当前期刊: The American Naturalist Go to current issue    加入关注   
显示样式:        排序: IF: - GO 导出
我的关注
我的收藏
您暂时未登录!
登录
  • Australian Rodents Reveal Conserved Cranial Evolutionary Allometry across 10 Million Years of Murid Evolution
    Am. Nat. (IF 3.744) Pub Date : 2020-10-16
    Ariel E. Marcy; Thomas Guillerme; Emma Sherratt; Kevin C. Rowe; Matthew J. Phillips; Vera Weisbecker

    Among vertebrates, placental mammals are particularly variable in the covariance between cranial shape and body size (allometry), with rodents being a major exception. Australian murid rodents allow an assessment of the cause of this anomaly because they radiated on an ecologically diverse continent notably lacking other terrestrial placentals. Here, we use 3D geometric morphometrics to quantify species-level

    更新日期:2020-10-17
  • Front and Back Matter
    Am. Nat. (IF 3.744) Pub Date : 2020-10-16

    The American Naturalist, Volume 196, Issue 5, November 2020.

    更新日期:2020-10-17
  • Comparing the Indirect Effects between Exploiters in Predator-Prey and Host-Pathogen Systems
    Am. Nat. (IF 3.744) Pub Date : 2020-10-09
    Michael H. Cortez; Meghan A. Duffy

    In multipredator and multipathogen systems, exploiters interact indirectly via shared victim species. Interspecific prey competition and the degree of predator specialization are known to influence whether predators have competitive (i.e., (−,−)) or noncompetitive (i.e., (−,+) or (+,+)) indirect interactions. Much less is known about the population-level indirect interactions between pathogens that

    更新日期:2020-10-11
  • Proximate Causes of Infertility and Embryo Mortality in Captive Zebra Finches
    Am. Nat. (IF 3.744) Pub Date : 2020-09-28
    Yifan Pei (裴一凡); Wolfgang Forstmeier; Daiping Wang (王代平); Katrin Martin; Joanna Rutkowska; Bart Kempenaers

    Some species show high rates of reproductive failure, which is puzzling because natural selection works against such failure in every generation. Hatching failure is common in both captive and wild zebra finches (Taeniopygia guttata), yet little is known about its proximate causes. Here we analyze data on reproductive performance (the fate of >23,000 eggs) based on up to 14 years of breeding of four

    更新日期:2020-09-29
  • Understanding the Social Dynamics of Breeding Phenology: Indirect Genetic Effects and Assortative Mating in a Long-Distance Migrant
    Am. Nat. (IF 3.744) Pub Date : 2020-09-25
    Maria Moiron; Yimen G. Araya-Ajoy; Céline Teplitsky; Sandra Bouwhuis; Anne Charmantier

    Phenological traits, such as the timing of reproduction, are often influenced by social interactions between paired individuals. Such partner effects may occur when pair members affect each other’s prebreeding environment. Partner effects can be environmentally and/or genetically determined, and quantifying direct and indirect genetic effects is important for understanding the evolutionary dynamics

    更新日期:2020-09-26
  • Front and Back Matter
    Am. Nat. (IF 3.744) Pub Date : 2020-09-24

    The American Naturalist, Volume 196, Issue 4, October 2020.

    更新日期:2020-09-25
  • Miniaturization, Genome Size, and Biological Size in a Diverse Clade of Salamanders
    Am. Nat. (IF 3.744) Pub Date : 2020-09-23
    Louis Paul Decena-Segarra; Lilijana Bizjak-Mali; Aleš Kladnik; Stanley K. Sessions; Sean M. Rovito

    Genome size (C-value) can affect organismal traits across levels of biological organization from tissue complexity to metabolism. Neotropical salamanders show wide variation in genome and body sizes, including several clades with miniature species. Because miniaturization imposes strong constraints on morphology and development and because genome size is strongly correlated with cell size, we hypothesize

    更新日期:2020-09-24
  • The Size, Symmetry, and Color Saturation of a Male Guppy’s Ornaments Forecast His Resistance to Parasites
    Am. Nat. (IF 3.744) Pub Date : 2020-09-22
    Jessica F. Stephenson; Martin Stevens; Jolyon Troscianko; Jukka Jokela

    Sexually selected ornaments range from highly dynamic traits to those that are fixed during development and relatively static throughout sexual maturity. Ornaments along this continuum differ in the information they provide about the qualities of potential mates, such as their parasite resistance. Dynamic ornaments enable real-time assessment of the bearer’s condition: they can reflect an individual’s

    更新日期:2020-09-22
  • Fledging Mass Is Color Morph Specific and Affects Local Recruitment in a Wild Bird
    Am. Nat. (IF 3.744) Pub Date : 2020-09-22
    Chiara Morosinotto; Jon E. Brommer; Atte Lindqvist; Kari Ahola; Esa Aaltonen; Teuvo Karstinen; Patrik Karell

    Early-life conditions may have long-lasting effects on life history. In color polymorphic species, morph-specific sensitivity to environmental conditions may lead to differential fitness. In tawny owls (Strix aluco), pheomelanin-based color polymorphism is expected to be maintained because the brown morph has higher adult fitness in warmer environments, while selection favors the gray morph under colder

    更新日期:2020-09-22
  • Janzen-Connell Effects Are a Weak Impediment to Competitive Exclusion
    Am. Nat. (IF 3.744) Pub Date : 2020-09-16
    Ryan A. Chisholm; Tak Fung

    A goal of ecology is to identify the stabilizing mechanisms that maintain species diversity in the face of competitive exclusion and drift. For tropical forest tree communities, it has been hypothesized that high diversity is maintained via Janzen-Connell effects, whereby host-specific natural enemies prevent any one species from becoming too abundant. Here we explore the plausibility of this hypothesis

    更新日期:2020-09-18
  • Complex Relationship between Tunneling Patterns and Individual Behaviors in Termites
    Am. Nat. (IF 3.744) Pub Date : 2020-09-16
    Nobuaki Mizumoto; Paul M. Bardunias; Stephen C. Pratt

    The nests built by social insects are complex group-level structures that emerge from interactions among individuals following simple behavioral rules. Nest patterns vary among species, and the theory of complex systems predicts that there is no simple one-to-one relationship between variation in collective patterns and variation in individual behaviors. Therefore, a species-by-species comparison of

    更新日期:2020-09-18
  • Ant Collective Behavior Is Heritable and Shaped by Selection
    Am. Nat. (IF 3.744) Pub Date : 2020-09-14
    Justin T. Walsh; Simon Garnier; Timothy A. Linksvayer

    Collective behaviors are widespread in nature and usually assumed to be strongly shaped by natural selection. However, the degree to which variation in collective behavior is heritable and has fitness consequences—the two prerequisites for evolution by natural selection—is largely unknown. We used a new pharaoh ant (Monomorium pharaonis) mapping population to estimate the heritability, genetic correlations

    更新日期:2020-09-15
  • Spite and the Geometry of Negative Relatedness
    Am. Nat. (IF 3.744) Pub Date : 2020-09-15
    Philip G. Madgwick

    Spite is the most surprising prediction of inclusive fitness theory because it suggests that a gene can be favored by natural selection despite causing harm to both the individuals that carry it and those around them. A gene for spite can only be favored because of negative relatedness, which means that the actor that carries the gene is less likely to share the gene for spite with the surrounding

    更新日期:2020-09-15
  • Evolution of Plasticity in Response to Ethanol between Sister Species with Different Ecological Histories (Drosophila melanogaster and D. simulans)
    Am. Nat. (IF 3.744) Pub Date : 2020-09-15
    Sarah A. Signor

    When populations evolve adaptive reaction norms in response to novel environments, it can occur through a process termed genetic accommodation. Under this model, the initial response to the environment is widely variable between genotypes as a result of cryptic genetic variation, which is then refined by selection to a single adaptive response. Here, I empirically test these predictions from genetic

    更新日期:2020-09-15
  • The Complexity of Social Complexity: A Quantitative Multidimensional Approach for Studies of Social Organization
    Am. Nat. (IF 3.744) Pub Date : 2020-09-11
    Jacob G. Holland; Guy Bloch

    The rapid increase in “big data” during the postgenomic era makes it crucial to appropriately measure the level of social complexity in comparative studies. We argue that commonly used qualitative classifications lump together species showing a broad range of social complexity and falsely imply that social evolution always progresses along a single linear stepwise trajectory that can be deduced from

    更新日期:2020-09-12
  • State-Dependent Decision-Making by Predators and Its Consequences for Mimicry
    Am. Nat. (IF 3.744) Pub Date : 2020-09-11
    Thomas G. Aubier; Thomas N. Sherratt

    The mimicry of one species by another provides one of the most celebrated examples of evolution by natural selection. Edible Batesian mimics deceive predators into believing they may be defended, whereas defended Müllerian mimics have evolved a shared warning signal, more rapidly educating predators to avoid them. However, it may benefit hungry predators to attack defended prey, while the benefits

    更新日期:2020-09-12
  • Predicting Multivariate Responses of Sexual Dimorphism to Direct and Indirect Selection
    Am. Nat. (IF 3.744) Pub Date : 2020-09-10
    Changde Cheng (成常德); David Houle

    Sexual dimorphism is often assumed to result from balancing the strength of antagonistic selection in favor of dimorphism against the degree of constraint imposed by the shared genome of the sexes, reflected in the B matrix of genetic intersexual covariances. To investigate the totality of forces shaping dimorphism, we reparameterized the Lande equation to predict changes in trait averages and trait

    更新日期:2020-09-11
  • Multiple Environmental Stressors Induce an Adaptive Maternal Effect
    Am. Nat. (IF 3.744) Pub Date : 2020-09-10
    Ahva L. Potticary; Renée A. Duckworth

    Evolution of adaptation requires predictability and recurrence of functional contexts. Yet organisms live in multifaceted environments that are dynamic and ever changing, making it difficult to understand how complex adaptations evolve. This problem is particularly apparent in the evolution of adaptive maternal effects, which are often assumed to require reliable and discrete cues that predict conditions

    更新日期:2020-09-11
  • Combinatorial Signal Processing in an Insect
    Am. Nat. (IF 3.744) Pub Date : 2020-09-08
    Bretta Speck; Sara Seidita; Samuel Belo; Samuel Johnson; Caley Conley; Camille Desjonquères; Rafael L. Rodríguez

    Human language is combinatorial: phonemes are grouped into syllables, syllables are grouped into words, and so on. The capacity for combinatorial processing is present, in different degrees, in some mammals and birds. We used vibrational insects, Enchenopa treehoppers, to test the hypothesis of basic combinatorial processing against two competing hypotheses: beginning rule (where the early signal portions

    更新日期:2020-09-08
  • Propensity for Risk in Reproductive Strategy Affects Susceptibility to Anthropogenic Disturbance
    Am. Nat. (IF 3.744) Pub Date : 2020-08-31
    Enrico Pirotta; Vincent Hin; Marc Mangel; Leslie New; Daniel P. Costa; André M. de Roos; John Harwood

    Animals initiate, interrupt, or invest resources in reproduction in light of their physiology and the environment. The energetic risks entailed in an individual’s reproductive strategy can influence the ability to cope with additional stressors, such as anthropogenic climate change and disturbance. To explore the trade-offs between internal state, external resource availability, and reproduction, we

    更新日期:2020-09-01
  • Timing Metabolic Depression: Predicting Thermal Stress in Extreme Intertidal Environments
    Am. Nat. (IF 3.744) Pub Date : 2020-08-25
    Tin Yan Hui; Yun-wei Dong; Guo-dong Han; Sarah L. Y. Lau; Martin C. F. Cheng; Chayanid Meepoka; Monthon Ganmanee; Gray A. Williams

    Anticipatory changes in organismal responses, triggered by reliable environmental cues for future conditions, are key to species’ persistence in temporally variable environments. Such responses were tested by measuring the physiological performance of a tropical high-shore oyster in tandem with the temporal predictability of environmental temperature. Heart rate of the oyster increased with environmental

    更新日期:2020-08-26
  • Resistance Genes Affect How Pathogens Maintain Plant Abundance and Diversity
    Am. Nat. (IF 3.744) Pub Date : 2020-08-25
    Simon Maccracken Stump; James H. Marden; Noelle G. Beckman; Scott A. Mangan; Liza S. Comita

    Specialized pathogens are thought to maintain plant community diversity; however, most ecological studies treat pathogens as a black box. Here we develop a theoretical model to test how the impact of specialized pathogens changes when plant resistance genes (R-genes) mediate susceptibility. This work synthesizes two major hypotheses: the gene-for-gene model of pathogen resistance and the Janzen-Connell

    更新日期:2020-08-25
  • Host Plant Choice Determined by Reproductive Interference between Closely Related Butterflies
    Am. Nat. (IF 3.744) Pub Date : 2020-08-25
    Naota Ohsaki; Masaaki Ohata; Yoshibumi Sato; Mark D. Rausher

    A number of empirical studies have concluded that reproductive interference (RI) contributes to parapatric species distributions or sexual exclusion. However, the possibility that divergent host plant use in phytophagous insects is due to sexual exclusion has seldom been considered. Here, we present evidence that RI is responsible for different host plant use by two Pierid butterfly species, Pieris

    更新日期:2020-08-25
  • Front and Back Matter
    Am. Nat. (IF 3.744) Pub Date : 2020-08-19

    The American Naturalist, Volume 196, Issue 3, September 2020.

    更新日期:2020-08-20
  • Detecting the Signature of Body Mass Evolution in the Broad-Scale Architecture of Food Webs
    Am. Nat. (IF 3.744) Pub Date : 2020-08-18
    John P. DeLong

    Body mass–based links between predator and prey are fundamental to the architecture of food webs. These links determine who eats whom across trophic levels and strongly influence the population abundance, flow of energy, and stability properties of natural communities. Body mass links scale up to create predator-prey mass relationships across species, but the origin of these relationships is unclear

    更新日期:2020-08-19
  • A Comparative Test for Divergent Adaptation: Inferring Speciation Drivers from Functional Trait Divergence
    Am. Nat. (IF 3.744) Pub Date : 2020-08-18
    Sean A. S. Anderson; Jason T. Weir

    Ecological differentiation between lineages is widely considered to be an important driver of speciation, but support for this hypothesis is mainly derived from the detailed study of a select set of model species pairs. Mounting evidence from nonmodel taxa, meanwhile, suggests that speciation often occurs with minimal differentiation in ecology or ecomorphology, calling into question the true contribution

    更新日期:2020-08-19
  • High Preservation Potential of Paleogeographic Range Size Distributions in Deep Time
    Am. Nat. (IF 3.744) Pub Date : 2020-08-18
    Simon A. F. Darroch; Michelle M. Casey; Gwen S. Antell; Amy Sweeney; Erin E. Saupe

    Reconstructing geographic range sizes from fossil data is a crucial tool in paleoecology, elucidating macroecological and macroevolutionary processes. Studies examining links between range size and extinction risk may also offer a predictive tool for identifying species most vulnerable in the “sixth mass extinction.” However, the extent to which paleogeographic ranges can be recorded reliably in the

    更新日期:2020-08-19
  • Experimental Amelioration of Harsh Weather Speeds Growth and Development in a Tropical Montane Songbird
    Am. Nat. (IF 3.744) Pub Date : 2020-08-18
    Adam E. Mitchell; Jordan Boersma; Anthonio Anthony; Kanehiro Kitayama; Thomas E. Martin

    Organisms living at high elevations generally grow and develop more slowly than those at lower elevations. Slow montane ontogeny is thought to be an evolved adaptation to harsh environments that improves juvenile quality via physiological trade-offs. However, slower montane ontogeny may also reflect proximate influences of harsh weather on parental care and offspring development. We experimentally

    更新日期:2020-08-19
  • Mating Preference for Novel Phenotypes Can Be Explained by General Neophilia in Female Guppies
    Am. Nat. (IF 3.744) Pub Date : 2020-08-19
    Mitchel J. Daniel; Laura Koffinas; Kimberly A. Hughes

    Understanding how genetic variation is maintained in ecologically important traits is a fundamental question in evolutionary biology. Male Trinidadian guppies (Poecilia reticulata) exhibit extreme genetic diversity in color patterns within populations, which is believed to be promoted by a female mating preference for rare or novel patterns. However, the origins of this preference remain unclear. Here

    更新日期:2020-08-19
  • Evolution of Reproduction Periods in Seasonal Environments
    Am. Nat. (IF 3.744) Pub Date : 2020-08-11
    Zepeng Sun; Kalle Parvinen; Mikko Heino; Johan A. J. Metz; André M. de Roos; Ulf Dieckmann

    Many species are subject to seasonal cycles in resource availability, affecting the timing of their reproduction. Using a stage-structured consumer-resource model in which juvenile development and maturation are resource dependent, we study how a species’ reproductive schedule evolves, dependent on the seasonality of its resource. We find three qualitatively different reproduction modes. First, continuous

    更新日期:2020-08-11
  • Consumer Responses to Experimental Pulsed Subsidies in Isolated versus Connected Habitats.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-23
    Amber N Wright,Louie H Yang,Jonah Piovia-Scott,David A Spiller,Thomas W Schoener

    Increases in consumer abundance following a resource pulse can be driven by diet shifts, aggregation, and reproductive responses, with combined responses expected to result in faster response times and larger numerical increases. Previous work in plots on large Bahamian islands has shown that lizards (Anolis sagrei) increased in abundance following pulses of seaweed deposition, which provide additional

    更新日期:2020-07-24
  • Partner Fidelity and Asymmetric Specialization in Ecological Networks.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-23
    Miguel A Fortuna,Arxhina Nagavci,Matthew A Barbour,Jordi Bascompte

    Species are embedded in complex networks of interdependencies that may change across geographic locations. Yet most approaches to investigate the architecture of this entangled web of life have considered exclusively local communities. To quantify to what extent species interactions change at a biogeographic scale, we need to shed light on how among-community variation affects the occurrence of species

    更新日期:2020-07-24
  • The Origin and Spread of Locally Adaptive Seasonal Camouflage in Snowshoe Hares.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-20
    Matthew R Jones,L Scott Mills,Jeffrey D Jensen,Jeffrey M Good

    Adaptation is central to population persistence in the face of environmental change, yet we seldom precisely understand the origin and spread of adaptive variation in natural populations. Snowshoe hares (Lepus americanus) along the Pacific Northwest coast have evolved brown winter camouflage through positive selection on recessive variation at the Agouti pigmentation gene introgressed from black-tailed

    更新日期:2020-07-21
  • Phenotypic Plasticity for Desiccation Resistance, Climate Change, and Future Species Distributions: Will Plasticity Have Much Impact?
    Am. Nat. (IF 3.744) Pub Date : 2020-07-20
    Vanessa Kellermann,Shane F McEvey,Carla M Sgrò,Ary A Hoffmann

    While species distribution models (SDMs) are widely used to predict the vulnerability of species to climate change, they do not explicitly indicate the extent to which plastic responses ameliorate climate change impacts. Here we use data on plastic responses of 32 species of Drosophila to desiccation stress to suggest that basal resistance, rather than adult hardening, is relatively more important

    更新日期:2020-07-21
  • Male-Male Competition Causes Parasite-Mediated Sexual Selection for Local Adaptation.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-07
    Miguel Gómez-Llano,Aaditya Narasimhan,Erik I Svensson

    Sexual selection has been suggested to accelerate local adaptation and promote evolutionary rescue through several ecological and genetic mechanisms. Condition-dependent sexual selection has mainly been studied in laboratory settings, while data from natural populations are lacking. One ecological factor that can cause condition-dependent sexual selection is parasitism. Here, we quantified ectoparasite

    更新日期:2020-07-20
  • Deconstructing the Impact of Malaria Vector Diversity on Disease Risk.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-07
    Amber Gigi Hoi,Benjamin Gilbert,Nicole Mideo

    Recent years have seen significant progress in understanding the impact of host community assemblage on disease risk, yet diversity in disease vectors has rarely been investigated. Using published malaria and mosquito surveys from Kenya, we analyzed the relationship between malaria prevalence and multiple axes of mosquito diversity: abundance, species richness, and composition. We found a net amplification

    更新日期:2020-07-20
  • Mammal Community Structure through the Paleocene-Eocene Thermal Maximum.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-07
    Danielle Fraser,S Kathleen Lyons

    Human-mediated species invasion and climate change are leading to global extinctions and are predicted to result in the loss of important axes of phylogenetic and functional diversity. However, the long-term robustness of modern communities to invasion is unknown, given the limited timescales over which they can be studied. Using the fossil record of the Paleocene-Eocene thermal maximum (PETM; ∼56

    更新日期:2020-07-20
  • Defensive Symbiosis and the Evolution of Virulence.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-10
    Paul Nelson,Georgiana May

    A microbiome rife with enemies of the host should cause selection for defensive traits in symbionts, yet such complex environments are also predicted to select for greater symbiont virulence. Why then do we so often observe defensive mutualists that protect hosts while causing little to no damage? To address this question, we build a symbiont-centered model that incorporates the evolution of two independent

    更新日期:2020-07-20
  • The Minimum Environmental Perturbation Principle: A New Perspective on Niche Theory.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-13
    Robert Marsland,Wenping Cui,Pankaj Mehta

    Fifty years ago, Robert MacArthur showed that stable equilibria optimize quadratic functions of the population sizes in several important ecological models. Here, we generalize this finding to a broader class of systems within the framework of contemporary niche theory and precisely state the conditions under which an optimization principle (not necessarily quadratic) can be obtained. We show that

    更新日期:2020-07-20
  • Shifts in Reproductive Investment in Response to Competitors Lower Male Reproductive Success.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-13
    Foteini Spagopoulou,Regina Vega-Trejo,Megan L Head,Michael D Jennions

    In many species, males exhibit phenotypic plasticity in sexually selected traits when exposed to social cues about the intensity of sexual competition. To date, however, few studies have tested how this plasticity affects male reproductive success. We initially tested whether male mosquitofish, Gambusia holbrooki (Poeciliidae), change their investment in traits under pre- and postcopulatory sexual

    更新日期:2020-07-20
  • Elder Barn Owl Nestlings Flexibly Redistribute Parental Food according to Siblings' Need or in Return for Allopreening.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-10
    Pauline Ducouret,Andrea Romano,Amélie N Dreiss,Patrick Marmaroli,Xavier Falourd,Manon Bincteux,Alexandre Roulin

    Kin selection and reciprocation of biological services are distinct theories invoked to explain the origin and evolutionary maintenance of altruistic and cooperative behaviors. Although these behaviors are not considered to be mutually exclusive, the cost-benefit balance of behaving altruistically or cooperating reciprocally and the conditions promoting a switch between such different strategies have

    更新日期:2020-07-20
  • Caching in or Falling Back at the Sevilleta: The Effects of Body Size and Seasonal Uncertainty on Desert Rodent Foraging.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-15
    Justin D Yeakel,Uttam Bhat,Seth D Newsome

    Foraging in uncertain environments requires balancing the risks associated with finding alternative resources against potential gains. In arid-land environments characterized by extreme variation in the amount and seasonal timing of primary production, consumers must weigh the risks associated with foraging for preferred seeds that can be cached against fallback foods of low nutritional quality (e

    更新日期:2020-07-20
  • A Stochastic Model for Predicting Age and Mass at Maturity of Insects.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-15
    Geoffrey Legault,Joel G Kingsolver

    Variation in age and mass at maturity is commonly observed in populations, even among individuals with the same genetic and environmental backgrounds. Accounting for such individual variation with a stochastic model is important for estimating optimal evolutionary strategies and for understanding potential trade-offs among life-history traits. However, most studies employ stochastic models that are

    更新日期:2020-07-20
  • Transformational Mimicry in a Myrmecomorphic Spider.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-05
    Stano Pekár,Yun-Yun Tsai,Radek Michalko

    Species that are Batesian mimics during postembryonic development shift between mimetic models as they grow in size. However, it has not yet been tested whether these successive mimetic phenotypes are similarly protected from predators. Early-instar phenotypes could represent an inaccurate phenotype or an accurate phenotype because of selection from different predators. Here, we tested the hypotheses

    更新日期:2020-07-20
  • Selection and Constraints in the Ecomorphological Adaptive Evolution of the Skull of Living Canidae (Carnivora, Mammalia).
    Am. Nat. (IF 3.744) Pub Date : 2020-06-22
    Fabio Andrade Machado

    The association between phenotype and ecology is essential for understanding the environmental drivers of morphological evolution. This is a particularly challenging task when dealing with complex traits, such as the skull, where multiple selective pressures are at play and evolution might be constrained by ontogenetic and genetic factors. I integrate morphometric tools, comparative methods, and quantitative

    更新日期:2020-07-20
  • Common Field Data Limitations Can Substantially Bias Sexual Selection Metrics.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-16
    Emily R A Cramer,Sara A Kaiser,Michael S Webster,T Brandt Ryder

    Sexual selection studies widely estimate several metrics, but values may be inaccurate because standard field methods for studying wild populations produce limited data (e.g., incomplete sampling, inability to observe copulations directly). We compared four selection metrics (Bateman gradient, opportunity for sexual selection, opportunity for selection, and smax′) estimated with simulated complete

    更新日期:2020-07-20
  • Relative Brain Size Is Predicted by the Intensity of Intrasexual Competition in Frogs.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-22
    Chun Lan Mai 麦春兰,Wen Bo Liao 廖文波,Stefan Lüpold,Alexander Kotrschal

    Competition over mates is a powerful force shaping trait evolution. For instance, better cognitive abilities may be beneficial in male-male competition and thus be selected for by intrasexual selection. Alternatively, investment in physical attributes favoring male performance in competition for mates may lower the resources available for brain development, and more intense male mate competition would

    更新日期:2020-07-20
  • Quantifying the Contribution of Habitats and Pathways to a Spatially Structured Population Facing Environmental Change.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-11
    Christine Sample,Joanna A Bieri,Benjamin Allen,Yulia Dementieva,Alyssa Carson,Connor Higgins,Sadie Piatt,Shirley Qiu,Summer Stafford,Brady J Mattsson,Darius J Semmens,Jay E Diffendorfer,Wayne E Thogmartin

    The consequences of environmental disturbance and management are difficult to quantify for spatially structured populations because changes in one location carry through to other areas as a result of species movement. We develop a metric, G, for measuring the contribution of a habitat or pathway to network-wide population growth rate in the face of environmental change. This metric is different from

    更新日期:2020-07-20
  • Incorporating the Connectivity Timescale in Metapopulation Partitioning.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-06
    Christopher M Aiken,Sergio A Navarrete

    The often complex spatial patterns of propagule dispersal across a metapopulation present a challenge for species management, motivating efforts to represent the connectivity in simpler but meaningful ways. The reduction of complexity may be achieved by partitioning the metapopulation into groups of highly connected patches called “subpopulations.” To have relevance for management, these subunits must

    更新日期:2020-07-20
  • Metabolic Rate Interacts with Resource Availability to Determine Individual Variation in Microhabitat Use in the Wild.
    Am. Nat. (IF 3.744) Pub Date : 2020-07-06
    Sonya K Auer,Ronald D Bassar,Daniel Turek,Graeme J Anderson,Simon McKelvey,John D Armstrong,Keith H Nislow,Helen K Downie,Thomas A J Morgan,Darryl McLennan,Neil B Metcalfe

    Ecological pressures such as competition can lead individuals within a population to partition resources or habitats, but the underlying intrinsic mechanisms that determine an individual’s resource use are not well understood. Here we show that an individual’s own energy demand and associated competitive ability influence its resource use, but only when food is more limiting. We tested whether intraspecific

    更新日期:2020-07-20
  • Parasitism Risk and Infection Alter Host Dispersal.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-10
    Celina B Baines,Salma Diab,Shannon J McCauley

    Dispersal determines the spatial dynamics of host-parasite assemblages, particularly during invasions and disease epidemics. The risk of parasitism may create an incentive for dispersal, but infection is expected to reduce dispersal ability, which may alter the host’s dispersal response to biotic stressors, including population density. We measured the dispersal of a semiaquatic insect (Notonecta undulata)

    更新日期:2020-07-20
  • What Do Ecology, Evolution, and Behavior Have in Common? The Organism in the Middle.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-24
    Ellen D Ketterson

    Biologists who publish in The American Naturalist are drawn to its unifying mission of covering research in the fields of ecology, evolution, behavior, and integrative biology. Presented here is one scientist’s attempt to straddle these fields by focusing on a single organism. It is also an account of how time spent in the field stimulates a naturalist to wonder “why did that animal just do that?”

    更新日期:2020-07-20
  • Effect of Stressors on the Carrying Capacity of Spatially Distributed Metapopulations.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-10
    Bo Zhang,Donald L DeAngelis,Wei-Ming Ni,Yuanshi Wang,Lu Zhai,Alex Kula,Shuang Xu,J David Van Dyken

    Stressors such as antibiotics, herbicides, and pollutants are becoming increasingly common in the environment. The effects of stressors on populations are typically studied in homogeneous, nonspatial settings. However, most populations in nature are spatially distributed over environmentally heterogeneous landscapes with spatially restricted dispersal. Little is known about the effects of stressors

    更新日期:2020-07-20
  • Investigating the Dynamics of Elk Population Size and Body Mass in a Seasonal Environment Using a Mechanistic Integral Projection Model.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-22
    Shelly Lachish,Ellen E Brandell,Meggan E Craft,Andrew P Dobson,Peter J Hudson,Daniel R MacNulty,Tim Coulson

    Environmentally mediated changes in body size often underlie population responses to environmental change, yet this is not a universal phenomenon. Understanding when phenotypic change underlies population responses to environmental change is important for obtaining insights and robust predictions of population dynamics in a changing world. We develop a dynamic integral projection model that mechanistically

    更新日期:2020-07-20
  • Front and Back Matter
    Am. Nat. (IF 3.744) Pub Date : 2020-07-16

    The American Naturalist, Volume 196, Issue 2, August 2020.

    更新日期:2020-07-20
  • Floral Trait Evolution of Angiosperms on Pacific Islands.
    Am. Nat. (IF 3.744) Pub Date : 2020-06-01
    Molly C Hetherington-Rauth,Marc T J Johnson

    Animals frequently evolve unique suites of traits on islands, but whether plants evolve comparable island syndromes remains unresolved. Here, we test the prediction on the basis of natural history observations that insect-pollinated plants evolve smaller flowers on islands than on mainland communities. We examined 556 plant species representing 136 phylogenetically independent contrasts between island

    更新日期:2020-06-01
  • Looking for Mimicry in a Snake Assemblage Using Deep Learning.
    Am. Nat. (IF 3.744) Pub Date : 2020-05-27
    Thomas de Solan,Julien Pierre Renoult,Philippe Geniez,Patrice David,Pierre-André Crochet

    Batesian mimicry is a canonical example of evolution by natural selection, popularized by highly colorful species resembling unrelated models with astonishing precision. However, Batesian mimicry could also occur in inconspicuous species and rely on subtle resemblance. Although potentially widespread, such instances have been rarely investigated, such that the real frequency of Batesian mimicry has

    更新日期:2020-05-27
  • Climate Change and Thermoregulatory Consequences of Activity Time in Mammals.
    Am. Nat. (IF 3.744) Pub Date : 2020-05-27
    Timothy C Bonebrake,Enrico L Rezende,Francisco Bozinovic

    Activity times structure the thermal environments experienced by organisms. In mammals, species shift from being nocturnal to diurnal and vice versa, but the thermal consequences of variable activity patterns remain largely unexplored. Here we used theoretical thermoregulatory polygons bounded by estimates of basal metabolic rates (BMR), maximum metabolic rates (MMR), and thermal conductance (C) in

    更新日期:2020-05-27
  • Dispersal Predicts Hybrid Zone Widths across Animal Diversity: Implications for Species Borders under Incomplete Reproductive Isolation.
    Am. Nat. (IF 3.744) Pub Date : 2020-05-22
    Jay P McEntee,J Gordon Burleigh,Sonal Singhal

    Hybrid zones occur as range boundaries for many animal taxa. One model for how hybrid zones form and stabilize is the tension zone model, a version of which predicts that hybrid zone widths are determined by a balance between random dispersal into hybrid zones and selection against hybrids. Here, we examine whether random dispersal and proxies for selection against hybrids (genetic distances between

    更新日期:2020-05-22
  • Correction.
    Am. Nat. (IF 3.744) Pub Date : 2020-05-22
    Charles Mullon,Laurent Keller,Laurent Lehmann

    更新日期:2020-05-22
Contents have been reproduced by permission of the publishers.
导出
全部期刊列表>>
Springer 纳米技术权威期刊征稿
全球视野覆盖
施普林格·自然新
chemistry
3分钟学术视频演讲大赛
物理学研究前沿热点精选期刊推荐
自然职位线上招聘会
欢迎报名注册2020量子在线大会
化学领域亟待解决的问题
材料学研究精选新
GIANT
ACS ES&T Engineering
ACS ES&T Water
屿渡论文,编辑服务
ACS Publications填问卷
阿拉丁试剂right
麻省大学
西北大学
湖南大学
华东师范大学
王要兵
<