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Coinfection Timing Drives Host Population Dynamics through Changes in Virulence
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - December 13, 2017 Category: Zoology Authors: Katherine M. Marchetto Alison G. Power Source Type: research

A Dynamic State Model of Migratory Behavior and Physiology to Assess the Consequences of Environmental Variation and Anthropogenic Disturbance on Marine Vertebrates
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - December 13, 2017 Category: Zoology Authors: Enrico Pirotta Marc Mangel Daniel P. Costa Bruce Mate Jeremy A. Goldbogen Daniel M. Palacios Luis A. H ückstädt Elizabeth A. McHuron Lisa Schwarz Leslie New Source Type: research

Leaf Form Evolution in Viburnum Parallels Variation within Individual Plants
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - December 8, 2017 Category: Zoology Authors: Elizabeth L. Spriggs Samuel B. Schmerler Erika J. Edwards Michael J. Donoghue Source Type: research

Life-History Traits Evolved Jointly with Climatic Niche and Disturbance Regime in the Genus Leucadendron (Proteaceae)
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - December 5, 2017 Category: Zoology Authors: Jeanne Tonnabel Frank M. Schurr Florian Boucher Wilfried Thuiller Julien Renaud Emmanuel J. P. Douzery Oph élie Ronce Source Type: research

Using Human Vision to Detect Variation in Avian Coloration: How Bad Is It?
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - December 1, 2017 Category: Zoology Authors: Zachary T. Bergeron Rebecca C. Fuller Source Type: research

A Migratory Divide in the Painted Bunting (Passerina ciris)
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 29, 2017 Category: Zoology Authors: C. J. Battey Ethan B. Linck Kevin L. Epperly Cooper French David L. Slager Paul W. Sykes John Klicka Source Type: research

Keystone Individuals Alter Ecological and Evolutionary Consumer-Resource Dynamics
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 29, 2017 Category: Zoology Authors: Denon Start Source Type: research

Rising Variability, Not Slowing Down, as a Leading Indicator of a Stochastically Driven Abrupt Transition in a Dryland Ecosystem
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 29, 2017 Category: Zoology Authors: Ning Chen Ciriyam Jayaprakash Kailiang Yu Vishwesha Guttal Source Type: research

Letter from the Editor
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 28, 2017 Category: Zoology Authors: Daniel I. Bolnick Source Type: research

Seasonal Food Scarcity Prompts Long-Distance Foraging by a Wild Social Bee
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 28, 2017 Category: Zoology Authors: Nathaniel S. Pope Shalene Jha Source Type: research

Sex-Specific Heterogeneity in Fixed Morphological Traits Influences Individual Fitness in a Monogamous Bird Population
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 28, 2017 Category: Zoology Authors: Floriane Plard Susanne Schindler Rapha ël Arlettaz Michael Schaub Source Type: research

Is Plant Fitness Proportional to Seed Set? An Experiment and a Spatial Model.
Abstract Individual differences in fecundity often serve as proxies for differences in overall fitness, especially when it is difficult to track the fate of an individual's offspring to reproductive maturity. Using fecundity may be biased, however, if density-dependent interactions between siblings affect survival and reproduction of offspring from high- and low-fecundity parents differently. To test for such density-dependent effects in plants, we sowed seeds of the wildflower Ipomopsis aggregata (scarlet gilia) to mimic partially overlapping seed shadows of pairs of plants, one of which produced twice as many se...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Campbell DR, Brody AK, Price MV, Waser NM, Aldridge G Tags: Am Nat Source Type: research

Catastrophic Shifts in Semiarid Vegetation-Soil Systems May Unfold Rapidly or Slowly.
Abstract Under gradual change of a driver, complex systems may switch between contrasting stable states. For many ecosystems it is unknown how rapidly such a critical transition unfolds. Here we explore the rate of change during the degradation of a semiarid ecosystem with a model coupling the vegetation and geomorphological system. Two stable states-vegetated and bare-are identified, and it is shown that the change between these states is a critical transition. Surprisingly, the critical transition between the vegetated and bare state can unfold either rapidly over a few years or gradually over decennia up to mil...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Karssenberg D, Bierkens MFP, Rietkerk M Tags: Am Nat Source Type: research

Predator Persistence through Variability of Resource Productivity in Tritrophic Systems.
Abstract The trophic structure of species communities depends on the energy transfer between trophic levels. Primary productivity varies strongly through time, challenging the persistence of species at higher trophic levels. Yet resource variability has mostly been studied in systems with only one or two trophic levels. We test the effect of variability in resource productivity in a tritrophic model system including a resource, a size-structured consumer, and a size-specific predator. The model complies with fundamental principles of mass conservation and the body-size dependence of individual-level energetics and...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Soudijn FH, de Roos AM Tags: Am Nat Source Type: research

Drivers of Diversification in Individual Life Courses.
er UK Abstract Heterogeneity in life courses among individuals of a population influences the speed of adaptive evolutionary processes, but it is less clear how biotic and abiotic environmental fluctuations influence such heterogeneity. We investigate principal drivers of variability in sequence of stages during an individual's life in a stage-structured population. We quantify heterogeneity by measuring population entropy of a Markov chain, which computes the rate of diversification of individual life courses. Using individual data of a primate population, we show that density regulates the stage composition of t...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Hernández-Pacheco R, Steiner UK Tags: Am Nat Source Type: research

Treasurer's Report, 2016: Statement of Activities For the year ending December 31, 2016.
PMID: 29166156 [PubMed - in process] (Source: The American Naturalist)
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Simms E Tags: Am Nat Source Type: research

Rapid Diversification and Time Explain Amphibian Richness at Different Scales in the Tropical Andes, Earth's Most Biodiverse Hotspot.
Abstract The Tropical Andes make up Earth's most species-rich biodiversity hotspot for both animals and plants. Nevertheless, the ecological and evolutionary processes underlying this extraordinary richness remain uncertain. Here, we examine the processes that generate high richness in the Tropical Andes relative to other regions in South America and across different elevations within the Andes, using frogs as a model system. We combine distributional data, a newly generated time-calibrated phylogeny for 2,318 frog species, and phylogenetic comparative methods to test the relative importance of diversification rat...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Hutter CR, Lambert SM, Wiens JJ Tags: Am Nat Source Type: research

Secretary's Report, 2017: American Society of Naturalists.
PMID: 29166158 [PubMed - in process] (Source: The American Naturalist)
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Lau J Tags: Am Nat Source Type: research

Local Regulation of Trail Networks of the Arboreal Turtle Ant, Cephalotes goniodontus.
This study examines how an arboreal ant colony maintains, extends, and repairs its network of foraging trails and nests, built on a network of vegetation. Nodes are junctions where a branch forks off from another or where a branch of one plant touching another provides a new edge on which ants could travel. The ants' choice of edge at a node appears to be reinforced by trail pheromone. Ongoing pruning of the network tends to eliminate cycles and minimize the number of nodes and thus decision points, but not the distance traveled. At junctions, trails tend to stay on the same plant. In combination with the long internode le...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Gordon DM Tags: Am Nat Source Type: research

Sex-Dependent Phenological Plasticity in an Arctic Hibernator.
Abstract Hibernation provides a means of escaping the metabolic challenges associated with seasonality, yet the ability of mammals to prolong or reenter seasonal dormancy in response to extreme weather events is unclear. Here, we show that Arctic ground squirrels in northern Alaska exhibited sex-dependent plasticity in the physiology and phenology of hibernation in response to a series of late spring snowstorms in 2013 that resulted in the latest snowmelt on record. Females and nonreproductive males responded to the>1-month delay in snowmelt by extending heterothermy or reentering hibernation after several days...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Williams CT, Buck CL, Sheriff MJ, Richter MM, Krause JS, Barnes BM Tags: Am Nat Source Type: research

Will Invertebrates Require Increasingly Carbon-Rich Food in a Warming World?
Abstract Elevated temperature causes metabolism and respiration to increase in poikilothermic organisms. We hypothesized that invertebrate consumers will therefore require increasingly carbon-rich diets in a warming environment because the increased energetic demands are primarily met using compounds rich in carbon, that is, carbohydrates and lipids. Here, we test this hypothesis using a new stoichiometric model that has carbon (C) and nitrogen (N) as currencies. Model predictions did not support the hypothesis, indicating instead that the nutritional requirements of invertebrates, at least in terms of food qualit...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Anderson TR, Hessen DO, Boersma M, Urabe J, Mayor DJ Tags: Am Nat Source Type: research

Stochastic Evolutionary Demography under a Fluctuating Optimum Phenotype.
Abstract Many natural populations exhibit temporal fluctuations in abundance that are consistent with external forcing by a randomly changing environment. As fitness emerges from an interaction between the phenotype and the environment, such demographic fluctuations probably include a substantial contribution from fluctuating phenotypic selection. We study the stochastic population dynamics of a population exposed to random (plus possibly directional) changes in the optimum phenotype for a quantitative trait that evolves in response to this moving optimum. We derive simple analytical predictions for the distributi...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Chevin LM, Cotto O, Ashander J Tags: Am Nat Source Type: research

Clarification.
PMID: 29166163 [PubMed - in process] (Source: The American Naturalist)
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Vergara D, Jokela J, Lively CM Tags: Am Nat Source Type: research

A Physiological Signature of the Cost of Reproduction Associated with Parental Care.
Abstract Costs of reproduction are an integral and long-standing component of life-history theory, but we still know relatively little about the specific physiological mechanisms underlying these trade-offs. We experimentally manipulated workload during parental care in female European starlings (Sturnus vulgaris) using attachment of radios and/or wing clipping and assessed measures of workload, current breeding productivity, future fecundity, and survival (local return rate) in relation to treatment. Females with wing clipping and radio attachment paid a clear cost of reproduction compared with all other treatmen...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Fowler MA, Williams TD Tags: Am Nat Source Type: research

The Rate of Seasonal Changes in Temperature Alters Acclimation of Performance under Climate Change.
n F Abstract How the ability to acclimate will impact individual performance and ecological interactions under climate change remains poorly understood. Theory predicts that the benefit an organism can gain from acclimating depends on the rate at which temperatures change relative to the time it takes to induce beneficial acclimation. Here, we present a conceptual model showing how slower seasonal changes under climate change can alter species' relative performance when they differ in acclimation rate and magnitude. To test predictions from theory, we performed a microcosm experiment where we reared a mid- and a h...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Nilsson-Örtman V, Johansson F Tags: Am Nat Source Type: research

Coevolution between Mutualists and Parasites in Symbiotic Communities May Lead to the Evolution of Lower Virulence.
Abstract Most eukaryotes harbor a diverse community of parasitic, mutualistic, and commensal microbial symbionts. Although the diversity of these microbial symbiotic communities has recently drawn considerable attention, theory regarding the evolution of interactions among symbionts and with the host is still in its nascent stages. Here we evaluate the role of interactions among coinfecting symbionts in the evolution of symbiont virulence toward the host. To do so, we place the virulence-transmission trade-off into a community context and model the evolution of symbiont trophic modes along the continuum from paras...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Nelson PG, May G Tags: Am Nat Source Type: research

Kinship and Incest Avoidance Drive Patterns of Reproductive Skew in Cooperatively Breeding Birds.
Abstract Social animals vary in how reproduction is divided among group members, ranging from monopolization by a dominant pair (high skew) to equal sharing by cobreeders (low skew). Despite many theoretical models, the ecological and life-history factors that generate this variation are still debated. Here I analyze data from 83 species of cooperatively breeding birds, finding that kinship within the breeding group is a powerful predictor of reproductive sharing across species. Societies composed of nuclear families have significantly higher skew than those that contain unrelated members, a pattern that holds for...
Source: The American Naturalist - November 24, 2017 Category: Biology Authors: Riehl C Tags: Am Nat Source Type: research

Treasurer ’s Report, 2016: Statement of Activities
The American Naturalist,Volume 190, Issue 6, Page 863-864, December 2017. (Source: The American Naturalist)
Source: The American Naturalist - November 22, 2017 Category: Zoology Authors: Ellen Simms Source Type: research

Secretary ’s Report, 2017: American Society of Naturalists
The American Naturalist,Volume 190, Issue 6, Page 860-862, December 2017. (Source: The American Naturalist)
Source: The American Naturalist - November 22, 2017 Category: Zoology Authors: Jennifer Lau Source Type: research

Masthead
The American Naturalist,Volume 190, Issue 6, December 2017. (Source: The American Naturalist)
Source: The American Naturalist - November 22, 2017 Category: Zoology Source Type: research

Mechanisms of Assortative Mating in Speciation with Gene Flow: Connecting Theory and Empirical Research
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 21, 2017 Category: Zoology Authors: Michael Kopp Maria R. Servedio Tamra C. Mendelson Rebecca J. Safran Rafael L. Rodr íguez Mark E. Hauber Elizabeth C. Scordato Laurel B. Symes Christopher N. Balakrishnan David M. Zonana G. Sander van Doorn Source Type: research

Learning to Cooperate: The Evolution of Social Rewards in Repeated Interactions
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 20, 2017 Category: Zoology Authors: Slimane Dridi Erol Ak çay Source Type: research

Offspring Size and Reproductive Allocation in Harvester Ants
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 17, 2017 Category: Zoology Authors: Diane C. Wiernasz Blaine J. Cole Source Type: research

Temporal Variation in Predation Risk May Explain Daily Rhythms of Foraging Behavior in an Orb-Weaving Spider
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 9, 2017 Category: Zoology Authors: J. Colton Watts Thomas C. Jones Ashley Herrig Madeleine Miller Brigitte Tenhumberg Source Type: research

Do Sperm Really Compete and Do Eggs Ever Have a Choice? Adult Distribution and Gamete Mixing Influence Sexual Selection, Sexual Conflict, and the Evolution of Gamete Recognition Proteins in the Sea
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 6, 2017 Category: Zoology Authors: Don R. Levitan Source Type: research

2017 American Society of Naturalists Awards
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 3, 2017 Category: Zoology Source Type: research

The Price Equation, Gradient Dynamics, and Continuous Trait Game Theory
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 3, 2017 Category: Zoology Authors: Jussi Lehtonen Source Type: research

Theoretical Approaches in Evolutionary Ecology: Environmental Feedback as a Unifying Perspective
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 3, 2017 Category: Zoology Authors: S ébastien Lion Source Type: research

Loss of Color Pigmentation Is Maintained at High Frequency in a Monkey Flower Population
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 3, 2017 Category: Zoology Authors: Alex D. Twyford Aaron M. Caola Pratibha Choudhary Ramesh Raina Jannice Friedman Source Type: research

Kinship and Incest Avoidance Drive Patterns of Reproductive Skew in Cooperatively Breeding Birds
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - November 2, 2017 Category: Zoology Authors: Christina Riehl Source Type: research

Thermoregulatory Behavior Simultaneously Promotes and Forestalls Evolution in a Tropical Lizard
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - October 25, 2017 Category: Zoology Authors: Martha M. Mu ñoz Jonathan B. Losos Source Type: research

Rapid Diversification and Time Explain Amphibian Richness at Different Scales in the Tropical Andes, Earth ’s Most Biodiverse Hotspot
The American Naturalist, Ahead of Print. (Source: The American Naturalist)
Source: The American Naturalist - October 23, 2017 Category: Zoology Authors: Carl R. Hutter Shea M. Lambert John J. Wiens Source Type: research

Fatal Attraction? Intraguild Facilitation and Suppression among Predators.
Abstract Competition and suppression are recognized as dominant forces that structure predator communities. Facilitation via carrion provisioning, however, is a ubiquitous interaction among predators that could offset the strength of suppression. Understanding the relative importance of these positive and negative interactions is necessary to anticipate community-wide responses to apex predator declines and recoveries worldwide. Using state-sponsored wolf (Canis lupus) control in Alaska as a quasi experiment, we conducted snow track surveys of apex, meso-, and small predators to test for evidence of carnivore casc...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Sivy KJ, Pozzanghera CB, Grace JB, Prugh LR Tags: Am Nat Source Type: research

The Evolution of Clutch Size in Hosts of Avian Brood Parasites.
We describe a model of the evolution of clutch size, which challenges this logic and shows instead that an increase in clutch size (or no change) should evolve in hosts. We test this prediction using a broad-scale comparative analysis to ask whether there are differences in clutch size within hosts and between hosts and nonhosts. Consistent with our model, this analysis revealed that host species do not have smaller clutches and that hosts that incur larger costs from raising a parasite lay larger clutches. We suggest that brood parasitism might be an influential factor in clutch-size evolution and could potentially select...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Medina I, Langmore NE, Lanfear R, Kokko H Tags: Am Nat Source Type: research

The Roles of Sexual and Viability Selection in the Evolution of Incomplete Reproductive Isolation: From Allopatry to Sympatry.
Abstract In recent years, theoretical models have introduced the concept that ongoing hybridization between "good" species can occur because incomplete reproductive isolation can be a selected optimum. They furthermore show that positive frequency-dependent sexual selection, which is naturally generated by some of the underlying processes that lead to assortative mating, plays a key role in the evolution of incomplete reproductive isolation. This occurs, however, through different mechanisms in sympatric versus allopatric scenarios. We investigate the evolution of incomplete reproductive isolation by sex...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Cotto O, Servedio MR Tags: Am Nat Source Type: research

Bioinvasion Triggers Rapid Evolution of Life Histories in Freshwater Snails.
vid P Abstract Biological invasions offer interesting situations for observing how novel interactions between closely related, formerly allopatric species may trigger phenotypic evolution in situ. Assuming that successful invaders are usually filtered to be competitively dominant, invasive and native species may follow different trajectories. Natives may evolve traits that minimize the negative impact of competition, while trait shifts in invasives should mostly reflect expansion dynamics, through selection for colonization ability and transiently enhanced mutation load at the colonization front. These ideas were ...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Chapuis E, Lamy T, Pointier JP, Juillet N, Ségard A, Jarne P, David P Tags: Am Nat Source Type: research

Cannibalism and Intraguild Predation Community Dynamics: Coexistence, Competitive Exclusion, and the Loss of Alternative Stable States.
Abstract Predators often exert strong top-down regulation of prey, but in many systems, juvenile predators must compete with their future prey for a shared resource. In such life-history intraguild predation (LHIGP) systems, prey can therefore also regulate the recruitment and thus population dynamics of their predator via competition. Theory predicts that such stage-structured systems exhibit a wide range of dynamics, including alternative stable states. Here we show that cannibalism is an exceedingly common interaction within natural LHIGP systems that determines what coexistence states are possible. Using a mod...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Toscano BJ, Hin V, Rudolf VHW Tags: Am Nat Source Type: research

Habitat Association Predicts Genetic Diversity and Population Divergence in Amazonian Birds.
Abstract The ecological traits of organisms may predict their genetic diversity and population genetic structure and mediate the action of evolutionary processes important for speciation and adaptation. Making these ecological-evolutionary links is difficult because it requires comparable genetic estimates from many species with differing ecologies. In Amazonian birds, habitat association is an important component of ecological diversity. Here, we examine the link between habitat association and genetic parameters using 20 pairs of closely related Amazonian bird species in which one member of the pair occurs prima...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Harvey MG, Aleixo A, Ribas CC, Brumfield RT Tags: Am Nat Source Type: research

Artificial Selection to Increase the Phenotypic Variance in gmax Fails.
Abstract Stabilizing selection is important in evolutionary theories of the maintenance of genetic variance and has been invoked as the key process determining macroevolutionary patterns of trait evolution. However, manipulative evidence for the extent of stabilizing selection, particularly on multivariate traits, is lacking. We used artificial disruptive selection in Drosophila serrata as a tool to determine the relative strength of stabilizing selection experienced by multivariate trait combinations with contrasting levels of genetic and mutational variance. Contrary to expectation, when disruptive selection was...
Source: The American Naturalist - October 21, 2017 Category: Biology Authors: Sztepanacz JL, Blows MW Tags: Am Nat Source Type: research

Frontispiece.
Authors: PMID: 29053362 [PubMed - in process] (Source: The American Naturalist)
Source: The American Naturalist - October 21, 2017 Category: Biology Tags: Am Nat Source Type: research