1
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de Groot C, Wijnhorst RE, Ratz T, Murray M, Araya-Ajoy YG, Wright J, Dingemanse NJ. The importance of distinguishing individual differences in 'social impact' versus 'social responsiveness' when quantifying indirect genetic effects on the evolution of social plasticity. Neurosci Biobehav Rev 2023; 144:104996. [PMID: 36526032 DOI: 10.1016/j.neubiorev.2022.104996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 12/05/2022] [Accepted: 12/08/2022] [Indexed: 12/15/2022]
Abstract
Social evolution and the dynamics of social interactions have previously been studied under the frameworks of quantitative genetics and behavioural ecology. In quantitative genetics, indirect genetic effects of social partners on the socially plastic phenotypes of focal individuals typically lack crucial detail already included in treatments of social plasticity in behavioural ecology. Specifically, whilst focal individuals (e.g. receivers) may show variation in their 'responsiveness' to the social environment, individual social partners (e.g. signallers) may have a differential 'impact' on focal phenotypes. Here we propose an integrative framework, that highlights the distinction between responsiveness versus impact in indirect genetic effects for a range of behavioural traits. We describe impact and responsiveness using a reaction norm approach and provide statistical models for the assessment of these effects of focal and social partner identity in different types of social interactions. By providing such a framework, we hope to stimulate future quantitative research investigating the causes and consequences of social interactions on phenotypic evolution.
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Affiliation(s)
- Corné de Groot
- Behavioural Ecology, Department of Biology, Ludwig-Maximilians University of Munich (LMU), 82152 Planegg, Martinsried, Germany.
| | - Rori E Wijnhorst
- Behavioural Ecology, Department of Biology, Ludwig-Maximilians University of Munich (LMU), 82152 Planegg, Martinsried, Germany
| | - Tom Ratz
- Behavioural Ecology, Department of Biology, Ludwig-Maximilians University of Munich (LMU), 82152 Planegg, Martinsried, Germany
| | - Myranda Murray
- Center for Biodiversity Dynamics (CBD), Department of Biology, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
| | - Yimen G Araya-Ajoy
- Center for Biodiversity Dynamics (CBD), Department of Biology, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
| | - Jonathan Wright
- Center for Biodiversity Dynamics (CBD), Department of Biology, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
| | - Niels J Dingemanse
- Behavioural Ecology, Department of Biology, Ludwig-Maximilians University of Munich (LMU), 82152 Planegg, Martinsried, Germany
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2
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Haave-Audet E, Besson AA, Nakagawa S, Mathot KJ. Differences in resource acquisition, not allocation, mediate the relationship between behaviour and fitness: a systematic review and meta-analysis. Biol Rev Camb Philos Soc 2021; 97:708-731. [PMID: 34859575 DOI: 10.1111/brv.12819] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 11/17/2021] [Accepted: 11/22/2021] [Indexed: 11/29/2022]
Abstract
Within populations, individuals often show repeatable variation in behaviour, called 'animal personality'. In the last few decades, numerous empirical studies have attempted to elucidate the mechanisms maintaining this variation, such as life-history trade-offs. Theory predicts that among-individual variation in behavioural traits could be maintained if traits that are positively associated with reproduction are simultaneously associated with decreased survival, such that different levels of behavioural expression lead to the same net fitness outcome. However, variation in resource acquisition may also be important in mediating the relationship between individual behaviour and fitness components (survival and reproduction). For example, if certain phenotypes (e.g. dominance or aggressiveness) are associated with higher resource acquisition, those individuals may have both higher reproduction and higher survival, relative to others in the population. When individuals differ in their ability to acquire resources, trade-offs are only expected to be observed at the within-individual level (i.e. for a given amount of resource, if an individual increases its allocation to reproduction, it comes at the cost of allocation to survival, and vice versa), while among individuals traits that are associated with increased survival may also be associated with increased reproduction. We performed a systematic review and meta-analysis, asking: (i) do among-individual differences in behaviour reflect among-individual differences in resource acquisition and/or allocation, and (ii) is the relationship between behaviour and fitness affected by the type of behaviour and the testing environment? Our meta-analysis consisted of 759 estimates from 193 studies. Our meta-analysis revealed a positive correlation between pairs of estimates using both survival and reproduction as fitness proxies. That is, for a given study, behaviours that were associated with increased reproduction were also associated with increased survival, suggesting that variation in behaviour at the among-individual level largely reflects differences among individuals in resource acquisition. Furthermore, we found the same positive correlation between pairs of estimates using both survival and reproduction as fitness proxies at the phenotypic level. This is significant because we also demonstrated that these phenotypic correlations primarily reflect within-individual correlations. Thus, even when accounting for among-individual differences in resource acquisition, we did not find evidence of trade-offs at the within-individual level. Overall, the relationship between behaviour and fitness proxies was not statistically different from zero at the among-individual, phenotypic, and within-individual levels; this relationship was not affected by behavioural category nor by the testing condition. Our meta-analysis highlights that variation in resource acquisition may be more important in driving the relationship between behaviour and fitness than previously thought, including at the within-individual level. We suggest that this may come about via heterogeneity in resource availability or age-related effects, with higher resource availability and/or age leading to state-dependent shifts in behaviour that simultaneously increase both survival and reproduction. We emphasize that future studies examining the mechanisms maintaining behavioural variation in populations should test the link between behavioural expression and resource acquisition - both within and among individuals. Such work will allow the field of animal personality to develop specific predictions regarding the mediating effect of resource acquisition on the fitness consequences of individual behaviour.
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Affiliation(s)
- Elène Haave-Audet
- Department of Biological Sciences, University of Alberta, CW 405, Biological Sciences Bldg, Edmonton, AB, T6G 2E9, Canada
| | - Anne A Besson
- Department of Biological Sciences, University of Alberta, CW 405, Biological Sciences Bldg, Edmonton, AB, T6G 2E9, Canada.,Department of Zoology, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand
| | - Shinichi Nakagawa
- School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Kimberley J Mathot
- Department of Biological Sciences, University of Alberta, CW 405, Biological Sciences Bldg, Edmonton, AB, T6G 2E9, Canada.,Canada Research Chair, Integrative Ecology, Department of Biological Sciences, University of Alberta, Edmonton, AB, T6G 2E9, Canada
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3
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Han CS. Density-dependent sex-biased development of macroptery in a water strider. Ecol Evol 2020; 10:9514-9521. [PMID: 32953079 PMCID: PMC7487258 DOI: 10.1002/ece3.6644] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/15/2020] [Accepted: 07/17/2020] [Indexed: 12/16/2022] Open
Abstract
In wing-polymorphic insects, wing morphs differ not only in dispersal capability but also in life history traits because of trade-offs between flight capability and reproduction. When the fitness benefits and costs of producing wings differ between males and females, sex-specific trade-offs can result in sex differences in the frequency of long-winged individuals. Furthermore, the social environment during development affects sex differences in wing development, but few empirical tests of this phenomenon have been performed to date. Here, I used the wing-dimorphic water strider Tenagogerris euphrosyne to test how rearing density and sex ratio affect the sex-specific development of long-winged dispersing morphs (i.e., sex-specific macroptery). I also used a full-sib, split-family breeding design to assess genetic effects on density-dependent, sex-specific macroptery. I reared water strider nymphs at either high or low densities and measured their wing development. I found that long-winged morphs developed more frequently in males than in females when individuals were reared in a high-density environment. However, the frequency of long-winged morphs was not biased according to sex when individuals were reared in a low-density environment. In addition, full-sib males and females showed similar macroptery incidence rates at low nymphal density, whereas the macroptery incidence rates differed between full-sib males and females at high nymphal density. Thus complex gene-by-environment-by-sex interactions may explain the density-specific levels of sex bias in macroptery, although this interpretation should be treated with some caution. Overall, my study provides empirical evidence for density-specific, sex-biased wing development. My findings suggest that social factors as well as abiotic factors can be important in determining sex-biased wing development in insects.
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Affiliation(s)
- Chang S. Han
- Department of BiologyKyung Hee UniversitySeoulKorea
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4
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Pittet F, Tyson C, Herrington JA, Houdelier C, Lumineau S. Postnatal care generates phenotypic behavioural correlations in the Japanese quail. Behav Ecol Sociobiol 2019. [DOI: 10.1007/s00265-019-2735-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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5
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Mullon C, Lehmann L. An evolutionary quantitative genetics model for phenotypic (co)variances under limited dispersal, with an application to socially synergistic traits. Evolution 2019; 73:1695-1728. [PMID: 31325322 DOI: 10.1111/evo.13803] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 06/03/2019] [Indexed: 01/03/2023]
Abstract
Darwinian evolution consists of the gradual transformation of heritable traits due to natural selection and the input of random variation by mutation. Here, we use a quantitative genetics approach to investigate the coevolution of multiple quantitative traits under selection, mutation, and limited dispersal. We track the dynamics of trait means and of variance-covariances between traits that experience frequency-dependent selection. Assuming a multivariate-normal trait distribution, we recover classical dynamics of quantitative genetics, as well as stability and evolutionary branching conditions of invasion analyses, except that due to limited dispersal, selection depends on indirect fitness effects and relatedness. In particular, correlational selection that associates different traits within-individuals depends on the fitness effects of such associations between-individuals. We find that these kin selection effects can be as relevant as pleiotropy for the evolution of correlation between traits. We illustrate this with an example of the coevolution of two social traits whose association within-individuals is costly but synergistically beneficial between-individuals. As dispersal becomes limited and relatedness increases, associations between-traits between-individuals become increasingly targeted by correlational selection. Consequently, the trait distribution goes from being bimodal with a negative correlation under panmixia to unimodal with a positive correlation under limited dispersal.
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Affiliation(s)
- Charles Mullon
- Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland
| | - Laurent Lehmann
- Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland
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6
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Han CS, Jablonski PG. Alternative reproductive tactics shape within-species variation in behavioral syndromes. Behav Ecol 2019. [DOI: 10.1093/beheco/arz068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
AbstractMultiple behaviors can correlate with each other at the individual level (behavioral syndrome), and behavioral syndromes can vary in their direction between populations within a species. Within-species variation in behavioral syndromes is predicted to be associated with alternative reproductive tactics (ARTs), which evolve under different selection regimes. Here, we tested this using a water strider species, Gerris gracilicornis, in which males employ 2 ARTs that are fixed for life: signaling males (producing courtship ripples) versus nonsignaling males (producing no courtship ripples). We measured multiple behaviors in males with both of these ARTs and compared behavioral syndromes between them. Our results showed that signaling males were more active and attempted to mate more frequently than nonsignaling males. This shaped an overall behavioral syndrome between activities in mating and nonmating contexts when we pooled both ARTs. In addition, the behavioral syndromes between cautiousness and mating activity differed significantly between ARTs. In signaling males, the syndrome was significantly negative: signaling males more eager to mate tended to leave their refuges more rapidly. However, mating activity and cautiousness were not correlated in nonsignaling males. This might be because active males, in the context of predation risk and mating, were favored during the evolution and maintenance of the unique intimidating courtship tactic of G. gracilicornis males. Thus, our findings suggest that ARTs facilitate behavioral divergence and also contribute to the evolution of tactic-specific behavioral syndromes. We also show that research on ARTs and behavioral syndromes can be harmonized to study behavioral variation.
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Affiliation(s)
- Chang S Han
- Department of Biology, Kyung Hee University, Dongdaemun-Gu, Seoul, Korea
| | - Piotr G Jablonski
- Laboratory of Behavioral Ecology and Evolution, School of Biological Sciences, Seoul National University, Gwanak-gu, Seoul, Korea
- Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza, Warsaw, Poland
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7
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Han CS, Jablonski PG. Increased female resistance to mating promotes the effect of mechanical constraints on latency to pair. Ecol Evol 2018; 8:9152-9157. [PMID: 30377490 PMCID: PMC6194263 DOI: 10.1002/ece3.4373] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 06/26/2018] [Indexed: 11/11/2022] Open
Abstract
Size-assortative mating, defined as a positive linear association of body size between members of mating pairs, can arise from mechanical constraints on pairing efficiency, particularly when mating success is affected by males' mate-grasping force. In this context, female resistance is predicted to have an important role in changing the threshold force necessary for males to hold females, thereby contributing to the effect of mechanical constraints. Thus, increased female resistance is expected to increase the paring success of an optimally sized male relative to the female body size (sexual size ratio = male body size/female body size = 0.86), which leads to positive size-assortative mating. However, very little is known about the extent to which female resistance affects mechanical constraints on mate grasping. Here, using the water strider Gerris gracilicornis (Hemiptera: Gerridae), we tested whether the level of female resistance affected the relationship between the sexual size ratio and latency to pair. We found that optimally sized males mated sooner than other males when females resisted a male's mating attempts. When females did not resist, an effect of sexual size ratio on latency to pair was not found. Our results thus imply that increased female resistance to male mating attempts may strengthen the pattern of size-assortative mating. We provide clear empirical evidence that female resistance to mating influences the effect of mechanical constraints on size-assortative mating under sexual conflict. This result further suggests that patterns of size-assortative mating can be altered by a variety of ecological circumstances that change female resistance to mating in many other animal species under sexual conflict.
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Affiliation(s)
- Chang S. Han
- Laboratory of Behavioral Ecology and EvolutionSchool of Biological SciencesSeoul National UniversitySeoulSouth Korea
| | - Piotr G. Jablonski
- Laboratory of Behavioral Ecology and EvolutionSchool of Biological SciencesSeoul National UniversitySeoulSouth Korea
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8
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Peiman KS, Robinson BW. Comparative Analyses of Phenotypic Trait Covariation within and among Populations. Am Nat 2017; 190:451-468. [PMID: 28937814 DOI: 10.1086/693482] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Many morphological, behavioral, physiological, and life-history traits covary across the biological scales of individuals, populations, and species. However, the processes that cause traits to covary also change over these scales, challenging our ability to use patterns of trait covariance to infer process. Trait relationships are also widely assumed to have generic functional relationships with similar evolutionary potentials, and even though many different trait relationships are now identified, there is little appreciation that these may influence trait covariation and evolution in unique ways. We use a trait-performance-fitness framework to classify and organize trait relationships into three general classes, address which ones more likely generate trait covariation among individuals in a population, and review how selection shapes phenotypic covariation. We generate predictions about how trait covariance changes within and among populations as a result of trait relationships and in response to selection and consider how these can be tested with comparative data. Careful comparisons of covariation patterns can narrow the set of hypothesized processes that cause trait covariation when the form of the trait relationship and how it responds to selection yield clear predictions about patterns of trait covariation. We discuss the opportunities and limitations of comparative approaches to evaluate hypotheses about the evolutionary causes and consequences of trait covariation and highlight the importance of evaluating patterns within populations replicated in the same and in different selective environments. Explicit hypotheses about trait relationships are key to generating effective predictions about phenotype and its evolution using covariance data.
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9
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Han CS, Santostefano F, Dingemanse NJ. Do social partners affect same-sex sexual behaviour in male water striders? Anim Behav 2016. [DOI: 10.1016/j.anbehav.2016.03.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Han CS, Brooks RC, Jablonski PG. Fluctuating sexual selection and the evolution of a courtship strategy. Behav Ecol 2016. [DOI: 10.1093/beheco/arv232] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Han CS, Jablonski PG. Predators induce conditions for size-dependent alternative reproductive tactics in a water strider male. Anim Behav 2016. [DOI: 10.1016/j.anbehav.2015.10.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Urszán TJ, Garamszegi LZ, Nagy G, Hettyey A, Török J, Herczeg G. No personality without experience? A test on Rana dalmatina tadpoles. Ecol Evol 2015; 5:5847-56. [PMID: 26811759 PMCID: PMC4717344 DOI: 10.1002/ece3.1804] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 09/23/2015] [Accepted: 09/28/2015] [Indexed: 11/07/2022] Open
Abstract
While the number of studies reporting the presence of individual behavioral consistency (animal personality, behavioral syndrome) has boomed in the recent years, there is still much controversy about the proximate and ultimate mechanisms resulting in the phenomenon. For instance, direct environmental effects during ontogeny (phenotypic plasticity) as the proximate mechanism behind the emergence of consistent individual differences in behavior are usually overlooked compared to environmental effects operating across generations (genetic adaptation). Here, we tested the effects of sociality and perceived predation risk during ontogeny on the strength of behavioral consistency in agile frog (Rana dalmatina) tadpoles in a factorial common garden experiment. Tadpoles reared alone and without predatory cues showed zero repeatability within (i.e., lack of personality) and zero correlation between (i.e., lack of syndrome) activity and risk-taking. On the other hand, cues from predators alone induced both activity and risk-taking personalities, while cues from predators and conspecifics together resulted in an activity - risk-taking behavioral syndrome. Our results show that individual experience has an unequivocal role in the emergence of behavioral consistency. In this particular case, the development of behavioral consistency was most likely the result of genotype × environment interactions, or with other words, individual variation in behavioral plasticity.
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Affiliation(s)
- Tamás J Urszán
- Behavioural Ecology Group Department of Systematic Zoology and Ecology Eötvös Loránd University Pázmány Péter sétány, 1/c Budapest H-1117 Hungary
| | - László Z Garamszegi
- Department of Evolutionary Ecology Estacion Biologica de Donana - CSIC c/Americo Vespucio, s/n Seville 41092 Spain
| | - Gergely Nagy
- Behavioural Ecology Group Department of Systematic Zoology and Ecology Eötvös Loránd University Pázmány Péter sétány, 1/c Budapest H-1117 Hungary
| | - Attila Hettyey
- Lendület Evolutionary Ecology Research Group MTA ATK NÖVI Herman Ottó út 15 Budapest 1022 Hungary
| | - János Török
- Behavioural Ecology Group Department of Systematic Zoology and Ecology Eötvös Loránd University Pázmány Péter sétány, 1/c Budapest H-1117 Hungary
| | - Gábor Herczeg
- Behavioural Ecology Group Department of Systematic Zoology and Ecology Eötvös Loránd University Pázmány Péter sétány, 1/c Budapest H-1117 Hungary
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13
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Akçay Ç, Campbell SE, Beecher MD. The fitness consequences of honesty: Under-signalers have a survival advantage in song sparrows. Evolution 2015; 69:3186-93. [PMID: 26573880 DOI: 10.1111/evo.12818] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 10/24/2015] [Accepted: 10/31/2015] [Indexed: 01/28/2023]
Abstract
How honest or reliable signaling can evolve and be maintained has been a major question in evolutionary biology. The question is especially puzzling for a particular class of signals used in aggressive interactions: threat signals. Here, we report a study on song sparrows (Melospiza melodia) in which we assayed males with playbacks on their territories to quantify their aggressiveness (flights and close proximity) and aggressive signaling levels (rates of soft song, a close-range signal reliably predicting attack) and asked whether these traits affect individuals' survival on territory. We found that the effect of aggressive signaling via soft song interacted with aggressive behaviors such that there was a negative correlational selection: among males with low aggression, those males that signaled at higher levels (over-signalers) had higher survival whereas among males with high aggression those that signaled at low levels (under-signalers) survived longer. In other words, males that deviate from reliable signaling have a survival advantage. These results, along with previous research that suggested most of the deviation from reliable signaling in this system is in the form of under-signaling (high-aggression males signaling at low levels) pose a puzzle for future research on how this reliable signaling system is maintained.
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Affiliation(s)
- Çağlar Akçay
- Department of Psychology, University of Washington, Seattle, Washington, 98195. .,Department of Biological Sciences, Virginia Tech, Blacksburg, Virginia, 24061.
| | | | - Michael D Beecher
- Department of Psychology, University of Washington, Seattle, Washington, 98195.,Department of Biology, University of Washington, Seattle, Washington, 98195
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14
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Intimidating courtship and sex differences in predation risk lead to sex-specific behavioural syndromes. Anim Behav 2015. [DOI: 10.1016/j.anbehav.2015.08.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Head ML, Vega-Trejo R, Jacomb F, Jennions MD. Predictors of male insemination success in the mosquitofish (Gambusia holbrooki). Ecol Evol 2015; 5:4999-5006. [PMID: 26640677 PMCID: PMC4662323 DOI: 10.1002/ece3.1775] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 09/20/2015] [Indexed: 12/03/2022] Open
Abstract
Identifying targets of selection is key to understanding the evolution of sexually selected behavioral and morphological traits. Many animals have coercive mating, yet little is known about whether and how mate choice operates when these are the dominant mating tactic. Here, we use multivariate selection analysis to examine the direction and shape of selection on male insemination success in the mosquitofish (Gambusia holbrooki). We found direct selection on only one of five measured traits, but correlational selection involving all five traits. Larger males with longer gonopodia and with intermediate sperm counts were more likely to inseminate females than smaller males with shorter gonopodia and extreme sperm counts. Our results highlight the need to investigate sexual selection using a multivariate framework even in species that lack complex sexual signals. Further, female choice appears to be important in driving the evolution of male sexual traits in this species where sexual coercion is the dominant mating tactic.
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Affiliation(s)
- Megan L Head
- Division of Evolution, Ecology and Genetics Research School of Biology Australian National University Acton Canberra Australian Capital Territory 0200 Australia
| | - Regina Vega-Trejo
- Division of Evolution, Ecology and Genetics Research School of Biology Australian National University Acton Canberra Australian Capital Territory 0200 Australia
| | - Frances Jacomb
- Division of Evolution, Ecology and Genetics Research School of Biology Australian National University Acton Canberra Australian Capital Territory 0200 Australia
| | - Michael D Jennions
- Division of Evolution, Ecology and Genetics Research School of Biology Australian National University Acton Canberra Australian Capital Territory 0200 Australia
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16
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Same-sex sexual behaviour as a by-product of reproductive strategy under male–male scramble competition. Anim Behav 2015. [DOI: 10.1016/j.anbehav.2015.07.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Wuerz Y, Krüger O. Personality over ontogeny in zebra finches: long-term repeatable traits but unstable behavioural syndromes. Front Zool 2015; 12 Suppl 1:S9. [PMID: 26813709 PMCID: PMC4722341 DOI: 10.1186/1742-9994-12-s1-s9] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
A crucial assumption of animal personality research is that behaviour is consistent over time, showing a high repeatability within individuals. This assumption is often made, sometimes tested using short time intervals between behavioural tests, but rarely thoroughly investigated across long time intervals crossing different stages of ontogeny. We performed such a longitudinal test across three life stages in zebra finches (Taeniopygia guttata), representing about 15-20% of their life span in captivity, and found repeatabilities ranging from 0.03 to 0.67. Fearlessness and exploration were the most repeatable traits both within and across life stages. Activity and aggression were repeatable across, but not or only partly within life stages. Boldness was not repeatable. Furthermore, we found no evidence for a consistent behavioural syndrome structure across ontogeny. Our results indicate that the consistency of behavioural traits and their correlations might be overestimated and suggest that life-long stability of animal personality should not simply be assumed.
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Affiliation(s)
- Yvonne Wuerz
- Department of Animal Behaviour, Bielefeld University, PO Box 100131, 33501 Bielefeld Germany
| | - Oliver Krüger
- Department of Animal Behaviour, Bielefeld University, PO Box 100131, 33501 Bielefeld Germany
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18
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Niemela PT, Lattenkamp EZ, Dingemanse NJ. Personality-related survival and sampling bias in wild cricket nymphs. Behav Ecol 2015. [DOI: 10.1093/beheco/arv036] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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19
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Han CS, Brooks RC. The interaction between genotype and juvenile and adult density environment in shaping multidimensional reaction norms of behaviour. Funct Ecol 2014. [DOI: 10.1111/1365-2435.12299] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Chang S. Han
- Evolution & Ecology Research Centre School of Biological, Earth and Environmental Sciences The University of New South Wales Sydney 2052 NSWAustralia
| | - Robert C. Brooks
- Evolution & Ecology Research Centre School of Biological, Earth and Environmental Sciences The University of New South Wales Sydney 2052 NSWAustralia
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20
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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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