Preprints
Filtering by Subject: Evolution
Detecting context-dependence in the expression of life history tradeoffs
Published: 2023-12-07
Subjects: Ecology and Evolutionary Biology, Evolution, Population Biology
Life history tradeoffs are one of the central tenets of evolutionary demography. Tradeoffs, depicting negative covariances between individuals’ life history traits, can arise from genetic constraints, or from a finite amount of resources that each individual has to allocate in a zero-sum game between somatic and reproductive functions. While theory predicts that tradeoffs are ubiquitous, [...]
Natural selection is less efficient at species range edges
Published: 2023-12-06
Subjects: Biodiversity, Ecology and Evolutionary Biology, Evolution, Life Sciences
Changing species distributions due to global change underscore a pressing need to better understand range limits. However, our knowledge of general determinants of range limits remains poor despite over a century of work. Theoretical models demonstrate that genetic drift should strengthen across environmental gradients. This can limit natural selection to the point where populations can no longer [...]
Honest Signalling Made Simple
Published: 2023-11-24
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
Honest communication is a common phenomenon in animal behaviour, and is frequently explained by appeal to the so-called handicap hypothesis by which signal costs deter dishonesty. However, the handicap models commonly used to explain honest signalling have has been subject to several lines of criticism in recent literature. This trend may have led researchers outside of the field of animal [...]
Covariance reaction norms: A flexible method for estimating complex environmental effects on trait (co)variances
Published: 2023-11-21
Subjects: Behavior and Ethology, Biology, Ecology and Evolutionary Biology, Evolution, Genetics, Integrative Biology, Life Sciences, Population Biology, Research Methods in Life Sciences, Zoology
Estimating quantitative genetic and phenotypic (co)variances is crucial for investigating evolutionary ecological phenomena such as developmental integration, life history tradeoffs, and niche specialization, as well as for describing selection and predicting multivariate evolution in the wild. While most studies assume (co)variances are fixed over short timescales, environmental heterogeneity [...]
Darwin’s road not taken: white sclera, shared intentionality, niche construction, predator fear, teams and Homo origins
Published: 2023-11-04
Subjects: Behavior and Ethology, Evolution, Neuroscience and Neurobiology
Palaeoanthropologists have yet to pinpoint how Homo evolved from Australopithecus. I propose niche construction ending predator ambush and stalking attacks, white sclera, and ultrafast team cognition were key. Human white sclera allows the quick, distant detection of line-of-sight. This is unique. In other primates, predators eliminate conspicuous-eyed individuals. Consequently, nonhuman [...]
Maternal investment and early thermal conditions affect performance and antipredator responses
Published: 2023-10-27
Subjects: Behavior and Ethology, Biology, Evolution, Other Ecology and Evolutionary Biology
Exposure to increased temperatures during early development can lead to phenotypic plasticity in morphology, physiology, and behaviour across a range of ectothermic animals. In addition, maternal effects are known to be important contributors to phenotypic variation in offspring. Whether the two factors interact to shape offspring morphology and behaviour has been barely explored. This is [...]
When the microbiome shapes the host: immune evolution implications for infectious disease
Published: 2023-10-23
Subjects: Ecology and Evolutionary Biology, Environmental Microbiology and Microbial Ecology Life Sciences, Evolution, Immunity, Immunology and Infectious Disease, Immunology of Infectious Disease, Life Sciences, Molecular Genetics, Pathogenic Microbiology
The microbiome includes both “mutualist” and “pathogen” microbes, regulated by the same innate immune architecture. A major question has therefore been: how do hosts prevent pathogenic infections while maintaining beneficial microbes? One idea suggests hosts can selectively activate innate immunity upon pathogenic infection, but not mutualist colonisation. Another idea posits that hosts can [...]
Inferring the evolutionary history of the Sino-Himalayan biodiversity hotspot using Bayesian phylodynamics
Published: 2023-10-14
Subjects: Biodiversity, Ecology and Evolutionary Biology, Evolution
The current status of the Sino-Himalayan region as a biodiversity hotspot, particularly for flora, has often been linked to the uplift of the Sino-Tibetan Plateau and Himalayan and Hengduan Mountains. However, the relationship between the topological development of the region and the onset of diversification is yet to be confirmed. Here, we apply Bayesian phylodynamic methods to a large phylogeny [...]
A global analysis reveals the dynamic relationship between sexual selection and population abundance in space and time
Published: 2023-09-17
Subjects: Ecology and Evolutionary Biology, Evolution
Sexual selection leads to the evolution of extravagant weaponry or ornamental displays, with the bearer of these traits gaining a reproductive advantage, potentially at a cost to the individual’s survival. The consequences of sexual selection can therefore impact species demographic processes and overall abundance. Currently, evidence connecting the effects of sexual selection to demography and [...]
Relative abundance distributions reveal constraints on tetrapod community diversity
Published: 2023-08-22
Subjects: Biodiversity, Evolution
Previous efforts to understand the pace of species diversification through time have disagreed over whether species diversity is unbounded or limited by a carrying capacity. Tetrapods (limbed vertebrates) have frequently been employed as a case-study in examinations of this issue, with studies of diversity being used to support both sides. Here, we examine the shape of relative abundance [...]
The unfulfilled potential of dogs in studying behavioural ecology and evolution during the Anthropocene
Published: 2023-08-07
Subjects: Behavior and Ethology, Evolution, Life Sciences, Other Ecology and Evolutionary Biology, Zoology
Dogs are an exceptional resource for studying ecological, behavioural and evolutionary processes. However, several widespread misconceptions limit our understanding of dog behaviour and inhibit the use of dogs as model study systems in diverse areas of biological science. These include extensive anthropomorphisation of dog behaviour, a profound bias towards almost exclusively studying pet dogs, a [...]
The untapped potential of phage model systems as therapeutic agents
Published: 2023-07-28
Subjects: Biology, Evolution, Life Sciences, Medical Microbiology, Microbiology
With the emergence of widespread antibiotic resistance, phages are an appealing alternative to antibiotics in the fight against multidrug-resistant bacteria. Over the past few years, many phages have been isolated from various environments to treat bacterial pathogens. While isolating novel phages for treatment has had some success for compassionate use, developing novel phages into a general [...]
Fixation probability and fixation time under strong recurrent mutation
Published: 2023-07-16
Subjects: Evolution, Life Sciences
When the mutation rate is high and/or the population size is large, recurrent mutation can lead to multiple, independently generated copies of the same beneficial allele spreading through the population. However, classical analyses of fixation probability and time assume that the mutation rate is low and therefore, that fixation and extinction of a beneficial allele occur faster than the [...]
Hypotheses on the extended phenotype of the mitochondrion: sex, mortality, and aging
Published: 2023-06-19
Subjects: Biology, Evolution
How did sex evolve, how is sex evolutionary stable, and why do eukaryotes appear mortal. This paper presents a mitochondrial perspective on the evolution of the eukaryotic cell that appears capable of answering these questions. Rather than viewing a mitochondrion as a passive entity taken up by an archaeal host that remains in the driving seat, mitochondria are viewed as the key force [...]
Plio-Pleistocene African megaherbivore losses associated with community biomass restructuring
Published: 2023-06-09
Subjects: Ecology and Evolutionary Biology, Evolution
Fossil abundance data can reveal ecological dynamics underpinning taxonomic declines. Using fossil dental metrics, we reconstructed body mass and mass-abundance distributions in Late Miocene to recent African large mammal communities. Despite collection biases, fossil and extant mass-abundance distributions are highly similar, with unimodal distributions likely reflecting savanna environments. [...]