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Biro PA, Garland T, Beckmann C, Ujvari B, Thomas F, Post JR. Metabolic Scope as a Proximate Constraint on Individual Behavioral Variation: Effects on Personality, Plasticity, and Predictability. Am Nat 2018; 192:142-154. [PMID: 30016170 DOI: 10.1086/697963] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Behavioral ecologists have hypothesized that among-individual differences in resting metabolic rate (RMR) may predict consistent individual differences in mean values for costly behaviors or for behaviors that affect energy intake rate. This hypothesis has empirical support and presently attracts considerable attention, but, notably, it does not provide predictions for individual differences in (a) behavioral plasticity or (b) unexplained variation (residual variation from mean individual behavior, here termed predictability). We outline how consideration of aerobic maximum metabolic rate (MMR) and particularly aerobic scope (= MMR - RMR) can be used to simultaneously make predictions about mean and among- and within-individual variation in behavior. We predict that while RMR should be proportional to an individual's mean level of sustained behavioral activity (one aspect of its personality), individuals with greater aerobic scope will also have greater scope to express behavioral plasticity and/or greater unpredictability in behavior (=greater residual variation). As a first step toward testing these predictions, we analyze existing activity data from selectively bred lines of mice that differ in both daily activity and aerobic scope. We find that replicate high-scope mice are more active on average and show greater among-individual variation in activity, greater among-individual variation in plasticity, and greater unpredictability. These data provide some tentative first support for our hypothesis, suggesting that further research on this topic would be valuable.
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Argasinski K, Broom M. Evolutionary stability under limited population growth: Eco-evolutionary feedbacks and replicator dynamics. ECOLOGICAL COMPLEXITY 2018. [DOI: 10.1016/j.ecocom.2017.04.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Argasinski K, Broom M. Interaction rates, vital rates, background fitness and replicator dynamics: how to embed evolutionary game structure into realistic population dynamics. Theory Biosci 2018; 137:33-50. [PMID: 29159683 PMCID: PMC5893772 DOI: 10.1007/s12064-017-0257-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 10/16/2017] [Indexed: 11/13/2022]
Abstract
In this paper we are concerned with how aggregated outcomes of individual behaviours, during interactions with other individuals (games) or with environmental factors, determine the vital rates constituting the growth rate of the population. This approach needs additional elements, namely the rates of event occurrence (interaction rates). Interaction rates describe the distribution of the interaction events in time, which seriously affects the population dynamics, as is shown in this paper. This leads to the model of a population of individuals playing different games, where focal game affected by the considered trait can be extracted from the general model, and the impact on the dynamics of other events (which is not neutral) can be described by an average background fertility and mortality. This leads to a distinction between two types of background fitness, strategically neutral elements of the focal games (correlated with the focal game events) and the aggregated outcomes of other interactions (independent of the focal game). The new approach is useful for clarification of the biological meaning of concepts such as weak selection. Results are illustrated by a Hawk-Dove example.
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Affiliation(s)
- K. Argasinski
- Institute of Mathematics of Polish Academy of Sciences, ul. Śniadeckich 8, 00-956 Warszawa 10, Poland
| | - M. Broom
- Department of Mathematics, City, University of London, Northampton Square, London, EC1V 0HB UK
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Kilgour RJ, McAdam AG, Betini GS, Norris DR. Experimental evidence that density mediates negative frequency-dependent selection on aggression. J Anim Ecol 2018; 87:1091-1101. [PMID: 29446094 DOI: 10.1111/1365-2656.12813] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 01/25/2018] [Indexed: 11/28/2022]
Abstract
Aggression can be beneficial in competitive environments if aggressive individuals are more likely to access resources than non-aggressive individuals. However, variation in aggressive behaviour persists within populations, suggesting that high levels of aggression might not always be favoured. The goal of this study was to experimentally assess the effects of population density and phenotypic frequency on selection on aggression in a competitive environment. We compared survival of two strains of Drosophila melanogaster that differ in aggression across three density treatments and five frequency treatments (single strain groups, equal numbers of each strain and strains mixed at 3:1 and 1:3 ratios) during a period of limited resources. While there was no difference in survival across single-strain treatments, survival was strongly density dependent, with declining survival as density increased. Furthermore, at medium and high densities, there was evidence of negative frequency-dependent selection, where rare strains experienced greater survival than common strains. However, there was no evidence of negative frequency-dependent selection at low density. Our results indicate that the benefits of aggression during periods of limited resources can depend on the interaction between the phenotypic composition of populations and population density, both of which are mechanisms that could maintain variation in aggressive behaviours within natural populations.
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Affiliation(s)
- R Julia Kilgour
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Andrew G McAdam
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - Gustavo S Betini
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
| | - D Ryan Norris
- Department of Integrative Biology, University of Guelph, Guelph, ON, Canada
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56
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Energetic trade-offs and feedbacks between behavior and metabolism influence correlations between pace-of-life attributes. Behav Ecol Sociobiol 2018. [DOI: 10.1007/s00265-018-2460-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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57
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Niemelä PT, Dingemanse NJ. Meta-analysis reveals weak associations between intrinsic state and personality. Proc Biol Sci 2018; 285:20172823. [PMID: 29491175 PMCID: PMC5832713 DOI: 10.1098/rspb.2017.2823] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 02/08/2018] [Indexed: 02/06/2023] Open
Abstract
Individual differences in behaviour characterize humans and animals alike. A hot field in behavioural ecology asks why this variation in 'personality' evolved. Theory posits that selection favours the integration of 'intrinsic state' and behaviour. Metabolism, hormones, energetic reserves and structural size have particularly been proposed as states covarying with behaviour among-individuals, either genetically or through plasticity integration. We conducted a meta-analysis estimating the amount of among-individual variation in behaviour attributable to variation in state. Our literature search showed that only 22% of the studies claiming to estimate individual-level associations between state and behaviour actually did so. Our meta-analysis revealed that relatively aggressive, bold, explorative and/or active individuals had relatively high metabolic rates, hormone levels, body weights and/or body sizes. The proportion of among-individual variation common to state and behaviour was nevertheless small (approx. 5%). This means that (i) adaptive explanations involving intrinsic states fail to explain much individual variation in behaviour, (ii) empiricists should consider nonlinear, additive or interactive effects of (multiple) intrinsic states, (iii) explanations not involving intrinsic states might be important, or (iv) empirical tests of state-dependent personality theory were inappropriate. Our meta-analysis highlights the importance of feedback between empiricists and theoreticians in the study of adaptive behavioural variation.
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Affiliation(s)
- Petri T Niemelä
- Behavioural Ecology, Department of Biology, Ludwig-Maximilians University of Munich, Planegg-Martinsried, Germany
| | - Niels J Dingemanse
- Behavioural Ecology, Department of Biology, Ludwig-Maximilians University of Munich, Planegg-Martinsried, Germany
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58
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59
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Dijkstra PD, Maguire SM, Harris RM, Rodriguez AA, DeAngelis RS, Flores SA, Hofmann HA. The melanocortin system regulates body pigmentation and social behaviour in a colour polymorphic cichlid fish. Proc Biol Sci 2018; 284:rspb.2016.2838. [PMID: 28356453 DOI: 10.1098/rspb.2016.2838] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 03/02/2017] [Indexed: 12/26/2022] Open
Abstract
The melanocortin system is a neuroendocrine system that regulates a range of physiological and behavioural processes. We examined the extent to which the melanocortin system simultaneously regulates colour and behaviour in the cichlid fish Astatotilapia burtoni We found that yellow males are more aggressive than blue males, in line with previous studies. We then found that exogenous α-melanocyte-stimulating hormone (α-MSH) increases yellowness of the body and dispersal of xanthophore pigments in both morphs. However, α-MSH had a morph-specific effect on aggression, with only blue males showing an increase in the rate of aggression. Exogenous agouti signalling peptide (ASIP), a melanocortin antagonist, did not affect coloration but reduced the rate of aggression in both colour morphs. Blue males had higher cortisol levels than yellow males. Neural gene expression of melanocortin receptors (mcr) and ligands was not differentially regulated between colour morphs. In the skin, however, mc1r and pro-opiomelanocortin (pomc) β were upregulated in blue males, while asip 1 was upregulated in yellow males. The effects of α-MSH on behaviour and body coloration, combined with morph-specific regulation of the stress response and the melanocortin system, suggest that the melanocortin system contributes to the polymorphism in behaviour and coloration in A. burtoni.
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Affiliation(s)
- Peter D Dijkstra
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA .,Behavioural Biology, Institute of Biology, Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands.,Department of Biology, Central Michigan University, Mount Pleasant, MI 48859, USA
| | - Sean M Maguire
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA
| | - Rayna M Harris
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA.,Institute for Cellular & Molecular Biology, The University of Texas at Austin, Austin, TX 78712, USA
| | - Agosto A Rodriguez
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA
| | - Ross S DeAngelis
- Program for Ecology, Evolution and Conservation Biology, Beckman Institute, University of Illinois at Urbana-Champaign, 405 N. Mathews Avenue, Urbana, IL 61801, USA
| | - Stephanie A Flores
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA
| | - Hans A Hofmann
- Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA.,Institute for Cellular & Molecular Biology, The University of Texas at Austin, Austin, TX 78712, USA.,Institute for Neuroscience, The University of Texas at Austin, Austin, TX 78712, USA
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60
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Consistently bolder turtles maintain higher body temperatures in the field but may experience greater predation risk. Behav Ecol Sociobiol 2017. [DOI: 10.1007/s00265-017-2428-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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61
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Hengartner MP. The Evolutionary Life History Model of Externalizing Personality: Bridging Human and Animal Personality Science to Connect Ultimate and Proximate Mechanisms Underlying Aggressive Dominance, Hostility, and Impulsive Sensation Seeking. REVIEW OF GENERAL PSYCHOLOGY 2017. [DOI: 10.1037/gpr0000127] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The present work proposes an evolutionary model of externalizing personality that defines variation in this broad psychobiological phenotype resulting from genetic influences and a conditional adaptation to high-risk environments with high extrinsic morbidity-mortality. Due to shared selection pressure, externalizing personality is coadapted to fast life history strategies and maximizes inclusive fitness under adverse environmental conditions by governing the major trade-offs between reproductive versus somatic functions, current versus future reproduction, and mating versus parenting efforts. According to this model, externalizing personality is a regulatory device at the interface between the individual and its environment that is mediated by 2 overlapping psychobiological systems, that is, the attachment and the stress-response system. The attachment system coordinates interpersonal behavior and intimacy in close relationships and the stress-response system regulates the responsivity to environmental challenge and both physiological and behavioral reactions to stress. These proximate mechanisms allow for the integration of neuroendocrinological processes underlying interindividual differences in externalizing personality. Hereinafter I further discuss the model's major implications for personality psychology, psychiatry, and public health policy.
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62
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Kendall BE, Fox GA, Stover JP. Boldness-aggression syndromes can reduce population density: behavior and demographic heterogeneity. Behav Ecol 2017. [DOI: 10.1093/beheco/arx068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Bruce E Kendall
- Bren School of Environmental Science & Management, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Gordon A Fox
- Department of Integrative Biology, University of South Florida, Tampa, FL, USA
| | - Joseph P Stover
- Department of Mathematics, Lyon College, Batesville, AR, USA
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63
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Thurfjell H, Ciuti S, Boyce MS. Learning from the mistakes of others: How female elk (Cervus elaphus) adjust behaviour with age to avoid hunters. PLoS One 2017; 12:e0178082. [PMID: 28614406 PMCID: PMC5470680 DOI: 10.1371/journal.pone.0178082] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 05/07/2017] [Indexed: 11/19/2022] Open
Abstract
In animal behaviour, there is a dichotomy between innate behaviours (e.g., temperament or personality traits) versus those behaviours shaped by learning. Innate personality traits are supposedly less evident in animals when confounded by learning acquired with experience through time. Learning might play a key role in the development and adoption of successful anti-predator strategies, and the related adaptation has the potential to make animals that are more experienced less vulnerable to predation. We carried out a study in a system involving a large herbivorous mammal, female elk, Cervus elaphus, and their primary predator, i.e., human hunters. Using fine-scale satellite telemetry relocations, we tested whether differences in behaviour depending on age were due solely to selection pressure imposed by human hunters, meaning that females that were more cautious were more likely to survive and become older. Or whether learning also was involved, meaning that females adjusted their behaviour as they aged. Our results indicated that both human selection and learning contributed to the adoption of more cautious behavioural strategies in older females. Whereas human selection of behavioural traits has been shown in our previous research, we here provide evidence of additive learning processes being responsible for shaping the behaviour of individuals in this population. Female elk are indeed almost invulnerable to human hunters when older than 9-10 y.o., confirming that experience contributes to their survival. Female elk monitored in our study showed individually changing behaviours and clear adaptation as they aged, such as reduced movement rates (decreased likelihood of encountering human hunters), and increased use of secure areas (forest and steeper terrain), especially when close to roads. We also found that elk adjusted behaviours depending on the type of threat (bow and arrow vs. rifle hunters). This fine-tuning by elk to avoid hunters, rather than just becoming more cautious during the hunting season, highlights the behavioural plasticity of this species. Selection on behavioural traits and/or behavioural shifts via learning are an important but often-ignored consequence of human exploitation of wild animals. Such information is a critical component of the effects of human exploitation of wildlife populations with implications for improving their management and conservation.
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Affiliation(s)
- Henrik Thurfjell
- Department of Biological Sciences, University of Alberta, Edmonton, Canada
- Swedish Species Information Centre, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Simone Ciuti
- Department of Biometry and Environmental System Analysis, University of Freiburg, Freiburg, Germany
| | - Mark S. Boyce
- Department of Biological Sciences, University of Alberta, Edmonton, Canada
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64
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Segev U, Burkert L, Feldmeyer B, Foitzik S. Pace-of-life in a social insect: behavioral syndromes in ants shift along a climatic gradient. Behav Ecol 2017. [DOI: 10.1093/beheco/arx079] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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65
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66
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Edwards HA, Burke T, Dugdale HL. Repeatable and heritable behavioural variation in a wild cooperative breeder. Behav Ecol 2017; 28:668-676. [PMID: 29622921 PMCID: PMC5873258 DOI: 10.1093/beheco/arx013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 01/10/2017] [Accepted: 01/17/2017] [Indexed: 11/18/2022] Open
Abstract
Quantifying consistent differences in behaviour among individuals is vital to understanding the ecological and evolutionary significance of animal personality. To quantify personality, the phenotypic variation of a behavioural trait is partitioned to assess how it varies among individuals, which is also known as repeatability. If pedigree data are available, the phenotypic variation can then be further partitioned to estimate the additive genetic variance and heritability. Assessing the repeatability and heritability of personality traits therefore allows for a better understanding of what natural selection can act upon, enabling evolution. In a natural population of facultative cooperatively breeding Seychelles warbler (Acrocephalus sechellensis) on Cousin Island, a lack of breeding vacancies forces individuals into different life-history strategies, and these differences in reproductive state could generate behavioural differences among individuals in the population. We used this population to estimate the repeatability of 4 behavioural traits (novel environment exploration, novel object exploration, obstinacy/struggle rate, and escape response), and narrow-sense heritability (of behavior, h2B; behavior minus observer variance; and personality), and evolvability, of the repeatable behavioural traits. We also tested for an among-individual correlation between the repeatable traits. We found that, compared to estimates in other study species, the exploratory behaviours were moderately repeatable (0.23–0.37), there was a positive among-individual correlation (0.51) between novel environment and novel object exploration, and that novel environment exploration was moderately heritable (0.17; h2B was low as it includes observer variance). This study further clarifies the additive genetic variance available for selection to act upon in this cooperatively breeding bird.
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Affiliation(s)
- Hannah A Edwards
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - Terry Burke
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - Hannah L Dugdale
- Nature Seychelles, PO Box 1310, Roche Caiman, Mahé, Republic of Seychelles.,Behavioural Ecology and Physiological Group, Groningen Institute for Evolutionary Life Sciences, University of Groningen, PO Box 11103, 9700 CC, Groningen, The Netherlands.,School of Biology, The Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
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67
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Montiglio PO, Wey TW, Chang AT, Fogarty S, Sih A. Correlational selection on personality and social plasticity: morphology and social context determine behavioural effects on mating success. J Anim Ecol 2017; 86:213-226. [PMID: 27859289 DOI: 10.1111/1365-2656.12610] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Accepted: 11/03/2016] [Indexed: 11/28/2022]
Abstract
Despite a central line of research aimed at quantifying relationships between mating success and sexually dimorphic traits (e.g., ornaments), individual variation in sexually selected traits often explains only a modest portion of the variation in mating success. Another line of research suggests that a significant portion of the variation in mating success observed in animal populations could be explained by correlational selection, where the fitness advantage of a given trait depends on other components of an individual's phenotype and/or its environment. We tested the hypothesis that interactions between multiple traits within an individual (phenotype dependence) or between an individual's phenotype and its social environment (context dependence) can select for individual differences in behaviour (i.e., personality) and social plasticity. To quantify the importance of phenotype- and context-dependent selection on mating success, we repeatedly measured the behaviour, social environment and mating success of about 300 male stream water striders, Aquarius remigis. Rather than explaining individual differences in long-term mating success, we instead quantified how the combination of a male's phenotype interacted with the immediate social context to explain variation in hour-by-hour mating decisions. We suggest that this analysis captures more of the mechanisms leading to differences in mating success. Males differed consistently in activity, aggressiveness and social plasticity. The mating advantage of these behavioural traits depended on male morphology and varied with the number of rival males in the pool, suggesting mechanisms selecting for consistent differences in behaviour and social plasticity. Accounting for phenotype and context dependence improved the amount of variation in male mating success we explained statistically by 30-274%. Our analysis of the determinants of male mating success provides important insights into the evolutionary forces that shape phenotypic variation. In particular, our results suggest that sexual selection is likely to favour individual differences in behaviour, social plasticity (i.e., individuals adjusting their behaviour), niche preference (i.e., individuals dispersing to particular social conditions) or social niche construction (i.e., individuals modifying the social environment). The true effect of sexual traits can only be understood in interaction with the individual's phenotype and environment.
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Affiliation(s)
- Pierre-Olivier Montiglio
- Department of Environmental Sciences & Policy, University of California at Davis, One Shields Avenue, Davis, CA, 95616, USA.,Department of Biology & Redpath Museum, McGill University, 1205 Dr-Penfield Avenue, Montreal, QC, H3A 1B1, Canada
| | - Tina W Wey
- Department of Environmental Sciences & Policy, University of California at Davis, One Shields Avenue, Davis, CA, 95616, USA.,Département des Sciences Biologiques, Université du Québec à Montréal, 141 Avenue du Président-Kennedy, Montreal, QC, H2X 1Y4, Canada
| | - Ann T Chang
- Department of Environmental Sciences & Policy, University of California at Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Sean Fogarty
- Department of Environmental Sciences & Policy, University of California at Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Andrew Sih
- Department of Environmental Sciences & Policy, University of California at Davis, One Shields Avenue, Davis, CA, 95616, USA
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68
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Arnqvist G, Novičić ZK, Castro JA, Sayadi A. Negative frequency dependent selection on sympatric mtDNA haplotypes in Drosophila subobscura. Hereditas 2016; 153:15. [PMID: 28096777 PMCID: PMC5226107 DOI: 10.1186/s41065-016-0020-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 11/11/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Recent experimental evidence for selection on mitochondrial DNA (mtDNA) has prompted the question as to what processes act to maintain within-population variation in mtDNA. Balancing selection though negative frequency dependent selection (NFDS) among sympatric haplotypes is a possibility, but direct empirical evidence for this is very scarce. FINDINGS We extend the previous findings of a multi-generation replicated cage experiment in Drosophila subobscura, where mtDNA polymorphism was maintained in a laboratory setting. First, we use a set of Monte Carlo simulations to show that the haplotype frequency dynamics observed are inconsistent with genetic drift alone and most closely match those expected under NFDS. Second, we show that haplotype frequency changes over time were significantly different from those expected under either genetic drift or positive selection but were consistent with those expected under NFSD. CONCLUSIONS Collectively, our analyses provide novel support for NFDS on mtDNA haplotypes, suggesting that mtDNA polymorphism may at least in part be maintained by balancing selection also in natural populations. We very briefly discuss the possible mechanisms that might be involved.
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Affiliation(s)
- Göran Arnqvist
- Department of Ecology and Genetics, Animal Ecology, University of Uppsala, Norbyv 18D, SE75236 Uppsala, Sweden
| | - Zorana Kurbalija Novičić
- Department of Ecology and Genetics, Animal Ecology, University of Uppsala, Norbyv 18D, SE75236 Uppsala, Sweden ; Institute for Biological Research "Siniša Stanković", University of Belgrade, Despot Stefan Blvd 142, 11000 Belgrade, Serbia
| | - José A Castro
- Laboratori de Genètica, Departament de Biologia, Facultat de Ciencies, Edifici Guillem Colom, Universitat de les Illes Balears, Campus de la UIB, Palma de Mallorca, Balears 07122 Spain
| | - Ahmed Sayadi
- Department of Ecology and Genetics, Animal Ecology, University of Uppsala, Norbyv 18D, SE75236 Uppsala, Sweden
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69
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Holtmann B, Lagisz M, Nakagawa S. Metabolic rates, and not hormone levels, are a likely mediator of between‐individual differences in behaviour: a meta‐analysis. Funct Ecol 2016. [DOI: 10.1111/1365-2435.12779] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Benedikt Holtmann
- Department of Zoology University of Otago 340 Great King Street Dunedin 9016 New Zealand
| | - Malgorzata Lagisz
- Department of Zoology University of Otago 340 Great King Street Dunedin 9016 New Zealand
- Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences University of New South Wales Sydney New South Wales 2052 Australia
| | - Shinichi Nakagawa
- Department of Zoology University of Otago 340 Great King Street Dunedin 9016 New Zealand
- Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences University of New South Wales Sydney New South Wales 2052 Australia
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70
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Näslund J, Johnsson JI. State-dependent behavior and alternative behavioral strategies in brown trout ( Salmo trutta L.) fry. Behav Ecol Sociobiol 2016; 70:2111-2125. [PMID: 27881895 PMCID: PMC5102978 DOI: 10.1007/s00265-016-2215-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 09/05/2016] [Accepted: 09/06/2016] [Indexed: 10/28/2022]
Abstract
ABSTRACT Animals generally adjust their behavior in response to bodily state (e.g., size and energy reserves) to optimize energy intake in relation to mortality risk, weighing predation probability against the risk of starvation. Here, we investigated whether brown trout Salmo trutta adjust their behavior in relation to energetic status and body size during a major early-life selection bottleneck, when fast growth is important. Over two consecutive time periods (P1 and P2; 12 and 23 days, respectively), food availability was manipulated, using four different combinations of high (H) and low (L) rations (i.e., HH, HL, LH, and LL; first and second letter denoting ration during P1 and P2, respectively). Social effects were excluded through individual isolation. Following the treatment periods, fish in the HL treatment were on average 15-21 % more active than the other groups in a forced open-field test, but large within-treatment variation provided only weak statistical support for this effect. Furthermore, fish on L-ration during P2 tended to be more actively aggressive towards their mirror image than fish on H-ration. Body size was related to behavioral expression, with larger fish being more active and aggressive. Swimming activity and active aggression were positively correlated, forming a behavioral syndrome in the studied population. Based on these behavioral traits, we could also distinguish two behavioral clusters: one consisting of more active and aggressive individuals and the other consisting of less active and aggressive individuals. This indicates that brown trout fry adopt distinct behavioral strategies early in life. SIGNIFICANCE STATEMENT This paper provides information on the state-dependence of behavior in animals, in particular young brown trout. On the one hand, our data suggest a weak energetic state feedback where activity and aggression is increased as a response to short term food restriction. This suggests a limited scope for behavioral alterations in the face of starvation. On the other hand, body size is linked to higher activity and aggression, likely as a positive feedback between size and dominance. The experiment was carried out during the main population survival bottleneck, and the results indicate that growth is important during this stage, as 1) behavioral compensation to increase growth is limited, and 2) growth likely increases the competitive ability. However, our data also suggests that the population separates into two clusters, based on combined scores of activity and aggression (which are positively linked within individuals). Thus, apart from an active and aggressive strategy, there seems to be another more passive behavioral strategy.
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Affiliation(s)
- Joacim Näslund
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 463, 405 30 Gothenburg, Sweden
| | - Jörgen I. Johnsson
- Department of Biological and Environmental Sciences, University of Gothenburg, Box 463, 405 30 Gothenburg, Sweden
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Blight O, Villalta I, Cerdá X, Boulay R. Personality traits are associated with colony productivity in the gypsy ant Aphaenogaster senilis. Behav Ecol Sociobiol 2016. [DOI: 10.1007/s00265-016-2224-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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72
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Emergence and development of personality over the ontogeny of fish in absence of environmental stress factors. Behav Ecol Sociobiol 2016. [DOI: 10.1007/s00265-016-2206-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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73
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Berg V, Lummaa V, Rickard IJ, Silventoinen K, Kaprio J, Jokela M. Genetic Associations Between Personality Traits and Lifetime Reproductive Success in Humans. Behav Genet 2016; 46:742-753. [DOI: 10.1007/s10519-016-9803-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 07/27/2016] [Indexed: 02/01/2023]
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74
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Taub DR, Page J. Molecular Signatures of Natural Selection for Polymorphic Genes of the Human Dopaminergic and Serotonergic Systems: A Review. Front Psychol 2016; 7:857. [PMID: 27375535 PMCID: PMC4896960 DOI: 10.3389/fpsyg.2016.00857] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 05/24/2016] [Indexed: 12/21/2022] Open
Abstract
A large body of research has examined the behavioral and mental health consequences of polymorphisms in genes of the dopaminergic and serotonergic systems. Along with this, there has been considerable interest in the possibility that these polymorphisms have developed and/or been maintained due to the action of natural selection. Episodes of natural selection on a gene are expected to leave molecular “footprints” in the DNA sequences of the gene and adjacent genomic regions. Here we review the research literature investigating molecular signals of selection for genes of the dopaminergic and serotonergic systems. The gene SLC6A4, which codes for a serotonin transport protein, was the one gene for which there was consistent support from multiple studies for a selective episode. Positive selection on SLC6A4 appears to have been initiated ∼ 20–25,000 years ago in east Asia and possibly in Europe. There are scattered reports of molecular signals of selection for other neurotransmitter genes, but these have generally failed at replication across studies. In spite of speculation in the literature about selection on these genes, current evidence from population genomic analyses supports selectively neutral processes, such as genetic drift and population dynamics, as the principal drivers of recent evolution in dopaminergic and serotonergic genes other than SLC6A4.
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Affiliation(s)
- Daniel R Taub
- Department of Biology, Southwestern University, Georgetown TX, USA
| | - Joshua Page
- Department of Biology, Southwestern University, GeorgetownTX, USA; School of Medicine, Washington University, St LouisMO, USA
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75
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76
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Mell H, Josserand R, Decencière B, Artacho P, Meylan S, Le Galliard JF. Do personalities co-vary with metabolic expenditure and glucocorticoid stress response in adult lizards? Behav Ecol Sociobiol 2016. [DOI: 10.1007/s00265-016-2117-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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77
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Hagen EH, Rosenström T. Explaining the sex difference in depression with a unified bargaining model of anger and depression. Evol Med Public Health 2016; 2016:117-32. [PMID: 26884416 PMCID: PMC4804352 DOI: 10.1093/emph/eow006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 02/03/2016] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Women are twice as likely as men to be depressed, a bias that is poorly understood. One evolutionary model proposes that depression is a bargaining strategy to compel reluctant social partners to provide more help in the wake of adversity. An evolutionary model of anger proposes that high upper body strength predisposes individuals to angrily threaten social partners who offer too few benefits or impose too many costs. Here, we propose that when social partners provide too few benefits or impose too many costs, the physically strong become overtly angry and the physically weak become depressed. The sexual dimorphism in upper body strength means that men will be more likely to bargain with anger and physical threats and women with depression. METHODOLOGY We tested this idea using the 2011-12 National Health and Nutrition Examination Survey (NHANES), a large nationally representative sample of US households that included measures of depression and upper body strength. RESULTS A 2 SD increase in grip strength decreased the odds of depression by more than half ([Formula: see text],[Formula: see text]), which did not appear to be a consequence of confounds with anthropometric, hormonal or socioeconomic variables, but was partially explained by a confound with physical disability. Nevertheless, upper body strength mediated 63% of the effect of sex on depression, but the mediation effect was unexpectedly moderated by age. CONCLUSIONS Low upper body strength is a risk factor for depression, especially in older adults, and the sex difference in body strength appears to explain much of the perplexing sex difference in depression.
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Affiliation(s)
- Edward H Hagen
- Department of Anthropology, Washington State University, 14204 NE Salmon Creek Avenue, Vancouver, WA 98686, USA
| | - Tom Rosenström
- Institute of Behavioural Sciences, University of Helsinki, Helsinki 00014 (PO Box 9), Finland
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78
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Brown AL, Robinson BW. Variation in behavioural plasticity regulates consistent individual differences in Enallagma damselfly larvae. Anim Behav 2016. [DOI: 10.1016/j.anbehav.2015.11.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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79
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David M, Dall SRX. Unravelling the Philosophies Underlying ‘Animal Personality’ Studies: A Brief Re-Appraisal of the Field. Ethology 2015. [DOI: 10.1111/eth.12445] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Morgan David
- Department of Biology-Ethology; University of Antwerp; Wilrijk Belgium
- Centre for Ecology & Conservation; School of Biosciences; College of Life & Environmental Sciences; University of Exeter; Cornwall UK
| | - Sasha R. X. Dall
- Centre for Ecology & Conservation; School of Biosciences; College of Life & Environmental Sciences; University of Exeter; Cornwall UK
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80
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McNamara JM, Wolf M. Sexual conflict over parental care promotes the evolution of sex differences in care and the ability to care. Proc Biol Sci 2015; 282:20142752. [PMID: 25694618 DOI: 10.1098/rspb.2014.2752] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Strong asymmetries in parental care, with one sex providing more care than the other, are widespread across the animal kingdom. At present, two factors are thought to ultimately cause sex differences in care: certainty of parentage and sexual selection. By contrast, we here show that the coevolution of care and the ability to care can result in strong asymmetries in both the ability to care and the level of care, even in the absence of these factors. While the coevolution of care and the ability to care does not predict which sex evolves to care more than the other, once other factors give rise to even the slightest differences in the cost and benefits of care between the sexes (e.g. differences in certainty in parentage), a clear directionality emerges; the sex with the lower cost or higher benefit of care evolves both to be more able to care and to provide much higher levels of care than the other sex. Our findings suggest that the coevolution of levels of care and the ability to care may be a key factor underlying the evolution of sex differences in care.
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Affiliation(s)
- John M McNamara
- School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, UK
| | - Max Wolf
- Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, Berlin 12587, Germany
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81
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Edwards HA, Hajduk GK, Durieux G, Burke T, Dugdale HL. No Association between Personality and Candidate Gene Polymorphisms in a Wild Bird Population. PLoS One 2015; 10:e0138439. [PMID: 26473495 PMCID: PMC4608812 DOI: 10.1371/journal.pone.0138439] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 08/31/2015] [Indexed: 02/06/2023] Open
Abstract
Consistency of between-individual differences in behaviour or personality is a phenomenon in populations that can have ecological consequences and evolutionary potential. One way that behaviour can evolve is to have a genetic basis. Identifying the molecular genetic basis of personality could therefore provide insight into how and why such variation is maintained, particularly in natural populations. Previously identified candidate genes for personality in birds include the dopamine receptor D4 (DRD4), and serotonin transporter (SERT). Studies of wild bird populations have shown that exploratory and bold behaviours are associated with polymorphisms in both DRD4 and SERT. Here we tested for polymorphisms in DRD4 and SERT in the Seychelles warbler (Acrocephalus sechellensis) population on Cousin Island, Seychelles, and then investigated correlations between personality and polymorphisms in these genes. We found no genetic variation in DRD4, but identified four polymorphisms in SERT that clustered into five haplotypes. There was no correlation between bold or exploratory behaviours and SERT polymorphisms/haplotypes. The null result was not due to lack of power, and indicates that there was no association between these behaviours and variation in the candidate genes tested in this population. These null findings provide important data to facilitate representative future meta-analyses on candidate personality genes.
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Affiliation(s)
- Hannah A. Edwards
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
- * E-mail:
| | - Gabriela K. Hajduk
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Gillian Durieux
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Terry Burke
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
| | - Hannah L. Dugdale
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
- Nature Seychelles, Mahe, Republic of Seychelles
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82
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Løvlie H, Immonen E, Gustavsson E, Kazancioğlu E, Arnqvist G. The influence of mitonuclear genetic variation on personality in seed beetles. Proc Biol Sci 2015; 281:20141039. [PMID: 25320161 PMCID: PMC4213632 DOI: 10.1098/rspb.2014.1039] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
There is a growing awareness of the influence of mitochondrial genetic variation on life-history phenotypes, particularly via epistatic interactions with nuclear genes. Owing to their direct effect on traits such as metabolic and growth rates, mitonuclear interactions may also affect variation in behavioural types or personalities (i.e. behavioural variation that is consistent within individuals, but differs among individuals). However, this possibility is largely unexplored. We used mitonuclear introgression lines, where three mitochondrial genomes were introgressed into three nuclear genetic backgrounds, to disentangle genetic effects on behavioural variation in a seed beetle. We found within-individual consistency in a suite of activity-related behaviours, providing evidence for variation in personality. Composite measures of overall activity of individuals in behavioural assays were influenced by both nuclear genetic variation and by the interaction between nuclear and mitochondrial genomes. More importantly, the degree of expression of behavioural and life-history phenotypes was correlated and mitonuclear genetic variation affected expression of these concerted phenotypes. These results show that mitonuclear genetic variation affects both behavioural and life-history traits, and they provide novel insights into the maintenance of genetic variation in behaviour and personality.
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Affiliation(s)
- Hanne Løvlie
- Animal Ecology, Department of Ecology and Genetics, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden
| | - Elina Immonen
- Animal Ecology, Department of Ecology and Genetics, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden
| | - Emil Gustavsson
- Animal Ecology, Department of Ecology and Genetics, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden
| | - Erem Kazancioğlu
- Animal Ecology, Department of Ecology and Genetics, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden
| | - Göran Arnqvist
- Animal Ecology, Department of Ecology and Genetics, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden
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83
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Mathot KJ, Dingemanse NJ. Energetics and behavior: unrequited needs and new directions. Trends Ecol Evol 2015; 30:199-206. [DOI: 10.1016/j.tree.2015.01.010] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 01/19/2015] [Accepted: 01/21/2015] [Indexed: 10/24/2022]
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84
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Dingemanse NJ, Araya-Ajoy YG. Interacting personalities: behavioural ecology meets quantitative genetics. Trends Ecol Evol 2015; 30:88-97. [DOI: 10.1016/j.tree.2014.12.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 11/28/2014] [Accepted: 12/03/2014] [Indexed: 12/24/2022]
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85
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Kurbalija Novičić Z, Immonen E, Jelić M, AnÐelković M, Stamenković-Radak M, Arnqvist G. Within-population genetic effects of mtDNA on metabolic rate in Drosophila subobscura. J Evol Biol 2015; 28:338-46. [PMID: 25454557 DOI: 10.1111/jeb.12565] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 11/25/2014] [Accepted: 11/26/2014] [Indexed: 12/22/2022]
Abstract
A growing body of research supports the view that within-species sequence variation in the mitochondrial genome (mtDNA) is functional, in the sense that it has important phenotypic effects. However, most of this empirical foundation is based on comparisons across populations, and few studies have addressed the functional significance of mtDNA polymorphism within populations. Here, using mitonuclear introgression lines, we assess differences in whole-organism metabolic rate of adult Drosophila subobscura fruit flies carrying either of three different sympatric mtDNA haplotypes. We document sizeable, up to 20%, differences in metabolic rate across these mtDNA haplotypes. Further, these mtDNA effects are to some extent sex specific. We found no significant nuclear or mitonuclear genetic effects on metabolic rate, consistent with a low degree of linkage disequilibrium between mitochondrial and nuclear genes within populations. The fact that mtDNA haplotype variation within a natural population affects metabolic rate, which is a key physiological trait with important effects on life-history traits, adds weight to the emergent view that mtDNA haplotype variation is under natural selection and it revitalizes the question as to what processes act to maintain functional mtDNA polymorphism within populations.
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86
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Animal personality and state-behaviour feedbacks: a review and guide for empiricists. Trends Ecol Evol 2014; 30:50-60. [PMID: 25498413 DOI: 10.1016/j.tree.2014.11.004] [Citation(s) in RCA: 349] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 11/10/2014] [Accepted: 11/12/2014] [Indexed: 01/22/2023]
Abstract
An exciting area in behavioural ecology focuses on understanding why animals exhibit consistent among-individual differences in behaviour (animal personalities). Animal personality has been proposed to emerge as an adaptation to individual differences in state variables, leading to the question of why individuals differ consistently in state. Recent theory emphasizes the role that positive feedbacks between state and behaviour can play in producing consistent among-individual covariance between state and behaviour, hence state-dependent personality. We review the role of feedbacks in recent models of adaptive personalities, and provide guidelines for empirical testing of model assumptions and predictions. We discuss the importance of the mediating effects of ecology on these feedbacks, and provide a roadmap for including state-behaviour feedbacks in behavioural ecology research.
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87
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Mathot KJ, Nicolaus M, Araya‐Ajoy YG, Dingemanse NJ, Kempenaers B. Does metabolic rate predict risk‐taking behaviour? A field experiment in a wild passerine bird. Funct Ecol 2014. [DOI: 10.1111/1365-2435.12318] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kimberley J. Mathot
- Evolutionary Ecology of Variation Group Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
| | - Marion Nicolaus
- Evolutionary Ecology of Variation Group Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
| | - Yimen G. Araya‐Ajoy
- Evolutionary Ecology of Variation Group Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
| | - Niels J. Dingemanse
- Evolutionary Ecology of Variation Group Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
- Behavioural Ecology Department Biology II Ludwig‐Maximilians University of Munich Groβhadener Straβe 2 DE‐ 82152 Planegg‐Martinsried Munich Germany
| | - Bart Kempenaers
- Department of Behavioural Ecology and Evolutionary Genetics Max Planck Institute for Ornithology Eberhard Gwinner Straβe DE‐82319 Seewiesen Germany
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88
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Dubois F, Giraldeau LA. How the cascading effects of a single behavioral trait can generate personality. Ecol Evol 2014; 4:3038-45. [PMID: 25247061 PMCID: PMC4161177 DOI: 10.1002/ece3.1157] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 06/03/2014] [Accepted: 06/14/2014] [Indexed: 11/09/2022] Open
Abstract
Individuals from the same population generally vary in suites of correlated behavioral traits: personality. Yet, the strength of the behavioral correlations sometimes differs among populations and environmental conditions, suggesting that single underlying mechanisms, such as genetic constraints, cannot account for them. We propose, instead, that such suites of correlated traits may arise when a single key behavior has multiple cascading effects on several other behaviors through affecting the range of options available. For instance, an individual's shyness can constrain its habitat choice, which, in turn, could restrict the expression of other behavioral traits. We hypothesize that shy individuals should be especially restrained in their choice of habitat when the risk of predation is high, which then canalizes them into different behavioral options making them appear behaviorally distinct from bolder individuals. We test this idea using an individual-based simulation model. Our results show that individual differences in boldness can be sufficient, under high predation pressure, to generate behavioral correlations between boldness and both the tendency to aggregate and the propensity to use social information. Thus, our findings support the idea that some behavioral syndromes can be, at least to some extent, labile. Our model further predicts that such cascading effects should be more pronounced in populations with a long history of predation, which are expected to exhibit a low average boldness level, compared with predator-naïve populations.
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Affiliation(s)
- Frédérique Dubois
- Département de Sciences Biologiques, Université de Montréal Montréal, Quebec, Canada
| | - Luc-Alain Giraldeau
- Département des Sciences Biologiques, Université du Québec à Montréal Montréal, Quebec, Canada
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89
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90
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91
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Bijleveld AI, Massourakis G, van der Marel A, Dekinga A, Spaans B, van Gils JA, Piersma T. Personality drives physiological adjustments and is not related to survival. Proc Biol Sci 2014; 281:20133135. [PMID: 24671971 PMCID: PMC3996601 DOI: 10.1098/rspb.2013.3135] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The evolutionary function and maintenance of variation in animal personality is still under debate. Variation in the size of metabolic organs has recently been suggested to cause and maintain variation in personality. Here, we examine two main underlying notions: (i) that organ sizes vary consistently between individuals and cause consistent behavioural patterns, and (ii) that a more exploratory personality is associated with reduced survival. Exploratory behaviour of captive red knots (Calidris canutus, a migrant shorebird) was negatively rather than positively correlated with digestive organ (gizzard) mass, as well as with body mass. In an experiment, we reciprocally reduced and increased individual gizzard masses and found that exploration scores were unaffected. Whether or not these birds were resighted locally over the 19 months after release was negatively correlated with their exploration scores. Moreover, a long-term mark-recapture effort on free-living red knots with known gizzard masses at capture confirmed that local resighting probability (an inverse measure of exploratory behaviour) was correlated with gizzard mass without detrimental effects on survival. We conclude that personality drives physiological adjustments, rather than the other way around, and suggest that physiological adjustments mitigate the survival costs of exploratory behaviour. Our results show that we need to reconsider hypotheses explaining personality variation based on organ sizes and differential survival.
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Affiliation(s)
- Allert I Bijleveld
- Department of Marine Ecology, NIOZ Royal Netherlands Institute for Sea Research, , 1790 AB Den Burg, The Netherlands, Animal Ecology Group, Centre for Ecological and Evolutionary Studies, University of Groningen, , PO Box 11103, 9700 CC Groningen, The Netherlands
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92
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Han CS, Brooks RC. Long-Term Effect of Social Interactions on Behavioral Plasticity and Lifetime Mating Success. Am Nat 2014; 183:431-44. [DOI: 10.1086/674935] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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93
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McGhee KE, Pintor LM, Bell AM. Reciprocal behavioral plasticity and behavioral types during predator-prey interactions. Am Nat 2013; 182:704-17. [PMID: 24231533 DOI: 10.1086/673526] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
How predators and prey interact has important consequences for population dynamics and community stability. Here we explored how predator-prey interactions are simultaneously affected by reciprocal behavioral plasticity (i.e., plasticity in prey defenses countered by plasticity in predator offenses and vice versa) and consistent individual behavioral variation (i.e., behavioral types) within both predator and prey populations. We assessed the behavior of a predator species (northern pike) and a prey species (three-spined stickleback) during one-on-one encounters. We also measured additional behavioral and morphological traits in each species. Using structural equation modeling, we found that reciprocal behavioral plasticity as well as predator and prey behavioral types influenced how individuals behaved during an interaction. Thus, the progression and ultimate outcome of predator-prey interactions depend on both the dynamic behavioral feedback occurring during the encounter and the underlying behavioral type of each participant. We also examined whether predator behavioral type is underlain by differences in metabolism and organ size. We provide some of the first evidence that behavioral type is related to resting metabolic rate and size of a sensory organ (the eyes). Understanding the extent to which reciprocal behavioral plasticity and intraspecific behavioral variation influence the outcome of species interactions could provide insight into the maintenance of behavioral variation as well as community dynamics.
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Affiliation(s)
- Katie E McGhee
- School of Integrative Biology, University of Illinois, Urbana, Illinois 61801
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94
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Mathot KJ, Dall SRX. Metabolic rates can drive individual differences in information and insurance use under the risk of starvation. Am Nat 2013; 182:611-20. [PMID: 24107368 DOI: 10.1086/673300] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Variation in how individuals invest in acquiring information (sampling) and in insuring themselves against potential negative consequences of uncertainty (e.g., by storing energy reserves) has been suggested to underlie consistent individual differences in suites of behavioral traits. However, the key drivers of individual differences in information use remain poorly understood. We use dynamic programming to explore how existing variation in metabolic rates (MRs) affects the use of sampling and insurance under starvation risk. Our analysis reveals nonlinear effects of MRs on diurnal patterns of sampling and insurance. Individuals with low MRs accrue reserves quickly, because they invest in sampling and are able to exploit profitable options when they arise. Individuals with intermediate MRs initially lose reserves, because sampling, while optimal, is relatively expensive; however, they later build reserves due to efficient exploitation of alternative foraging options. Sampling rarely pays for individuals with the highest MRs, which show relatively constant levels of energy reserves throughout the foraging period. Thus, individual variation in MRs on the scale observed in natural populations can lead to important differences in investment in sampling and insurance and may underpin consistent individual differences in suites of other behavioral traits, including individual differences in behavioral responsiveness.
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Affiliation(s)
- Kimberley J Mathot
- Evolutionary Ecology of Variation Group, Max Planck Institute for Ornithology, Eberhard-Gwinner-Strasse Haus 7, 82319 Seewiesen, Germany
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95
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Abstract
Most examples of the application of evolutionary game theory to problems in biology involve highly simplified models. I contend that it is time to move on and include much more richness in models. In particular, more thought needs to be given to the importance of (i) between-individual variation; (ii) the interaction between individuals, and hence the process by which decisions are reached; (iii) the ecological and life-history context of the situation; (iv) the traits that are under selection, and (v) the underlying psychological mechanisms that lead to behaviour. I give examples where including variation between individuals fundamentally changes predicted outcomes of a game. Variation also selects for real-time responses, again resulting in changed outcomes. Variation can select for other traits, such as choosiness and social sensitivity. More generally, many problems involve coevolution of more than one trait. I identify situations where a reductionist approach, in which a game is isolated from is ecological setting, can be misleading. I also highlight the need to consider flexibility of behaviour, mental states and other issues concerned with the evolution of mechanism.
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Affiliation(s)
- John M McNamara
- School of Mathematics, University of Bristol, Bristol BS8 1TW, UK.
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96
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Turbill C, Ruf T, Rothmann A, Arnold W. Social dominance is associated with individual differences in heart rate and energetic response to food restriction in female red deer. Physiol Biochem Zool 2013; 86:528-37. [PMID: 23995483 DOI: 10.1086/672372] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Energy expenditure is a key mechanism underlying animal ecology, yet why individuals often differ in metabolic rate even under identical conditions remains largely unexplained. Individual variation in metabolism might be explained by correlations with other behavioral and physiological traits, with individual syndromes having environment- or state-dependent costs and benefits to fitness. We tested whether social rank within herds of female red deer is associated with individual differences in resting heart rate, an index of metabolic rate, and energetic response to monthly periods of food restriction during winter in a large outdoor enclosure near Vienna, Austria. Social rank had a strong positive effect on average daily heart rate, independent of the effects of food intake, air temperature, body temperature, and body mass. Subordinate individuals had lower heart rates than dominants, and consequently they suffered lower rates of body mass loss during periods of restricted pellet food supply. A greater capacity to minimize energy requirements might benefit the survival of subdominant female red deer during periods of negative energy balance in winter. Our study provides empirical support in a large mammal for linkages in behavior and metabolism within individuals that have environment-dependent consequences to the energy budget.
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Affiliation(s)
- Christopher Turbill
- Research Institute for Wildlife Ecology, Department of Integrative Biology and Evolution, University of Veterinary Medicine Vienna, Vienna, Austria.
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Basal metabolic rate can evolve independently of morphological and behavioural traits. Heredity (Edinb) 2013; 111:175-81. [PMID: 23632896 DOI: 10.1038/hdy.2013.35] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 03/05/2013] [Accepted: 03/08/2013] [Indexed: 11/08/2022] Open
Abstract
Quantitative genetic analyses of basal metabolic rate (BMR) can inform us about the evolvability of the trait by providing estimates of heritability, and also of genetic correlations with other traits that may constrain the ability of BMR to respond to selection. Here, we studied a captive population of zebra finches (Taeniopygia guttata) in which selection lines for male courtship rate have been established. We measure BMR in these lines to see whether selection on male sexual activity would change BMR as a potentially correlated trait. We find that the genetic correlation between courtship rate and BMR is practically zero, indicating that the two traits can evolve independently of each other. Interestingly, we find that the heritability of BMR in our population (h(2)=0.45) is markedly higher than was previously reported for a captive zebra finch population from Norway. A comparison of the two studies shows that additive genetic variance in BMR has been largely depleted in the Norwegian population, especially the genetic variance in BMR that is independent of body mass. In our population, the slope of BMR increase with body mass differs not only between the sexes but also between the six selection lines, which we tentatively attribute to genetic drift and/or founder effects being strong in small populations. Our study therefore highlights two things. First, the evolvability of BMR may be less constrained by genetic correlations and lack of independent genetic variation than previously described. Second, genetic drift in small populations can rapidly lead to different evolvabilities across populations.
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Dingemanse NJ, Wolf M. Between-individual differences in behavioural plasticity within populations: causes and consequences. Anim Behav 2013. [DOI: 10.1016/j.anbehav.2012.12.032] [Citation(s) in RCA: 157] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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