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Potter T, Arendt J, Bassar RD, Watson B, Bentzen P, Travis J, Reznick DN. Female preference for rare males is maintained by indirect selection in Trinidadian guppies. Science 2023; 380:309-312. [PMID: 37079663 DOI: 10.1126/science.ade5671] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
When females prefer mates with rare phenotypes, sexual selection can maintain rather than deplete genetic variation. However, there is no consensus on why this widespread and frequently observed preference might evolve and persist. We examine the fitness consequences of female preference for rare male color patterns in a natural population of Trinidadian guppies, using a pedigree that spans 10 generations. We demonstrate (i) a rare male reproductive advantage, (ii) that females that mate with rare males gain an indirect fitness advantage through the mating success of their sons, and (iii) the fitness benefit that females accrue through their "sexy sons" evaporates for their grandsons as their phenotype becomes common. Counter to prevailing theory, we show that female preference can be maintained through indirect selection.
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Affiliation(s)
- Tomos Potter
- Department of Biological Science, Florida State University, Tallahassee, Florida, USA
| | - Jeff Arendt
- Department of Evolution, Ecology and Organismal Biology, University of California, Riverside, California, USA
| | - Ronald D Bassar
- Department of Biological Sciences, Auburn University, Auburn, Alabama, USA
| | - Beth Watson
- Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Paul Bentzen
- Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Joseph Travis
- Department of Biological Science, Florida State University, Tallahassee, Florida, USA
| | - David N Reznick
- Department of Evolution, Ecology and Organismal Biology, University of California, Riverside, California, USA
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2
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Gefaell J, Galindo J, Rolán-Alvarez E. Shell color polymorphism in marine gastropods. Evol Appl 2023; 16:202-222. [PMID: 36793692 PMCID: PMC9923496 DOI: 10.1111/eva.13416] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 04/21/2022] [Accepted: 04/28/2022] [Indexed: 12/01/2022] Open
Abstract
Marine gastropods are characterized by an incredible variation in shell color. In this review, we aim to introduce researchers to previous studies of shell color polymorphism in this group of animals, trying to provide an overview of the topic and highlighting some potential avenues for future research. For this, we tackle the different aspects of shell color polymorphism in marine gastropods: its biochemical and genetic basis, its patterns of spatial and temporal distribution, as well as its potential evolutionary causes. In particular, we put special emphasis on the evolutionary studies that have been conducted so far to reveal the evolutionary mechanisms responsible for the maintenance of shell color polymorphism in this group of animals, as it constitutes the least addressed aspect in existing literature reviews. Several general conclusions can be drawn from our review: First, natural selection is commonly involved in the maintenance of gastropod color polymorphism; second, although the contribution of neutral forces (gene flow-genetic drift equilibrium) to shell color polymorphism maintenance do not seem to be particularly important, it has rarely been studied systematically; third, a relationship between shell color polymorphism and mode of larval development (related to dispersal capability) may exist. As for future studies, we suggest that a combination of both classical laboratory crossing experiments and -Omics approaches may yield interesting results on the molecular basis of color polymorphism. We believe that understanding the various causes of shell color polymorphism in marine gastropods is of great importance not only to understand how biodiversity works, but also for protecting such biodiversity, as knowledge of its evolutionary causes may help implement conservation measures in those species or ecosystems that are threatened.
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Affiliation(s)
- Juan Gefaell
- Departamento de Bioquímica Genética e Inmunología Centro de Investigación Mariña Universidade de Vigo Vigo Spain
| | - Juan Galindo
- Departamento de Bioquímica Genética e Inmunología Centro de Investigación Mariña Universidade de Vigo Vigo Spain
| | - Emilio Rolán-Alvarez
- Departamento de Bioquímica Genética e Inmunología Centro de Investigación Mariña Universidade de Vigo Vigo Spain
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3
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Female-female aggression and male responses to the two colour morphs of female common cuckoos. Naturwissenschaften 2020; 107:28. [PMID: 32564143 PMCID: PMC7306036 DOI: 10.1007/s00114-020-01680-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 04/23/2020] [Accepted: 04/27/2020] [Indexed: 01/01/2023]
Abstract
Female-only colour polymorphism is rare in birds, but occurs in brood parasitic cuckoos (Cuculidae). Obligate brood parasites leave incubation and parental care to other species (hosts), so female-female interactions can play a role in how parasites guard critical resources (host nests) within their laying areas. The plumage of adult female common cuckoos (Cuculus canorus) is either rufous (typically rare) or grey (common), whereas adult male conspecifics are monochromatic (grey). In previous studies, hosts and conspecific males responded with less intensity toward the rare female morph in support of a negative frequency-dependent benefit of female plumage polychromatism. Here, we assessed responses of both conspecific females and males to vocal playbacks of female calls, coupled with one of two 3D models of the different morphs of female cuckoos. At our study population, the rufous female morph was as common as the grey morph; therefore, we predicted similarly high rates of conspecific responses in both treatments. Both female and male cuckoos responded to playbacks acoustically, which demonstrated the primary role of acoustic communication in social interactions amongst cuckoos. Following this, some cuckoos flew closer to the models to inspect them visually. As predicted, no significant differences were detected between the live cuckoos’ responses toward the two colour morphs in this population. We conclude that dichromatism in female cuckoos evolved to serve one or more functions other than conspecific signalling.
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4
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Kikuchi DW, Waldron SJ, Valkonen JK, Dobler S, Mappes J. Biased predation could promote convergence yet maintain diversity within Müllerian mimicry rings of Oreina leaf beetles. J Evol Biol 2020; 33:887-898. [PMID: 32202678 DOI: 10.1111/jeb.13620] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Revised: 02/10/2020] [Accepted: 03/15/2020] [Indexed: 12/01/2022]
Abstract
Müllerian mimicry is a classic example of adaptation, yet Müller's original theory does not account for the diversity often observed in mimicry rings. Here, we aimed to assess how well classical Müllerian mimicry can account for the colour polymorphism found in chemically defended Oreina leaf beetles by using field data and laboratory assays of predator behaviour. We also evaluated the hypothesis that thermoregulation can explain diversity between Oreina mimicry rings. We found that frequencies of each colour morph were positively correlated among species, a critical prediction of Müllerian mimicry. Predators learned to associate colour with chemical defences. Learned avoidance of the green morph of one species protected green morphs of another species. Avoidance of blue morphs was completely generalized to green morphs, but surprisingly, avoidance of green morphs was less generalized to blue morphs. This asymmetrical generalization should favour green morphs: indeed, green morphs persist in blue communities, whereas blue morphs are entirely excluded from green communities. We did not find a correlation between elevation and coloration, rejecting thermoregulation as an explanation for diversity between mimicry rings. Biased predation could explain within-community diversity in warning coloration, providing a solution to a long-standing puzzle. We propose testable hypotheses for why asymmetric generalization occurs, and how predators maintain the predominance of blue morphs in a community, despite asymmetric generalization.
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Affiliation(s)
- David W Kikuchi
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA.,Department of Biological and Environmental Sciences, Centre of Excellence in Evolutionary Research, University of Jyväskylä, Jyväskylä, Finland.,Wissenschaftskolleg zu Berlin, Berlin, Germany
| | - Samuel J Waldron
- Department of Biological and Environmental Sciences, Centre of Excellence in Evolutionary Research, University of Jyväskylä, Jyväskylä, Finland.,Molecular Evolutionary Biology, Department of Biology, Universität Hamburg, Hamburg, Germany
| | - Janne K Valkonen
- Department of Biological and Environmental Sciences, Centre of Excellence in Evolutionary Research, University of Jyväskylä, Jyväskylä, Finland
| | - Susanne Dobler
- Molecular Evolutionary Biology, Department of Biology, Universität Hamburg, Hamburg, Germany
| | - Johanna Mappes
- Department of Biological and Environmental Sciences, Centre of Excellence in Evolutionary Research, University of Jyväskylä, Jyväskylä, Finland.,Wissenschaftskolleg zu Berlin, Berlin, Germany
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5
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Ajuria Ibarra H, Kinahan M, Marcetteau J, Mehigan AJR, Ziegelmeier RO, Reader T. The significance of prey avoidance behavior for the maintenance of a predator color polymorphism. Behav Ecol 2019. [DOI: 10.1093/beheco/ary129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Helena Ajuria Ibarra
- School of Life Sciences, University of Nottingham, University Park, Nottingham, UK
| | - Michael Kinahan
- School of Life Sciences, University of Nottingham, University Park, Nottingham, UK
| | - Julien Marcetteau
- School of Life Sciences, University of Nottingham, University Park, Nottingham, UK
| | - Andrew J R Mehigan
- School of Life Sciences, University of Nottingham, University Park, Nottingham, UK
| | - Ross O Ziegelmeier
- School of Life Sciences, University of Nottingham, University Park, Nottingham, UK
| | - Tom Reader
- School of Life Sciences, University of Nottingham, University Park, Nottingham, UK
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6
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Matthews G, Goulet CT, Delhey K, Atkins ZS, While GM, Gardner MG, Chapple DG. Avian predation intensity as a driver of clinal variation in colour morph frequency. J Anim Ecol 2018; 87:1667-1684. [PMID: 30098209 DOI: 10.1111/1365-2656.12894] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 07/28/2018] [Indexed: 12/23/2022]
Abstract
Phenotypic variation provides the framework for natural selection to work upon, enabling adaptive evolution. One of the most discernible manifestations of phenotypic variability is colour variation. When this variation is discrete, genetically based colour pattern morphs occur simultaneously within a population. Why and how colour polymorphisms are maintained is an evolutionary puzzle. Several evolutionary drivers have been hypothesized as influencing clinal patterns of morph frequency, with spatial variation in climate and predation being considered especially important. Despite this, no study has examined both of their roles simultaneously. The aims of this study were to: (a) examine the covariation of physiology, environmental variables and colouration at a local scale; and (b) determine if these factors and their interplay explain broad clinal variation in morph frequency. We used the lizard Liopholis whitii as a model system, as this species displays a discrete, heritable polymorphism for colour pattern (plain-backed, patterned morphs) whose morph frequency varies latitudinally. We measured reflectance, field activity temperatures and microhabitat structure to test for differences in crypsis, thermal biology and microhabitat selection of patterned and plain-backed morphs within a single population where colour morphs occur sympatrically. We then used data from the literature to perform a broad-scale analysis to identify whether these factors also explained the latitudinal variation of morph frequency in this species. At the local scale, plain-backed morphs were found to be less cryptic than patterned morphs while no other differences were detected in terms of thermal biology, dorsal reflectance and microhabitat use. At a broader scale, predation was the most influential factor mediating morph frequency across latitudes. However, the observed pattern of morph frequency is opposite to what the modelling results suggest in that the incidence of the least cryptic morph is highest where predation pressure is most severe. Clinal variation in the level of background matching between morphs or the potential reproductive advantage by the plain-backed morph may, instead, be driving the observed morph frequency. Together, these results provide key insights into the evolution of local adaptation as well as the ecological forces involved in driving the dynamics of colour polymorphism.
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Affiliation(s)
- Genevieve Matthews
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
| | - Celine T Goulet
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
| | - Kaspar Delhey
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
| | - Zak S Atkins
- Department of Ecology, Environment and Evolution, La Trobe University, Melbourne, Victoria, Australia
| | - Geoffrey M While
- School of Biological Sciences, University of Tasmania, Hobart, Tasmania, Australia
| | - Michael G Gardner
- School of Biological Sciences, Flinders University of South Australia, Adelaide, South Australia, Australia.,The Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia
| | - David G Chapple
- School of Biological Sciences, Monash University, Clayton, Victoria, Australia
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7
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Rodríguez-Morales D, Rico-Gray V, García-Franco JG, Ajuria-Ibarra H, Hernández-Salazar LT, Robledo-Ospina LE, Rao D. Context-dependent crypsis: a prey's perspective of a color polymorphic predator. Naturwissenschaften 2018; 105:36. [PMID: 29754205 DOI: 10.1007/s00114-018-1562-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 05/04/2018] [Accepted: 05/07/2018] [Indexed: 12/11/2022]
Abstract
Many animals use body coloration as a strategy to communicate with conspecifics, prey, and predators. Color is a trade-off for some species, since they should be visible to conspecifics but cryptic to predators and prey. Some flower-dwelling predators, such as crab spiders, are capable of choosing the color of flowers where they ambush flower visitors and pollinators. In order to avoid being captured, visitors evaluate flowers visually before landing. The crab spider Mecaphesa dubia is a polymorphic species (white/purple color morphs), which inhabits the flower heads of a dune plant, Palafoxia lindenii. Using full-spectrum photography of spiders and flowers, we evaluated how honeybees perceived the spiders at different distances. Using visual modeling, we obtained the chromatic and achromatic contrasts of the spiders on flower heads as perceived by honeybees. Purple morphs were found mainly on the receptacle area and white morphs were equally likely to be found in the flowers and receptacle. According to theoretical modeling, white morphs were visible to honeybees from a distance of 10 cm in receptacle area but appeared to be cryptic in the flower area. Purple morphs were cryptic on the receptacle and less so when they were on the flowers. Spiders on flower heads are predicted to be more easily detected by honeybees using chromatic contrast. Our study shows that the conspicuousness of flower dwelling spiders to honeybees depends on the color morph, the distance of observation, and the position of spider on the flower head.
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Affiliation(s)
- D Rodríguez-Morales
- Instituto de Neuroetología, Universidad Veracruzana, Av. Luis Castelazo, Col. Industrial Animas, Xalapa, 91190, Veracruz, Mexico.
| | - V Rico-Gray
- Instituto de Neuroetología, Universidad Veracruzana, Av. Luis Castelazo, Col. Industrial Animas, Xalapa, 91190, Veracruz, Mexico
| | - J G García-Franco
- Red de Ecología Funcional, Instituto de Ecología, A.C. Carretera Antigua a Coatepec 351, El Haya, Xalapa, 91070, Veracruz, Mexico
| | - H Ajuria-Ibarra
- Instituto de Biotecnologia y Ecologia Aplicada, Universidad Veracruzana, Av. Culturas Veracruzanas No. 101, Xalapa, 91090, Veracruz, Mexico
| | - L T Hernández-Salazar
- Instituto de Neuroetología, Universidad Veracruzana, Av. Luis Castelazo, Col. Industrial Animas, Xalapa, 91190, Veracruz, Mexico
| | - L E Robledo-Ospina
- Red de Ecoetología, Instituto de Ecología, A.C. Carretera antigua a Coatepec No. 351, Xalapa, 91070, Veracruz, Mexico.,Grupo de Aracnología, Universidad de Caldas, Calle 65 No. 26-10, Manizales, Colombia
| | - D Rao
- Instituto de Biotecnologia y Ecologia Aplicada, Universidad Veracruzana, Av. Culturas Veracruzanas No. 101, Xalapa, 91090, Veracruz, Mexico
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8
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Franks DW, Oxford GS. The co-evolution of anti-predator polymorphisms in sympatric populations. Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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9
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10
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Cotoras DD, Brewer MS, Croucher PJP, Oxford GS, Lindberg DR, Gillespie RG. Convergent evolution in the colour polymorphism ofSelkirkiellaspiders (Theridiidae) from the South American temperate rainforest. Biol J Linn Soc Lond 2016. [DOI: 10.1111/bij.12908] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Darko D. Cotoras
- Department of Integrative Biology; University of California; 3060 Valley Life Sciences Building Berkeley CA 94720-3140 USA
| | - Michael S. Brewer
- Department of Biology; East Carolina University; 1000 E 5th Street Greenville NC 27858-4353 USA
| | - Peter J. P. Croucher
- Essig Museum of Entomology; University of California; 1170 Valley Life Sciences Building Berkeley CA 94720-3140 USA
- Trovagene Inc.; 11055 Flintkote Avenue San Diego CA 92121 USA
| | - Geoff S. Oxford
- Department of Biology; University of York; Wentworth Way Heslington York YO10 5DD UK
| | - David R. Lindberg
- Department of Integrative Biology; University of California; 3060 Valley Life Sciences Building Berkeley CA 94720-3140 USA
- Museum of Paleontology; University of California; 1101 Valley Life Sciences Building Berkeley CA 94720-3140 USA
| | - Rosemary G. Gillespie
- Department of Environmental Science; University of California; 137 Mulford Hall Berkeley CA 94720-3114 USA
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11
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Johannesson K, Butlin RK. What explains rare and conspicuous colours in a snail? A test of time-series data against models of drift, migration or selection. Heredity (Edinb) 2016; 118:21-30. [PMID: 27649616 PMCID: PMC5176118 DOI: 10.1038/hdy.2016.77] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 06/24/2016] [Accepted: 07/26/2016] [Indexed: 12/24/2022] Open
Abstract
It is intriguing that conspicuous colour morphs of a prey species may be maintained at low frequencies alongside cryptic morphs. Negative frequency-dependent selection by predators using search images ('apostatic selection') is often suggested without rejecting alternative explanations. Using a maximum likelihood approach we fitted predictions from models of genetic drift, migration, constant selection, heterozygote advantage or negative frequency-dependent selection to time-series data of colour frequencies in isolated populations of a marine snail (Littorina saxatilis), re-established with perturbed colour morph frequencies and followed for >20 generations. Snails of conspicuous colours (white, red, banded) are naturally rare in the study area (usually <10%) but frequencies were manipulated to levels of ~50% (one colour per population) in 8 populations at the start of the experiment in 1992. In 2013, frequencies had declined to ~15-45%. Drift alone could not explain these changes. Migration could not be rejected in any population, but required rates much higher than those recorded. Directional selection was rejected in three populations in favour of balancing selection. Heterozygote advantage and negative frequency-dependent selection could not be distinguished statistically, although overall the results favoured the latter. Populations varied idiosyncratically as mild or variable colour selection (3-11%) interacted with demographic stochasticity, and the overall conclusion was that multiple mechanisms may contribute to maintaining the polymorphisms.
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Affiliation(s)
- K Johannesson
- Department of Marine Sciences, University of Gothenburg, Strömstad, Sweden.,Centre for Marine Evolutionary Biology, University of Gothenburg, Strömstad, Sweden
| | - R K Butlin
- Centre for Marine Evolutionary Biology, University of Gothenburg, Strömstad, Sweden.,Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK.,Stellenbosch Institute for Advanced Studies (STIAS), Wallenberg Research Centre at Stellenbosch University, Stellenbosch, South Africa
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12
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Hedrick PW, Smith DW, Stahler DR. Negative-assortative mating for color in wolves. Evolution 2016; 70:757-66. [PMID: 26988852 DOI: 10.1111/evo.12906] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 02/13/2016] [Accepted: 03/01/2016] [Indexed: 12/01/2022]
Abstract
There is strong negative-assortative mating for gray and black pelage color in the iconic wolves in Yellowstone National Park. This is the first documented case of significant negative-assortative mating in mammals and one of only a very few cases in vertebrates. Of 261 matings documented from 1995 to 2015, 63.6% were between gray and black wolves and the correlation between mates for color was -0.266. There was a similar excess of matings of both gray males × black females and black males × gray females. Using the observed frequency of negative-assortative mating in a model with both random and negative-assortative mating, the estimated proportion of negative-assortative mating was 0.430. The estimated frequency of black wolves in the population from 1996 to 2014 was 0.452 and these frequencies appear stable over this 19-year period. Using the estimated level of negative-assortative mating, the predicted equilibrium frequency of the dominant allele was 0.278, very close to the mean value of 0.253 observed. In addition, the patterns of genotype frequencies, that is, the observed proportion of black homozygotes and the observed excess of black heterozygotes, are consistent with negative-assortative mating. Importantly these results demonstrate that negative-assortative mating could be entirely responsible for the maintenance of this well-known color polymorphism.
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Affiliation(s)
- Philip W Hedrick
- School of Life Sciences, Arizona State University, Tempe, Arizona, 85287.
| | - Douglas W Smith
- Yellowstone Wolf Project, Yellowstone Center for Resources, Yellowstone National Park, Wyoming, 82190
| | - Daniel R Stahler
- Yellowstone Wolf Project, Yellowstone Center for Resources, Yellowstone National Park, Wyoming, 82190
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13
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Fincke OM. Trade-offs in female signal apparency to males offer alternative anti-harassment strategies for colour polymorphic females. J Evol Biol 2015; 28:931-43. [PMID: 25786740 DOI: 10.1111/jeb.12623] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 03/10/2015] [Accepted: 03/12/2015] [Indexed: 01/22/2023]
Abstract
Colour polymorphisms are known to influence receiver behaviour, but how they affect a receiver's ability to detect and recognize individuals in nature is usually unknown. I hypothesized that polymorphic female damselflies represent an evolutionary stable strategy, maintained by trade-offs between the relative apparency of morphs to male receivers. Using field experiments on Enallagma hageni and focal studies of E. hageni and Enallagma boreale, I tested for the first time the predictions that (i) green heteromorphs and blue andromorphs gain differential protection from sexual harassment via background crypsis and sexual mimicry, respectively, and (ii) female morphs behaviourally optimize their signal apparency to mate-searching males. First, based on male reactions elicited by females, against a high-contrast background, the two morphs did not differ in being detected by males, and once detected, they did not differ in being recognized (eliciting sexual reactions). However, on green ferns, heteromorphs were less likely to be detected (elicited only fly-bys) than andromorphs, but once detected, the morphs did not differ in being recognized. In contrast, when perched on a dowel with two male signal distractors, andromorphs were detected less often, and once detected, they were recognized less often than heteromorphs. Second, in fields where females foraged, andromorphs perched higher on vegetation than heteromorphs and were more often in the vicinity of males. Neither harassment rates nor evasive behaviours differed between morphs. Males aggregated in high density near shore where solitary females were rare. Equilibrium frequencies of these and other colour morphs should reflect the relative ease with which receivers detect and recognize them in the context where they are encountered.
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Affiliation(s)
- O M Fincke
- Ecology and Evolutionary Biology Graduate Program, Department of Biology, University of Oklahoma Norman, Norman, OK, USA
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14
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Ajuria Ibarra H, Reader T. Female-limited colour polymorphism in the crab spiderSynema globosum(Araneae: Thomisidae). Biol J Linn Soc Lond 2014. [DOI: 10.1111/bij.12338] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Helena Ajuria Ibarra
- School of Life Sciences; University Park; University of Nottingham; Nottingham NG7 2RD UK
| | - Tom Reader
- School of Life Sciences; University Park; University of Nottingham; Nottingham NG7 2RD UK
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15
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Green KK, Svensson EI, Bergsten J, Härdling R, Hansson B. The interplay between local ecology, divergent selection, and genetic drift in population divergence of a sexually antagonistic female trait. Evolution 2014; 68:1934-46. [PMID: 24635214 DOI: 10.1111/evo.12408] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 03/03/2014] [Indexed: 12/21/2022]
Abstract
Genetically polymorphic species offer the possibility to study maintenance of genetic variation and the potential role for genetic drift in population divergence. Indirect inference of the selection regimes operating on polymorphic traits can be achieved by comparing population divergence in neutral genetic markers with population divergence in trait frequencies. Such an approach could further be combined with ecological data to better understand agents of selection. Here, we infer the selective regimes acting on a polymorphic mating trait in an insect group; the dorsal structures (either rough or smooth) of female diving beetles. Our recent work suggests that the rough structures have a sexually antagonistic function in reducing male mating attempts. For two species (Dytiscus lapponicus and Graphoderus zonatus), we could not reject genetic drift as an explanation for population divergence in morph frequencies, whereas for the third (Hygrotus impressopunctatus) we found that divergent selection pulls morph frequencies apart across populations. Furthermore, population morph frequencies in H. impressopunctatus were significantly related to local bioclimatic factors, providing an additional line of evidence for local adaptation in this species. These data, therefore, suggest that local ecological factors and sexual conflict interact over larger spatial scales to shape population divergence in the polymorphism.
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Affiliation(s)
- Kristina Karlsson Green
- Department of Biology, Lund University, Sölvegatan 37, SE-223 62 Lund, Sweden; Current Address: Department of Biosciences, University of Helsinki, PO Box 65, FI-00014 Helsinki, Finland.
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16
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