1
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Carlson ML, Stoddard MC. Evolution of Plumage Patterns in a Pattern Morphospace: A Phylogenetic Analysis of Melanerpine Woodpeckers. Am Nat 2024; 203:55-72. [PMID: 38207134 DOI: 10.1086/727508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
AbstractPlumage patterns of melanerpine (Melanerpes-Sphyrapicus) woodpeckers are strikingly diverse. Understanding the evolution and function of this diversity is challenging because of the difficulty of quantifying plumage patterns. We use a three-dimensional space to characterize the evolution of melanerpine achromatic plumage patterns. The axes of the space are three pattern features (spatial frequency, orientation, and contrast) quantified using two-dimensional fast Fourier transformation of museum specimen images. Mapping plumage in pattern space reveals differences in how species and subclades occupy the space. To quantify these differences, we derive two new measures of pattern: pattern diversity (diversity across plumage patches within a species) and pattern uniqueness (divergence of patterns from those of other species). We estimate that the melanerpine ancestor had mottled plumage and find that pattern traits across patches and subclades evolve at different rates. We also find that smaller species are more likely to display horizontal face patterning. We promote pattern spaces as powerful tools for investigating animal pattern evolution.
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2
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Eliason CM, McCullough JM, Hackett SJ, Andersen MJ. Complex plumages spur rapid color diversification in kingfishers (Aves: Alcedinidae). eLife 2023; 12:83426. [PMID: 37083474 PMCID: PMC10121218 DOI: 10.7554/elife.83426] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 03/22/2023] [Indexed: 04/22/2023] Open
Abstract
Colorful signals in nature provide some of the most stunning examples of rapid phenotypic evolution. Yet, studying color pattern evolution has been historically difficult owing to differences in perceptual ability of humans and analytical challenges with studying how complex color patterns evolve. Island systems provide a natural laboratory for testing hypotheses about the direction and magnitude of phenotypic change. A recent study found that plumage colors of island species are darker and less complex than continental species. Whether such shifts in plumage complexity are associated with increased rates of color evolution remains unknown. Here, we use geometric morphometric techniques to test the hypothesis that plumage complexity and insularity interact to influence color diversity in a species-rich clade of colorful birds-kingfishers (Aves: Alcedinidae). In particular, we test three predictions: (1) plumage complexity enhances interspecific rates of color evolution, (2) plumage complexity is lower on islands, and (3) rates of plumage color evolution are higher on islands. Our results show that more complex plumages result in more diverse colors among species and that island species have higher rates of color evolution. Importantly, we found that island species did not have more complex plumages than their continental relatives. Thus, complexity may be a key innovation that facilitates evolutionary response of individual color patches to distinct selection pressures on islands, rather than being a direct target of selection itself. This study demonstrates how a truly multivariate treatment of color data can reveal evolutionary patterns that might otherwise go unnoticed.
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Affiliation(s)
- Chad M Eliason
- Grainger Bioinformatics Center, Field Museum of Natural History, Chicago, United States
- Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, United States
| | - Jenna M McCullough
- Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, United States
| | - Shannon J Hackett
- Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, United States
| | - Michael J Andersen
- Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, United States
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3
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Terrill RS, Shultz AJ. Feather function and the evolution of birds. Biol Rev Camb Philos Soc 2023; 98:540-566. [PMID: 36424880 DOI: 10.1111/brv.12918] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 10/27/2022] [Accepted: 10/31/2022] [Indexed: 11/26/2022]
Abstract
The ability of feathers to perform many functions either simultaneously or at different times throughout the year or life of a bird is integral to the evolutionary history of birds. Many studies focus on single functions of feathers, but any given feather performs many functions over its lifetime. These functions necessarily interact with each other throughout the evolution and development of birds, so our knowledge of avian evolution is incomplete without understanding the multifunctionality of feathers, and how different functions may act synergistically or antagonistically during natural selection. Here, we review how feather functions interact with avian evolution, with a focus on recent technological and discovery-based advances. By synthesising research into feather functions over hierarchical scales (pattern, arrangement, macrostructure, microstructure, nanostructure, molecules), we aim to provide a broad context for how the adaptability and multifunctionality of feathers have allowed birds to diversify into an astounding array of environments and life-history strategies. We suggest that future research into avian evolution involving feather function should consider multiple aspects of a feather, including multiple functions, seasonal wear and renewal, and ecological or mechanical interactions. With this more holistic view, processes such as the evolution of avian coloration and flight can be understood in a broader and more nuanced context.
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Affiliation(s)
- Ryan S Terrill
- Moore Laboratory of Zoology, Occidental College, 1600 Campus rd., Los Angeles, CA, 90042, USA
- Department of Biological Sciences, California State University, Stanislaus, Turlock, CA, 95382, USA
| | - Allison J Shultz
- Ornithology Department, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA, 90007, USA
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4
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Lu CW, Huang ST, Cheng SJ, Lin CT, Hsu YC, Yao CT, Dong F, Hung CM, Kuo HC. Genomic architecture underlying morphological and physiological adaptation to high elevation in a songbird. Mol Ecol 2023; 32:2234-2251. [PMID: 36748940 DOI: 10.1111/mec.16875] [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: 11/04/2022] [Revised: 01/17/2023] [Accepted: 02/03/2023] [Indexed: 02/08/2023]
Abstract
Organisms often acquire physiological and morphological modifications to conquer ecological challenges when colonizing new environments which lead to their adaptive evolution. However, deciphering the genomic mechanism of ecological adaptation is difficult because ecological environments are often too complex for straightforward interpretation. Thus, we examined the adaptation of a widespread songbird-the rufous-capped babbler (Cyanoderma ruficeps)-to a relatively simple system: distinct environments across elevational gradients on the mountainous island of Taiwan. We focused on the genomic sequences of 43 birds from five populations to show that the Taiwan group split from its sister group in mainland China around 1-2 million years ago (Ma) and colonized the montane habitats of Taiwan at least twice around 0.03-0.22 Ma. The montane and lowland Taiwan populations diverged with gene flow between them, suggesting strong selection associated with different elevations. We found that the montane babblers had smaller beaks than the lowland ones, consistent with Allen's rule, and identified candidate genes-COL9A1 and SOX11-underlying the beak size changes. We also found that altitudinally divergent mutations were mostly located in noncoding regions and tended to accumulate in chromosomal inversions and autosomes. The altitudinally divergent mutations might regulate genes related to haematopoietic, metabolic, immune, auditory and vision functions, as well as cerebrum morphology and plumage development. The results reveal the genomic bases of morphological and physiological adaptation in this species to the low temperature, hypoxia and high UV light environment at high elevation. These findings improve our understanding of how ecological adaptation drives population divergence from the perspective of genomic architecture.
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Affiliation(s)
- Chia-Wei Lu
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Shih-Ting Huang
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Shun-Jen Cheng
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien, Taiwan
| | - Chen-Tau Lin
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Yu-Cheng Hsu
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien, Taiwan
| | - Cheng-Te Yao
- Division of Zoology, Endemic Species Research Institute, Nantou, Taiwan
| | - Feng Dong
- Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
| | - Chih-Ming Hung
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Hao-Chih Kuo
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
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5
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Ospina-Rozo L, Roberts A, Stuart-Fox D. A generalized approach to characterize optical properties of natural objects. Biol J Linn Soc Lond 2022. [DOI: 10.1093/biolinnean/blac064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
To understand the diversity of ways in which natural materials interact with light, it is important to consider how their reflectance changes with the angle of illumination or viewing and to consider wavelengths beyond the visible. Efforts to characterize these optical properties, however, have been hampered by heterogeneity in measurement techniques, parameters and terminology. Here, we propose a standardized set of measurements, parameters and terminology to describe the optical properties of natural objects based on spectrometry, including angle-dependent effects, such as iridescence and specularity. We select a set of existing measurements and parameters that are generalizable to any wavelength range and spectral shape, and we highlight which subsets of measures are relevant to different biological questions. As a case study, we have applied these measures to 30 species of Christmas beetles, in which we observed previously unrealized diversity in visible and near-infrared reflectance. As expected, reflection of short wavelengths was associated with high spectral purity and angle dependence. In contrast to simple, artificial structures, iridescence and specularity were not strongly correlated, highlighting the complexity and modularity of natural materials. Species did not cluster according to spectral parameters or genus, suggesting high lability of optical properties. The proposed standardization of measures and parameters will improve our understanding of biological adaptations for manipulating light by facilitating the systematic comparison of complex optical properties, such as glossy or metallic appearances and visible or near-infrared iridescence.
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Affiliation(s)
- Laura Ospina-Rozo
- School of Biosciences, University of Melbourne , VIC 3010 , Australia
| | - Ann Roberts
- ARC Centre of Excellence for Transformative Meta-Optical Systems, School of Physics, University of Melbourne , VIC 3010 , Australia
| | - Devi Stuart-Fox
- School of Biosciences, University of Melbourne , VIC 3010 , Australia
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6
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Fleishman LJ, Perez-Martinez CA, Leal M. Can sensory drive explain the evolution of visual signal diversity in terrestrial species? A test with Anolis lizards. Am Nat 2022; 200:236-249. [DOI: 10.1086/720267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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7
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Rubenstein DR, Corvelo A, MacManes MD, Maia R, Narzisi G, Rousaki A, Vandenabeele P, Shawkey MD, Solomon J. Feather Gene Expression Elucidates the Developmental Basis of Plumage Iridescence in African Starlings. J Hered 2021; 112:417-429. [PMID: 33885791 DOI: 10.1093/jhered/esab014] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 03/19/2021] [Indexed: 01/08/2023] Open
Abstract
Iridescence is widespread in the living world, occurring in organisms as diverse as bacteria, plants, and animals. Yet, compared to pigment-based forms of coloration, we know surprisingly little about the developmental and molecular bases of the structural colors that give rise to iridescence. Birds display a rich diversity of iridescent structural colors that are produced in feathers by the arrangement of melanin-containing organelles called melanosomes into nanoscale configurations, but how these often unusually shaped melanosomes form, or how they are arranged into highly organized nanostructures, remains largely unknown. Here, we use functional genomics to explore the developmental basis of iridescent plumage using superb starlings (Lamprotornis superbus), which produce both iridescent blue and non-iridescent red feathers. Through morphological and chemical analyses, we confirm that hollow, flattened melanosomes in iridescent feathers are eumelanin-based, whereas melanosomes in non-iridescent feathers are solid and amorphous, suggesting that high pheomelanin content underlies red coloration. Intriguingly, the nanoscale arrangement of melanosomes within the barbules was surprisingly similar between feather types. After creating a new genome assembly, we use transcriptomics to show that non-iridescent feather development is associated with genes related to pigmentation, metabolism, and mitochondrial function, suggesting non-iridescent feathers are more energetically expensive to produce than iridescent feathers. However, iridescent feather development is associated with genes related to structural and cellular organization, suggesting that, while nanostructures themselves may passively assemble, barbules and melanosomes may require active organization to give them their shape. Together, our analyses suggest that iridescent feathers form through a combination of passive self-assembly and active processes.
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Affiliation(s)
- Dustin R Rubenstein
- Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY
- Center for Integrative Animal Behavior, Columbia University, New York, NY
| | | | - Matthew D MacManes
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH
| | - Rafael Maia
- Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY
| | | | - Anastasia Rousaki
- Raman Spectroscopy Research Group, Department of Chemistry, Ghent University, Krigslaan, Ghent, Belgium
| | - Peter Vandenabeele
- Raman Spectroscopy Research Group, Department of Chemistry, Ghent University, Krigslaan, Ghent, Belgium
- Archaeometry Research Group, Department of Archaeology, Ghent University, Sint-Pietersnieuwstraat, Ghent, Belgium
| | - Matthew D Shawkey
- Evolution and Optics of Nanostructures Group, Department of Biology, Ghent University, Ghent, Belgium
| | - Joseph Solomon
- Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY
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8
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Beltrán DF, Shultz AJ, Parra JL. Speciation rates are positively correlated with the rate of plumage color evolution in hummingbirds. Evolution 2021; 75:1665-1680. [PMID: 34037257 DOI: 10.1111/evo.14277] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 04/28/2021] [Accepted: 04/29/2021] [Indexed: 12/13/2022]
Abstract
A fascinating pattern in nature is the uneven distribution of biodiversity among clades, some with low species richness and phenotypic variation in contrast to others with remarkable species richness and phenotypic diversity. In animals, communication signals are crucial for intra- and interspecific interactions and are likely an important factor in speciation. However, evidence for the association between the evolution of such signals and speciation is mixed. In hummingbirds, plumage coloration is an important communication signal, particularly for mate selection. Here, using reflectance data for 237 hummingbird species (∼66% of total diversity), we demonstrate that color evolution rates are associated with speciation rates, and that differences among feather patches are consistent with an interplay between natural and sexual selection. We found that female color evolution rates of multiple plumage elements, including the gorget, were similar to those of males. Although male color evolution in this patch was associated with speciation, female gorget color evolution was not. In other patches, the relationship between speciation and color evolution rates was pervasive between sexes. We anticipate that future studies on animal communication will likely find that evolution of signaling traits of both sexes has played a vital role in generating signal and species diversity.
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Affiliation(s)
- Diego F Beltrán
- Instituto de Biología, Universidad de Antioquia, Medellín, 050010, Colombia.,Department of Biology, University of Washington, Seattle, Washington, 98195, USA
| | - Allison J Shultz
- Ornithology Department, Natural History Museum of Los Angeles County, Los Angeles, California, 90007, USA
| | - Juan L Parra
- Instituto de Biología, Universidad de Antioquia, Medellín, 050010, Colombia
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9
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Marcondes RS, Nations JA, Seeholzer GF, Brumfield RT. Rethinking Gloger's Rule: Climate, Light Environments, and Color in a Large Family of Tropical Birds (Furnariidae). Am Nat 2021; 197:592-606. [PMID: 33908827 DOI: 10.1086/713386] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractEcogeographic rules provide a framework within which to test evolutionary hypotheses of adaptation. Gloger's rule predicts that endothermic animals should have darker colors in warm/rainy climates. This rule also predicts that animals should be more rufous in warm/dry climates, the so-called complex Gloger's rule. Empirical studies frequently demonstrate that animals are darker in cool/wet climates rather than in warm/wet climates. Furthermore, sensory ecology predicts that, to enhance crypsis, animals should be darker in darker light environments. We aimed to disentangle the effects of climate and light environments on plumage color in the large Neotropical passerine family Furnariidae. We found that birds in cooler and rainier climates had darker plumage even after controlling for habitat type. Birds in darker habitats had darker plumage even after controlling for climate. The effects of temperature and precipitation interact so that the negative effect of precipitation on brightness is strongest in cool temperatures. Finally, birds tended to be more rufous in warm/dry habitats but also, surprisingly, in cool/wet locales. We suggest that Gloger's rule results from complementary selective pressures arising from myriad ecological factors, including crypsis, thermoregulation, parasite deterrence, and resistance to feather abrasion.
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10
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Dhillon MK, Tanwar AK, Hasan F, Bhadauriya AS. Phenotypic variation in adults of
Chilo
partellus
(Swinhoe) from diverse ecological regions of India. ACTA ZOOL-STOCKHOLM 2021. [DOI: 10.1111/azo.12377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mukesh K. Dhillon
- Division of Entomology ICAR‐Indian Agricultural Research Institute New Delhi India
| | - Aditya K. Tanwar
- Division of Entomology ICAR‐Indian Agricultural Research Institute New Delhi India
| | - Fazil Hasan
- Division of Entomology ICAR‐Indian Agricultural Research Institute New Delhi India
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11
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van der Bijl W, Zeuss D, Chazot N, Tunström K, Wahlberg N, Wiklund C, Fitzpatrick JL, Wheat CW. Butterfly dichromatism primarily evolved via Darwin's, not Wallace's, model. Evol Lett 2020; 4:545-555. [PMID: 33312689 PMCID: PMC7719551 DOI: 10.1002/evl3.199] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 09/27/2020] [Accepted: 10/04/2020] [Indexed: 01/20/2023] Open
Abstract
Sexual dimorphism is typically thought to result from sexual selection for elaborated male traits, as proposed by Darwin. However, natural selection could reduce expression of elaborated traits in females, as proposed by Wallace. Darwin and Wallace debated the origins of dichromatism in birds and butterflies, and although evidence in birds is roughly equal, if not in favor of Wallace's model, butterflies lack a similar scale of study. Here, we present a large‐scale comparative phylogenetic analysis of the evolution of butterfly coloration, using all European non‐hesperiid butterfly species (n = 369). We modeled evolutionary changes in coloration for each species and sex along their phylogeny, thereby estimating the rate and direction of evolution in three‐dimensional color space using a novel implementation of phylogenetic ridge regression. We show that male coloration evolved faster than female coloration, especially in strongly dichromatic clades, with male contribution to changes in dichromatism roughly twice that of females. These patterns are consistent with a classic Darwinian model of dichromatism via sexual selection on male coloration, suggesting this model was the dominant driver of dichromatism in European butterflies.
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Affiliation(s)
- Wouter van der Bijl
- Department of Zoology Stockholm University Stockholm SE-10691 Sweden.,Department of Zoology University of British Columbia Vancouver BC V6T 1Z4 Canada
| | - Dirk Zeuss
- Department of Zoology Stockholm University Stockholm SE-10691 Sweden.,Department of Environmental Informatics Philipps-University of Marburg Marburg DE-35032 Germany
| | - Nicolas Chazot
- Department of Biology University of Lund Lund SE-22362 Sweden.,Department of Ecology Swedish University of Agricultural Sciences Uppsala SE-75007 Sweden
| | - Kalle Tunström
- Department of Zoology Stockholm University Stockholm SE-10691 Sweden
| | - Niklas Wahlberg
- Department of Biology University of Lund Lund SE-22362 Sweden
| | - Christer Wiklund
- Department of Zoology Stockholm University Stockholm SE-10691 Sweden
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12
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Cicero C, Mason NA, Benedict L, Rising JD. Behavioral, morphological, and ecological trait evolution in two clades of New World Sparrows ( Aimophila and Peucaea, Passerellidae). PeerJ 2020; 8:e9249. [PMID: 32596039 PMCID: PMC7307569 DOI: 10.7717/peerj.9249] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 05/07/2020] [Indexed: 12/14/2022] Open
Abstract
The New World sparrows (Passerellidae) are a large, diverse group of songbirds that vary in morphology, behavior, and ecology. Thus, they are excellent for studying trait evolution in a phylogenetic framework. We examined lability versus conservatism in morphological and behavioral traits in two related clades of sparrows (Aimophila, Peucaea), and assessed whether habitat has played an important role in trait evolution. We first inferred a multi-locus phylogeny which we used to reconstruct ancestral states, and then quantified phylogenetic signal among morphological and behavioral traits in these clades and in New World sparrows more broadly. Behavioral traits have a stronger phylogenetic signal than morphological traits. Specifically, vocal duets and song structure are the most highly conserved traits, and nesting behavior appears to be maintained within clades. Furthermore, we found a strong correlation between open habitat and unpatterned plumage, complex song, and ground nesting. However, even within lineages that share the same habitat type, species vary in nesting, plumage pattern, song complexity, and duetting. Our findings highlight trade-offs between behavior, morphology, and ecology in sparrow diversification.
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Affiliation(s)
- Carla Cicero
- Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA, United States of America
| | - Nicholas A Mason
- Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA, United States of America.,Current affiliation: Museum of Natural Science and Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana, United States of America
| | - Lauryn Benedict
- School of Biological Sciences, University of Northern Colorado, Greeley, CO, United States of America
| | - James D Rising
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
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13
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Trade-off Between Thermal Quality and Predation Risk at Timber Rattlesnake Gestation Sites. J HERPETOL 2020. [DOI: 10.1670/18-073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Montejo‐Kovacevich G, Smith JE, Meier JI, Bacquet CN, Whiltshire‐Romero E, Nadeau NJ, Jiggins CD. Altitude and life-history shape the evolution of Heliconius wings. Evolution 2019; 73:2436-2450. [PMID: 31631338 PMCID: PMC6916360 DOI: 10.1111/evo.13865] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 10/15/2019] [Indexed: 01/04/2023]
Abstract
Phenotypic divergence between closely related species has long interested biologists. Taxa that inhabit a range of environments and have diverse natural histories can help understand how selection drives phenotypic divergence. In butterflies, wing color patterns have been extensively studied but diversity in wing shape and size is less well understood. Here, we assess the relative importance of phylogenetic relatedness, natural history, and habitat on shaping wing morphology in a large dataset of over 3500 individuals, representing 13 Heliconius species from across the Neotropics. We find that both larval and adult behavioral ecology correlate with patterns of wing sexual dimorphism and adult size. Species with solitary larvae have larger adult males, in contrast to gregarious Heliconius species, and indeed most Lepidoptera, where females are larger. Species in the pupal-mating clade are smaller than those in the adult-mating clade. Interestingly, we find that high-altitude species tend to have rounder wings and, in one of the two major Heliconius clades, are also bigger than their lowland relatives. Furthermore, within two widespread species, we find that high-altitude populations also have rounder wings. Thus, we reveal novel adaptive wing morphological divergence among Heliconius species beyond that imposed by natural selection on aposematic wing coloration.
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Affiliation(s)
| | | | - Joana I. Meier
- St John's CollegeUniversity of CambridgeCambridgeCB2 1TP
| | | | | | - Nicola J. Nadeau
- Animal and Plant SciencesUniversity of SheffieldSheffieldS10 2TNUK
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15
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Javůrková VG, Enbody ED, Kreisinger J, Chmel K, Mrázek J, Karubian J. Plumage iridescence is associated with distinct feather microbiota in a tropical passerine. Sci Rep 2019; 9:12921. [PMID: 31501471 PMCID: PMC6733896 DOI: 10.1038/s41598-019-49220-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 08/21/2019] [Indexed: 12/27/2022] Open
Abstract
Birds present a stunning diversity of plumage colors that have long fascinated evolutionary ecologists. Although plumage coloration is often linked to sexual selection, it may impact a number of physiological processes, including microbial resistance. At present, the degree to which differences between pigment-based vs. structural plumage coloration may affect the feather microbiota remains unanswered. Using quantitative PCR and DGGE profiling, we investigated feather microbial load, diversity and community structure among two allopatric subspecies of White-shouldered Fairywren, Malurus alboscapulatus that vary in expression of melanin-based vs. structural plumage coloration. We found that microbial load tended to be lower and feather microbial diversity was significantly higher in the plumage of black iridescent males, compared to black matte females and brown individuals. Moreover, black iridescent males had distinct feather microbial communities compared to black matte females and brown individuals. We suggest that distinctive nanostructure properties of iridescent male feathers or different investment in preening influence feather microbiota community composition and load. This study is the first to point to structural plumage coloration as a factor that may significantly regulate feather microbiota. Future work might explore fitness consequences and the role of microorganisms in the evolution of avian sexual dichromatism, with particular reference to iridescence.
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Affiliation(s)
- Veronika Gvoždíková Javůrková
- Faculty of Agrobiology, Food and Natural Resources, Department of Animal Science, Czech University of Life Sciences, Kamýcká 129, 165 00, Prague, Suchdol, Czech Republic.
- Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 65, Brno, Czech Republic.
| | - Erik D Enbody
- Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA, USA
| | - Jakub Kreisinger
- Faculty of Science, Department of Zoology, Charles University, Viničná 7, 128 44, Prague, Czech Republic
| | - Kryštof Chmel
- Faculty of Science, Department of Zoology, Charles University, Viničná 7, 128 44, Prague, Czech Republic
- Faculty of Science, Department of Zoology, University of South Bohemia, Branišovská 1760, 370 05, České Budějovice, Czech Republic
| | - Jakub Mrázek
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Vídeňská 1083, 160 00, Prague-Krč, Czech Republic
| | - Jordan Karubian
- Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA, USA
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16
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Lin 林宇恆 YH, Chan 詹仕凡 SF, Rubenstein DR, Liu 劉彥廷 M, Shen 沈聖峰 SF. Resolving the Paradox of Environmental Quality and Sociality: The Ecological Causes and Consequences of Cooperative Breeding in Two Lineages of Birds. Am Nat 2019; 194:207-216. [PMID: 31318278 DOI: 10.1086/704090] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Cooperatively breeding animals occur in virtually every ecosystem on earth. Comparative and biogeographic studies suggest that both benign and harsh-as well as stable and fluctuating-environments can favor the evolution of cooperative breeding behavior. The fact that cooperative societies occur in environments of such contrasting quality creates a paradox of environmental quality and sociality. The dual benefits framework-which leads to the prediction that the ecological consequences of sociality (e.g., range size) vary depending on the benefits that individuals of each species receive by forming social groups-offers a potential resolution to this paradox. Here we use a case study of two avian lineages, starlings (Sturnidae) and hornbills (Bucerotidae), in which environmental unpredictability appears to have opposite effects on the evolution of cooperation to test the dual benefits framework. Consistent with previous work, harsh and unpredictable environments promote cooperative breeding behavior in starlings, which in turn leads to larger geographic ranges. However, cooperatively breeding hornbills occur in benign and stable environments, but sociality does not influence range size. Our study suggests that the paradox of environmental quality and sociality arises largely because cooperative breeding is an umbrella term encompassing social species that form groups for different reasons. We demonstrate that differentiating among the functional causes of social group formation is critical for developing a predictive framework for understanding the evolution of cooperative breeding behavior.
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17
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Miles MC, Fuxjager MJ. Phenotypic Diversity Arises from Secondary Signal Loss in the Elaborate Visual Displays of Toucans and Barbets. Am Nat 2019; 194:152-167. [PMID: 31318292 DOI: 10.1086/704088] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Complexity and diversity are fundamental characteristics of life, but the relationship between the two remains murky. For example, both gaining and losing complexity can support diversity-so how exactly does complexity influence the emergence of unique phenotypes? Here we address this question by examining how complexity underlies the diversity of elaborate visual displays in the avian clade Ramphastides (toucans and barbets). These species communicate in part by using body movement and colorful ornaments on the tail. We find that sexual size dimorphism predicts the evolution of one specific signal, the tail-cock gesture, implying that tail cocking is more likely to evolve under stronger sexual selection. We also discover process-level constraints on the evolution of complexity: signals are gained along a strict order of operations, where the tail-cock gesture arises before other colors and gestures. Yet virtually any signal can be lost at any time. As a result, many extant phenotypes were more likely to arise through loss of complexity, highlighting the importance of secondary signal loss to phenotypic diversity. Collectively, our results demonstrate how sexual selection catalyzes the evolution of complex phenotypes, which indirectly support diversity by allowing different traits to be modified or lost in the future.
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18
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Sexual selection predicts the rate and direction of colour divergence in a large avian radiation. Nat Commun 2019; 10:1773. [PMID: 30992444 PMCID: PMC6467902 DOI: 10.1038/s41467-019-09859-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 04/02/2019] [Indexed: 12/31/2022] Open
Abstract
Sexual selection is proposed to be a powerful driver of phenotypic evolution in animal systems. At macroevolutionary scales, sexual selection can theoretically drive both the rate and direction of phenotypic evolution, but this hypothesis remains contentious. Here, we find that differences in the rate and direction of plumage colour evolution are predicted by a proxy for sexual selection intensity (plumage dichromatism) in a large radiation of suboscine passerine birds (Tyrannida). We show that rates of plumage evolution are correlated between the sexes, but that sexual selection has a strong positive effect on male, but not female, interspecific divergence rates. Furthermore, we demonstrate that rapid male plumage divergence is biased towards carotenoid-based (red/yellow) colours widely assumed to represent honest sexual signals. Our results highlight the central role of sexual selection in driving avian colour divergence, and reveal the existence of convergent evolutionary responses of animal signalling traits under sexual selection. What factors explain variation in the pace and trajectory of evolutionary divergence between lineages? Here, the authors show that a proxy measure for sexual selection intensity predicts both the rate and direction of plumage colour evolution in a diverse radiation of New World passerine birds.
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19
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Janicke T, Ritchie MG, Morrow EH, Marie-Orleach L. Sexual selection predicts species richness across the animal kingdom. Proc Biol Sci 2019; 285:rspb.2018.0173. [PMID: 29720412 DOI: 10.1098/rspb.2018.0173] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/10/2018] [Indexed: 12/13/2022] Open
Abstract
Our improving knowledge of the animal tree of life consistently demonstrates that some taxa diversify more rapidly than others, but what contributes to this variation remains poorly understood. An influential hypothesis proposes that selection arising from competition for mating partners plays a key role in promoting speciation. However, empirical evidence showing a link between proxies of this sexual selection and species richness is equivocal. Here, we collected standardized metrics of sexual selection for a broad range of animal taxa, and found that taxonomic families characterized by stronger sexual selection on males show relatively higher species richness. Thus, our data support the hypothesis that sexual selection elevates species richness. This could occur either by promoting speciation and/or by protecting species against extinction.
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Affiliation(s)
- Tim Janicke
- Evolution, Behaviour and Environment Group, School of Life Sciences, University of Sussex, Brighton, UK.,Centre d'Écologie Fonctionnelle et Évolutive, UMR 5175, CNRS, Université de Montpellier, Université Paul-Valéry Montpellier, École Pratique des Hautes Études, 34090 Montpellier, France
| | - Michael G Ritchie
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews, UK
| | - Edward H Morrow
- Evolution, Behaviour and Environment Group, School of Life Sciences, University of Sussex, Brighton, UK
| | - Lucas Marie-Orleach
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews, UK
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20
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Marcondes RS, Brumfield RT. Fifty shades of brown: Macroevolution of plumage brightness in the Furnariida, a large clade of drab Neotropical passerines. Evolution 2019; 73:704-719. [DOI: 10.1111/evo.13707] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 02/14/2019] [Indexed: 01/06/2023]
Affiliation(s)
- Rafael S. Marcondes
- Museum of Natural Science and Department of Biological Sciences Louisiana State University Baton Rouge Louisiana 70803
| | - Robb T. Brumfield
- Museum of Natural Science and Department of Biological Sciences Louisiana State University Baton Rouge Louisiana 70803
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21
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Eliason CM, Andersen MJ, Hackett SJ. Using Historical Biogeography Models to Study Color Pattern Evolution. Syst Biol 2019; 68:755-766. [DOI: 10.1093/sysbio/syz012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 02/11/2019] [Accepted: 02/14/2019] [Indexed: 11/14/2022] Open
Abstract
Abstract
Color is among the most striking features of organisms, varying not only in spectral properties like hue and brightness, but also in where and how it is produced on the body. Different combinations of colors on a bird’s body are important in both environmental and social contexts. Previous comparative studies have treated plumage patches individually or derived plumage complexity scores from color measurements across a bird’s body. However, these approaches do not consider the multivariate nature of plumages (allowing for plumage to evolve as a whole) or account for interpatch distances. Here, we leverage a rich toolkit used in historical biogeography to assess color pattern evolution in a cosmopolitan radiation of birds, kingfishers (Aves: Alcedinidae). We demonstrate the utility of this approach and test hypotheses about the tempo and mode of color evolution in kingfishers. Our results highlight the importance of considering interpatch distances in understanding macroevolutionary trends in color diversity and demonstrate how historical biogeography models are a useful way to model plumage color pattern evolution. Furthermore, they show that distinct color mechanisms (pigments or structural colors) spread across the body in different ways and at different rates. Specifically, net rates are higher for structural colors than pigment-based colors. Together, our study suggests a role for both development and selection in driving extraordinary color pattern diversity in kingfishers. We anticipate this approach will be useful for modeling other complex phenotypes besides color, such as parasite evolution across the body.
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Affiliation(s)
- Chad M Eliason
- Integrative Research Center, Field Museum of Natural History, Chicago, IL, USA
| | - Michael J Andersen
- Department of Biology and Museum of Southwestern Biology, University of New Mexico, Albuquerque, NM, USA
| | - Shannon J Hackett
- Integrative Research Center, Field Museum of Natural History, Chicago, IL, USA
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22
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Gruson H, Andraud C, Daney de Marcillac W, Berthier S, Elias M, Gomez D. Quantitative characterization of iridescent colours in biological studies: a novel method using optical theory. Interface Focus 2018; 9:20180049. [PMID: 30603069 DOI: 10.1098/rsfs.2018.0049] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2018] [Indexed: 11/12/2022] Open
Abstract
Iridescent colours are colours that change with viewing or illumination geometry. While they are widespread in many living organisms, most evolutionary studies on iridescence do not take into account their full complexity. Few studies try to precisely characterize what makes iridescent colours special: their angular dependency. Yet, it is likely that this angular dependency has biological functions and is therefore submitted to evolutionary pressures. For this reason, evolutionary biologists need a repeatable method to measure iridescent colours as well as variables to precisely quantify the angular dependency. In this study, we use a theoretical approach to propose five variables that allow one to fully describe iridescent colours at every angle combination. Based on the results, we propose a new measurement protocol and statistical method to reliably characterize iridescence while minimizing the required number of time-consuming measurements. We use hummingbird iridescent feathers and butterfly iridescent wings as test cases to demonstrate the strengths of this new method. We show that our method is precise enough to be potentially used at intraspecific level while being also time-efficient enough to encompass large taxonomic scales.
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Affiliation(s)
- Hugo Gruson
- CEFE, Univ Montpellier, CNRS, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France
| | - Christine Andraud
- CRC, MNHN, Ministère de la Culture et de la Communication, CNRS, Paris, France
| | | | | | - Marianne Elias
- ISYEB, CNRS, MNHN, EPHE, Sorbonne Université, Paris, France
| | - Doris Gomez
- CEFE, Univ Montpellier, CNRS, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France.,INSP, Sorbonne Université, CNRS, Paris, France
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23
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Cummings ME, Endler JA. 25 Years of sensory drive: the evidence and its watery bias. Curr Zool 2018; 64:471-484. [PMID: 30108628 PMCID: PMC6084598 DOI: 10.1093/cz/zoy043] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 05/18/2018] [Indexed: 12/27/2022] Open
Abstract
It has been 25 years since the formalization of the Sensory Drive hypothesis was published in the American Naturalist (1992). Since then, there has been an explosion of research identifying its utility in contributing to our understanding of inter- and intra-specific variation in sensory systems and signaling properties. The main tenet of Sensory Drive is that environmental characteristics will influence the evolutionary trajectory of both sensory (detecting capabilities) and signaling (detectable features and behaviors) traits in predictable directions. We review the accumulating evidence in 154 studies addressing these questions and categorized their approach in terms of testing for environmental influence on sensory tuning, signal characteristics, or both. For the subset of studies that examined sensory tuning, there was greater support for Sensory Drive processes shaping visual than auditory tuning, and it was more prevalent in aquatic than terrestrial habitats. Terrestrial habitats and visual traits were the prevalent habitat and sensory modality in the 104 studies showing support for environmental influence on signaling properties. An additional 19 studies that found no supporting evidence for environmental influence on signaling traits were all based in terrestrial ecosystems and almost exclusively involved auditory signals. Only 29 studies examined the complete coevolutionary process between sensory and signaling traits and were dominated by fish visual communication. We discuss biophysical factors that may contribute to the visual and aquatic bias for Sensory Drive evidence, as well as biotic factors that may contribute to the lack of Sensory Drive processes in terrestrial acoustic signaling systems.
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Affiliation(s)
- Molly E Cummings
- Department of Integrative Biology, University of Texas, Austin, TX, USA
| | - John A Endler
- School of Life and Environmental Sciences, Deakin University, Waurn Ponds, VIC, Australia
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24
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Miles MC, Fuxjager MJ. Synergistic selection regimens drive the evolution of display complexity in birds of paradise. J Anim Ecol 2018; 87:1149-1159. [PMID: 29637997 DOI: 10.1111/1365-2656.12824] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 01/10/2018] [Indexed: 12/19/2022]
Abstract
Integrated visual displays that combine gesture with colour are nearly ubiquitous in the animal world, where they are shaped by sexual selection for their role in courtship and competition. However, few studies assess how multiple selection regimens operate on different components of these complex phenotypes on a macroevolutionary scale. Here, we study this issue by assessing how both sexual and ecological selection work together to influence visual display complexity in the birds of paradise. We first find that sexual dichromatism is highest in lekking species, which undergo more intense sexual selection by female choice, than non-lekking species. At the same time, species in which males directly compete with one another at communal display courts have more carotenoid-based ornaments and fewer melanin ornaments. Meanwhile, display habitat influences gestural complexity. Species that dance in the cluttered understorey have more complex dances than canopy-displaying species. Taken together, our results illustrate how distinct selection regimens each operate on individual elements comprising a complex display. This supports a modular model of display evolution, wherein the ultimate integrated display is the product of synergy between multiple factors that select for different types of phenotypic complexity.
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Affiliation(s)
- Meredith C Miles
- Department of Biology, Wake Forest University, Winston-Salem, NC, USA
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25
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Lucas LK, Nice CC, Gompert Z. Genetic constraints on wing pattern variation in
Lycaeides
butterflies: A case study on mapping complex, multifaceted traits in structured populations. Mol Ecol Resour 2018. [DOI: 10.1111/1755-0998.12777] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | - Chris C. Nice
- Department of Biology Texas State University San Marcos TX USA
| | - Zachariah Gompert
- Department of Biology Utah State University Logan UT USA
- Ecology Center Utah State University Logan UT USA
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26
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Affiliation(s)
- Rafael Maia
- Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY, USA
| | - Thomas E White
- School of Life and Environmental Sciences, University of Sydney, Camperdown, Sydney, NSW, Australia
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27
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Shultz AJ, Burns KJ. The role of sexual and natural selection in shaping patterns of sexual dichromatism in the largest family of songbirds (Aves: Thraupidae). Evolution 2017; 71:1061-1074. [DOI: 10.1111/evo.13196] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 01/25/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Allison J. Shultz
- Department of Biology San Diego State University 5500 Campanile Drive San Diego California 92182
- Department of Organismic and Evolutionary Biology Harvard University 26 Oxford Street Cambridge Massachusetts 02138
| | - Kevin J. Burns
- Department of Biology San Diego State University 5500 Campanile Drive San Diego California 92182
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28
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Delhey K, Peters A. The effect of colour‐producing mechanisms on plumage sexual dichromatism in passerines and parrots. Funct Ecol 2016. [DOI: 10.1111/1365-2435.12796] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kaspar Delhey
- School of Biological Sciences Monash University 25 Rainforest walk Melbourne VIC3800 Australia
- Max Planck Institute for Ornithology RadolfzellD‐78315 Germany
| | - Anne Peters
- School of Biological Sciences Monash University 25 Rainforest walk Melbourne VIC3800 Australia
- Max Planck Institute for Ornithology RadolfzellD‐78315 Germany
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29
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Ligon RA, Simpson RK, Mason NA, Hill GE, McGraw KJ. Evolutionary innovation and diversification of carotenoid‐based pigmentation in finches. Evolution 2016; 70:2839-2852. [DOI: 10.1111/evo.13093] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 10/03/2016] [Accepted: 10/08/2016] [Indexed: 11/30/2022]
Affiliation(s)
- Russell A. Ligon
- School of Life Sciences Arizona State University Tempe Arizona 85287
- Laboratory of Ornithology Cornell University Ithaca New York 14850
| | | | - Nicholas A. Mason
- Laboratory of Ornithology Cornell University Ithaca New York 14850
- Department of Ecology and Evolutionary Biology Cornell University Ithaca New York 14853
| | - Geoffrey E. Hill
- Department of Biological Sciences Auburn University Auburn Alabama 36849
| | - Kevin J. McGraw
- School of Life Sciences Arizona State University Tempe Arizona 85287
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30
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Rubalcaba JG, Polo V, Maia R, Rubenstein DR, Veiga JP. Sexual and natural selection in the evolution of extended phenotypes: the use of green nesting material in starlings. J Evol Biol 2016; 29:1585-92. [DOI: 10.1111/jeb.12893] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Accepted: 05/04/2016] [Indexed: 11/29/2022]
Affiliation(s)
- J. G. Rubalcaba
- Departamento de Biología, Geología, Física y Química Inorgánica; Área de Biodiversidad y Conservación; Universidad Rey Juan Carlos; Móstoles Madrid Spain
| | - V. Polo
- Departamento de Biología, Geología, Física y Química Inorgánica; Área de Biodiversidad y Conservación; Universidad Rey Juan Carlos; Móstoles Madrid Spain
| | - R. Maia
- Department of Ecology; Evolution and Environmental Biology; Columbia University; New York NY USA
| | - D. R. Rubenstein
- Department of Ecology; Evolution and Environmental Biology; Columbia University; New York NY USA
| | - J. P. Veiga
- Departamento de Ecología Evolutiva; Museo Nacional de Ciencias Naturales; CSIC; Madrid Spain
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