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Lecocq de Pletincx N, Cerdà X, Kiran K, Karaman C, Taheri A, Aron S. Ecological diversification preceded geographical expansion during the evolutionary radiation of Cataglyphis desert ants. iScience 2024; 27:109852. [PMID: 38779477 PMCID: PMC11109030 DOI: 10.1016/j.isci.2024.109852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 03/20/2024] [Accepted: 04/26/2024] [Indexed: 05/25/2024] Open
Abstract
Biological diversity often arises as organisms adapt to new ecological conditions (i.e., ecological opportunities) or colonize suitable areas (i.e., spatial opportunities). Cases of geographical expansion followed by local ecological divergence are well described; they result in clades comprising ecologically heterogeneous subclades. Here, we show that the desert ant genus Cataglyphis likely originated in open grassland habitats in the Middle East ∼18 million years ago and became a taxon of diverse species specializing in prey of different masses. The genus then colonized the Mediterranean Basin around 9 million years ago. The result was the rapid accumulation of species, and the appearance of local assemblages containing species from different lineages that still displayed ancestral foraging specialties. These findings highlight that, in Cataglyphis, ecological diversification preceded geographical expansion, resulting in a clade composed of ecologically homogeneous subclades.
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Affiliation(s)
- Nathan Lecocq de Pletincx
- Evolutionary Biology and Ecology, Faculty of Sciences, Université Libre de Bruxelles, CP 160/12, av. FD Roosevelt, 1050 Brussels, Belgium
| | - Xim Cerdà
- Department of Ethology and Biodiversity Conservation, Estación Biológica de Doñana, CSIC, Sevilla, Spain
| | - Kadri Kiran
- Department of Biology, Faculty of Sciences, Trakya University, Edirne 22030, Türkiye
| | - Celal Karaman
- Department of Biology, Faculty of Sciences, Trakya University, Edirne 22030, Türkiye
| | - Ahmed Taheri
- Laboratory of Plant Biotechnology, Ecology and Ecosystem Valorization, Faculty of Sciences of El Jadida, University Chouaïb Doukkali, El Jadida, Morocco
| | - Serge Aron
- Evolutionary Biology and Ecology, Faculty of Sciences, Université Libre de Bruxelles, CP 160/12, av. FD Roosevelt, 1050 Brussels, Belgium
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2
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van Holstein LA, Foley RA. Diversity-dependent speciation and extinction in hominins. Nat Ecol Evol 2024; 8:1180-1190. [PMID: 38632435 PMCID: PMC11166571 DOI: 10.1038/s41559-024-02390-z] [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] [Received: 07/08/2022] [Accepted: 03/08/2024] [Indexed: 04/19/2024]
Abstract
The search for drivers of hominin speciation and extinction has tended to focus on the impact of climate change. Far less attention has been paid to the role of interspecific competition. However, research across vertebrates more broadly has shown that both processes are often correlated with species diversity, suggesting an important role for interspecific competition. Here we ask whether hominin speciation and extinction conform to the expected patterns of negative and positive diversity dependence, respectively. We estimate speciation and extinction rates from fossil occurrence data with preservation variability priors in a validated Bayesian framework and test whether these rates are correlated with species diversity. We supplement these analyses with calculations of speciation rate across a phylogeny, again testing whether these are correlated with diversity. Our results are consistent with clade-wide diversity limits that governed speciation in hominins overall but that were not quite reached by the Australopithecus and Paranthropus subclade before its extinction. Extinction was not correlated with species diversity within the Australopithecus and Paranthropus subclade or within hominins overall; this is concordant with climate playing a greater part in hominin extinction than speciation. By contrast, Homo is characterized by positively diversity-dependent speciation and negatively diversity-dependent extinction-both exceedingly rare patterns across all forms of life. The genus Homo expands the set of reported associations between diversity and macroevolution in vertebrates, underscoring that the relationship between diversity and macroevolution is complex. These results indicate an important, previously underappreciated and comparatively unusual role of biotic interactions in Homo macroevolution, and speciation in particular. The unusual and unexpected patterns of diversity dependence in Homo speciation and extinction may be a consequence of repeated Homo range expansions driven by interspecific competition and made possible by recurrent innovations in ecological strategies. Exploring how hominin macroevolution fits into the general vertebrate macroevolutionary landscape has the potential to offer new perspectives on longstanding questions in vertebrate evolution and shed new light on evolutionary processes within our own lineage.
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Affiliation(s)
- Laura A van Holstein
- Leverhulme Centre for Human Evolutionary Studies, Department of Archaeology, University of Cambridge, Cambridge, UK.
| | - Robert A Foley
- Leverhulme Centre for Human Evolutionary Studies, Department of Archaeology, University of Cambridge, Cambridge, UK
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3
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Drury JP, Clavel J, Tobias JA, Rolland J, Sheard C, Morlon H. Limited ecological opportunity influences the tempo of morphological evolution in birds. Curr Biol 2024; 34:661-669.e4. [PMID: 38218182 DOI: 10.1016/j.cub.2023.12.055] [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] [Received: 08/24/2023] [Revised: 11/27/2023] [Accepted: 12/18/2023] [Indexed: 01/15/2024]
Abstract
According to classic models of lineage diversification and adaptive radiation, phenotypic evolution should accelerate in the context of ecological opportunity and slow down when niches become saturated.1,2 However, only weak support for these ideas has been found in nature, perhaps because most analyses make the biologically unrealistic assumption that clade members contribute equally to reducing ecological opportunity, even when they occur in different continents or specialize on different habitats and diets. To view this problem through a different lens, we adapted a new phylogenetic modeling approach that accounts for the fact that competition for ecological opportunity only occurs between species that coexist and share similar habitats and diets. Applying this method to trait data for nearly all extant species of landbirds,3 we find a widespread signature of decelerating trait evolution in lineages adapted to similar habitats or diets. The strength of this pattern was consistent across latitudes when comparing tropical and temperate assemblages. Our results provide little support for the idea that increased diversity and tighter packing of niches accentuates evolutionary slowdowns in the tropics and instead suggest that limited ecological opportunity can be an important factor determining the rate of morphological diversification at a global scale.
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Affiliation(s)
- Jonathan P Drury
- Department of Biosciences, Durham University, Stockton Road, Durham DH1 3LE, UK.
| | - Julien Clavel
- Université Claude Bernard Lyon 1, LEHNA UMR 5023, CNRS, ENTPE, F-69622 Villeurbanne, France
| | - Joseph A Tobias
- Department of Life Sciences, Imperial College London, Ascot SL5 7PY, UK
| | - Jonathan Rolland
- CNRS, UMR5174, Laboratoire Evolution et Diversité Biologique, Université Toulouse 3 Paul Sabatier, Bâtiment 4R1, 118 Route de Narbonne, 31062 Toulouse, France
| | - Catherine Sheard
- School of Earth Sciences, University of Bristol, Bristol BS8 1RL, UK; School of Biological Sciences, University of Aberdeen, Aberdeen AB24 2TZ, UK
| | - Hélène Morlon
- Institut de Biologie - École Normale Supérieure, Université PSL, CNRS, INSERM, 75005 Paris, France
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4
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Guo WJ, Wu Y, He K, Hu YB, Wang XY, Yu WH, Wang XY, Yu WH. Unraveling the macroevolution of horseshoe bats (Chiroptera: Rhinolophidae: Rhinolophus). Zool Res 2023; 44:169-182. [PMID: 36579403 PMCID: PMC9841180 DOI: 10.24272/j.issn.2095-8137.2022.265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Unraveling the diversification mechanisms of organisms is a fundamental and important macroevolutionary question regarding the diversity, ecological niche, and morphological divergence of life. However, many studies have only explored diversification mechanisms via isolated factors. Here, based on comparative phylogenetic analysis, we performed a macroevolutionary examination of horseshoe bats (Chiroptera: Rhinolophidae: Rhinolophus), to reveal the inter-relationships among diversification, intrinsic/extrinsic factors, and climatic ecological niche characteristics. Results showed a general slowing trajectory during diversification, with two dispersal events from Asia into Southeast Asia and Africa playing key roles in shaping regional heterogeneous diversity. Morphospace expansions of the investigated traits (e.g., body size, echolocation, and climate niche) revealed a decoupled pattern between diversification trajectory and trait divergence, suggesting that other factors (e.g., biotic interactions) potentially played a key role in recent diversification. Based on ancestral traits and pathway analyses, most Rhinolophus lineages belonging to the same region overlapped with each other geographically and were positively associated with the diversification rate, implying a competitive prelude to speciation. Overall, our study showed that multiple approaches need to be integrated to address diversification history. Rather than a single factor, the joint effects of multiple factors (biogeography, environmental drivers, and competition) are responsible for the current diversity patterns in horseshoe bats, and a corresponding multifaceted strategy is recommended to study these patterns in the future.
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Affiliation(s)
- Wei-Jian Guo
- Key Laboratory of Conservation and Application in Biodiversity of South China, School of Life Sciences, Guangzhou University, Guangzhou, Guangdong 510000, China
| | - Yi Wu
- Key Laboratory of Conservation and Application in Biodiversity of South China, School of Life Sciences, Guangzhou University, Guangzhou, Guangdong 510000, China
| | - Kai He
- Key Laboratory of Conservation and Application in Biodiversity of South China, School of Life Sciences, Guangzhou University, Guangzhou, Guangdong 510000, China
| | - Yi-Bo Hu
- CAS Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Xiao-Yun Wang
- Key Laboratory of Conservation and Application in Biodiversity of South China, School of Life Sciences, Guangzhou University, Guangzhou, Guangdong 510000, China,E-mail:
| | - Wen-Hua Yu
- Key Laboratory of Conservation and Application in Biodiversity of South China, School of Life Sciences, Guangzhou University, Guangzhou, Guangdong 510000, China,
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5
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Anderson SAS, López-Fernández H, Weir JT. Ecology and the origin of non-ephemeral species. Am Nat 2022; 201:619-638. [PMID: 37130236 DOI: 10.1086/723763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
AbstractResearch over the past three decades has shown that ecology-based extrinsic reproductive barriers can rapidly arise to generate incipient species-but such barriers can also rapidly dissolve when environments change, resulting in incipient species collapse. Understanding the evolution of unconditional, "intrinsic" reproductive barriers is therefore important for understanding the longer-term buildup of biodiversity. In this article, we consider ecology's role in the evolution of intrinsic reproductive isolation. We suggest that this topic has fallen into a gap between disciplines: while evolutionary ecologists have traditionally focused on the rapid evolution of extrinsic isolation between co-occurring ecotypes, speciation geneticists studying intrinsic isolation in other taxa have devoted little attention to the ecological context in which it evolves. We argue that for evolutionary ecology to close this gap, the field will have to expand its focus beyond rapid adaptation and its traditional model systems. Synthesizing data from several subfields, we present circumstantial evidence for and against different forms of ecological adaptation as promoters of intrinsic isolation and discuss alternative forces that may be significant. We conclude by outlining complementary approaches that can better address the role of ecology in the evolution of nonephemeral reproductive barriers and, by extension, less ephemeral species.
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6
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Tavares WC, Coutinho LC, Oliveira JA. Locomotor habits and phenotypic evolution of the appendicular skeleton in the oryzomyalian radiation in the Neotropics (Sigmodontinae, Cricetidae, Rodentia). J ZOOL SYST EVOL RES 2021. [DOI: 10.1111/jzs.12551] [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)
- William Corrêa Tavares
- Núcleo Multidisciplinar de Pesquisa em Biologia—NUMPEX‐BIO Campus Duque de Caxias Professor Geraldo Cidade Universidade Federal do Rio de Janeiro Duque de Caxias Brazil
- Programa de Pós‐Graduação em Biodiversidade e Biologia Evolutiva Instituto de Biologia Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
| | - Ludmilla Carvalho Coutinho
- Programa de Pós‐Graduação em Biodiversidade e Biologia Evolutiva Instituto de Biologia Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
- Setor de Mastozoologia Departamento de Vertebrados Museu Nacional Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
| | - João Alves Oliveira
- Programa de Pós‐Graduação em Biodiversidade e Biologia Evolutiva Instituto de Biologia Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
- Setor de Mastozoologia Departamento de Vertebrados Museu Nacional Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
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7
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Drury JP, Clavel J, Tobias JA, Rolland J, Sheard C, Morlon H. Tempo and mode of morphological evolution are decoupled from latitude in birds. PLoS Biol 2021; 19:e3001270. [PMID: 34428214 PMCID: PMC8384433 DOI: 10.1371/journal.pbio.3001270] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 05/07/2021] [Indexed: 12/17/2022] Open
Abstract
The latitudinal diversity gradient is one of the most striking patterns in nature, yet its implications for morphological evolution are poorly understood. In particular, it has been proposed that an increased intensity of species interactions in tropical biota may either promote or constrain trait evolution, but which of these outcomes predominates remains uncertain. Here, we develop tools for fitting phylogenetic models of phenotypic evolution in which the impact of species interactions-namely, competition-can vary across lineages. Deploying these models on a global avian trait dataset to explore differences in trait divergence between tropical and temperate lineages, we find that the effect of latitude on the mode and tempo of morphological evolution is weak and clade- or trait dependent. Our results indicate that species interactions do not disproportionately impact morphological evolution in tropical bird families and question the validity of previously reported patterns of slower trait evolution in the tropics.
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Affiliation(s)
- Jonathan P. Drury
- Department of Biosciences, Durham University, Durham, United Kingdom
| | - Julien Clavel
- Natural History Museum, London, United Kingdom
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023, LEHNA, Villeurbanne, France
| | - Joseph A. Tobias
- Department of Life Sciences, Imperial College London, Ascot, United Kingdom
| | - Jonathan Rolland
- Zoology Department, University of British Columbia, Vancouver, Canada
| | - Catherine Sheard
- School of Earth Sciences, University of Bristol, Bristol, United Kingdom
| | - Hélène Morlon
- Institut de Biologie, École Normale Supérieure, CNRS UMR 8197, Paris, France
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8
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Vinciguerra NT, Burns KJ. Species diversification and ecomorphological evolution in the radiation of tanagers (Passeriformes: Thraupidae). Biol J Linn Soc Lond 2021. [DOI: 10.1093/biolinnean/blab042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Ecological opportunity is hypothesized to cause an early burst of species diversification and trait evolution followed by a slowdown in diversification rates as niches are filled. Nonetheless, few studies have tested these predictions empirically with ecomorphological data at the large spatial scales relevant to most of biodiversity. Tanagers (Passeriformes: Thraupidae), the largest family of songbirds, show an early burst of species diversification and provide an excellent opportunity to test one of the hallmarks of adaptive radiation: rapid ecomorphological evolution. Here, we test for an early-burst pattern of a resource-exploiting trait (bill morphology) across the radiation of tanagers using a time-calibrated molecular phylogeny and high-resolution three-dimensional surface scans of bill structure from museum study skins. Using recently developed methods of multivariate trait evolution, we find evidence for a rapid burst of bill shape evolution early in the radiation of tanagers, followed by a subsequent decrease in rates toward the present. Likewise, we show that morphological disparity is distributed among (rather than within) subclades, indicating that most of the observed bill shape disparity evolved early in the radiation of tanagers and has slowed through time. The diversification dynamics of tanagers match patterns expected from adaptive radiation and the filling of ecomorphospace.
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Affiliation(s)
| | - Kevin J Burns
- Department of Biology, San Diego State University, San Diego, CA 92182, USA
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9
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Pouchon C, Lavergne S, Fernández Á, Alberti A, Aubert S, Mavárez J. Phylogenetic signatures of ecological divergence and leapfrog adaptive radiation in Espeletia. AMERICAN JOURNAL OF BOTANY 2021; 108:113-128. [PMID: 33426651 DOI: 10.1002/ajb2.1591] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 09/21/2020] [Indexed: 06/12/2023]
Abstract
PREMISE Events of accelerated species diversification represent one of Earth's most celebrated evolutionary outcomes. Northern Andean high-elevation ecosystems, or páramos, host some plant lineages that have experienced the fastest diversification rates, likely triggered by ecological opportunities created by mountain uplifts, local climate shifts, and key trait innovations. However, the mechanisms behind rapid speciation into the new adaptive zone provided by these opportunities have long remained unclear. METHODS We address this issue by studying the Venezuelan clade of Espeletia, a species-rich group of páramo-endemics showing a dazzling ecological and morphological diversity. We performed several comparative analyses to study both lineage and trait diversification, using an updated molecular phylogeny of this plant group. RESULTS We showed that sets of either vegetative or reproductive traits have conjointly diversified in Espeletia along different vegetation belts, leading to adaptive syndromes. Diversification in vegetative traits occurred earlier than in reproductive ones. The rate of species and morphological diversification showed a tendency to slow down over time, probably due to diversity dependence. We also found that closely related species exhibit significantly more overlap in their geographic distributions than distantly related taxa, suggesting that most events of ecological divergence occurred at close geographic proximity within páramos. CONCLUSIONS These results provide compelling support for a scenario of small-scale ecological divergence along multiple ecological niche dimensions, possibly driven by competitive interactions between species, and acting sequentially over time in a leapfrog pattern.
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Affiliation(s)
- Charles Pouchon
- Laboratoire d'Ecologie Alpine (LECA), Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, F-38000, Grenoble, France
| | - Sébastien Lavergne
- Laboratoire d'Ecologie Alpine (LECA), Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, F-38000, Grenoble, France
| | - Ángel Fernández
- Herbario IVIC. Instituto Venezolano de Investigaciones Científicas, Apartado 20632, Caracas, 1020-A, Venezuela
| | - Adriana Alberti
- Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Université Evry, Université Paris-Saclay, 91057, Evry, France
| | - Serge Aubert
- Laboratoire d'Ecologie Alpine (LECA), Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, F-38000, Grenoble, France
- Université Grenoble Alpes, CNRS, Université Savoie Mont Blanc, SAJF, Station Alpine Joseph Fourier, 38000, Grenoble, France
| | - Jesús Mavárez
- Laboratoire d'Ecologie Alpine (LECA), Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, F-38000, Grenoble, France
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10
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Pannetier T, Martinez C, Bunnefeld L, Etienne RS. Branching patterns in phylogenies cannot distinguish diversity-dependent diversification from time-dependent diversification. Evolution 2020; 75:25-38. [PMID: 33205832 PMCID: PMC7898657 DOI: 10.1111/evo.14124] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 10/06/2020] [Accepted: 10/10/2020] [Indexed: 01/08/2023]
Abstract
One of the primary goals of macroevolutionary biology has been to explain general trends in long‐term diversity patterns, including whether such patterns correspond to an upscaling of processes occurring at lower scales. Reconstructed phylogenies often show decelerated lineage accumulation over time. This pattern has often been interpreted as the result of diversity‐dependent (DD) diversification, where the accumulation of species causes diversification to decrease through niche filling. However, other processes can also produce such a slowdown, including time dependence without diversity dependence. To test whether phylogenetic branching patterns can be used to distinguish these two mechanisms, we formulated a time‐dependent, but diversity‐independent model that matches the expected diversity through time of a DD model. We simulated phylogenies under each model and studied how well likelihood methods could recover the true diversification mode. Standard model selection criteria always recovered diversity dependence, even when it was not present. We correct for this bias by using a bootstrap method and find that neither model is decisively supported. This implies that the branching pattern of reconstructed trees contains insufficient information to detect the presence or absence of diversity dependence. We advocate that tests encompassing additional data, for example, traits or range distributions, are needed to evaluate how diversity drives macroevolutionary trends.
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Affiliation(s)
- Théo Pannetier
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, 9712 CP, The Netherlands.,Biological and Environmental Sciences, University of Stirling, Stirling, FK9 4LA, United Kingdom
| | - César Martinez
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, 9712 CP, The Netherlands
| | - Lynsey Bunnefeld
- Biological and Environmental Sciences, University of Stirling, Stirling, FK9 4LA, United Kingdom
| | - Rampal S Etienne
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, 9712 CP, The Netherlands
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11
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Chira AM, Cooney CR, Bright JA, Capp EJR, Hughes EC, Moody CJA, Nouri LO, Varley ZK, Thomas GH. The signature of competition in ecomorphological traits across the avian radiation. Proc Biol Sci 2020; 287:20201585. [PMID: 33171084 PMCID: PMC7735287 DOI: 10.1098/rspb.2020.1585] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Competition for shared resources represents a fundamental driver of biological diversity. However, the tempo and mode of phenotypic evolution in deep-time has been predominantly investigated using trait evolutionary models which assume that lineages evolve independently from each other. Consequently, the role of species interactions in driving macroevolutionary dynamics remains poorly understood. Here, we quantify the prevalence for signatures of competition between related species in the evolution of ecomorphological traits across the bird radiation. We find that mechanistic trait models accounting for the effect of species interactions on phenotypic divergence provide the best fit for the data on at least one trait axis in 27 out of 59 clades ranging between 21 and 195 species. Where it occurs, the signature of competition generally coincides with positive species diversity-dependence, driven by the accumulation of lineages with similar ecologies, and we find scarce evidence for trait-dependent or negative diversity-dependent phenotypic evolution. Overall, our results suggest that the footprint of interspecific competition is often eroded in long-term patterns of phenotypic diversification, and that other selection pressures may predominantly shape ecomorphological diversity among extant species at macroevolutionary scales.
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Affiliation(s)
- A M Chira
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK.,Department of Biology, Washington University in St Louis, St Louis, MO, USA
| | - C R Cooney
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - J A Bright
- Department of Biological and Marine Sciences, University of Hull, Hull, UK
| | - E J R Capp
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - E C Hughes
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - C J A Moody
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - L O Nouri
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Z K Varley
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - G H Thomas
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK.,Bird Group, Department of Life Sciences, The Natural History Museum, Tring, Hertfordshire, UK
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12
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Heterogeneous relationships between rates of speciation and body size evolution across vertebrate clades. Nat Ecol Evol 2020; 5:101-110. [PMID: 33106601 DOI: 10.1038/s41559-020-01321-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 09/04/2020] [Indexed: 01/09/2023]
Abstract
Several theories predict that rates of phenotypic evolution should be related to the rate at which new lineages arise. However, drawing general conclusions regarding the coupling between these fundamental evolutionary rates has been difficult due to the inconsistent nature of previous results combined with uncertainty over the most appropriate methodology with which to investigate such relationships. Here we propose and compare the performance of several different approaches for testing associations between lineage-specific rates of speciation and phenotypic evolution using phylogenetic data. We then use the best-performing method to test relationships between rates of speciation and body size evolution in five major vertebrate clades (amphibians, birds, mammals, ray-finned fish and squamate reptiles) at two phylogenetic scales. Our results provide support for the long-standing view that rates of speciation and morphological evolution are generally positively related at broad macroevolutionary scales, but they also reveal a substantial degree of heterogeneity in the strength and direction of these associations at finer scales across the vertebrate tree of life.
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13
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Drury JP, Cowen MC, Grether GF. Competition and hybridization drive interspecific territoriality in birds. Proc Natl Acad Sci U S A 2020; 117:12923-12930. [PMID: 32457140 PMCID: PMC7293658 DOI: 10.1073/pnas.1921380117] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Costly interactions between species that arise as a by-product of ancestral similarities in communication signals are expected to persist only under specific evolutionary circumstances. Territorial aggression between species, for instance, is widely assumed to persist only when extrinsic barriers prevent niche divergence or selection in sympatry is too weak to overcome gene flow from allopatry. However, recent theoretical and comparative studies have challenged this view. Here we present a large-scale, phylogenetic analysis of the distribution and determinants of interspecific territoriality. We find that interspecific territoriality is widespread in birds and strongly associated with hybridization and resource overlap during the breeding season. Contrary to the view that territoriality only persists between species that rarely breed in the same areas or where niche divergence is constrained by habitat structure, we find that interspecific territoriality is positively associated with breeding habitat overlap and unrelated to habitat structure. Furthermore, our results provide compelling evidence that ancestral similarities in territorial signals are maintained and reinforced by selection when interspecific territoriality is adaptive. The territorial signals linked to interspecific territoriality in birds depend on the evolutionary age of interacting species, plumage at shallow (within-family) timescales, and song at deeper (between-family) timescales. Evidently, territorial interactions between species have persisted and shaped phenotypic diversity on a macroevolutionary timescale.
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Affiliation(s)
- Jonathan P Drury
- Department of Biosciences, Durham University, DH1 3LE Durham, United Kingdom;
| | - Madeline C Cowen
- Department of Ecology & Evolutionary Biology, University of California, Los Angeles, CA 90095
| | - Gregory F Grether
- Department of Ecology & Evolutionary Biology, University of California, Los Angeles, CA 90095
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14
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Billaud O, Moen DS, Parsons TL, Morlon H. Estimating Diversity Through Time Using Molecular Phylogenies: Old and Species-Poor Frog Families are the Remnants of a Diverse Past. Syst Biol 2020; 69:363-383. [PMID: 31682272 DOI: 10.1093/sysbio/syz057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 07/08/2019] [Accepted: 08/26/2019] [Indexed: 01/27/2023] Open
Abstract
Estimating how the number of species in a given group varied in the deep past is of key interest to evolutionary biologists. However, current phylogenetic approaches for obtaining such estimates have limitations, such as providing unrealistic diversity estimates at the origin of the group. Here, we develop a robust probabilistic approach for estimating diversity through time curves and uncertainty around these estimates from phylogenetic data. We show with simulations that under various realistic scenarios of diversification, this approach performs better than previously proposed approaches. We also characterize the effect of tree size and undersampling on the performance of the approach. We apply our method to understand patterns of species diversity in anurans (frogs and toads). We find that Archaeobatrachia-a species-poor group of old frog clades often found in temperate regions-formerly had much higher diversity and net diversification rate, but the group declined in diversity as younger, nested clades diversified. This diversity decline seems to be linked to a decline in speciation rate rather than an increase in extinction rate. Our approach, implemented in the R package RPANDA, should be useful for evolutionary biologists interested in understanding how past diversity dynamics have shaped present-day diversity. It could also be useful in other contexts, such as for analyzing clade-clade competitive effects or the effect of species richness on phenotypic divergence.
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Affiliation(s)
- O Billaud
- Institut de Biologie de l'École Normale Supérieure (IBENS), CNRS UMR 8197, INSERM U1024, École Normale Supérieure, Paris Sciences et Lettres (PSL) Research University, F-75005 Paris, France
| | - D S Moen
- Department of Integrative Biology, Oklahoma State University, 517 Life Sciences West, Stillwater, OK 74078, USA
| | - T L Parsons
- Laboratoire de Probabilités, Statistique et Modélisation (LPSM), Sorbonne Université, CNRS UMR 8001, Paris, France
| | - H Morlon
- Institut de Biologie de l'École Normale Supérieure (IBENS), CNRS UMR 8197, INSERM U1024, École Normale Supérieure, Paris Sciences et Lettres (PSL) Research University, F-75005 Paris, France
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15
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Deep-Time Demographic Inference Suggests Ecological Release as Driver of Neoavian Adaptive Radiation. DIVERSITY-BASEL 2020. [DOI: 10.3390/d12040164] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Assessing the applicability of theory to major adaptive radiations in deep time represents an extremely difficult problem in evolutionary biology. Neoaves, which includes 95% of living birds, is believed to have undergone a period of rapid diversification roughly coincident with the Cretaceous–Paleogene (K-Pg) boundary. We investigate whether basal neoavian lineages experienced an ecological release in response to ecological opportunity, as evidenced by density compensation. We estimated effective population sizes (Ne) of basal neoavian lineages by combining coalescent branch lengths (CBLs) and the numbers of generations between successive divergences. We used a modified version of Accurate Species TRee Algorithm (ASTRAL) to estimate CBLs directly from insertion–deletion (indel) data, as well as from gene trees using DNA sequence and/or indel data. We found that some divergences near the K-Pg boundary involved unexpectedly high gene tree discordance relative to the estimated number of generations between speciation events. The simplest explanation for this result is an increase in Ne, despite the caveats discussed herein. It appears that at least some early neoavian lineages, similar to the ancestor of the clade comprising doves, mesites, and sandgrouse, experienced ecological release near the time of the K-Pg mass extinction.
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16
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Lewitus E, Aristide L, Morlon H. Characterizing and Comparing Phylogenetic Trait Data from Their Normalized Laplacian Spectrum. Syst Biol 2020; 69:234-248. [PMID: 31529071 DOI: 10.1093/sysbio/syz061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 09/02/2019] [Accepted: 09/10/2019] [Indexed: 11/13/2022] Open
Abstract
The dissection of the mode and tempo of phenotypic evolution is integral to our understanding of global biodiversity. Our ability to infer patterns of phenotypes across phylogenetic clades is essential to how we infer the macroevolutionary processes governing those patterns. Many methods are already available for fitting models of phenotypic evolution to data. However, there is currently no comprehensive nonparametric framework for characterizing and comparing patterns of phenotypic evolution. Here, we build on a recently introduced approach for using the phylogenetic spectral density profile (SDP) to compare and characterize patterns of phylogenetic diversification, in order to provide a framework for nonparametric analysis of phylogenetic trait data. We show how to construct the SDP of trait data on a phylogenetic tree from the normalized graph Laplacian. We demonstrate on simulated data the utility of the SDP to successfully cluster phylogenetic trait data into meaningful groups and to characterize the phenotypic patterning within those groups. We furthermore demonstrate how the SDP is a powerful tool for visualizing phenotypic space across traits and for assessing whether distinct trait evolution models are distinguishable on a given empirical phylogeny. We illustrate the approach in two empirical data sets: a comprehensive data set of traits involved in song, plumage, and resource-use in tanagers, and a high-dimensional data set of endocranial landmarks in New World monkeys. Considering the proliferation of morphometric and molecular data collected across the tree of life, we expect this approach will benefit big data analyses requiring a comprehensive and intuitive framework.
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Affiliation(s)
- Eric Lewitus
- Ecole Normale Superieure Paris Sciences et Lettres (PSL) Research University, Institut de Biologie de l'Ecole Normale Superieure (IBENS) CNRS UMR 8197 INSERM U1024 46rue d'Ulm,F-75005, Paris, France.,Henry M. Jackson Foundation in support of the US Military HIV Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Leandro Aristide
- Ecole Normale Superieure Paris Sciences et Lettres (PSL) Research University, Institut de Biologie de l'Ecole Normale Superieure (IBENS) CNRS UMR 8197 INSERM U1024 46rue d'Ulm,F-75005, Paris, France
| | - Hélène Morlon
- Ecole Normale Superieure Paris Sciences et Lettres (PSL) Research University, Institut de Biologie de l'Ecole Normale Superieure (IBENS) CNRS UMR 8197 INSERM U1024 46rue d'Ulm,F-75005, Paris, France
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17
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Badikova AA, Dzerzhinsky FY, Kuznetsov AN. Functional Morphology and Adaptive Significance of the Jaw Apparatus of the Parakeet Auklet (Aethia psittacula, Alcidae). BIOL BULL+ 2020. [DOI: 10.1134/s1062359019070021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Aristide L, Morlon H. Understanding the effect of competition during evolutionary radiations: an integrated model of phenotypic and species diversification. Ecol Lett 2019; 22:2006-2017. [PMID: 31507039 DOI: 10.1111/ele.13385] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 06/12/2019] [Accepted: 08/19/2019] [Indexed: 02/05/2023]
Abstract
Competition can drive macroevolutionary change, for example during adaptive radiations. However, we still lack a clear understanding of how it shapes diversification processes and patterns. To better understand the macroevolutionary consequences of competition, as well as the signal left on phylogenetic data, we developed a model linking trait evolution and species diversification in an ecological context. We find four main results: first, competition spurs trait diversity but not necessarily species richness; second, competition produces slowdowns in species diversification even in the absence of explicit ecological limits, but not in phenotypic diversification even in the presence of such limits; third, early burst patterns do not provide a reliable way of testing for adaptive radiations; and fourth, looking for phylogenetic signal in trait data and support for phenotypic models incorporating competition is a better alternative. Our results clarify the macroevolutionary consequences of competition and could help design more powerful tests of adaptive radiations in nature.
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Affiliation(s)
- Leandro Aristide
- École Normale Supérieure, Paris Sciences et Lettres (PSL) Research University, Institut de Biologie de l'École Normale Supérieure (IBENS), CNRS, UMR 8197, INSERM U1024, 46 rue d'Ulm, F-75005, Paris, France
| | - Hélène Morlon
- École Normale Supérieure, Paris Sciences et Lettres (PSL) Research University, Institut de Biologie de l'École Normale Supérieure (IBENS), CNRS, UMR 8197, INSERM U1024, 46 rue d'Ulm, F-75005, Paris, France
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19
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Bloom DD, Egan JP. Systematics of Clupeiformes and testing for ecological limits on species richness in a trans-marine/freshwater clade. NEOTROPICAL ICHTHYOLOGY 2018. [DOI: 10.1590/1982-0224-20180095] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT Clupeiformes (herring, sardines, shad, anchovies and allies) are a globally distributed clade with nearly 400 marine, freshwater, and diadromous species. Although best known as filter feeding fishes that form large schools, this group occupies a diverse array of trophic guilds and habitats. Theory suggests that species richness in clades is modulated by ecological limits, which results in diversity-dependent clade growth, a pattern that most clades exhibit. As a trans-marine/freshwater clade that has undergone repeated transitions between marine and freshwaters, Clupeiformes are an excellent system for investigating the interplay between ecological diversity and macroevolutionary dynamics. In this study we review the systematics of Clupeiformes and explore discordance in phylogenetic relationships and divergence times between mitochondrial and nuclear loci. We then use comparative methods to test whether ecological limits regulate diversity in Clupeiformes. We find discordance in phylogenetic relationships at various taxonomic scales, but also considerable agreement between genomes. Our results suggest that trans-marine/freshwater clades are able to circumvent ecological limits on clade growth at regional, but not on local scales. Our study demonstrates that phylogenies are a critical link between ecology and macroevolutionary dynamics, and suggests habitat transitions can play a key role in shaping diversity patterns, particularly in the neotropics.
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Affiliation(s)
- Devin D. Bloom
- Western Michigan University, USA; Western Michigan University, USA
| | - Joshua P. Egan
- University of Minnesota, USA; University of Minnesota, USA
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20
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Chira AM, Cooney CR, Bright JA, Capp EJR, Hughes EC, Moody CJA, Nouri LO, Varley ZK, Thomas GH. Correlates of rate heterogeneity in avian ecomorphological traits. Ecol Lett 2018; 21:1505-1514. [PMID: 30133084 PMCID: PMC6175488 DOI: 10.1111/ele.13131] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 05/22/2018] [Accepted: 07/05/2018] [Indexed: 12/13/2022]
Abstract
Heterogeneity in rates of trait evolution is widespread, but it remains unclear which processes drive fast and slow character divergence across global radiations. Here, we test multiple hypotheses for explaining rate variation in an ecomorphological trait (beak shape) across a globally distributed group (birds). We find low support that variation in evolutionary rates of species is correlated with life history, environmental mutagenic factors, range size, number of competitors, or living on islands. Indeed, after controlling for the negative effect of species' age, 80% of variation in species‐specific evolutionary rates remains unexplained. At the clade level, high evolutionary rates are associated with unusual phenotypes or high species richness. Taken together, these results imply that macroevolutionary rates of ecomorphological traits are governed by both ecological opportunity in distinct adaptive zones and niche differentiation among closely related species.
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Affiliation(s)
- A M Chira
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - C R Cooney
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - J A Bright
- School of Geosciences, University of South Florida, Tampa, FL, USA
| | - E J R Capp
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - E C Hughes
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - C J A Moody
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - L O Nouri
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - Z K Varley
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK
| | - G H Thomas
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK.,Bird Group, Department of Life Sciences, The Natural History Museum, Tring, Hertfordshire, UK
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21
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Lewitus E. Inferring Evolutionary Process From Neuroanatomical Data. Front Neuroanat 2018; 12:54. [PMID: 30100868 PMCID: PMC6072856 DOI: 10.3389/fnana.2018.00054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 06/06/2018] [Indexed: 01/09/2023] Open
Abstract
Brain evolution has interested neuroanatomists for over a century. These interests often fall on how free the brain is to evolve independently of the body, how free brain regions are to evolve independently of each other, and how different environmental and ecological factors affect the brain over evolutionary time. But despite major advances in phylogenetic methods, comparative neuroanatomists have tended to limit their macroevolutionary toolbox to regression-based analyses and ignored the scope of evolutionary process-based models at their disposal. This Review summarizes the history of comparative neuroanatomy and highlights the pitfalls of the methodologies traditionally used. It provides an overview of evolutionary process-based modeling approaches for investigating univariate and multivariate data, as well as more sophisticated methods that incorporate hypotheses about biotic and abiotic pressures that may drive brain evolution. The benefits of evolutionary process-based models, and shortcomings of regression-based ones, are illustrated with widely used neuroanatomical data. Ultimately, the intent of this Review is to be a guide for subsuming macroevolutionary methods not typically used in comparative neuroanatomy, in order to improve our understanding of how the brain evolves.
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Affiliation(s)
- Eric Lewitus
- Institut de Biologie de l'ENS, Paris Sciences et Lettres Université, Paris, France
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22
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Li J, Huang JP, Sukumaran J, Knowles LL. Microevolutionary processes impact macroevolutionary patterns. BMC Evol Biol 2018; 18:123. [PMID: 30097006 PMCID: PMC6086068 DOI: 10.1186/s12862-018-1236-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 08/01/2018] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Macroevolutionary modeling of species diversification plays important roles in inferring large-scale biodiversity patterns. It allows estimation of speciation and extinction rates and statistically testing their relationships with different ecological factors. However, macroevolutionary patterns are ultimately generated by microevolutionary processes acting at population levels, especially when speciation and extinction are considered protracted instead of point events. Neglecting the connection between micro- and macroevolution may hinder our ability to fully understand the underlying mechanisms that drive the observed patterns. RESULTS In this simulation study, we used the protracted speciation framework to demonstrate that distinct microevolutionary scenarios can generate very similar biodiversity patterns (e.g., latitudinal diversity gradient). We also showed that current macroevolutionary models may not be able to distinguish these different scenarios. CONCLUSIONS Given the compounded nature of speciation and extinction rates, one needs to be cautious when inferring causal relationships between ecological factors and macroevolutioanry rates. Future studies that incorporate microevolutionary processes into current modeling approaches are in need.
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Affiliation(s)
- Jingchun Li
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, USA. .,Museum of Natural History, University of Colorado Boulder, Boulder, USA. .,Museum of Zoology, Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, USA.
| | - Jen-Pen Huang
- Integrative Research Center, The Field Museum, Chicago, USA.,Museum of Zoology, Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, USA
| | - Jeet Sukumaran
- Museum of Zoology, Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, USA
| | - L Lacey Knowles
- Museum of Zoology, Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, USA
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23
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Désamoré A, Laenen B, Miller KB, Bergsten J. Early burst in body size evolution is uncoupled from species diversification in diving beetles (Dytiscidae). Mol Ecol 2018; 27:979-993. [DOI: 10.1111/mec.14492] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 12/06/2017] [Accepted: 12/11/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Aurélie Désamoré
- Zoology Department; Swedish Museum of Natural History; Stockholm Sweden
| | - Benjamin Laenen
- Department of Ecology, Environment and Plant Sciences; Stockholm University; Stockholm Sweden
| | - Kelly B. Miller
- Department of Biology and Museum of Southwestern Biology; University of New Mexico; Albuquerque NM USA
| | - Johannes Bergsten
- Zoology Department; Swedish Museum of Natural History; Stockholm Sweden
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24
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Drury JP, Tobias JA, Burns KJ, Mason NA, Shultz AJ, Morlon H. Contrasting impacts of competition on ecological and social trait evolution in songbirds. PLoS Biol 2018; 16:e2003563. [PMID: 29385141 PMCID: PMC5809094 DOI: 10.1371/journal.pbio.2003563] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 02/12/2018] [Accepted: 01/11/2018] [Indexed: 11/19/2022] Open
Abstract
Competition between closely related species has long been viewed as a powerful selective force that drives trait diversification, thereby generating phenotypic diversity over macroevolutionary timescales. However, although the impact of interspecific competition has been documented in a handful of iconic insular radiations, most previous studies have focused on traits involved in resource use, and few have examined the role of competition across large, continental radiations. Thus, the extent to which broad-scale patterns of phenotypic diversity are shaped by competition remain largely unclear, particularly for social traits. Here, we estimate the effect of competition between interacting lineages by applying new phylogenetic models that account for such interactions to an exceptionally complete dataset of resource-use traits and social signaling traits for the entire radiation of tanagers (Aves, Thraupidae), the largest family of songbirds. We find that interspecific competition strongly influences the evolution of traits involved in resource use, with a weaker effect on plumage signals, and very little effect on song. Our results provide compelling evidence that interspecific exploitative competition contributes to ecological trait diversification among coexisting species, even in a large continental radiation. In comparison, signal traits mediating mate choice and social competition seem to diversify under different evolutionary models, including rapid diversification in the allopatric stage of speciation.
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Affiliation(s)
- Jonathan P. Drury
- Department of Biosciences, Durham University, Stockton Road, Durham, United Kingdom
| | - Joseph A. Tobias
- Department of Life Sciences, Imperial College London, Ascot, United Kingdom
| | - Kevin J. Burns
- Department of Biology, San Diego State University, San Diego, California, United States of America
| | - Nicholas A. Mason
- Department of Ecology & Evolutionary Biology, Cornell University, Ithaca, New York
| | - Allison J. Shultz
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts
| | - Hélène Morlon
- Institut de Biologie, École Normale Supérieure, CNRS UMR 8197, Paris, France
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25
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Drury JP, Grether GF, Garland T, Morlon H. An Assessment of Phylogenetic Tools for Analyzing the Interplay Between Interspecific Interactions and Phenotypic Evolution. Syst Biol 2017; 67:413-427. [DOI: 10.1093/sysbio/syx079] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 09/21/2017] [Indexed: 11/14/2022] Open
Affiliation(s)
- J P Drury
- Département de Biologie, Institut de Biologie, École Normale Supérieure, CNRS UMR 8197, 46 rue d’Ulm 75005 Paris, France
- Department of Ecology & Evolutionary Biology, University of California, 621 Charles E. Young Dr. S, Los Angeles, CA 90095-1606, USA
| | - G F Grether
- Department of Ecology & Evolutionary Biology, University of California, 621 Charles E. Young Dr. S, Los Angeles, CA 90095-1606, USA
| | - T Garland
- Department of Evolution, Ecology, and Organismal Biology, University of California, 900 University Ave., Riverside, CA 92521, USA
| | - H Morlon
- Département de Biologie, Institut de Biologie, École Normale Supérieure, CNRS UMR 8197, 46 rue d’Ulm 75005 Paris, France
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26
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Tigano A, Sackton TB, Friesen VL. Assembly and RNA-free annotation of highly heterozygous genomes: The case of the thick-billed murre (Uria lomvia). Mol Ecol Resour 2017; 18:79-90. [PMID: 28815912 DOI: 10.1111/1755-0998.12712] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 08/02/2017] [Accepted: 08/08/2017] [Indexed: 11/29/2022]
Abstract
Thanks to a dramatic reduction in sequencing costs followed by a rapid development of bioinformatics tools, genome assembly and annotation have become accessible to many researchers in recent years. Among tetrapods, birds have genomes that display many features that facilitate their assembly and annotation, such as small genome size, low number of repeats and highly conserved genomic structure. However, we found that high genomic heterozygosity could have a great impact on the quality of the genome assembly of the thick-billed murre (Uria lomvia), an arctic colonial seabird. In this study, we tested the performance of three genome assemblers, ray/sscape, soapdenovo2 and platanus, in assembling the highly heterozygous genome of the thick-billed murre. Our results show that platanus, an assembler specifically designed for heterozygous genomes, outperforms the other two approaches and produces a highly contiguous (N50 = 15.8 Mb) and complete genome assembly (93% presence of genes from the Benchmarking Universal Single Copy Ortholog [BUSCO] gene set). Additionally, we annotated the thick-billed murre genome using a homology-based approach that takes advantage of the genomic resources available for birds and other taxa. Our study will be useful for those researchers who are approaching assembly and annotation of highly heterozygous genomes, or genomes of species of conservation concern, and/or who have limited financial resources.
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Affiliation(s)
- Anna Tigano
- Department of Biology, Queen's University, Kingston, ON, Canada
| | | | - Vicki L Friesen
- Department of Biology, Queen's University, Kingston, ON, Canada
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27
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Accelerated body size evolution during cold climatic periods in the Cenozoic. Proc Natl Acad Sci U S A 2017; 114:4183-4188. [PMID: 28373536 DOI: 10.1073/pnas.1606868114] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
How ecological and morphological diversity accumulates over geological time is much debated. Adaptive radiation theory has been successful in testing the effects of biotic interactions on the rapid divergence of phenotypes within a clade, but this theory ignores abiotic effects. The role of abiotic drivers on the tempo of phenotypic evolution has been tested only in a few lineages or small clades from the fossil record. Here, we develop a phylogenetic comparative framework for testing if and how clade-wide rates of phenotypic evolution vary with abiotic drivers. We apply this approach to comprehensive bird and mammal phylogenies, body size data for 9,465 extant species, and global average temperature trends over the Cenozoic. Across birds and mammals, we find that the rate of body size evolution is primarily driven by past climate. Unexpectedly, evolutionary rates are inferred to be higher during periods of cold rather than warm climates in most groups, suggesting that temperature influences evolutionary rates by modifying selective pressures rather than through its effect on energy availability and metabolism. The effect of climate on the rate of body size evolution seems to be a general feature of endotherm evolution, regardless of wide differences in species' ecology and evolutionary history. These results suggest that climatic changes played a major role in shaping species' evolution in the past and could also play a major role in shaping their evolution in the future.
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28
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Mongiardino Koch N, Ceccarelli FS, Ojanguren-Affilastro AA, Ramírez MJ. Discrete and morphometric traits reveal contrasting patterns and processes in the macroevolutionary history of a clade of scorpions. J Evol Biol 2017; 30:814-825. [DOI: 10.1111/jeb.13050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 02/05/2017] [Accepted: 02/06/2017] [Indexed: 02/01/2023]
Affiliation(s)
| | - F. S. Ceccarelli
- Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Buenos Aires Argentina
- Departamento de Biología de la Conservación; Centro de Investigación Científica y de Educación Superior de Ensenada; Ensenada Baja California México
| | | | - M. J. Ramírez
- Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Buenos Aires Argentina
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29
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Doebeli M, Ispolatov I. Diversity and Coevolutionary Dynamics in High-Dimensional Phenotype Spaces. Am Nat 2016; 189:105-120. [PMID: 28107053 DOI: 10.1086/689891] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We study macroevolutionary dynamics by extending microevolutionary competition models to long timescales. It has been shown that for a general class of competition models, gradual evolutionary change in continuous phenotypes (evolutionary dynamics) can be nonstationary and even chaotic when the dimension of the phenotype space in which the evolutionary dynamics unfold is high. It has also been shown that evolutionary diversification can occur along nonequilibrium trajectories in phenotype space. We combine these lines of thinking by studying long-term coevolutionary dynamics of emerging lineages in multidimensional phenotype spaces. We use a statistical approach to investigate the evolutionary dynamics of many different systems. We find (1) that, for a given dimension of phenotype space, the coevolutionary dynamics tend to be fast and nonstationary for an intermediate number of coexisting lineages but tend to stabilize as the evolving communities reach a saturation level of diversity and (2) that the amount of diversity at the saturation level increases rapidly (exponentially) with the dimension of phenotype space. These results have implications for theoretical perspectives on major macroevolutionary patterns such as adaptive radiation, long-term temporal patterns of phenotypic changes, and the evolution of diversity.
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30
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Drury J, Clavel J, Manceau M, Morlon H. Estimating the Effect of Competition on Trait Evolution Using Maximum Likelihood Inference. Syst Biol 2016; 65:700-10. [DOI: 10.1093/sysbio/syw020] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 03/01/2016] [Indexed: 11/14/2022] Open
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31
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Badikova AA, Dzerzhinsky FY, Potapova EG. The functional morphology of the jaw apparatus in the black guillemot (Cepphus grylle) and the thick-billed (Uria lomvia) and common (Uria aalge) murres. BIOL BULL+ 2015. [DOI: 10.1134/s1062359015080026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Serrano-Serrano ML, Perret M, Guignard M, Chautems A, Silvestro D, Salamin N. Decoupled evolution of floral traits and climatic preferences in a clade of Neotropical Gesneriaceae. BMC Evol Biol 2015; 15:247. [PMID: 26555183 PMCID: PMC4641406 DOI: 10.1186/s12862-015-0527-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 10/30/2015] [Indexed: 11/12/2022] Open
Abstract
Background Major factors influencing the phenotypic diversity of a lineage can be recognized by characterizing the extent and mode of trait evolution between related species. Here, we compared the evolutionary dynamics of traits associated with floral morphology and climatic preferences in a clade composed of the genera Codonanthopsis, Codonanthe and Nematanthus (Gesneriaceae). To test the mode and specific components that lead to phenotypic diversity in this group, we performed a Bayesian phylogenetic analysis of combined nuclear and plastid DNA sequences and modeled the evolution of quantitative traits related to flower shape and size and to climatic preferences. We propose an alternative approach to display graphically the complex dynamics of trait evolution along a phylogenetic tree using a wide range of evolutionary scenarios. Results Our results demonstrated heterogeneous trait evolution. Floral shapes displaced into separate regimes selected by the different pollinator types (hummingbirds versus insects), while floral size underwent a clade-specific evolution. Rates of evolution were higher for the clade that is hummingbird pollinated and experienced flower resupination, compared with species pollinated by bees, suggesting a relevant role of plant-pollinator interactions in lowland rainforest. The evolution of temperature preferences is best explained by a model with distinct selective regimes between the Brazilian Atlantic Forest and the other biomes, whereas differentiation along the precipitation axis was characterized by higher rates, compared with temperature, and no regime or clade-specific patterns. Conclusions Our study shows different selective regimes and clade-specific patterns in the evolution of morphological and climatic components during the diversification of Neotropical species. Our new graphical visualization tool allows the representation of trait trajectories under parameter-rich models, thus contributing to a better understanding of complex evolutionary dynamics. Electronic supplementary material The online version of this article (doi:10.1186/s12862-015-0527-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Martha Liliana Serrano-Serrano
- Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland. .,Swiss Institute of Bioinformatics, Quartier Sorge, 1015, Lausanne, Switzerland.
| | - Mathieu Perret
- Conservatoire et Jardin botaniques de la Ville de Genève and Laboratory of Plant Systematics and Biodiversity, University of Geneva, Chemin de l'Impératrice, 1, 1292 , Chambésy, Geneva, Switzerland.
| | - Maïté Guignard
- Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland.
| | - Alain Chautems
- Conservatoire et Jardin botaniques de la Ville de Genève and Laboratory of Plant Systematics and Biodiversity, University of Geneva, Chemin de l'Impératrice, 1, 1292 , Chambésy, Geneva, Switzerland.
| | - Daniele Silvestro
- Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland. .,Swiss Institute of Bioinformatics, Quartier Sorge, 1015, Lausanne, Switzerland. .,Department of Plant and Environmental Sciences, University of Gothenburg, Carl Skottsbergs gata 22B, 413 19, Gothenburg, Sweden.
| | - Nicolas Salamin
- Department of Ecology and Evolution, University of Lausanne, 1015, Lausanne, Switzerland. .,Swiss Institute of Bioinformatics, Quartier Sorge, 1015, Lausanne, Switzerland.
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Pennell MW, FitzJohn RG, Cornwell WK, Harmon LJ. Model Adequacy and the Macroevolution of Angiosperm Functional Traits. Am Nat 2015; 186:E33-50. [DOI: 10.1086/682022] [Citation(s) in RCA: 128] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Iterative adaptive radiations of fossil canids show no evidence for diversity-dependent trait evolution. Proc Natl Acad Sci U S A 2015; 112:4897-902. [PMID: 25901311 DOI: 10.1073/pnas.1403666111] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A long-standing hypothesis in adaptive radiation theory is that ecological opportunity constrains rates of phenotypic evolution, generating a burst of morphological disparity early in clade history. Empirical support for the early burst model is rare in comparative data, however. One possible reason for this lack of support is that most phylogenetic tests have focused on extant clades, neglecting information from fossil taxa. Here, I test for the expected signature of adaptive radiation using the outstanding 40-My fossil record of North American canids. Models implying time- and diversity-dependent rates of morphological evolution are strongly rejected for two ecologically important traits, body size and grinding area of the molar teeth. Instead, Ornstein-Uhlenbeck processes implying repeated, and sometimes rapid, attraction to distinct dietary adaptive peaks receive substantial support. Diversity-dependent rates of morphological evolution seem uncommon in clades, such as canids, that exhibit a pattern of replicated adaptive radiation. Instead, these clades might best be thought of as deterministic radiations in constrained Simpsonian subzones of a major adaptive zone. Support for adaptive peak models may be diagnostic of subzonal radiations. It remains to be seen whether early burst or ecological opportunity models can explain broader adaptive radiations, such as the evolution of higher taxa.
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Uyeda JC, Caetano DS, Pennell MW. Comparative Analysis of Principal Components Can be Misleading. Syst Biol 2015; 64:677-89. [DOI: 10.1093/sysbio/syv019] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 03/30/2015] [Indexed: 11/14/2022] Open
Affiliation(s)
- Josef C. Uyeda
- Department of Biological Sciences, Institute for Bioinformatics and Evolutionary Studies, University of Idaho, Moscow, ID 83844, USA
| | - Daniel S. Caetano
- Department of Biological Sciences, Institute for Bioinformatics and Evolutionary Studies, University of Idaho, Moscow, ID 83844, USA
| | - Matthew W. Pennell
- Department of Biological Sciences, Institute for Bioinformatics and Evolutionary Studies, University of Idaho, Moscow, ID 83844, USA
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Garcia-R JC, Gibb GC, Trewick SA. Deep global evolutionary radiation in birds: Diversification and trait evolution in the cosmopolitan bird family Rallidae. Mol Phylogenet Evol 2014; 81:96-108. [DOI: 10.1016/j.ympev.2014.09.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 08/08/2014] [Accepted: 09/10/2014] [Indexed: 10/24/2022]
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Abstract
What explains why some groups of organisms, like birds, are so species rich? And what explains their extraordinary ecological diversity, ranging from large, flightless birds to small migratory species that fly thousand of kilometers every year? These and similar questions have spurred great interest in adaptive radiation, the diversification of ecological traits in a rapidly speciating group of organisms. Although the initial formulation of modern concepts of adaptive radiation arose from consideration of the fossil record, rigorous attempts to identify adaptive radiation in the fossil record are still uncommon. Moreover, most studies of adaptive radiation concern groups that are less than 50 million years old. Thus, it is unclear how important adaptive radiation is over temporal scales that span much larger portions of the history of life. In this issue, Benson et al. test the idea of a "deep-time" adaptive radiation in dinosaurs, compiling and using one of the most comprehensive phylogenetic and body-size datasets for fossils. Using recent phylogenetic statistical methods, they find that in most clades of dinosaurs there is a strong signal of an "early burst" in body-size evolution, a predicted pattern of adaptive radiation in which rapid trait evolution happens early in a group's history and then slows down. They also find that body-size evolution did not slow down in the lineage leading to birds, hinting at why birds survived to the present day and diversified. This paper represents one of the most convincing attempts at understanding deep-time adaptive radiations.
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Affiliation(s)
- Daniel Moen
- Institut de Biologie (IBENS), École Normale Supérieure, Paris, France
- * E-mail:
| | - Hélène Morlon
- Institut de Biologie (IBENS), École Normale Supérieure, Paris, France
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Moen D, Morlon H. Why does diversification slow down? Trends Ecol Evol 2014; 29:190-7. [DOI: 10.1016/j.tree.2014.01.010] [Citation(s) in RCA: 198] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Revised: 01/24/2014] [Accepted: 01/27/2014] [Indexed: 01/22/2023]
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Rabosky DL, Donnellan SC, Grundler M, Lovette IJ. Analysis and Visualization of Complex Macroevolutionary Dynamics: An Example from Australian Scincid Lizards. Syst Biol 2014; 63:610-27. [DOI: 10.1093/sysbio/syu025] [Citation(s) in RCA: 191] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Daniel L. Rabosky
- Museum of Zoology, University of Michigan, Ann Arbor, MI 48109, USA; 2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA; 3South Australian Museum, North Terrace, Adelaide 5000, Australia; 4Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, Adelaide 5005, Australia; 5Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850, USA
- Museum of Zoology, University of Michigan, Ann Arbor, MI 48109, USA; 2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA; 3South Australian Museum, North Terrace, Adelaide 5000, Australia; 4Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, Adelaide 5005, Australia; 5Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850, USA
| | - Stephen C. Donnellan
- Museum of Zoology, University of Michigan, Ann Arbor, MI 48109, USA; 2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA; 3South Australian Museum, North Terrace, Adelaide 5000, Australia; 4Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, Adelaide 5005, Australia; 5Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850, USA
- Museum of Zoology, University of Michigan, Ann Arbor, MI 48109, USA; 2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA; 3South Australian Museum, North Terrace, Adelaide 5000, Australia; 4Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, Adelaide 5005, Australia; 5Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850, USA
| | - Michael Grundler
- Museum of Zoology, University of Michigan, Ann Arbor, MI 48109, USA; 2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA; 3South Australian Museum, North Terrace, Adelaide 5000, Australia; 4Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, Adelaide 5005, Australia; 5Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850, USA
| | - Irby J. Lovette
- Museum of Zoology, University of Michigan, Ann Arbor, MI 48109, USA; 2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA; 3South Australian Museum, North Terrace, Adelaide 5000, Australia; 4Australian Centre for Evolutionary Biology and Biodiversity, University of Adelaide, Adelaide 5005, Australia; 5Cornell Lab of Ornithology, Cornell University, Ithaca, New York 14850, USA
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Modeling lineage and phenotypic diversification in the New World monkey (Platyrrhini, Primates) radiation. Mol Phylogenet Evol 2013; 82 Pt B:375-85. [PMID: 24287474 DOI: 10.1016/j.ympev.2013.11.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 10/24/2013] [Accepted: 11/15/2013] [Indexed: 11/19/2022]
Abstract
Adaptive radiations that have taken place in the distant past can now be more thoroughly studied with the availability of large molecular phylogenies and comparative data drawn from extant and fossil species. Platyrrhines are a good example of a major mammalian evolutionary radiation confined to a single continent, involving a relatively large temporal scale and documented by a relatively small but informative fossil record. Here, we present comparative evidence using data on extant and fossil species to explore alternative evolutionary models in an effort to better understand the process of platyrrhine lineage and phenotypic diversification. Specifically, we compare the likelihood of null models of lineage and phenotypic diversification versus various models of adaptive evolution. Moreover, we statistically explore the main ecological dimension behind the platyrrhine diversification. Contrary to the previous proposals, our study did not find evidence of a rapid lineage accumulation in the phylogenetic tree of extant platyrrhine species. However, the fossil-based diversity curve seems to show a slowdown in diversification rates toward present times. This also suggests an early high rate of extinction among lineages within crown Platyrrhini. Finally, our analyses support the hypothesis that the platyrrhine phenotypic diversification appears to be characterized by an early and profound differentiation in body size related to a multidimensional niche model, followed by little subsequent change (i.e., stasis).
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Pyron RA, Burbrink FT. Phylogenetic estimates of speciation and extinction rates for testing ecological and evolutionary hypotheses. Trends Ecol Evol 2013; 28:729-36. [PMID: 24120478 DOI: 10.1016/j.tree.2013.09.007] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 09/03/2013] [Accepted: 09/15/2013] [Indexed: 10/26/2022]
Abstract
Phylogenies are used to estimate rates of speciation and extinction, reconstruct historical diversification scenarios, and link these to ecological and evolutionary factors, such as climate or organismal traits. Recent models can now estimate the effects of binary, multistate, continuous, and biogeographic characters on diversification rates. Others test for diversity dependence (DD) in speciation and extinction, which has become recognized as an important process in numerous clades. A third class incorporates flexible time-dependent functions, enabling reconstruction of major periods of both expanding and contracting diversity. Although there are some potential problems (particularly for estimating extinction), these methods hold promise for answering many classic questions in ecology and evolution, such as the origin of adaptive radiations, and the latitudinal gradient in species richness.
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Affiliation(s)
- R Alexander Pyron
- Department of Biological Sciences, The George Washington University, 2023 G St. NW, Washington, DC 20052, USA.
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