Proceedings. Biological sciences最新文献_第7页

Evolutionary parsimony: an equilibrium refinement that sharply constrains the space of outcomes in games with multiple equilibria. 进化简约：在具有多个平衡的游戏中，一种严格限制结果空间的均衡优化。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-09-01 Epub Date: 2025-09-24 DOI: 10.1098/rspb.2025.0941

Jean-Baptiste André

{"title":"Evolutionary parsimony: an equilibrium refinement that sharply constrains the space of outcomes in games with multiple equilibria.","authors":"Jean-Baptiste André","doi":"10.1098/rspb.2025.0941","DOIUrl":"10.1098/rspb.2025.0941","url":null,"abstract":"Evolutionary game theory loses much of its predictive power in games with multiple equilibria. For such games, this article introduces a simple and general refinement principle, grounded in evolutionary dynamics, that sharply narrows the set of possible outcomes. Rather than designing strategies from scratch, evolution shapes them gradually through the accumulation of adaptive mutations, the vast majority of which have small effects. This process can be approximated heuristically by assuming that smaller-effect (and therefore more probable) mutations always occur first, while ignoring the unlikely possibility that larger-effect mutations arise earlier. This approximation gives rise to a principle of adaptive parsimony: at each step, evolution proceeds through the simplest beneficial change available. As a result, most theoretically possible equilibria are actually unreachable, as they would require a transition where a large-effect mutation fixes despite a simpler alternative being available. What remains is a small subset of equilibria that seem intuitively reasonable from a biological perspective: those that (i) preserve ecological symmetry, (ii) do not rely on non-credible threats and (iii) avoid the bizarre behavioural patterns predicted by the folk theorem in repeated games.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2055","pages":"20250941"},"PeriodicalIF":3.5,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12457035/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145133423","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}

引用次数: 0

Autosomally-encoded segregation distortion of sex chromosomes. 性染色体常染色体编码分离畸变。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-27 DOI: 10.1098/rspb.2025.1085

Naomi L Greenberg, Manus M Patten, Martijn A Schenkel

{"title":"Autosomally-encoded segregation distortion of sex chromosomes.","authors":"Naomi L Greenberg, Manus M Patten, Martijn A Schenkel","doi":"10.1098/rspb.2025.1085","DOIUrl":"https://doi.org/10.1098/rspb.2025.1085","url":null,"abstract":"Some selfish genetic elements drive at meiosis to achieve transmission distortion, breaking the rules of Mendelian segregation to enhance their own evolutionary success. It has been shown that enhancers of drive must act in cis in order to gain the selfish benefit of drive and that suppressors of drive will be selected at unlinked loci. Here, we model the evolution of an autosomal trans-acting gene (Distorter) that causes the Y chromosome (or even 0 chromosome) to drive without driving itself, a phenomenon we call 'remote-control meiotic drive'. We show that such a gene may spread in the population when linked to a second locus, Assister, whose alleles are transmitted at different frequencies through sperm as compared to eggs, for which we consider various scenarios, such as sexually antagonistic selection or sex-limited drive. Depending on the mechanistic details of sex-chromosome drive, Distorter's spread can additionally facilitate transitions between XY and X0 sex determination. Our results provide a proof of principle that stretches the current understanding of segregation modifier and sex allocation theory. Moreover, we identify alternative evolutionary trajectories that could also lead to remote control drive and discuss its potential applications in developing synthetic sex-ratio-distorting elements for use in pest management, for example.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"1085"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12380499/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144986937","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}

引用次数: 0

Salamander ecomorphology reveals a unique suite of climbing adaptations. 蝾螈的生态形态揭示了一套独特的攀爬适应性。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-27 DOI: 10.1098/rspb.2025.1295

Jonathan M Huie, Grace Park, Sandy M Kawano

{"title":"Salamander ecomorphology reveals a unique suite of climbing adaptations.","authors":"Jonathan M Huie, Grace Park, Sandy M Kawano","doi":"10.1098/rspb.2025.1295","DOIUrl":"https://doi.org/10.1098/rspb.2025.1295","url":null,"abstract":"Many salamanders climb extensively but lack morphological adaptations, such as claws or adhesive toe pads, found in other climbing tetrapods. Here, we compared climbers and non-climbers from the salamander genera Aneides and Plethodon to evaluate potential morphological adaptations for climbing across multiple levels of biological organization. We integrated body shape morphometrics, allometry of the autopods (manus and pes), mechanical advantage of the digits and comparisons of epithelial microstructures. Compared with non-climbers, climbers have longer limbs that likely facilitate faster climbing and have larger and positively allometric autopods that likely yield superior clinging performance. Longer digits increase climbing reach at the expense of grip force, but climbers circumvent this trade-off with phalangeal morphologies that increase the mechanical advantage of their digits. A few species also have pes epithelia that may increase adhesion or friction but epithelial morphology was largely uncorrelated with habitat use. While scansorial species of Aneides and Plethodon share some characteristics with other genera of climbing salamanders, our results reveal subtle differences between rock-climbing and tree-climbing salamanders that reflect distinct selective pressures imposed by their microhabitats. Many-to-one mapping enables alternate strategies to address the challenges of climbing and helps to explain the abundance and diversity of climbing tetrapods.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"20251295"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12380490/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144986957","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}

引用次数: 0

Nutrient niche dynamics among wild pollinators. 野生传粉媒介的营养生态位动态。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-27 DOI: 10.1098/rspb.2025.0643

Justin A Bain, Jane E Ogilvie, William K Petry, Paul J CaraDonna

{"title":"Nutrient niche dynamics among wild pollinators.","authors":"Justin A Bain, Jane E Ogilvie, William K Petry, Paul J CaraDonna","doi":"10.1098/rspb.2025.0643","DOIUrl":"https://doi.org/10.1098/rspb.2025.0643","url":null,"abstract":"Food underpins fitness and ecological interactions, yet how nutrient availability shapes species interactions in natural communities remains poorly understood. Most nutritional ecology research focuses on laboratory or single-species systems, limiting insight into how nutrient use and nutrient niche dynamics occur in complex, multispecies assemblages in the wild. We combined long-term plant-pollinator interaction data with pollen macronutrient analyses to examine how wild bumble bees exploit macronutrients and whether they occupy distinct nutrient niches. Pollen macronutrient composition varied across plant species and over the season, with protein-rich pollen peaking in spring and lipid- and carbohydrate-rich pollen increasing by late summer. Across this nutrient landscape, bumble bee species occupied two distinct macronutrient niches: one high in protein and low in lipid and carbohydrate, and the other lower in protein but moderate in lipid and carbohydrate. Nutrient niche partitioning was associated with differences in feeding morphology and colony life stage (but not phenology). We found little evidence that nutrient niche breadth differed among species or was explained by feeding morphology or colony life stage. Our results extend nutritional ecology to a multispecies context, provide evidence for nutrient niche partitioning among wild pollinators and highlight the need to consider species-specific nutritional requirements in pollinator conservation.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"20250643"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12380497/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144986971","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}

引用次数: 0

Keratinization-like differentiation process forms chitinous dermal sclerites in the hot-vent snail Ifremeria nautilei. 热风螺角化样分化过程形成几丁质真皮硬膜。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-27 DOI: 10.1098/rspb.2025.1220

Chong Chen, Satoshi Okada, Hiromi Kayama Watanabe, Katsuyuki Uematsu, Noriyuki Isobe

{"title":"Keratinization-like differentiation process forms chitinous dermal sclerites in the hot-vent snail Ifremeria nautilei.","authors":"Chong Chen, Satoshi Okada, Hiromi Kayama Watanabe, Katsuyuki Uematsu, Noriyuki Isobe","doi":"10.1098/rspb.2025.1220","DOIUrl":"https://doi.org/10.1098/rspb.2025.1220","url":null,"abstract":"Animals produce diverse hard structures for critical functions such as protection, feeding and detoxification. Most animals use the polysaccharide chitin as a framework for this, while vertebrates have switched to using fibrous proteins like collagen and keratin. Vertebrates make structures like skin and horns through a cellular differentiation process called keratinization where cells accumulating keratin die and compact into hard layers-drastically different from chitinous structures, which are secreted directly by living cells. Here, we report remarkable chitinous dermal sclerites that are not secreted but instead produced by a keratinization-like process, in the deep-sea hot-vent snail Ifremeria nautilei. These scales bundle to form 'warts' on the foot, the framework of which we show to be β-chitin. Microscopic observations reveal that Ifremeria scales are not formed by uniform, secreted layers but instead involve cells going through a series of unusual differentiation steps strongly resembling keratinization. The only other gastropod with chitinous dermal sclerites is the phylogenetically distant scaly-foot snail Chrysomallon squamiferum, but the scales of Chrysomallon form by secretion. Our finding of a chitinous convergence for keratinization opens a new avenue to unveil how such complex terminal cell differentiation processes evolve and may also inspire biomimetic innovation in material sciences.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"20251220"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12380485/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144986981","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}

引用次数: 0

When and how do 17-year periodical cicada nymphs decide to emerge? A field test of the 4-year-gate hypothesis. 十七年周期的蝉若虫何时以及如何决定出现？4年门假说的现场检验。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-27 DOI: 10.1098/rspb.2025.1306

Namiho Saito, Satoshi Yamamoto, Satoshi Kakishima, Yutaka Okuzaki, Andrew Rasmussen, Diler Haji, Shota Nomura, Hiroyuki Tanaka, Takehiko Itoh, Jin Yoshimura, Chris Simon, John R Cooley, Gene Kritsky, Teiji Sota

{"title":"When and how do 17-year periodical cicada nymphs decide to emerge? A field test of the 4-year-gate hypothesis.","authors":"Namiho Saito, Satoshi Yamamoto, Satoshi Kakishima, Yutaka Okuzaki, Andrew Rasmussen, Diler Haji, Shota Nomura, Hiroyuki Tanaka, Takehiko Itoh, Jin Yoshimura, Chris Simon, John R Cooley, Gene Kritsky, Teiji Sota","doi":"10.1098/rspb.2025.1306","DOIUrl":"https://doi.org/10.1098/rspb.2025.1306","url":null,"abstract":"The 17-year cicadas (Magicicada spp.) are renowned for the longest, strictly regulated juvenile period in insects, yet how they control their life cycle is unknown. Here, we test our hypothesis of adult emergence decision points at developmental gates of 4n years based on critical body weight (CBW). We studied growth and gene expression in 11-16-year-old last instar nymphs of two Magicicada species at multiple locations in autumn. The decision to emerge was reliably indicated by eye-colour change from white to red. We found that almost all 16-year-old nymphs were red-eyed (thus decided to emerge) with large body weights probably exceeding critical body weight, and a small but appreciable proportion of autumn 12-year-old nymphs having larger body weights than white-eyed nymphs similarly made the decision to emerge. However, nymphs of other ages were not red-eyed even if they had large body weights, except for very few cases. Red-eyed nymphs showed elevated expression for genes involved in response to external stimuli, especially light, and for genes facilitating adult morphological development, but genes for adult metamorphosis and moulting were expressed only after overwintering, at 17 years old. Thus, 17-year cicadas likely make the decision to emerge principally at 4-year gates, if they have achieved critical body weight as hypothesized.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"20251306"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12380492/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144987048","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}

引用次数: 0

Time to grow up: the PETM climatic event favoured metamorphosing salamanders (Urodela, Salamandridae). 成长的时间：PETM气候事件有利于变形蝾螈（蝾螈科尾螈目）。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-13 DOI: 10.1098/rspb.2025.1333

Loredana Macaluso, Andrea Villa, Roberto Rozzi, Anne-Claire Fabre, Bastien Mennecart

{"title":"Time to grow up: the PETM climatic event favoured metamorphosing salamanders (Urodela, Salamandridae).","authors":"Loredana Macaluso, Andrea Villa, Roberto Rozzi, Anne-Claire Fabre, Bastien Mennecart","doi":"10.1098/rspb.2025.1333","DOIUrl":"10.1098/rspb.2025.1333","url":null,"abstract":"Currently, little is known about the early evolution and geographical origin of Salamandridae, the most species-rich family of Palearctic salamanders. The description of new fossil material from the early Palaeogene of the Paris Basin provides new insight into the history of amphibians and for the first time allows the inclusion of the oldest salamandrid taxa into a phylogenetic framework, based on a new morphology-based character matrix. By comparing the evolutionary trajectories of the two main Nearctic groups of Cenozoic amphibians, urodeles and anurans, it emerges that whereas frogs were hardly affected by the Palaeocene-Eocene Thermal Maximum (PETM), salamanders responded in Western Europe with a diversification event, corresponding to a spread of metamorphosing, likely terrestrial, salamandrids. Among Salamandridae, the Palaeocene Koalliella genzeli is retrieved as the sister taxon of the extant, Italian endemic genus Salamandrina, clarifying the plesiomorphic nature of the features that, in morphology-based phylogeny, traditionally group Salamandrina with the newts. Two Eocene taxa herein described replaced Koalliella in the early Eocene assemblages, being respectively sister taxa of Salamandrinae, the 'true' salamanders, and Pleurodelinae, the newts. The PETM is, therefore, the main driving event leading to the first radiation of the Salamandridae, ultimately ending up being the most diverse extant clade of Palearctic salamanders. All in all, our study provides new insights into (i) the worldwide diversification of the family Salamandridae and (ii) the evolution of the whole amphibian fauna in Western Europe.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2052","pages":"20251333"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12343131/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144839881","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}

引用次数: 0

Characterizing internal models of the visual environment. 表征视觉环境的内部模型。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-20 DOI: 10.1098/rspb.2025.0602

Micha Engeser, Susan Ajith, Ilker Duymaz, Gongting Wang, Matthew J Foxwell, Radoslaw M Cichy, David Pitcher, Daniel Kaiser

{"title":"Characterizing internal models of the visual environment.","authors":"Micha Engeser, Susan Ajith, Ilker Duymaz, Gongting Wang, Matthew J Foxwell, Radoslaw M Cichy, David Pitcher, Daniel Kaiser","doi":"10.1098/rspb.2025.0602","DOIUrl":"10.1098/rspb.2025.0602","url":null,"abstract":"Despite the complexity of real-world environments, natural vision is seamlessly efficient. To explain this efficiency, researchers often use predictive processing frameworks, in which perceptual efficiency is determined by the match between the visual input and internal models of what the world should look like. In scene vision, predictions derived from our internal models of a scene should play a particularly important role, given the highly reliable statistical structure of our environment. Despite their importance for scene perception, we still do not fully understand what is contained in our internal models of the environment. Here, we highlight that the current literature disproportionately focuses on an experimental approach that tries to infer the contents of internal models from arbitrary, experimenter-driven manipulations in stimulus characteristics. To make progress, additional participant-driven approaches are needed, focusing on participants' descriptions of what constitutes a typical scene. We discuss how recent studies on memory and perception used methods like line drawings to characterize internal representations in unconstrained ways and on the level of individual participants. These emerging methods show that it is now time to also study natural scene perception from a different angle-starting with a characterization of an individual's expectations about the world.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"20250602"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12364571/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885024","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}

引用次数: 0

Causal inference, prediction and state estimation in sensorimotor learning. 感觉运动学习中的因果推理、预测和状态估计。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-13 DOI: 10.1098/rspb.2025.1320

Hyosub E Kim, Romeo Chua, Davin Hu

{"title":"Causal inference, prediction and state estimation in sensorimotor learning.","authors":"Hyosub E Kim, Romeo Chua, Davin Hu","doi":"10.1098/rspb.2025.1320","DOIUrl":"10.1098/rspb.2025.1320","url":null,"abstract":"The sensorimotor system must constantly decide which errors to learn from and which to ignore. Recent work has shown that humans are remarkably precise in parsing movement errors into internally and externally generated components for this purpose: participants automatically ignore internally generated reaching errors caused by motor noise, yet implicitly adapt to size-matched externally generated errors caused by visual perturbations. Following replication of these results with 16 neurotypical adults, we formalized our understanding of this behaviour with a novel Bayesian decision-making model. The Parsing of Internal and External Causes of Error (PIECE) model frames adaptation as a process of causal inference regarding the source of error, with the magnitude of motor corrections reflecting a combination of state estimation and the observer's degree-of-belief that their movement was externally perturbed. Thus, PIECE challenges current computational theories that posit adaptation as a process of re-aligning the perceived hand position with the movement goal. When formally compared with three representative models of this hand-to-target alignment view, we show that only PIECE can capture the precise parsing of internal versus external errors observed. Combined, this work provides a normative explanation of how the nervous system discounts intrinsic motor noise and adapts to perturbations, keeping movements finely calibrated.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2052","pages":"20251320"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12343128/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144839872","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}

引用次数: 0

Dominance rank, facial morphology and testes size in male white-faced capuchins: evidence for pre- and post-mating competition. 雄性白面卷尾猴的优势等级、面部形态和睾丸大小：交配前后竞争的证据。

IF 3.5

Proceedings. Biological sciences Pub Date : 2025-08-01 Epub Date: 2025-08-20 DOI: 10.1098/rspb.2025.0645

Nicholas Chapoy, Marcos Alvarez-Garita, Evelyn Howard, Blanca Cejalvo Insausti, Nelle K Kulick, Mercedes Marinaro, Hubert A Mendez, Suheidy Romero Morales, Megan Petersdorf, Alice C Poirier, Robinson Sandoval, Giulia Severino, Wendy Téllez Arias, Anja Widdig, Amanda Melin, Katharine Jack

{"title":"Dominance rank, facial morphology and testes size in male white-faced capuchins: evidence for pre- and post-mating competition.","authors":"Nicholas Chapoy, Marcos Alvarez-Garita, Evelyn Howard, Blanca Cejalvo Insausti, Nelle K Kulick, Mercedes Marinaro, Hubert A Mendez, Suheidy Romero Morales, Megan Petersdorf, Alice C Poirier, Robinson Sandoval, Giulia Severino, Wendy Téllez Arias, Anja Widdig, Amanda Melin, Katharine Jack","doi":"10.1098/rspb.2025.0645","DOIUrl":"10.1098/rspb.2025.0645","url":null,"abstract":"Male reproductive success is determined by the interplay of female mate choice and male-male competition, often linked to dominance rank in social animals. Across taxa, elaborate ornaments, such as bright coloration or large antlers, often function as badges of status, signalling male competitive ability to rivals. In species where females mate with multiple males, post-mating sperm competition also plays an important role in male reproductive success and is associated with larger relative testes size. We investigate the relationship between morphological features and dominance rank in wild male white-faced capuchins. Using parallel-laser photogrammetry, we measured aspects of facial morphology, including facial width-to-height ratio, and testes size. We found that alpha males had significantly larger facial width-to-height ratios, wider faces and wider scrota than subordinate males. These results suggest that facial traits potentially function as badges of status in male white-faced capuchins and may play a role in pre-mating competition and/or mate choice, while differences in scrotal size reflect adaptations for post-mating competition. This study highlights the under-recognized role of facial trait evolution in sexual selection among relatively gracile yet highly visually oriented mammals and the potential variability of sexual traits in species characterized by strong reproductive skew among males.","PeriodicalId":520757,"journal":{"name":"Proceedings. Biological sciences","volume":"292 2053","pages":"20250645"},"PeriodicalIF":3.5,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12364586/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885025","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}

引用次数: 0