), we compare the level of genetic structure across a gradient extending out of Skjálfandi bay, north Iceland. These data are compared to samples from a far offshore site, some 65 km out from the bay, as well as another inshore fjord in Arnarfjörður, in northwestern Iceland. Since 1999, no harvesting of inshore populations of P. borealis in Skjálfandi has been allowed due to stock decline, but harvesting of offshore stocks has continued. Uncertainty surrounding the extent of structure between the in- and offshore aggregations has remained. Here we report distinct genetic structure defining the inshore and offshore populations of northern shrimp, but find significant admixture between the two. Most importantly, we see that genetically inshore populations of northern shrimp extend far outside the harvest boundaries of inshore shrimp, and offshore individuals may exhibit punctuated migration into the inshore areas.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"31"},"PeriodicalIF":2.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11987239/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144057903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Blanca R Peto, Claudinéia P Costa, Meghan E Moore, S Hollis Woodard
{"title":"Social control of egg-laying in independently nest-founding bumble bee queens.","authors":"Blanca R Peto, Claudinéia P Costa, Meghan E Moore, S Hollis Woodard","doi":"10.1186/s12862-025-02364-0","DOIUrl":"https://doi.org/10.1186/s12862-025-02364-0","url":null,"abstract":"<p><strong>Background: </strong>Evolution has shaped diverse reproductive investment strategies, with some organisms integrating environmental cues into their reproductive decisions. In animal societies, social cues can further influence reproductive decisions in ways that might support the survival and success of the social group. Bumble bees are a lineage of eusocial insects wherein queens initiate nests independently. Bumble bee queens enter their eusocial phase only after successfully rearing their first offspring and thereafter exhibit an increased rate of egg-laying. We tested the idea that during bumble bee nest initiation, queen reproduction is socially context-dependent and under the control of social conditions in the nest.</p><p><strong>Results: </strong>Our findings reveal that in the bumble bee Bombus impatiens, queen egg-laying follows a dynamic, stereotypical pattern and is also heavily influenced by social group members. During the initial stages of nest initiation, accelerated egg-laying in queens is associated with the presence of workers or older larvae and pupae. Moreover, workers are required for queens to maintain increased levels of egg laying across the nest initiation stage. We also confirmed a previously-described pattern where queens temporarily decelerate egg-laying early in nest-founding, only to increase it again when the first adult workers are soon to emerge. This \"pause\" in egg-laying was observed in all B. impatiens queens as well as in additional species examined.</p><p><strong>Conclusions: </strong>Our results support the idea that eusocial systems can employ socially context-dependent control of queen egg-laying as a reproductive strategy. In some solitary-founding lineages, including bumble bees, queens may reach their full reproductive potential only after the emergence of the first adult workers, who then take over brood care. This stands in contrast to the hyper-reproductivity observed in some eusocial species. The presence of workers and older brood (who will soon eclose) not only alleviates queen brood care responsibilities but may also provide signals that cause queens to increase their reproductive output. These phenomena may allow queens to adapt their reproductive output to the conditions of the colony. Broadly, these findings highlight the dynamic interplay between social conditions and reproduction in bumble bees.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"30"},"PeriodicalIF":2.3,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11980249/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144031689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Prince Degny Vale, Ernest Dadis Bush Fotsing, Samedi Jean Pierre Mucyo, Williams Danladi Abwage, Serge Ely Dibakou, Kouame Paul N'Goran, Tenekwetche Sop, Yntze van der Hoek, Stefanie Heinicke, Lars Kulik, Inza Kone, Hjalmar Kuehl
{"title":"Retraction Note: Great ape abundance and per capita carbon storage in their habitats.","authors":"Prince Degny Vale, Ernest Dadis Bush Fotsing, Samedi Jean Pierre Mucyo, Williams Danladi Abwage, Serge Ely Dibakou, Kouame Paul N'Goran, Tenekwetche Sop, Yntze van der Hoek, Stefanie Heinicke, Lars Kulik, Inza Kone, Hjalmar Kuehl","doi":"10.1186/s12862-025-02371-1","DOIUrl":"10.1186/s12862-025-02371-1","url":null,"abstract":"","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"29"},"PeriodicalIF":2.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11974002/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nebiyou Masebo, Emiru Birhane, Serekebrehane Takele, Araceli Perez-Sanz, Juan J Lucena, Zerihun Belay, Agena Anjulo, Felipe Yunta
{"title":"Glomalin related soil protein, soil aggregate stability and soil aggregate-associated organic carbon under agroforestry practices in southern Ethiopia.","authors":"Nebiyou Masebo, Emiru Birhane, Serekebrehane Takele, Araceli Perez-Sanz, Juan J Lucena, Zerihun Belay, Agena Anjulo, Felipe Yunta","doi":"10.1186/s12862-025-02365-z","DOIUrl":"10.1186/s12862-025-02365-z","url":null,"abstract":"<p><p>Land degradation in Ethiopia is escalating due to high population density and the shift from tree-based agricultural systems, like agroforestry practices (AFP), to monoculture farming. These land use changes, compounded by climate change, threaten biodiversity and soil resources. Key soil health parameters, such as glomalin, soil aggregation, and aggregate stability, are negatively impacted by such practices. Agroforestry is proposed as a sustainable alternative to address these challenges. This study aimed to evaluate the effects of AFPs on soil glomalin, soil aggregate stability (mean weight diameter, MWD), and the relationship between soil aggregates and soil organic carbon (SOC). Undisturbed soil samples were collected from 0 to 30 cm and 30-60 cm depths in four land use types: home garden (HAFP), cropland (ClAFP), woodlot (WlAFP), and trees on soil and water conservation-based agroforestry (TSWAFP). Results showed significantly higher glomalin-related soil protein (GRSP) in HAFP and WlAFP compared to ClAFP and TSWAFP (p < 0.05). HAFP also exhibited the highest soil aggregate stability (SAS) and MWD, followed by WlAFP. These findings suggest that agroforestry practices can significantly enhance soil health, ecosystem stability, and long-term sustainability, contributing to land restoration efforts.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"28"},"PeriodicalIF":2.3,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11966829/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143775158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chia-Ling Fong, Daphne Z Hoh, Huai Su, Peng-Yu Chen, Chia-Chen Tsai, Kelly W H Tseng, Hao-Chih Huang, Jun-Yi Wu, Yoko Nozawa, Benny K K Chan
{"title":"Crowdsourcing conservation: unveiling Taiwan's sea turtle foraging grounds, emerging threats, and residency with broad societal engagement.","authors":"Chia-Ling Fong, Daphne Z Hoh, Huai Su, Peng-Yu Chen, Chia-Chen Tsai, Kelly W H Tseng, Hao-Chih Huang, Jun-Yi Wu, Yoko Nozawa, Benny K K Chan","doi":"10.1186/s12862-025-02354-2","DOIUrl":"10.1186/s12862-025-02354-2","url":null,"abstract":"<p><strong>Background: </strong>Determining sea turtle foraging grounds, emerging threats, and population status are essential for conservation management. Crowdsourced science is a recently recognized approach that enables internet-based data collection, providing important contributions to scientific goals while also benefiting society and public education. This study is based on the published dataset from TurtleSpot Taiwan (2017-2022) with the aim to leverage crowdsourced data to determine sea turtle foraging grounds, emerging threats, demography, and residency patterns in Taiwan.</p><p><strong>Results: </strong>We identified three green turtle (Chelonia mydas) foraging grounds in Taiwan (Liuqiu Island, Kenting, and Green Island), defined as sites with > 100 sightings and > 50 individuals. Among all sites, Liuqiu Island contributed 77% of the total sightings, suggesting this island is a hotspot. Emerging threats to foraging aggregations of sea turtles in Taiwan were evident from the reported sightings, with ~ 10% of the total sightings involving turtles with fishing line entanglement, ingested debris, missing flippers, or injuries. Most of these sightings occurred in Liuqiu Island, indicating a significant level of human-turtle disturbance. Residency patterns identified from sighting data showed that 43.4% of individuals stayed in the same area for one or more years, with adult-sized turtle residency greater than that of immature turtles.</p><p><strong>Conclusions: </strong>Taiwan supports healthy foraging grounds for green turtles, where adults often stay for more than one year and with dynamic populations of younger individuals. However, despite a certain number of foraging green turtles observed in Liuqiu Island, many of these turtles displayed injuries. This high population density combined with increased injury frequency suggests that a comprehensive management plan for turtle foraging grounds is urgently needed, including measures to reduce boat speeds in hotspot areas and strict regulations on coastal human activity.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"27"},"PeriodicalIF":2.3,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11931839/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143702532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ana Paula Schaan, Lorenna Costa, Diego Santos, Antonio Modesto, Marcos Amador, Camile Lopes, Sílvia Helena Rabenhorst, Raquel Montenegro, Bruno D A Souza, Thayson Lopes, France Keiko Yoshioka, Giovanny Pinto, Vivian Silbiger, Ândrea Ribeiro-Dos-Santos
{"title":"Editorial Expression of Concern: mtDNA structure: the women who formed the Brazilian northeast.","authors":"Ana Paula Schaan, Lorenna Costa, Diego Santos, Antonio Modesto, Marcos Amador, Camile Lopes, Sílvia Helena Rabenhorst, Raquel Montenegro, Bruno D A Souza, Thayson Lopes, France Keiko Yoshioka, Giovanny Pinto, Vivian Silbiger, Ândrea Ribeiro-Dos-Santos","doi":"10.1186/s12862-025-02366-y","DOIUrl":"10.1186/s12862-025-02366-y","url":null,"abstract":"","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"26"},"PeriodicalIF":2.6,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11927178/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alan Moura de Oliveira, Geize Aparecida Deon, Alexandr Sember, Caio Augusto Gomes Goes, Weerayuth Supiwong, Alongklod Tanomtong, Fábio Porto-Foresti, Ricardo Utsunomia, Thomas Liehr, Marcelo de Bello Cioffi
{"title":"Repetitive DNAs and differentiation of the ZZ/ZW sex chromosome system in the combtail fish Belontia hasselti (Perciformes: Osphronemidae).","authors":"Alan Moura de Oliveira, Geize Aparecida Deon, Alexandr Sember, Caio Augusto Gomes Goes, Weerayuth Supiwong, Alongklod Tanomtong, Fábio Porto-Foresti, Ricardo Utsunomia, Thomas Liehr, Marcelo de Bello Cioffi","doi":"10.1186/s12862-025-02358-y","DOIUrl":"10.1186/s12862-025-02358-y","url":null,"abstract":"<p><strong>Background: </strong>Java combtail fish Belontia hasselti (Cuvier, 1831), a member of the Osphronemidae family, inhabits lakes and rivers throughout Southeast Asia and Sri Lanka. Previous cytogenetic research revealed it possesses a diploid chromosome number of 48 chromosomes with a female-heterogametic ZZ/ZW sex chromosome system, where the W chromosome is distinguishable as the only metacentric element in the complement. Female-heterogametic sex chromosome systems seem to be otherwise surprisingly rare in the highly diverse order Perciformes and, therefore, B. hasselti provides an important comparative model to evolutionary studies in this teleost lineage. To examine the level of sex chromosome differentiation in B. hasselti and the contribution of repetitive DNAs to this process we combined bioinformatic analyses with chromosomal mapping of selected repetitive DNA classes, and comparative genomic hybridization.</p><p><strong>Results: </strong>By providing the first satellitome study in Perciformes, we herein identified 13 satellite DNA monomers in B. hasselti, suggesting a very low diversity of satDNA in this fish species. Using fluorescence in situ hybridization, we revealed detectable clusters on chromosomes only for four satellite DNA monomers. Together with the two mapped microsatellite motifs, the repeats primarily accumulated on autosomes, with no distinct clusters located on the sex chromosomes. Comparative genomic hybridization showed no region with accumulated female-specific or enriched repeats on the W chromosome. Telomeric repeats terminated all chromosomes, and no additional interstitial sites were detected.</p><p><strong>Conclusion: </strong>These data collectively indicate a low degree of sex chromosome differentiation in B. hasselti despite their considerable heteromorphy. Possible mechanisms that may underlie this pattern are discussed.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"25"},"PeriodicalIF":2.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11917085/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143652237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alyssa R Cirtwill, Tomas Roslin, Pablo Peña-Aguilera, Agathe Agboto, William Bercê, Svetlana N Bondarchuk, Robert Brodschneider, Behzad Heidari, Camara Kaizirege, Justine Muhoro Nyaga, Ojonugwa Ekpah, Gonzalo Ossa Gomez, Claudia Paz, Christian Pirk, Amir Salehi-Najafabadi, Anneli Salonen, Chantal Soloniaina, Helena Wirta
{"title":"The Latitudinal Biotic Interaction Hypothesis revisited: contrasting latitudinal richness gradients in actively vs. passively accumulated interaction partners of honey bees.","authors":"Alyssa R Cirtwill, Tomas Roslin, Pablo Peña-Aguilera, Agathe Agboto, William Bercê, Svetlana N Bondarchuk, Robert Brodschneider, Behzad Heidari, Camara Kaizirege, Justine Muhoro Nyaga, Ojonugwa Ekpah, Gonzalo Ossa Gomez, Claudia Paz, Christian Pirk, Amir Salehi-Najafabadi, Anneli Salonen, Chantal Soloniaina, Helena Wirta","doi":"10.1186/s12862-025-02363-1","DOIUrl":"10.1186/s12862-025-02363-1","url":null,"abstract":"<p><strong>Background: </strong>Contrasting hypotheses suggest that the number of biotic interactions per species could either increase towards the equator due to the increasing richness of potential interaction partners (Neutral theory), or decrease in the tropics due to increased biotic competition (Latitudinal Biotic Interaction Hypothesis). Empirical testing of these hypotheses remains limited due to practical limitations, differences in methodology, and species turnover across latitudes. Here, we focus on a single species with a worldwide distribution, the honey bee (Apis mellifera L.), to assess how the number of different types of interactions vary across latitudes. Foraging honey bees interact with many organisms in their local environment, including plants they actively select to visit and microbes that they largely encounter passively (i.e., unintentionally and more or less randomly). Tissue pieces and spores of these organisms are carried to the hive by foraging honey bees and end up preserved within honey, providing a rich record of the species honey bees encounter in nature.</p><p><strong>Results: </strong>Using honey samples from around the globe, we show that while honey bees visit more plant taxa at higher latitudes, they encounter more bacteria in the tropics.</p><p><strong>Conclusions: </strong>These different components of honey bees' biotic niche support the latitudinal biotic interaction hypothesis for actively-chosen interactions, but are more consistent with neutral theory (assuming greater bacterial richness in the tropics) for unintentional interactions.</p>","PeriodicalId":93910,"journal":{"name":"BMC ecology and evolution","volume":"25 1","pages":"24"},"PeriodicalIF":2.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11912709/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143652413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}