Preprints
Filtering by Subject: Evolution
Natural variation in the growth and development of Protopiophila litigata (Diptera: Piophilidae) developing in three moose (Artiodactyla: Cervidae) antlers
Published: 2020-03-17
Subjects: Ecology and Evolutionary Biology, Entomology, Evolution, Life Sciences, Population Biology
In animals, the early-life environment influences growth and development, which can have lasting effects on life history and fitness into adulthood. We investigated patterns of growth, pupal development time, and their covariation, in wild antler fly larvae (Protopiophila litigata; Diptera: Piophilidae) of both sexes collected from three discarded moose antlers of varying size, chewing damage [...]
The molecular clock as a tool for understanding host-parasite evolution
Published: 2020-02-29
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
The molecular clock in combination with evidence from the geological record can be applied to infer the timing and dynamics of evolutionary events. This has enormous potential to shed light on the complex and often evasive evolution of parasites. Here, we provide an overview of molecular clock methodology and recent advances that increase the potential for the study of host-parasite [...]
Countergradient variation in reptiles: thermal sensitivity of developmental and metabolic rates across locally adapted populations
Published: 2020-02-08
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
Environmental temperature is a key driver of variation in physiological developmental rates in reptiles. Cooler temperatures extend development time and increase the amount of energy required to achieve hatching success, which can pose fitness consequences later in life. Yet, in locally-adapted populations, genetic variation often opposes environmental variation across ecological gradients, known [...]
Comparing ecological and evolutionary variability within datasets
Published: 2020-01-29
Subjects: Behavior and Ethology, Ecology and Evolutionary Biology, Evolution, Genetics and Genomics, Life Sciences, Other Ecology and Evolutionary Biology, Other Genetics and Genomics, Social and Behavioral Sciences
Many key questions in evolutionary ecology require the use of variance ratios such as heritability, repeatability, and individual resource specialization. These ratios allow to understand how phenotypic variation is structured into genetic and non-genetic components, to identify how much organisms vary in the resources they use or how functional traits structure species communities. Understanding [...]
Dunnock social status correlates with sperm speed, but fast sperm does not always equal high fitness
Published: 2020-01-25
Subjects: Behavior and Ethology, Ecology and Evolutionary Biology, Evolution, Life Sciences
Sperm competition theory predicts that males should modulate sperm investment according to their social status. Sperm speed (one proxy of sperm quality) also influences the outcome of sperm competition because fast sperm cells may fertilize eggs before slow sperm cells. We evaluated whether the social status of males predicted their sperm speed in a wild population of dunnocks (Prunella [...]
Sex- and context-specific associations between personality and a measure of fitness but no link with life history traits
Published: 2019-11-22
Subjects: Behavior and Ethology, Biology, Ecology and Evolutionary Biology, Evolution, Life Sciences
The pace of life syndrome hypothesis posits that personality traits (i.e., consistent individual differences in behaviour) are linked to life history and fitness. Specifically, fast-paced individuals are predicted to be proactive (i.e., active and aggressive) with an earlier age at first reproduction, a shorter lifespan, and a higher fecundity than slow-paced individuals. Environmental conditions [...]
Environmental effects on the covariation among pace-of-life traits
Published: 2019-11-21
Subjects: Behavior and Ethology, Ecology and Evolutionary Biology, Evolution, Life Sciences
Pace-of-life syndromes (POLSs) are suites of life-history, physiological and behavioral traits that arise due to trade-offs between allocation to current and future reproduction. Traits generally show covariation that can arise from genetic and environmental influences on phenotypes and constrain the independent evolution of traits, resulting in fitness consequences and impacts on population [...]
Decoupled morphological and biomechanical evolution and diversification of the wing in bats
Published: 2019-11-06
Subjects: Animal Sciences, Ecology and Evolutionary Biology, Evolution, Life Sciences
Bats use their forelimbs in different ways, flight being the most notable example of morphological adaptation. However, different behavioural specializations beyond flight have also been described in several bat lineages. Understanding the postcranial evolution during the locomotory and behavioural diversification of bats is fundamental to understanding bat evolution. We investigate whether [...]
Selection on reproductive plasticity in a wild population of blue tits, Cyanistes caeruleus
Published: 2019-11-04
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
In the plant-insect-insectivorous-bird system, changing climates can result in mis-timing in bird reproduction, potentially impacting chick survival. To adapt to earlier prey emergence, birds can make use of phenotypic plasticity, which can be characterized by reaction norms. Despite gaining focus in research, studies on avian reproductive reaction norms as traits are scarce, particularly on [...]
The Price equation and the unity of social evolution theory
Published: 2019-10-23
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
The Price equation has been entangled with social evolution theory from the start. It has been used to derive the most general versions of kin selection theory, and Price himself produced a multilevel equation which provides an alternative formulation of social evolution theory, dividing selection into components between and within groups. In this sense, the Price equation forms a basis for both [...]
The causes and consequences of ornament variation in a natural population
Published: 2019-10-13
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
The role of sexual selection in natural populations has long been the subject of debate in evolutionary biology. Ornaments are sexually selected traits, which means they should vary within a population, have a genetic basis, and be associated with fitness. Despite evidence of ornaments meeting these criteria, evolutionary responses to sexual selection are rare in nature. This study focuses on two [...]
Toward a metabolic theory of life history
Published: 2019-09-29
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences, Population Biology
Significance Data and theory reveal how organisms allocate metabolic energy to components of the life history that determine fitness. In each generation animals take up biomass energy from the environment and expended it on survival, growth, and reproduction. Life histories of animals exhibit enormous diversity – from large fish and invertebrates that produce literally millions of tiny eggs and [...]
Illustrating the importance of meta-analysing variances alongside means in ecology and evolution
Published: 2019-09-12
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
Meta-analysis is increasingly used in biology to both quantitatively summarize available evidence for specific questions, and generate new hypotheses. While this powerful tool has mostly been deployed to study mean effects, there is untapped potential to study effects on (trait) variance. Here, we use a recently published dataset as a case study to demonstrate how meta-analysis of variance can be [...]
Parental breeding age effects on descendants’ longevity interact over two generations in matrilines and patrilines
Published: 2019-08-02
Subjects: Ecology and Evolutionary Biology, Evolution, Life Sciences
Individuals within populations vary enormously in mortality risk and longevity, but the causes of this variation remain poorly understood. A potentially important and phylogenetically widespread source of such variation is maternal age at breeding, which typically has negative effects on offspring longevity. Here, we show that paternal age can affect offspring longevity as strongly as maternal [...]
Individual differences in behaviour explain variation in survival: a meta-analysis
Published: 2019-08-01
Subjects: Behavior and Ethology, Ecology and Evolutionary Biology, Evolution, Life Sciences
Research focusing on among-individual differences in behaviour (“animal personality”) has been blooming for over a decade. One of the central theories explaining the maintenance of behavioural variation posits a trade-off between behaviour and survival with individuals expressing greater “risky” behaviours suffering higher mortality. Here, for the first time, we synthesize the existing empirical [...]