Showing papers in "The American Naturalist in 2023"
TL;DR: In this paper , a case study in African wild dogs is presented, showing that higher mortality is not a universal cost of dispersal, but rather a special case of higher mortality in wild dogs.
Abstract: Previous articleNext article No AccessHigher mortality is not a universal cost of dispersal: A case study in African wild dogsDominik Behr, Florian H Hodel, Gabriele Cozzi, John W McNutt, and Arpat OzgulDominik Behr Search for more articles by this author , Florian H Hodel Search for more articles by this author , Gabriele Cozzi Search for more articles by this author , John W McNutt Search for more articles by this author , and Arpat Ozgul Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/726220 © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
2 citations
TL;DR: In this paper , the authors devise a theoretical framework that combines these facets and apply it to the above questions of how trait variation is apportioned within and between species in unstructured and structured populations using two simple models of Lotka-Volterra competition.
Abstract: How is trait diversity in a community apportioned between and within coevolving species? Disruptive selection may result in either a few species with large intraspecific trait variation (ITV) or many species with different mean traits but little ITV. Similar questions arise in spatially structured communities: heterogeneous environments could result in either a few species that exhibit local adaptation or many species with different mean traits but little local adaptation. To date, theory has been well-equipped to either include ITV or to dynamically determine the number of coexisting species, but not both. Here, we devise a theoretical framework that combines these facets and apply it to the above questions of how trait variation is apportioned within and between species in unstructured and structured populations, using two simple models of Lotka-Volterra competition. For unstructured communities, we find that as the breadth of the resource spectrum increases, ITV goes from being unimportant to crucial for characterizing the community. For spatially structured communities on two patches, we find no local adaptation, symmetric local adaptation, or asymmetric local adaptation, depending on how much the patches differ. Our framework provides a general approach to incorporate ITV in models of eco-evolutionary community assembly.
2 citations
TL;DR: This article investigated the evolutionary determinants of non-seasonal breeding in a wild primate, the chacma baboon (Papio ursinus), living in a seasonal environment with high climatic unpredictability.
Abstract: Animal reproductive phenology varies from strongly seasonal to nonseasonal, sometimes among closely related or sympatric species. While the extent of reproductive seasonality is often attributed to environmental seasonality, this fails to explain many cases of nonseasonal breeding in seasonal environments. We investigated the evolutionary determinants of nonseasonal breeding in a wild primate, the chacma baboon (Papio ursinus), living in a seasonal environment with high climatic unpredictability. We tested three hypotheses proposing that nonseasonal breeding has evolved in response to (1) climatic unpredictability, (2) reproductive competition between females favoring birth asynchrony, and (3) individual, rank-dependent variations in optimal reproductive timing. We found strong support for an effect of reproductive asynchrony modulated by rank: (i) birth synchrony is costly to subordinate females, lengthening their interbirth intervals; (ii) females alter their reproductive timings (fertility periods and conceptions) in relation to previous conceptions in the group; and (iii) the reported effect of birth synchrony on interbirth intervals weakens the intensity of reproductive seasonality at the population level. This study emphasizes the importance of sociality in mediating the evolution of reproductive phenology in group-living organisms, a result of broad significance for understanding key demographic parameters driving population responses to increasing climatic fluctuations.
2 citations
TL;DR: Abram et al. as discussed by the authors investigated the determinants of clutch size variation in pentatomid bugs and found that protective geometry and reproductive anatomy are candidate determinants for clutch size variations.
Abstract: Previous articleNext article No AccessProtective geometry and reproductive anatomy as candidate determinants of clutch size variation in pentatomid bugsPaul K. Abram, Eric Guerra-Grenier, Jacques Brodeur, Clarissa Capko, Michely Ferreira Santos Aquino, Elizabeth H. Beers, Maria Carolina Blassioli-Moraes, Miguel Borges, M. Fernanda Cingolani, Antonino Cusumano, Patrick De Clercq, Celina A. Fernandez, Tara D. Gariepy, Tim Haye, Kim Hoelmer, Raul Alberto Laumann, Marcela Lietti, J.E. McPherson, Eduardo Punscke, Thomas E. Saunders, Jin Ping Zhang, and Ian C.W. HardyPaul K. Abram Search for more articles by this author , Eric Guerra-Grenier Search for more articles by this author , Jacques Brodeur Search for more articles by this author , Clarissa Capko Search for more articles by this author , Michely Ferreira Santos Aquino Search for more articles by this author , Elizabeth H. Beers Search for more articles by this author , Maria Carolina Blassioli-Moraes Search for more articles by this author , Miguel Borges Search for more articles by this author , M. Fernanda Cingolani Search for more articles by this author , Antonino Cusumano Search for more articles by this author , Patrick De Clercq Search for more articles by this author , Celina A. Fernandez Search for more articles by this author , Tara D. Gariepy Search for more articles by this author , Tim Haye Search for more articles by this author , Kim Hoelmer Search for more articles by this author , Raul Alberto Laumann Search for more articles by this author , Marcela Lietti Search for more articles by this author , J.E. McPherson Search for more articles by this author , Eduardo Punscke Search for more articles by this author , Thomas E. Saunders Search for more articles by this author , Jin Ping Zhang Search for more articles by this author , and Ian C.W. Hardy Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725917 Views: 23Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
2 citations
TL;DR: In this paper , the authors show that within-individual and between-year individual variation in within-year phenotypic variation is structured and directional, consistent with the threshold trait model.
Abstract: AbstractPopulation responses to environmental variation ultimately depend on within-individual and among-individual variation in labile phenotypic traits that affect fitness and resulting episodes of selection. Yet complex patterns of individual phenotypic variation arising within and between time periods, as well as associated variation in selection, have not been fully conceptualized or quantified. We highlight how structured patterns of phenotypic variation in dichotomous threshold traits can theoretically arise and experience varying forms of selection, shaping overall phenotypic dynamics. We then fit novel multistate models to 10 years of band-resighting data from European shags to quantify phenotypic variation and selection in a key threshold trait underlying spatioseasonal population dynamics: seasonal migration versus residence. First, we demonstrate substantial among-individual variation alongside substantial between-year individual repeatability in within-year phenotypic variation ("flexibility"), with weak sexual dimorphism. Second, we demonstrate that between-year individual variation in within-year phenotypes ("supraflexibility") is structured and directional, consistent with the threshold trait model. Third, we demonstrate strong survival selection on within-year phenotypes-and hence on flexibility-that varies across years and sexes, including episodes of disruptive selection representing costs of flexibility. By quantitatively combining these results, we show how supraflexibility and survival selection on migratory flexibility jointly shape population-wide phenotypic dynamics of seasonal movement.
2 citations
TL;DR: In this paper , the authors used experimental evolution to test whether plasticity and phenotypic evolution follow gmax during adaptation to environments that varied in environmental heterogeneity and found that plasticity across assay temperatures was in a different direction to phenotype and aligned better with maternal variance than gmax.
Abstract: Genetic correlations concentrate genetic variation in certain directions of the multivariate phenotype. Adaptation and, under some models, plasticity is expected to occur in the direction of the phenotype containing the greatest amount of genetic variation (gmax). However, this may hinge on environmental heterogeneity, which can affect patterns of genetic variation. I use experimental evolution to test whether plasticity and phenotypic evolution follow gmax during adaptation to environments that varied in environmental heterogeneity. For >25 generations, Drosophila melanogaster populations were exposed to six homogeneous or spatially and temporally heterogeneous treatments involving hot (25°C) and cold (16°C) temperatures. Five wing traits were assayed in both temperatures. Wing morphology diverged between populations evolving in homogeneous hot and cold temperatures in a direction of the phenotype containing a large proportion of genetic variance and that aligned closely with gmax at 16°C but not at 25°C. Spatial heterogeneity produced an intermediate phenotype, which was associated with similar genetic variance across assay temperatures compared with all other treatments. Surprisingly, plasticity across assay temperatures was in a different direction to phenotypic evolution and aligned better with maternal variance than gmax. Together, these results provide experimental evidence for evolution along genetic lines of least resistance in homogeneous environments but no support for predicting plastic responses from the orientation of genetic variation. These results also suggest that spatial heterogeneity could maintain genetic variation that increases the stability of genetic variance across environments.
2 citations
TL;DR: Dellinger et al. as mentioned in this paper studied the effect of altitude-driven pollinator turnover in tropical and temperate Americas and found that altitude was a major factor in the change of pollinator numbers.
Abstract: Previous articleNext article No AccessOpposing patterns of altitude-driven pollinator turnover in the tropical and temperate AmericasAgnes Sophie Dellinger, Ashley M. Hamilton, Carolyn A. Wessinger, and Stacey D. SmithAgnes Sophie Dellinger Search for more articles by this author , Ashley M. Hamilton Search for more articles by this author , Carolyn A. Wessinger Search for more articles by this author , and Stacey D. Smith Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725017 Views: 2Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
2 citations
TL;DR: In this article , the authors examined how assortative mating affects the evolution of plasticity in sessile oaks and found significant genetic divergence for the intercept, but not for the slope, of reaction norms to temperature.
Abstract: AbstractPrevious theory has shown that assortative mating for plastic traits can maintain genetic divergence across environmental gradients despite high gene flow. Yet these models did not examine how assortative mating affects the evolution of plasticity. We here describe patterns of genetic variation across elevation for plasticity in a trait under assortative mating, using multiple-year observations of budburst date in a common garden of sessile oaks. Despite high gene flow, we found significant spatial genetic divergence for the intercept, but not for the slope, of reaction norms to temperature. We then used individual-based simulations, where both the slope and the intercept of the reaction norm evolve, to examine how assortative mating affects the evolution of plasticity, varying the intensity and distance of gene flow. Our model predicts the evolution of either suboptimal plasticity (reaction norms with a slope shallower than optimal) or hyperplasticity (slopes steeper than optimal) in the presence of assortative mating when optimal plasticity would evolve under random mating. Furthermore, a cogradient pattern of genetic divergence for the intercept of the reaction norm (where plastic and genetic effects are in the same direction) always evolves in simulations with assortative mating, consistent with our observations in the studied oak populations.
1 citations
TL;DR: In this article , the authors examined geographic variation in dorsal patterning, coloration, and solar reflectance among horned larks (Eremophila alpestris) of the western United States.
Abstract: AbstractAnimal coloration serves many biological functions and must therefore balance potentially competing selective pressures. For example, many animals have camouflage in which coloration matches the visual background that predators scan for prey. However, different colors reflect different amounts of solar radiation and may therefore have thermoregulatory implications as well. In this study, we examined geographic variation in dorsal patterning, coloration, and solar reflectance among horned larks (Eremophila alpestris) of the western United States. We found that plumage brightness was positively associated with soil granularity, aridity, and temperature. Plumage redness-both in terms of saturation (i.e., chroma) and hue-was positively associated with soil redness and temperature, while plumage patterning was positively associated with soil granularity. Together, these plumage-environment associations support both background matching and Gloger's rule, a widespread ecogeographic pattern in animal coloration. We also constructed thermoregulatory models that estimated cooling benefits provided by solar reflectance profiles of the dorsal plumage of each specimen based on the collection site. We found increased cooling benefits in hotter, more arid environments. Finally, cooling benefits were positively associated with residual brightness, such that individuals that were brighter than expected based on environmental conditions also had higher cooling benefits, suggesting a trade-off between camouflage and thermoregulation. Together, these data suggest that natural selection has balanced camouflage and thermoregulation in horned larks, and they illustrate how multiple competing evolutionary pressures may interact to shape geographic variation in adaptive phenotypes.
1 citations
TL;DR: Travis et al. as mentioned in this paper investigated population regulation and density-dependent demography in the Trinidadian guppy and reported no articles citing this article, and found that the majority of the articles cited by the American Naturalist Just Accepted Published for The American Society of Naturalists did not cite this article.
Abstract: Previous articleNext article No AccessPopulation regulation and density‐dependent demography in the Trinidadian guppyJoseph Travis, Ronald D. Bassar, Tim Coulson, Andres Lopez-Sepulcre, and David ReznickJoseph Travis Search for more articles by this author , Ronald D. Bassar Search for more articles by this author , Tim Coulson Search for more articles by this author , Andres Lopez-Sepulcre Search for more articles by this author , and David Reznick Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725796 Views: 71Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
1 citations
TL;DR: In this article , the authors analyzed the impact of mate choice, mating systems, and spatial mating network on the population dynamics for two distinct classes of modification gene drive systems and found that distortion-based gene drives appear to be more robust against mate choice than viability-based ones.
Abstract: Gene drive technology promises to deliver on some of the global challenges humanity faces today in health care, agriculture, and conservation. However, there is a limited understanding of the consequences of releasing self-perpetuating transgenic organisms into wild populations under complex ecological conditions. In this study, we analyze the impact of three such complexities—mate choice, mating systems, and spatial mating network—on the population dynamics for two distinct classes of modification gene drive systems. All three factors had a high impact on the modeling outcome. First, we demonstrate that distortion-based gene drives appear to be more robust against mate choice than viability-based gene drives. Second, we find that gene drive spread is much faster for higher degrees of polygamy. Including a fitness cost, the drive is fastest for intermediate levels of polygamy. Finally, the spread of a gene drive is faster and more effective when the individuals have fewer connections in a spatial mating network. Our results highlight the need to include mating complexities when modeling the properties of gene drives, such as release thresholds, timescales, and population-level consequences. This inclusion will enable a more confident prediction of the dynamics of engineered gene drives and possibly even inform about the origin and evolution of natural gene drives.
TL;DR: In this paper , the authors developed mathematical theory for the population dynamics of microbiomes with their hosts and for holobiont evolution caused by HOG selection, and the objective is to account for the formation of microbiome-host integration.
Abstract: This article develops mathematical theory for the population dynamics of microbiomes with their hosts and for holobiont evolution caused by holobiont selection. The objective is to account for the formation of microbiome-host integration. Microbial population dynamic parameters must mesh with the host’s for coexistence. A horizontally transmitted microbiome is a genetic system with “collective inheritance.” The microbial source pool in the environment corresponds to the gamete pool for nuclear genes. Poisson sampling of the microbial source pool corresponds to binomial sampling of the gamete pool. However, holobiont selection on the microbiome does not lead to a counterpart of the Hardy-Weinberg law or to directional selection that always fixes microbial genes conferring the highest holobiont fitness. A microbe might strike an optimal fitness balance between lowering its within-host fitness while increasing holobiont fitness. Such microbes are replaced by otherwise identical microbes that contribute nothing to holobiont fitness. This replacement can be reversed by hosts that initiate immune responses to nonhelpful microbes. This discrimination leads to microbial species sorting. Host-orchestrated species sorting followed by microbial competition, rather than coevolution or multilevel selection, is predicted to be the cause of microbiome-host integration.
TL;DR: Vandermeer et al. as mentioned in this paper used coupled oscillators in an agroecosystem to integrate direct and indirect effects, and reported no articles citing this paper, but cited the American Naturalist Just Accepted Published for The American Society of Naturalists article.
Abstract: Previous articleNext article No AccessCoupled oscillators in an agroecosystem: Integrating direct and indirect effectsJohn VandermeerJohn Vandermeer Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725439 © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: In this paper , the authors present a mathematical model that demonstrates that seasonal host activity patterns can generate evolutionary bistability in which two evolutionarily stable strategies (ESSs) are possible.
Abstract: AbstractThe timing of seasonal host activity, or host phenology, is an important driver of parasite transmission dynamics and evolution. Despite the vast diversity of parasites in seasonal environments, the impact of phenology on parasite diversity remains relatively understudied. For example, little is known about the selective pressures and environmental conditions that favor a monocyclic strategy (complete a single cycle of infection per season) or a polycyclic strategy (complete multiple cycles). Here, we present a mathematical model that demonstrates that seasonal host activity patterns can generate evolutionary bistability in which two evolutionarily stable strategies (ESSs) are possible. The ESS that a particular system reaches is a function of the virulence strategy initially introduced into the system. The results demonstrate that host phenology can, in theory, maintain diverse parasite strategies among isolated geographic locations.
TL;DR: In this article , the authors apply a macrophysiological approach to understand how hematological traits related to oxygen transport shape elevational ranges in a tropical biodiversity hot spot, finding that birds with greater hematology sensitivity had broader ranges, consistent with the idea that greater acclimatization capacity facilitates elevational range expansion.
Abstract: AbstractThe extent to which species ranges reflect intrinsic physiological tolerances is a major question in evolutionary ecology. To date, consensus has been hindered by the limited tractability of experimental approaches across most of the tree of life. Here, we apply a macrophysiological approach to understand how hematological traits related to oxygen transport shape elevational ranges in a tropical biodiversity hot spot. Along Andean elevational gradients, we measured traits that affect blood oxygen-carrying capacity-total and cellular hemoglobin concentration and hematocrit, the volume percentage of red blood cells-for 2,355 individuals of 136 bird species. We used these data to evaluate the influence of hematological traits on elevational ranges. First, we asked whether the sensitivity of hematological traits to changes in elevation is predictive of elevational range breadth. Second, we asked whether variance in hematological traits changed as a function of distance to the nearest elevational range limit. We found that birds showing greater hematological sensitivity had broader elevational ranges, consistent with the idea that a greater acclimatization capacity facilitates elevational range expansion. We further found reduced variation in hematological traits in birds sampled near their elevational range limits and at high absolute elevations, patterns consistent with intensified natural selection, reduced effective population size, or compensatory changes in other cardiorespiratory traits. Our findings suggest that constraints on hematological sensitivity and local genetic adaptation to oxygen availability promote the evolution of the narrow elevational ranges that underpin tropical montane biodiversity.
TL;DR: In this paper , the authors found that small-leaved Scalesia species were more likely to occupy hotter and drier climates than large-Leaved species, and there was a positive relationship between climatic temperature variability and the breadth of photosynthetic performance.
Abstract: Empirical evidence for the climate variability and performance trade-off hypotheses is limited to animals, and it is unclear whether climate constrains the photosynthetic strategies of plants. The plant genus Scalesia Arn. ex Lindl (family Asteraceae), endemic to the Galápagos archipelago, provides an ideal study system to test these hypotheses because of its species with markedly different leaf morphologies that occupy distinct climatic zones. In this study we tested the classic hypotheses that (1) climate constrains leaf size, (2) high climatic temperature variability selects for thermal generalists (i.e., the climate variability hypothesis), and (3) there is a trade-off between the breadth and rate of photosynthetic performance (i.e., jack-of-all-trades but master of none hypothesis). To do this we measured the leaf morphologies and photosynthetic temperature response curves of 11 Scalesia species. In support of a priori predictions, we found that small-leaved Scalesia species were more likely to occupy hotter and drier climates than large-leaved species, there was a positive relationship between climatic temperature variability and the breadth of photosynthetic performance, and photosynthetic performance was negatively correlated with photosynthetic breadth. Our study is among the first to provide evidence for the performance-breadth trade-off hypothesis in photosynthesis, suggesting that climate change may select for photosynthetic thermal generalists.
TL;DR: Gupte et al. as mentioned in this paper studied the joint evolution of animal movement and competition strategies, and found that animal movement is correlated with competition strategies in the field of natural science.
Abstract: Previous articleNext article No AccessThe Joint Evolution of Animal Movement and Competition StrategiesPratik R. Gupte, Christoph Netz, and Franz J. WeissingPratik R. Gupte Search for more articles by this author , Christoph Netz Search for more articles by this author , and Franz J. Weissing Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725394 Views: 50Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: Ng et al. as mentioned in this paper used time-dependent sensitivity analysis to understand and manage dynamic ecological systems and found that sensitivity analysis can be used to identify the root cause of ecological problems.
Abstract: Next article No AccessA time for every purpose: using time-dependent sensitivity analysis to help understand and manage dynamic ecological systemsWee Hao Ng, Christopher R. Myers, Scott McArt, and Stephen P. EllnerWee Hao Ng Search for more articles by this author , Christopher R. Myers Search for more articles by this author , Scott McArt Search for more articles by this author , and Stephen P. Ellner Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/726143 © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: In this article , the authors show that the presence of hybrid seeds significantly affects conspecific seed size for almost all crosses, such that the seeds are smaller after developing with hybrids sired by fathers with a stronger history of conflict, and are larger after developing by fathers having a weaker history of conflicts.
Abstract: Hybrid seed inviability is a common reproductive barrier in angiosperms. Recent work suggests that the rapid evolution of hybrid seed inviability may, in part, be due to conflict between maternal and paternal optima for resource allocation to developing offspring (i.e., parental conflict). However, parental conflict requires that paternally derived resource-acquiring alleles impose a maternal cost. I test this requirement using three closely related species in the Mimulus guttatus species complex that exhibit significant hybrid seed inviability and differ in their inferred histories of parental conflict. I show that the presence of hybrid seeds significantly affects conspecific seed size for almost all crosses, such that conspecific seeds are smaller after developing with hybrids sired by fathers with a stronger history of conflict and are larger after developing with hybrids sired by fathers with a weaker history of conflict. This work demonstrates a potential maternal cost of paternally derived alleles and also has implications for species fitness in secondary contact.
TL;DR: Kagawa et al. as discussed by the authors showed that host-shift speciation proceeded with gene flow in algae covering shells, and showed that gene flow was correlated with gene migration in algae.
Abstract: Previous articleNext article No AccessHost-shift speciation proceeded with gene flow in algae covering shellsOsamu Kagawa, Shun K. Hirota, Takumi Saito, Shota Uchida, Hiroaki Watanabe, Ryusuke Miyazoe, Takanobu Yamaguchi, Taiki Matsuno, Kouta Araki, Hinata Wakasugi, Sayaka Suzuki, Genki Kobayashi, Hikaru Miyazaki, Yoshihisa Suyama, Takeaki Hanyuda, and Satoshi ChibaOsamu Kagawa Search for more articles by this author , Shun K. Hirota Search for more articles by this author , Takumi Saito Search for more articles by this author , Shota Uchida Search for more articles by this author , Hiroaki Watanabe Search for more articles by this author , Ryusuke Miyazoe Search for more articles by this author , Takanobu Yamaguchi Search for more articles by this author , Taiki Matsuno Search for more articles by this author , Kouta Araki Search for more articles by this author , Hinata Wakasugi Search for more articles by this author , Sayaka Suzuki Search for more articles by this author , Genki Kobayashi Search for more articles by this author , Hikaru Miyazaki Search for more articles by this author , Yoshihisa Suyama Search for more articles by this author , Takeaki Hanyuda Search for more articles by this author , and Satoshi Chiba Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/726221 © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: Haley L. Kenyon and Paul R. Martin this paper proposed no access color as an interspecific badge of status: a comparative test, and found no articles citing this article.
Abstract: Previous articleNext article No AccessColor as an interspecific badge of status: a comparative testHaley L. Kenyon and Paul R. MartinHaley L. Kenyon Search for more articles by this author and Paul R. Martin Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725916 Views: 34Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: Anderson and Renn as mentioned in this paper used evolutionary history to predict mechanistic control of sexually heteromorphic traits using evolutionary history, and proposed the Ancestral Modulation Hypothesis (AMH).
Abstract: Previous articleNext article FreeThe Ancestral Modulation Hypothesis: predicting mechanistic control of sexually heteromorphic traits using evolutionary historyAndrew Patrick Anderson and Suzy CP RennAndrew Patrick Anderson Search for more articles by this author and Suzy CP Renn Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725438 © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: In this paper , the population dynamics of two closely related strains of the halotolerant microalga Dunaliella salina following transfers across salinities were tracked, showing that after a salinity increase, only one of these strains displayed a massive population decline (−69% in 1 h), largely attenuated by exposure to a PCD inhibitor.
Abstract: Environmentally induced reductions in fitness components (survival, fecundity) are generally considered as passive, maladaptive responses to stress. However, there is also mounting evidence for active, programmed forms of environmentally induced cell death in unicellular organisms. While conceptual work has questioned how such programmed cell death (PCD) might be maintained by natural selection, few experimental studies have investigated how PCD influences genetic differences in longer-term fitness across environments. Here, we tracked the population dynamics of two closely related strains of the halotolerant microalga Dunaliella salina following transfers across salinities. We showed that after a salinity increase, only one of these strains displayed a massive population decline (−69% in 1 h), largely attenuated by exposure to a PCD inhibitor. However, this decline was followed by a rapid demographic rebound, characterized by faster growth than the nondeclining strain, such that sharper decline was correlated with faster subsequent growth across experiments and conditions. Strikingly, the decline was more pronounced in conditions more favorable to growth (more light, more nutrients, less competition), further suggesting that it was not simply passive. We explored several hypotheses that could explain this decline-rebound pattern, which suggests that successive stresses could select for higher environmentally induced death in this system.
TL;DR: In this paper , the authors developed an infinite-sites, forward population genetics model showing that together polyembryony's two benefits-reproductive compensation achieved by providing a backup for inviable embryos and the opportunity to favor the fitter of surviving embryos-can favor its evolution.
Abstract: AbstractSimple polyembryony, where one gametophyte produces multiple embryos with different sires but the same maternal haplotype, is common among vascular plants. We develop an infinite-sites, forward population genetics model showing that together polyembryony's two benefits-"reproductive compensation" achieved by providing a backup for inviable embryos and the opportunity to favor the fitter of surviving embryos-can favor its evolution. Our model tests how these factors can favor the evolution of polyembryony and how these underlying benefits of polyembryony shape the genetic load under a range of biological parameters. While these two benefits are difficult to disentangle in nature, we construct variant models of polyembryony that either only include or only exclude the opportunity for reproductive compensation. We find that reproductive compensation strongly favors the evolution of polyembryony and that polyembryony is favored much more weekly in its absence, suggesting that the benefit of a backup embryo is the major force favoring polyembryony. Remarkably, we find nearly identical results in cases in which mutations impact either embryonic or postembryonic fitness (no pleiotropy) and in cases in which mutations have identical effects on embryonic and postembryonic fitness (extreme pleiotropy). Finally, we find that the consequences of polyembryony depend on its function-polyembryony results in a decrease in mean embryonic fitness when acting as a mechanism of embryo compensation and ultimately increases mean embryonic fitness when we exclude this potential benefit.
TL;DR: In this article , no access-fertilization mode covaries with body size and the body size is correlated with the access-access ratio of the fertility mode to body size.
Abstract: Previous articleNext article No AccessFertilization mode covaries with body sizeGeorge Colebrook Jarvis and Dustin J. MarshallGeorge Colebrook Jarvis Search for more articles by this author and Dustin J. Marshall Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725864 Views: 52Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: Dittmar et al. as discussed by the authors found that temporal variation in selection influences microgeographic local adaptation and found that local adaptation is correlated with the temporal variation of the selection process.
Abstract: Previous articleNext article No AccessTemporal variation in selection influences microgeographic local adaptationEmily Loring Dittmar and Doug SchemskeEmily Loring Dittmar Search for more articles by this author and Doug Schemske Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmailPrint SectionsMoreDetailsFiguresReferencesCited by The American Naturalist Just Accepted Published for The American Society of Naturalists Article DOIhttps://doi.org/10.1086/725865 Views: 109Total views on this site © 2023 The University of Chicago. All Rights reserved.PDF download Crossref reports no articles citing this article.
TL;DR: Ketterson et al. as mentioned in this paper presented the American Society of Naturalists (ASN) Lifetime Membership Award for the dark-eyed junco (Junco hyemalis).
Abstract: Previous articleNext article FreeHonorary Lifetime Membership Award: Ellen D. KettersonPDFPDF PLUSFull Text Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinked InRedditEmailQR Code SectionsMoreA small, gray bird flits into view and is gone. We continue driving, or sunning in our backyard, or taking data on the behavior of our study species. What an everyday occurrence: distractedly noting the presence of a very common bird, then turning back to something we consider more important. Some organisms are so common that, paradoxically, they are easy to ignore. It takes someone with a special eye to recognize the insights that might be coaxed from something that is right in front of us and with the dedication to stay with it for years until it gradually reveals its secrets.Such an individual is Dr. Ellen Ketterson, Distinguished Professor of Biology at Indiana University and the newest Honorary Lifetime Member of the American Society of Naturalists (ASN). This honor, limited to 12 individuals at any one time, is intended to recognize senior scientists whose distinguished research careers epitomize the goal of the ASN. New honorary members are chosen through a society-wide nomination process and selection by the ASN Executive Committee at each year’s annual meeting.Ellen received her PhD from Indiana University in 1974 and joined the faculty of its Department of Biology in 1984. She has been director of Indiana University’s Environmental Resilience Institute, whose mission is to develop the forecasts, strategies, and means of communication necessary to enhance resilience to environmental change, and was a founding member of the Center for the Integrative Study of Animal Behavior. She is also affiliated with the Neuroscience Program, the Cognitive Science Program, and the Kinsey Institute. Ellen’s achievements have been recognized by awards from many societies. She has been the recipient of the Cooper Ornithological Society’s prestigious Miller Award for lifetime achievement in ornithological research as well as the Elliott Coues Award of the American Ornithologists’ Union and the Margaret Morse Award of the Wilson Ornithological Society. She is also the recipient of the Distinguished Animal Behaviorist Award of the Animal Behavior Society. She is a fellow of the American Association for the Advancement of Science, the Animal Behavior Society, and the American Academy of Arts and Sciences, and she has been a Guggenheim fellow as well.Ellen has spent much of her career studying the behavior, ecology, and evolution of a single bird species, the dark-eyed junco (Junco hyemalis). Armed with insatiable curiosity and vast patience, she and the many students whose careers she has fostered have, via long-term field and laboratory studies of this ubiquitous North American songbird, fundamentally changed our understanding of organismal biology. Work in the Ketterson lab is firmly grounded in mechanism but expands outward from there, from hormonal regulation of phenotype to long-distance movement in changing environments. Ellen has always put the whole organism front and center. Indeed, her ASN presidential address was titled “What Do Ecology, Evolution, and Behavior Have in Common? The Organism in the Middle” (Ketterson 2020).Ellen’s early work, in the 1970s and 1980s, focused on migration. With her long-time collaborator and late husband, Val Nolan Jr., Ellen showed that dark-eyed juncos exhibit a strong cline in sex ratio during the winter because females migrate farther than males (Ketterson and Nolan 1976, 1983). In the 1980s she established a long-term study of breeding juncos at Mountain Lake Biological Station in southwestern Virginia. There she began her exploration of “phenotypic engineering,” the work for which she is best known today. Each year, males were implanted with testosterone (T) or blank implants early in the breeding season; various consequences of T were then measured. This led to her three most highly cited articles, all published in The American Naturalist (Ketterson et al. 1992; Ketterson and Nolan 1992, 1999). This work is the best demonstration we have that T mediates the trade-off between mating effort and parental effort and is hugely important for understanding the role of hormones in life history evolution in general (see also Casto et al. 2001; Reed et al. 2006). In the late 1990s Ellen and her collaborators initiated studies of T-implanted females. Even though most females have detectable T levels, its role had been largely neglected until these studies (Clotfelter et al. 2004; Ketterson et al. 2005; O’Neal et al. 2008). The lab subsequently extended this work to study variation in T in natural populations, studies that were again published in The American Naturalist. They showed that increased T production was related to decreased parental behavior and increased territoriality and that T production was under stabilizing selection overall (McGlothlin et al. 2007, 2010).Around the same time, Ellen started studying population differentiation in juncos in collaboration with Trevor Price, who had first described the population of juncos that colonized the campus of the University of California, San Diego. The team subsequently showed rapid evolution in behavior and morphology. Again, some of the most exciting articles reporting on this work have been published in this journal (e.g., Atwell et al. 2014).Ellen’s research continues. She and her collaborators have recently been investigating differences in physiology between residents and migrants (e.g., Fudickar et al. 2016), have expanded work in the junco to include the study of communication via odor (Whittaker et al. 2013), and have even been involved in sequencing the junco genome (Friis et al. 2022).We note that Ellen’s achievements range far beyond science. Among her extensive service contributions, she has served the ASN with great distinction, both as president in 2015 and as associate editor of The American Naturalist for many years. Throughout her career, she has been a dedicated mentor of undergraduates, graduate students, and postdoctoral fellows. Finally, she has used the dark-eyed junco system to inspire students and the wider public. Through creative use of media, Ellen uses this one common songbird not only to teach principles of evolution, behavior, and ecology but also to illustrate how scientists come to know what they know. We especially encourage readers to view and to use her fine film, The Ordinary Extraordinary Junco (https://juncoproject.org/), which is freely available to the public.Considered as a whole organism, as she would no doubt like us to, Ellen Ketterson exemplifies the characteristics that the ASN holds in highest regard. She is a consummate scholar who has produced seminal insights at the intersection of behavior, ecology, and evolution. While these are the accomplishments for which we award Ellen the ASN’s highest recognition, we also hail her generosity of spirit, as exemplified by her extraordinary teaching, mentoring, outreach, and professional service.The ASN congratulates you, Ellen, on this honor. It is just one more feather in your already impressive plumage.Judith L. Bronstein, on behalf of the American Society of NaturalistsAcknowledgmentsI thank the nominators and ASN Executive Committee for their fine work during the nomination and selection process. Thanks too to Joel McGlothlin and Curt Lively for sharing their insights into Ellen Ketterson’s career and “greatest hits.”Literature CitedAtwell, J. W., G. C. Cardoso, D. J. Whittaker, T. D. Price, and E. D. Ketterson. 2014. Hormonal, behavioral, and life-history traits exhibit correlated shifts in relation to population establishment in a novel environment. American Naturalist 184:E147–E160.First citation in articleLinkGoogle ScholarCasto, J. M., V. Nolan Jr., and E. D. Ketterson. 2001. Steroid hormones and immune function: experimental studies in wild and captive dark-eyed juncos (Junco hyemalis). American Naturalist 157:408–420.First citation in articleLinkGoogle ScholarClotfelter, E. D., D. M. O’Neal, J. M. Gaudioso, J. M. Casto, I. M. Parker-Renga, E. A. Snajdr, D. L. Duffy, et al. 2004. Consequences of elevating plasma testosterone in females of a socially monogamous songbird: evidence of constraints on male evolution? Hormones and Behavior 46:171–178.First citation in articleCrossref MedlineGoogle ScholarFriis, G., J. Vizueta, E. D. Ketterson, and B. Mila. 2022. A high-quality genome assembly and annotation of the dark-eyed junco Junco hyemalis, a recently diversified songbird. G3: Genes, Genomes, Genetics 12:jkac083.First citation in articleGoogle ScholarFudickar, A. M., T. J. Greives, J. W. Atwell, C. A. Stricker, and E. D. Ketterson. 2016. Reproductive allochrony in seasonally sympatric populations maintained by differential response to photoperiod: implications for population divergence and response to climate change. American Naturalist 187:436–446.First citation in articleLinkGoogle ScholarKetterson, E. D. 2020. What do ecology, evolution, and behavior have in common? the organism in the middle. American Naturalist 196:103–118.First citation in articleLinkGoogle ScholarKetterson, E. D., and V. Nolan Jr. 1976. 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Hormones and Behavior 54:571–578.First citation in articleCrossref MedlineGoogle ScholarReed, W. L., M. E. Clark, P. G. Parker, S. A. Raouf, N. Arguedas, D. S. Monk, E. Snajdr, et al. 2006. Physiological effects on demography: a long-term experimental study of testosterone’s effects on fitness. American Naturalist 167:667–683.First citation in articleLinkGoogle ScholarWhittaker, D. J., N. M. Gerlach, H. A. Soini, M. V. Novotny, and E. D. Ketterson. 2013. Bird odour predicts reproductive success. Animal Behaviour 86:697–703.First citation in articleCrossrefGoogle Scholar Previous articleNext article DetailsFiguresReferencesCited by The American Naturalist Volume 201, Number 3March 2023 Published for The American Society of Naturalists HistoryPublished online January 13, 2023 © 2023 The University of Chicago. All rights reserved.PDF download Crossref reports no articles citing this article.