151
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Maestri R. Digest: Adaptive radiations and the multidimensional niche. Evolution 2018; 72:2828-2829. [PMID: 30370653 DOI: 10.1111/evo.13635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 10/23/2018] [Indexed: 11/28/2022]
Abstract
Adaptive radiations depend critically on ecological opportunity as a driver. Aristide et al. (2018) found that a model incorporating the multivariate niche explains the morphological divergence in New World monkeys better than models with a single ecological axis. This raises the question of whether other continental radiations would show signals of adaptive radiation if the niche is more accurately described.
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Affiliation(s)
- Renan Maestri
- Departmento de Ecologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501, Brazil
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152
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Meyer BS, Hablützel PI, Roose AK, Hofmann MJ, Salzburger W, Raeymaekers JAM. An exploration of the links between parasites, trophic ecology, morphology, and immunogenetics in the Lake Tanganyika cichlid radiation. HYDROBIOLOGIA 2018; 832:215-233. [PMID: 30880832 PMCID: PMC6394741 DOI: 10.1007/s10750-018-3798-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 10/02/2018] [Accepted: 10/12/2018] [Indexed: 06/09/2023]
Abstract
Differences in habitat and diet between species are often associated with morphological differences. Habitat and trophic adaptation have therefore been proposed as important drivers of speciation and adaptive radiation. Importantly, habitat and diet shifts likely impose changes in exposure to different parasites and infection risk. As strong selective agents influencing survival and mate choice, parasites might play an important role in host diversification. We explore this possibility for the adaptive radiation of Lake Tanganyika (LT) cichlids. We first compare metazoan macroparasites infection levels between cichlid tribes. We then describe the cichlids' genetic diversity at the major histocompatibility complex (MHC), which plays a key role in vertebrate immunity. Finally, we evaluate to what extent trophic ecology and morphology explain variation in infection levels and MHC, accounting for phylogenetic relationships. We show that different cichlid tribes in LT feature partially non-overlapping parasite communities and partially non-overlapping MHC diversity. While morphology explained 15% of the variation in mean parasite abundance, trophic ecology accounted for 16% and 22% of the MHC variation at the nucleotide and at the amino acid level, respectively. Parasitism and immunogenetic adaptation may thus add additional dimensions to the LT cichlid radiation.
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Affiliation(s)
- Britta S. Meyer
- Zoological Institute, University of Basel, Vesalgasse 1, 4051 Basel, Switzerland
- Evolutionary Ecology of Marine Fishes, Helmholtz Centre for Ocean Research Kiel, GEOMAR, Düsternbrooker Weg 20, 24105 Kiel, Germany
- Present Address: Max Planck Institute for Evolutionary Biology, Max Planck Research Group Behavioural Genomics, August-Thienemann-Str. 2, 24306 Plön, Germany
| | - Pascal I. Hablützel
- Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Ch. Deberiotstraat 32, 3000 Louvain, Belgium
- Present Address: Flanders Marine Institute, Wandelaarkaai 7, 8400 Ostend, Belgium
| | - Anna K. Roose
- Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Ch. Deberiotstraat 32, 3000 Louvain, Belgium
| | - Melinda J. Hofmann
- Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, Calle José Gutiérrez Abascal 2, 28006 Madrid, Spain
- Present Address: Museo de Zoología, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre 1076, Quito, Ecuador
| | - Walter Salzburger
- Zoological Institute, University of Basel, Vesalgasse 1, 4051 Basel, Switzerland
| | - Joost A. M. Raeymaekers
- Zoological Institute, University of Basel, Vesalgasse 1, 4051 Basel, Switzerland
- Laboratory of Biodiversity and Evolutionary Genomics, University of Leuven, Ch. Deberiotstraat 32, 3000 Louvain, Belgium
- Present Address: Faculty of Biosciences and Aquaculture, Nord University, 8049 Bodø, Norway
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153
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Mao Y, Economo EP, Satoh N. The Roles of Introgression and Climate Change in the Rise to Dominance of Acropora Corals. Curr Biol 2018; 28:3373-3382.e5. [PMID: 30344117 DOI: 10.1016/j.cub.2018.08.061] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 08/02/2018] [Accepted: 08/29/2018] [Indexed: 12/31/2022]
Abstract
Reef-building corals provide the structural basis for one of Earth's most spectacular and diverse-but increasingly threatened-ecosystems. Modern Indo-Pacific reefs are dominated by species of the staghorn coral genus Acropora, but the evolutionary and ecological factors associated with their diversification and rise to dominance are unclear. Recent work on evolutionary radiations has demonstrated the importance of introgression and ecological opportunity in promoting diversification and ecological success. Here, we analyze the genomes of five staghorn coral species to examine the roles of introgression and ecological opportunity in the rise to dominance of Acropora. We found evidence for a history marked by a major introgression event as well as recurrent gene flow across species. In addition, we found that genes with topologies mismatching the species tree are evolving faster, which is suggestive of a role for introgression in spreading adaptive genetic variation. Demographic analysis showed that Acropora lineages profited from climate-driven mass extinctions in the Plio-Pleistocene, indicating that Acropora exploited ecological opportunity opened by a new climatic regime favoring species that could cope with rapid sea-level changes. Collectively, the genomes of reef-building corals have recorded an evolutionary history shaped by introgression and climate change, suggesting that Acropora-among most vulnerable corals to stressors-may be critical for understanding how reefs track the impending rapid sea-level changes of the Anthropocene.
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Affiliation(s)
- Yafei Mao
- Marine Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan; Biodiversity and Biocomplexity Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan.
| | - Evan P Economo
- Biodiversity and Biocomplexity Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan.
| | - Noriyuki Satoh
- Marine Genomics Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan.
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154
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Brennan IG, Keogh JS. Miocene biome turnover drove conservative body size evolution across Australian vertebrates. Proc Biol Sci 2018; 285:rspb.2018.1474. [PMID: 30333208 DOI: 10.1098/rspb.2018.1474] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 09/26/2018] [Indexed: 11/12/2022] Open
Abstract
On deep time scales, changing climatic trends can have a predictable influence on macroevolution. From evidence of mass extinctions, we know that rapid climatic oscillations can indirectly open niche space and precipitate adaptive radiation, changing the course of ecological diversification. These dramatic shifts in the global climate, however, are rare events relative to extended periods of protracted climate change and biome turnover. It remains unclear whether during gradually changing periods, shifting habitats may instead promote non-adaptive speciation by facilitating allopatry and phenotypic conservatism. Using fossil-calibrated, species-level phylogenies for five Australian radiations comprising more than 800 species, we investigated temporal trends in biogeography and body size evolution. Here, we demonstrate that gradual Miocene cooling and aridification correlates with the restricted phenotypic diversification of multiple ecologically diverse vertebrate groups. This probably occurred as species ranges became fractured and isolated during continental biome restructuring, encouraging a shift towards conservatism in body size evolution. Our results provide further evidence that abiotic changes, not only biotic interactions, may act as selective forces influencing phenotypic macroevolution.
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Affiliation(s)
- Ian G Brennan
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, ACT 2601, Australia
| | - J Scott Keogh
- Division of Ecology and Evolution, Research School of Biology, Australian National University, Canberra, ACT 2601, Australia
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155
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Developmental Bias and Evolution: A Regulatory Network Perspective. Genetics 2018; 209:949-966. [PMID: 30049818 DOI: 10.1534/genetics.118.300995] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 04/19/2018] [Indexed: 01/12/2023] Open
Abstract
Phenotypic variation is generated by the processes of development, with some variants arising more readily than others-a phenomenon known as "developmental bias." Developmental bias and natural selection have often been portrayed as alternative explanations, but this is a false dichotomy: developmental bias can evolve through natural selection, and bias and selection jointly influence phenotypic evolution. Here, we briefly review the evidence for developmental bias and illustrate how it is studied empirically. We describe recent theory on regulatory networks that explains why the influence of genetic and environmental perturbation on phenotypes is typically not uniform, and may even be biased toward adaptive phenotypic variation. We show how bias produced by developmental processes constitutes an evolving property able to impose direction on adaptive evolution and influence patterns of taxonomic and phenotypic diversity. Taking these considerations together, we argue that it is not sufficient to accommodate developmental bias into evolutionary theory merely as a constraint on evolutionary adaptation. The influence of natural selection in shaping developmental bias, and conversely, the influence of developmental bias in shaping subsequent opportunities for adaptation, requires mechanistic models of development to be expanded and incorporated into evolutionary theory. A regulatory network perspective on phenotypic evolution thus helps to integrate the generation of phenotypic variation with natural selection, leaving evolutionary biology better placed to explain how organisms adapt and diversify.
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156
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157
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Aristide L, Bastide P, Dos Reis SF, Pires Dos Santos TM, Lopes RT, Perez SI. Multiple factors behind early diversification of skull morphology in the continental radiation of New World monkeys. Evolution 2018; 72:2697-2711. [PMID: 30246282 DOI: 10.1111/evo.13609] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Accepted: 09/03/2018] [Indexed: 01/24/2023]
Abstract
Understanding the origin of diversity is a fundamental problem in evolutionary biology. The null expectation for the evolutionary diversification is that all changes in biological diversity are the result of random processes. Adaptive radiations depart from this expectation as ecological factors and natural selection are supposed to play a central role in driving exceptional diversification. However, it is not well understood how large-scale continental radiations, given their characteristics, fit to these opposing theoretical models. Here, we used phylogenetic comparative methods and geometric morphometrics to study the evolutionary process of cranial diversification in the continental radiation of New World monkeys. Particularly, we tested several alternative evolutionary scenarios for morphological evolution in the clade. Results indicated that despite the platyrrhine radiation being old and geographically widespread, the formative patterns arising from the initial stages of diversification probably associated with an adaptive radiation can still be recognized today. We also show that no single explored factor (e.g., ecological or allometric) can be invoked as a complete explanation for the observed phenotypic diversity patterns in the clade and, moreover, that different cranial regions exhibit particular macroevolutionary patterns. Together, our results highlight the evident complexity behind large-scale evolutionary radiations.
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Affiliation(s)
- Leandro Aristide
- División Antropología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas, 1900 La Plata, Buenos Aires, Argentina.,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
| | - Paul Bastide
- Department of Microbiology and Immunology, Rega Institute, KU Leuven - University of Leuven, Herestraat 49 box 1030 BE-3000, Leuven, Belgium
| | - Sergio Furtado Dos Reis
- Departamento de Biologia Animal, Universidade Estadual de Campinas, CEP 13.083-862 Campinas, São Paulo, Brazil
| | - Thaís M Pires Dos Santos
- Laboratório de Instrumentação Nuclear, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CEP 21949-900, Rio de Janeiro, Brazil
| | - Ricardo T Lopes
- Laboratório de Instrumentação Nuclear, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Ilha do Fundão, CEP 21949-900, Rio de Janeiro, Brazil
| | - S Ivan Perez
- División Antropología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas, 1900 La Plata, Buenos Aires, Argentina
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158
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Li Y, Gao QB, Gengji ZM, Jia LK, Wang ZH, Chen SL. Rapid Intraspecific Diversification of the Alpine Species Saxifraga sinomontana (Saxifragaceae) in the Qinghai-Tibetan Plateau and Himalayas. Front Genet 2018; 9:381. [PMID: 30279701 PMCID: PMC6153349 DOI: 10.3389/fgene.2018.00381] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 08/27/2018] [Indexed: 11/30/2022] Open
Abstract
An increasing number of phylogeographic studies have been conducted for plant species in the Qinghai-Tibetan Plateau (QTP) and its flanking mountains. However, these studies have mainly focused on the determination of glacial refugia and routes of inter-/post-glacial expansions. Rapid intraspecific diversification of plants in this region have not been thoroughly discussed. Herein, we investigate the effects of the Quaternary climate changes on population genetic structure and diversifications of a herbaceous alpine species, Saxifraga sinomontana, which may have an evolutionary time scale <5 million years in the QTP and Himalayan regions. Using a total of 350 individuals from 29 populations, we studied the evolutionary history of S. sinomontana by analyzing cpDNA trnL-trnF, rpl16 and nrDNA ITS sequences. A total of 89 haplotypes and 158 genotypes were detected for cpDNA and ITS sequences, respectively. Only a few haplotypes/genotypes were widespread, while an extremely large number of haplotypes/genotypes were restricted to single populations, which were scattered throughout the current geographical range of S. sinomontana. This suggests the existence of microrefugia of this species during the Quaternary glaciations. In addition, the relationships of the haplotypes/genotypes were almost completely not resolved by phylogenetic reconstruction. Combining characteristics in terms of high haplotype richness, large proportion of private haplotypes, and shallow haplotype divergence, we speculate that recent intraspecific diversification has occurred in S. sinomontana. Molecular clock analysis estimated that the onset diversification within S. sinomontana to be 1.09 Ma (95% HPD = 0.80–1.45), coinciding with the extensive Quaternary glaciations on the QTP which started ca. 1.17 Ma. The Quaternary climatic oscillations may have triggered rapid intraspecific diversification in this QTP-Himalayan species. However, large niche breadth, as well as introgression/hybridization between the studied species and its closely related sympatric saxifrages, may also played a role to some extent on the current genetic structure of S. sinomontana, which need to be further studied.
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Affiliation(s)
- Yan Li
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Qing-Bo Gao
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,Qinghai Provincial Key Laboratory of Crop Molecular Breeding, Xining, China
| | - Zhuo-Ma Gengji
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Liu-Kun Jia
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Zhi-Hua Wang
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Shi-Long Chen
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
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159
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Edwards KF, Kremer CT, Miller ET, Osmond MM, Litchman E, Klausmeier CA. Evolutionarily stable communities: a framework for understanding the role of trait evolution in the maintenance of diversity. Ecol Lett 2018; 21:1853-1868. [PMID: 30272831 DOI: 10.1111/ele.13142] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 04/16/2018] [Accepted: 07/23/2018] [Indexed: 01/15/2023]
Abstract
Biological diversity depends on the interplay between evolutionary diversification and ecological mechanisms allowing species to coexist. Current research increasingly integrates ecology and evolution over a range of timescales, but our common conceptual framework for understanding species coexistence requires better incorporation of evolutionary processes. Here, we focus on the idea of evolutionarily stable communities (ESCs), which are theoretical endpoints of evolution in a community context. We use ESCs as a unifying framework to highlight some important but under-appreciated theoretical results, and we review empirical research relevant to these theoretical predictions. We explain how, in addition to generating diversity, evolution can also limit diversity by reducing the effectiveness of coexistence mechanisms. The coevolving traits of competing species may either diverge or converge, depending on whether the number of species in the community is low (undersaturated) or high (oversaturated) relative to the ESC. Competition in oversaturated communities can lead to extinction or neutrally coexisting, ecologically equivalent species. It is critical to consider trait evolution when investigating fundamental ecological questions like the strength of different coexistence mechanisms, the feasibility of ecologically equivalent species, and the interpretation of different patterns of trait dispersion.
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Affiliation(s)
- Kyle F Edwards
- Department of Oceanography, University of Hawai'i at Manoa, Honolulu, HI, 96822, USA
| | - Colin T Kremer
- Department of Ecology & Evolutionary Biology, Yale University, New Haven, CT, 06520, USA.,Kellogg Biological Station, Michigan State University, Hickory Corners, MI, 49060, USA.,Program in Ecology, Evolutionary Biology, & Behavior, Michigan State University, East Lansing, MI, 48824, USA
| | - Elizabeth T Miller
- Institute of Ecology and Evolution, University of Oregon, Eugene, OR, 97403, USA
| | - Matthew M Osmond
- Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, USA
| | - Elena Litchman
- Kellogg Biological Station, Michigan State University, Hickory Corners, MI, 49060, USA.,Program in Ecology, Evolutionary Biology, & Behavior, Michigan State University, East Lansing, MI, 48824, USA.,Department of Integrative Biology, Michigan State University, East Lansing, MI, 48824, USA
| | - Christopher A Klausmeier
- Kellogg Biological Station, Michigan State University, Hickory Corners, MI, 49060, USA.,Program in Ecology, Evolutionary Biology, & Behavior, Michigan State University, East Lansing, MI, 48824, USA.,Department of Plant Biology, Michigan State University, East Lansing, MI, 48824, USA
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160
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Divergence, Convergence and Phenotypic Diversity of Neotropical Frugivorous Bats. DIVERSITY 2018. [DOI: 10.3390/d10030100] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Knowing how adaptation shapes morphological evolution is fundamental to understanding the processes that promote biological diversity. However, there is a lack of empirical evidence on the effects of adaptive radiations on phenotypic diversity, which is related to processes that promote phenotypic divergence and convergence. We applied comparative methods to identify shifts in adaptive peaks and to detect divergence and convergence in skull morphology of frugivorous bats (Phyllostomidae: Stenodermatinae and Carollinae), an ecologically diverse group with strong association between skull morphology, feeding performance and diet that suggests adaptive diversification through morphological innovation. We found divergence and convergence for skull morphology. Fifteen peak shifts were found for jaws, which result in four convergent and four divergent regimes. For skull, nine peak shifts were detected that result in three convergent and three divergent regimes. Furthermore, convergence was significant and strong for skull morphology since distantly related organisms converged to the same adaptive optima. Results suggest that convergence indicates the effect of restriction on phenotypes to keep the advantages provided by the skull phenotype that played a central role in the evolution of strict frugivory in phyllostomids. We conclude that convergence has limited phenotypic diversity of functional traits related to feeding in phyllostomid frugivores.
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161
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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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162
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Reis J, Bidau CJ, Maestri R, Martinez PA. Diversification of the climatic niche drove the recent processes of speciation in Sigmodontinae (Rodentia, Cricetidae). Mamm Rev 2018. [DOI: 10.1111/mam.12128] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Jennifer Reis
- PIBiLab - Laboratório de Pesquisas Integrativas em Biodiversidade; Universidade Federal de Sergipe; São Cristóvão SE 49100-000 Brazil
| | - Claudio J. Bidau
- Capital Federal; Olaguer 444, 1752 Lomas del Mirador Buenos Aires Argentina
| | - Renan Maestri
- Departamento de Zoologia; Instituto de Biociências; Universidade Federal do Rio Grande do Sul; Porto Alegre RS 91501-970 Brazil
| | - Pablo A. Martinez
- PIBiLab - Laboratório de Pesquisas Integrativas em Biodiversidade; Universidade Federal de Sergipe; São Cristóvão SE 49100-000 Brazil
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163
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Moore TE, Schlichting CD, Aiello-Lammens ME, Mocko K, Jones CS. Divergent trait and environment relationships among parallel radiations in Pelargonium (Geraniaceae): a role for evolutionary legacy? THE NEW PHYTOLOGIST 2018; 219:794-807. [PMID: 29749630 DOI: 10.1111/nph.15196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 03/27/2018] [Indexed: 06/08/2023]
Abstract
Functional traits in closely related lineages are expected to vary similarly along common environmental gradients as a result of shared evolutionary and biogeographic history, or legacy effects, and as a result of biophysical tradeoffs in construction. We test these predictions in Pelargonium, a relatively recent evolutionary radiation. Bayesian phylogenetic mixed effects models assessed, at the subclade level, associations between plant height, leaf area, leaf nitrogen content and leaf mass per area (LMA), and five environmental variables capturing temperature and rainfall gradients across the Greater Cape Floristic Region of South Africa. Trait-trait integration was assessed via pairwise correlations within subclades. Of 20 trait-environment associations, 17 differed among subclades. Signs of regression coefficients diverged for height, leaf area and leaf nitrogen content, but not for LMA. Subclades also differed in trait-trait relationships and these differences were modulated by rainfall seasonality. Leave-one-out cross-validation revealed that whether trait variation was better predicted by environmental predictors or trait-trait integration depended on the clade and trait in question. Legacy signals in trait-environment and trait-trait relationships were apparently lost during the earliest diversification of Pelargonium, but then retained during subsequent subclade evolution. Overall, we demonstrate that global-scale patterns are poor predictors of patterns of trait variation at finer geographic and taxonomic scales.
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Affiliation(s)
- Timothy E Moore
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269-3043, USA
| | - Carl D Schlichting
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269-3043, USA
| | | | - Kerri Mocko
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269-3043, USA
| | - Cynthia S Jones
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269-3043, USA
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164
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Rolshausen G, Davies TJ, Hendry AP. Evolutionary Rates Standardized for Evolutionary Space: Perspectives on Trait Evolution. Trends Ecol Evol 2018; 33:379-389. [DOI: 10.1016/j.tree.2018.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 04/04/2018] [Accepted: 04/05/2018] [Indexed: 12/30/2022]
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165
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Hochberg ME, Marquet PA, Boyd R, Wagner A. Innovation: an emerging focus from cells to societies. Philos Trans R Soc Lond B Biol Sci 2018; 372:rstb.2016.0414. [PMID: 29061887 DOI: 10.1098/rstb.2016.0414] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/30/2017] [Indexed: 12/20/2022] Open
Abstract
Innovations are generally unexpected, often spectacular changes in phenotypes and ecological functions. The contributions to this theme issue are the latest conceptual, theoretical and experimental developments, addressing how ecology, environment, ontogeny and evolution are central to understanding the complexity of the processes underlying innovations. Here, we set the stage by introducing and defining key terms relating to innovation and discuss their relevance to biological, cultural and technological change. Discovering how the generation and transmission of novel biological information, environmental interactions and selective evolutionary processes contribute to innovation as an ecosystem will shed light on how the dominant features across life come to be, generalize to social, cultural and technological evolution, and have applications in the health sciences and sustainability.This article is part of the theme issue 'Process and pattern in innovations from cells to societies'.
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Affiliation(s)
- Michael E Hochberg
- Institut des Sciences de l'Evolution, Université de Montpellier, 34095 Montpellier, France .,Santa Fe Institute, Santa Fe, NM 87501, USA.,Institute for Advanced Study in Toulouse, 31015 Toulouse, France
| | - Pablo A Marquet
- Santa Fe Institute, Santa Fe, NM 87501, USA.,Departamento de Ecologı́a, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago, Chile.,Instituto de Ecología y Biodiversidad (IEB), Casilla 653, Santiago, Chile.,Instituto de Sistemas Complejos de Valparaíso (ISCV), Artillería 4780, Valparaíso, Chile
| | - Robert Boyd
- Santa Fe Institute, Santa Fe, NM 87501, USA.,School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287, USA
| | - Andreas Wagner
- Santa Fe Institute, Santa Fe, NM 87501, USA.,Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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166
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Clemente M, Fusco G, Tonina L, Giomi F. Temperature-induced phenotypic plasticity in the ovipositor of the invasive species Drosophila suzukii. J Therm Biol 2018; 75:62-68. [PMID: 30017053 DOI: 10.1016/j.jtherbio.2018.05.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 04/10/2018] [Accepted: 05/10/2018] [Indexed: 12/18/2022]
Abstract
Drosophila suzukii (Matsumura, 1931) is a highly successful invasive dipteran which represents a serious threat for global fruit industry. Among other adaptive traits, D. suzukii owes its success to the derived morphological features of its ovipositor, which allows the insect to exploit the exclusive ecological niche of fresh fruit, thus avoiding competition with other closely related species. With the aim of investigating temperature-induced phenotypic plasticity of D. suzukii ovipositor, we reared this insect in four different laboratory conditions, represented by the combination of two developmental temperatures and two diet regimes for the larvae. We recorded the effects of these two factors on ovipositor size and shape and overall body size through a combination of distance-based and geometric morphometric analyses. Results showed that insects attain the largest body sizes at lower temperature, whereas the diet does not determine significant difference in size. However, the effect on size of the two factors is less pronounced in the ovipositor, which shows a negative allometry with respect to body size in all treatments. At higher temperature, ovipositor shape tends also to co-vary with its own size. Neither temperature nor diet have significant effect on ovipositor bilateral fluctuating asymmetry. These results confirm the hypothesis that in D. suzukii the toughened valve of the ovipositor are subjected to effective morpho-functional constraints, while probably being under strong selection by reason of their mechanical role.
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Affiliation(s)
| | | | - Lorenzo Tonina
- Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Italy
| | - Folco Giomi
- Department of Agronomy, Food, Natural resources, Animals and Environment, University of Padova, Italy.
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167
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Ornelas‐García CP, Córdova‐Tapia F, Zambrano L, Bermúdez‐González MP, Mercado‐Silva N, Mendoza‐Garfias B, Bautista A. Trophic specialization and morphological divergence between two sympatric species in Lake Catemaco, Mexico. Ecol Evol 2018; 8:4867-4875. [PMID: 29876065 PMCID: PMC5980260 DOI: 10.1002/ece3.4042] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 03/02/2018] [Accepted: 03/15/2018] [Indexed: 12/15/2022] Open
Abstract
The association of morphological divergence with ecological segregation among closely related species could be considered as a signal of divergent selection in ecological speciation processes. Environmental signals such as diet can trigger phenotypic evolution, making polymorphic species valuable systems for studying the evolution of trophic-related traits. The main goal of this study was to analyze the association between morphological differences in trophic-related traits and ecological divergence in two sympatric species, Astyanax aeneus and A. caballeroi, inhabiting Lake Catemaco, Mexico. The trophic differences of a total of 70 individuals (35 A. aeneus and 35 A. caballeroi) were examined using stable isotopes and gut content analysis; a subset of the sample was used to characterize six trophic and six ecomorphological variables. In our results, we recovered significant differences between both species in the values of stable isotopes, with higher values of δ15N for A. caballeroi than for A. aeneus. Gut content results were consistent with the stable isotope data, with a higher proportion of invertebrates in A. caballeroi (a consumption of invertebrates ten times higher than that of A. aeneus, which in turn consumed three times more vegetal material than A. caballeroi). Finally, we found significant relationship between ecomorphology and stable isotopes (r = .24, p < .01), hence, head length, preorbital length, eye diameter, and δ15N were all positively correlated; these characteristics correspond to A. caballeroi. While longer gut and gill rakers, deeper bodies, and vegetal material consumption were positively correlated and corresponded to A. aeneus. Our results are consistent with the hypothesis that morphological divergence in trophic-related traits could be associated with niche partitioning, allowing the coexistence of closely related species and reducing interspecific competition.
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Affiliation(s)
| | - Fernando Córdova‐Tapia
- Centro de Investigación en Biodiversidad y ConservaciónUniversidad Autónoma del Estado de MorelosCuernavacaMorelosMexico
| | - Luis Zambrano
- Departamento de ZoologíaInstituto de BiologíaUniversidad Autónoma de MéxicoMexico CityMexico
| | - María Pamela Bermúdez‐González
- Programa Institucional de DoctoradoFacultad de Ciencias Naturales Campus UAQ‐ JuriquillaUniversidad Autónoma de Querétaro (UAQ)QuerétaroMexico
| | - Norman Mercado‐Silva
- Centro de Investigación en Biodiversidad y ConservaciónUniversidad Autónoma del Estado de MorelosCuernavacaMorelosMexico
| | - Berenit Mendoza‐Garfias
- Departamento de ZoologíaInstituto de BiologíaUniversidad Autónoma de MéxicoMexico CityMexico
| | - Amando Bautista
- Centro Tlaxcala de Biología de la ConductaUniversidad Autónoma de TlaxcalaTlaxcala de XicohténcatlTlaxcalaMexico
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168
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McLeish MJ, Fraile A, García-Arenal F. Ecological Complexity in Plant Virus Host Range Evolution. Adv Virus Res 2018; 101:293-339. [PMID: 29908592 DOI: 10.1016/bs.aivir.2018.02.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The host range of a plant virus is the number of species in which it can reproduce. Most studies of plant virus host range evolution have focused on the genetics of host-pathogen interactions. However, the distribution and abundance of plant viruses and their hosts do not always overlap, and these spatial and temporal discontinuities in plant virus-host interactions can result in various ecological processes that shape host range evolution. Recent work shows that the distributions of pathogenic and resistant genotypes, vectors, and other resources supporting transmission vary widely in the environment, producing both expected and unanticipated patterns. The distributions of all of these factors are influenced further by competitive effects, natural enemies, anthropogenic disturbance, the abiotic environment, and herbivory to mention some. We suggest the need for further development of approaches that (i) explicitly consider resource use and the abiotic and biotic factors that affect the strategies by which viruses exploit resources; and (ii) are sensitive across scales. Host range and habitat specificity will largely determine which phyla are most likely to be new hosts, but predicting which host and when it is likely to be infected is enormously challenging because it is unclear how environmental heterogeneity affects the interactions of viruses and hosts.
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Affiliation(s)
- Michael J McLeish
- Centro de Biotecnología y Genómica de Plantas UPM-INIA, and E.T.S.I. Agrícola, Alimentaria y de Biosistemas, Campus de Montegancedo, Universidad Politécnica de Madrid, Madrid, Spain
| | - Aurora Fraile
- Centro de Biotecnología y Genómica de Plantas UPM-INIA, and E.T.S.I. Agrícola, Alimentaria y de Biosistemas, Campus de Montegancedo, Universidad Politécnica de Madrid, Madrid, Spain
| | - Fernando García-Arenal
- Centro de Biotecnología y Genómica de Plantas UPM-INIA, and E.T.S.I. Agrícola, Alimentaria y de Biosistemas, Campus de Montegancedo, Universidad Politécnica de Madrid, Madrid, Spain.
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169
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Ecological opportunity may facilitate diversification in Palearctic freshwater organisms: a case study on hydrobiid gastropods. BMC Evol Biol 2018; 18:55. [PMID: 29673313 PMCID: PMC5907725 DOI: 10.1186/s12862-018-1169-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Accepted: 03/27/2018] [Indexed: 11/23/2022] Open
Abstract
Background Differences in species richness among phylogenetic clades are attributed to clade age and/or variation in diversification rates. Access to ecological opportunity may trigger a temporary increase in diversification rates and ecomorphological variation. In addition, lower body temperatures in poikilothermic animals may result in decreasing speciation rates as proposed by the metabolic theory of ecology. For strictly freshwater organisms, environmental gradients within a river continuum, linked to elevation and temperature, might promote access to ecological opportunity and alter metabolic rates, eventually influencing speciation and extinction processes. To test these hypotheses, we investigated the influence of environmental temperature and elevation, as proxies for body temperature and ecological opportunity, respectively, on speciation rates and ecomorphological divergence. As model systems served two closely related gastropod genera with unequal species richness and habitat preferences – Pseudamnicola and Corrosella. Results Lineage-through-time plots and Bayesian macroevolutionary modeling evidenced that Pseudamnicola species, which typically live in lower reaches of rivers, displayed significantly elevated speciation rates in comparison to the ‘headwater genus’ Corrosella. Moreover, state-dependent speciation models suggested that the speciation rate increased with decreasing elevation, supporting the ecological opportunity hypothesis. In contrast, a significant effect of environmental temperature, as proposed by the metabolic theory of ecology, could not be observed. Disparity-through-time plots, models of ecomorphological evolution, and ancestral habitat estimation showed for Pseudamnicola species rapid morphological divergence shortly after periods of elevational and habitat divergence. In contrast, Corrosella species did not deviate from null models of drift-like evolution. Conclusion Our finding that speciation rates are correlated with elevation and ecomorphological disparity but not with environmental temperatures suggests that differences in ecological opportunity may have played a key role in Corrosella and Pseudamnicola diversifications. We propose that Pseudamnicola lineages experienced higher ecological opportunity through dispersal to new locations or habitats in lowlands, which may explain the increase in speciation rates and morphological change. In contrast, the evolution of Corrosella in headwaters is likely less facilitated by the environment and more by non-ecological processes. Electronic supplementary material The online version of this article (10.1186/s12862-018-1169-2) contains supplementary material, which is available to authorized users.
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170
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Puttick MN. Mixed evidence for early bursts of morphological evolution in extant clades. J Evol Biol 2018; 31:502-515. [PMID: 29285828 PMCID: PMC6849586 DOI: 10.1111/jeb.13236] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 12/08/2017] [Accepted: 12/20/2017] [Indexed: 01/23/2023]
Abstract
Macroevolutionary theory predicts high rates of evolution should occur early in a clade's history as species exploit ecological opportunity. Evidence from the fossil record has shown a high prevalence of early bursts in morphological evolution, but recent work has provided little evidence for early high rates in the evolution of extant clades. Here, I test the prevalence of early bursts in extant data using phylogenetic comparative methods. Existing models are extended to allow a shift from a background Brownian motion (BM) process to an early burst process within subclades of phylogenies, rather than an early burst being applied to an entire phylogenetic tree. This nested early burst model is compared to other modes of evolution that can occur within subclades, such as evolution with a constraint (Ornstein-Uhlenbeck model) and nested BM rate shift models. These relaxed models are validated using simulations and then are applied to body size evolution of three major clades of amniotes (mammals, squamates and aves) at different levels of taxonomic organization (order, family). Applying these unconstrained models greatly increases the support for early bursts within nested subclades, and so early bursts are the most common model of evolution when only one shift is analysed. However, the relative fit of early burst models is worse than models that allow for multiple shifts of the BM or OU process. No single-shift or homogenous model is superior to models of multiple shifts in BM or OU evolution, but the patterns shown by these multirate models are generally congruent with patterns expected from early bursts.
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Affiliation(s)
- M. N. Puttick
- School of Earth SciencesBristolUK
- Department of Life SciencesNatural History MuseumLondonUK
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171
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Liu SYV, Frédérich B, Lavoué S, Chang J, Erdmann MV, Mahardika GN, Barber PH. Buccal venom gland associates with increased of diversification rate in the fang blenny fish Meiacanthus (Blenniidae; Teleostei). Mol Phylogenet Evol 2018; 125:138-146. [PMID: 29597008 DOI: 10.1016/j.ympev.2018.03.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 03/20/2018] [Accepted: 03/21/2018] [Indexed: 11/18/2022]
Abstract
At the macroevolutionary level, many mechanisms have been proposed to explain explosive species diversification. Among them morphological and/or physiological novelty is considered to have a great impact on the tempo and the mode of diversification. Meiacanthus is a genus of Blenniidae possessing a unique buccal venom gland at the base of an elongated canine tooth. This unusual trait has been hypothesized to aid escape from predation and thus potentially play an important role in their pattern of diversification. Here, we produce the first time-calibrated phylogeny of Blenniidae and we test the impact of two morphological novelties on their diversification, i.e. the presence of swim bladder and buccal venom gland, using various comparative methods. We found an increase in the tempo of lineage diversification at the root of the Meiacanthus clade, associated with the evolution of the buccal venom gland, but not the swim bladder. Neither morphological novelty was associated with the pattern of size disparification in blennies. Our results support the hypothesis that the buccal venom gland has contributed to the explosive diversification of Meiacanthus, but further analyses are needed to fully understand the factors sustaining this burst of speciation.
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Affiliation(s)
- Shang-Yin Vanson Liu
- Department of Marine Biotechnology and Resources, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
| | - Bruno Frédérich
- Laboratoire d'Océanologie, UR FOCUS, Université de Liège, 4000 Liège, Belgium
| | - Sébastien Lavoué
- Institute of Oceanography, National Taiwan University, Roosevelt Road, Taipei 10617, Taiwan
| | - Jonathan Chang
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095-7239, USA
| | - Mark V Erdmann
- Conservation International Indonesia Marine Program, 80235 Bali, Indonesia
| | - Gusti Ngurah Mahardika
- The Indonesian Biodiversity Research Centre, The Animal Biomedical and Molecular Biology Laboratory of Udayana University, Jl Sesetan-Markisa 6, Denpasar, Bali, Indonesia
| | - Paul H Barber
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, Los Angeles, CA 90095-7239, USA
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172
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Chavarie L, Howland KL, Harris LN, Hansen MJ, Harford WJ, Gallagher CP, Baillie SM, Malley B, Tonn WM, Muir AM, Krueger CC. From top to bottom: Do Lake Trout diversify along a depth gradient in Great Bear Lake, NT, Canada? PLoS One 2018; 13:e0193925. [PMID: 29566015 PMCID: PMC5863968 DOI: 10.1371/journal.pone.0193925] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 02/21/2018] [Indexed: 11/19/2022] Open
Abstract
Depth is usually considered the main driver of Lake Trout intraspecific diversity across lakes in North America. Given that Great Bear Lake is one of the largest and deepest freshwater systems in North America, we predicted that Lake Trout intraspecific diversity to be organized along a depth axis within this system. Thus, we investigated whether a deep-water morph of Lake Trout co-existed with four shallow-water morphs previously described in Great Bear Lake. Morphology, neutral genetic variation, isotopic niches, and life-history traits of Lake Trout across depths (0-150 m) were compared among morphs. Due to the propensity of Lake Trout with high levels of morphological diversity to occupy multiple habitat niches, a novel multivariate grouping method using a suite of composite variables was applied in addition to two other commonly used grouping methods to classify individuals. Depth alone did not explain Lake Trout diversity in Great Bear Lake; a distinct fifth deep-water morph was not found. Rather, Lake Trout diversity followed an ecological continuum, with some evidence for adaptation to local conditions in deep-water habitat. Overall, trout caught from deep-water showed low levels of genetic and phenotypic differentiation from shallow-water trout, and displayed higher lipid content (C:N ratio) and occupied a higher trophic level that suggested an potential increase of piscivory (including cannibalism) than the previously described four morphs. Why phenotypic divergence between shallow- and deep-water Lake Trout was low is unknown, especially when the potential for phenotypic variation should be high in deep and large Great Bear Lake. Given that variation in complexity of freshwater environments has dramatic consequences for divergence, variation in the complexity in Great Bear Lake (i.e., shallow being more complex than deep), may explain the observed dichotomy in the expression of intraspecific phenotypic diversity between shallow- vs. deep-water habitats. The ambiguity surrounding mechanisms driving divergence of Lake Trout in Great Bear Lake should be seen as reflective of the highly variable nature of ecological opportunity and divergent natural selection itself.
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Affiliation(s)
- Louise Chavarie
- Department of Fisheries and Wildlife, Center for Systems Integration and Sustainability, Michigan State University, East Lansing, MI, United States of America
- * E-mail:
| | - Kimberly L. Howland
- Fisheries and Oceans Canada, Winnipeg, Canada
- Department of Biological Sciences, University of Alberta, Edmonton, Canada
| | | | - Michael J. Hansen
- U.S. Geological Survey, Hammond Bay Biological Station, Millersburg, MI, United States of America
| | - William J. Harford
- Cooperative Institute of Marine & Atmospheric Studies, University of Miami, Miami, FL, United States of America
| | | | | | | | - William M. Tonn
- Department of Biological Sciences, University of Alberta, Edmonton, Canada
| | - Andrew M. Muir
- Great Lakes Fishery Commission, Ann Arbor, MI, United States of America
| | - Charles C. Krueger
- Department of Fisheries and Wildlife, Center for Systems Integration and Sustainability, Michigan State University, East Lansing, MI, United States of America
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173
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Diversification rates indicate an early role of adaptive radiations at the origin of modern echinoid fauna. PLoS One 2018; 13:e0194575. [PMID: 29566024 PMCID: PMC5864014 DOI: 10.1371/journal.pone.0194575] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 03/06/2018] [Indexed: 11/25/2022] Open
Abstract
Evolutionary radiations are fascinating phenomena corresponding to a dramatic diversification of taxa and a burst of cladogenesis over short periods of time. Most evolutionary radiations have long been regarded as adaptive but this has seldom been demonstrated with large-scale comparative datasets including fossil data. Originating in the Early Jurassic, irregular echinoids are emblematic of the spectacular diversification of mobile marine faunas during the Mesozoic Marine Revolution. They diversified as they colonized various habitats, and now constitute the main component of echinoid fauna in modern seas. The evolutionary radiation of irregular echinoids has long been considered as adaptive but this hypothesis has never been tested. In the present work we analyze the evolution of echinoid species richness and morphological disparity over 37 million years based on an extensive fossil dataset. Our results demonstrate that morphological and functional diversifications in certain clades of irregular echinoids were exceptionally high compared to other clades and that they were associated with the evolution of new modes of life and so can be defined as adaptive radiations. The role played by ecological opportunities in the diversification of these clades was critical, with the evolution of the infaunal mode of life promoting the adaptive radiation of irregular echinoids.
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174
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García-Navas V, Rodríguez-Rey M, Westerman M. Bursts of morphological and lineage diversification in modern dasyurids, a ‘classic’ adaptive radiation. Biol J Linn Soc Lond 2018. [DOI: 10.1093/biolinnean/bly013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Vicente García-Navas
- Department of Integrative Ecology, Estación Biológica de Doñana (EBD-CSIC), Seville, Spain
| | | | - Michael Westerman
- Department of Ecology, Environment and Evolution, LaTrobe University, Melbourne, Victoria, Australia
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175
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Morais-Silva JP, Oliveira AVD, Fabrin TMC, Diamante NA, Prioli SMAP, Frota A, Graça WJD, Prioli AJ. Geomorphology Influencing the Diversification of Fish in Small-Order Rivers of Neighboring Basins. Zebrafish 2018; 15:389-397. [PMID: 29653071 DOI: 10.1089/zeb.2017.1551] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The current analysis investigates whether the uplift of the Serra da Esperança and the Ponta Grossa Arch in the Serra Geral resulted in ichthyofaunistic changes in adjacent basins. For this, we describe the phylogeographic structure among populations of Trichomycterus collected in hydrographic basins in southern Brazil by using partial nucleotide sequences of the mitochondrial gene Cytochrome C Oxidase subunit I. Analyses revealed that the nomenclature Trichomycterus davisi fails to contain the whole genetic diversity range found in the collected specimens and indicates at least six genetic lineages in Trichomycterus. Diagnostic morphological characteristics not associated to T. davisi could be identified in some specimens from the Iguaçu Piquiri haplogroup, indicating the occurrence of species Trichomycterus stawiarski. The lack of morphological differences among the other clades clearly suggests a cryptic species case. Molecular analyses revealed at least five new species besides T. davisi in the hydrographic basins and support the interpretation that genetic structure in T. davisi species complex is explained by tectonic events intrinsic to the areas of influence of Serra da Esperança and the Ponta Grossa Arch which occurred around 1.7 My.
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Affiliation(s)
- João P Morais-Silva
- 1 Programa de Pós-graduação em Biologia Comparada, Universidade Estadual de Maringá , Maringá, Brazil
| | - Alessandra V de Oliveira
- 2 Departamento de Biotecnologia, Genética e Biologia Celular, Universidade Estadual de Maringá , Maringá, Brazil .,3 Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Universidade Estadual de Maringá , Maringá, Brazil
| | - Thomaz M C Fabrin
- 4 Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá , Maringá, Brazil
| | - Nathália Alves Diamante
- 1 Programa de Pós-graduação em Biologia Comparada, Universidade Estadual de Maringá , Maringá, Brazil
| | - Sônia M A P Prioli
- 2 Departamento de Biotecnologia, Genética e Biologia Celular, Universidade Estadual de Maringá , Maringá, Brazil .,3 Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Universidade Estadual de Maringá , Maringá, Brazil
| | - Augusto Frota
- 4 Programa de Pós-graduação em Ecologia de Ambientes Aquáticos Continentais, Universidade Estadual de Maringá , Maringá, Brazil
| | - Weferson J da Graça
- 3 Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Universidade Estadual de Maringá , Maringá, Brazil .,5 Departamento de Biologia, Universidade Estadual de Maringá , Maringá, Brazil
| | - Alberto J Prioli
- 3 Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura (Nupélia), Universidade Estadual de Maringá , Maringá, Brazil
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176
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Duchen P, Leuenberger C, Szilágyi SM, Harmon L, Eastman J, Schweizer M, Wegmann D. Inference of Evolutionary Jumps in Large Phylogenies using Lévy Processes. Syst Biol 2018; 66:950-963. [PMID: 28204787 PMCID: PMC5790141 DOI: 10.1093/sysbio/syx028] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 12/28/2016] [Indexed: 11/13/2022] Open
Abstract
Although it is now widely accepted that the rate of phenotypic evolution may not necessarily be constant across large phylogenies, the frequency and phylogenetic position of periods of rapid evolution remain unclear. In his highly influential view of evolution, G. G. Simpson supposed that such evolutionary jumps occur when organisms transition into so-called new adaptive zones, for instance after dispersal into a new geographic area, after rapid climatic changes, or following the appearance of an evolutionary novelty. Only recently, large, accurate and well calibrated phylogenies have become available that allow testing this hypothesis directly, yet inferring evolutionary jumps remains computationally very challenging. Here, we develop a computationally highly efficient algorithm to accurately infer the rate and strength of evolutionary jumps as well as their phylogenetic location. Following previous work we model evolutionary jumps as a compound process, but introduce a novel approach to sample jump configurations that does not require matrix inversions and thus naturally scales to large trees. We then make use of this development to infer evolutionary jumps in Anolis lizards and Loriinii parrots where we find strong signal for such jumps at the basis of clades that transitioned into new adaptive zones, just as postulated by Simpson’s hypothesis. [evolutionary jump; Lévy process; phenotypic evolution; punctuated equilibrium; quantitative traits.
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Affiliation(s)
- Pablo Duchen
- Faculty of Mathematics and Natural Sciences, Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
| | - Christoph Leuenberger
- Faculty of Mathematics and Natural Sciences, Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland.,Faculty of Mathematics and Natural Sciences, Department of Mathematics, University of Fribourg, Chemin du Musée 23, 1700 Fribourg, Switzerland
| | - Sándor M Szilágyi
- Faculty of Mathematics and Natural Sciences, Department of Informatics, University of Fribourg, Boulevard de Péroles 90, 1700 Fribourg, Switzerland.,Faculty of Sciences and Letters, Department of Informatics, Petru Maior University, Str. N. Iorga Nr. 1, 540088 Tîrgu Mures, Romania.,Faculty of Electrical Engineering and Informatics, Department of Control Engineering and Information Technology, Budapest University of Technology and Economics, Magyar tudósok krt. 2, H-1117 Budapest, Hungary
| | - Luke Harmon
- Department of Biological Sciences, University of Idaho, 875 Perimeter Drive MS 3051, 1700 Moscow-Idaho, United States
| | - Jonathan Eastman
- Department of Biological Sciences, University of Idaho, 875 Perimeter Drive MS 3051, 1700 Moscow-Idaho, United States
| | - Manuel Schweizer
- Naturhistorisches Museum der Burgergemeinde Bern, Bernastrasse 15, 3005 Bern, Switzerland
| | - Daniel Wegmann
- Faculty of Mathematics and Natural Sciences, Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland
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177
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Reaney AM, Saldarriaga-Córdoba M, Pincheira-Donoso D. Macroevolutionary diversification with limited niche disparity in a species-rich lineage of cold-climate lizards. BMC Evol Biol 2018; 18:16. [PMID: 29409440 PMCID: PMC5801843 DOI: 10.1186/s12862-018-1133-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 01/31/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Life diversifies via adaptive radiation when natural selection drives the evolution of ecologically distinct species mediated by their access to novel niche space, or via non-adaptive radiation when new species diversify while retaining ancestral niches. However, while cases of adaptive radiation are widely documented, examples of non-adaptively radiating lineages remain rarely observed. A prolific cold-climate lizard radiation from South America (Phymaturus), sister to a hyper-diverse adaptive radiation (Liolaemus), has extensively diversified phylogenetically and geographically, but with exceptionally minimal ecological and life-history diversification. This lineage, therefore, may offer unique opportunities to investigate the non-adaptive basis of diversification, and in combination with Liolaemus, to cover the whole spectrum of modes of diversification predicted by theory, from adaptive to non-adaptive. Using phylogenetic macroevolutionary modelling performed on a newly created 58-species molecular tree, we establish the tempo and mode of diversification in the Phymaturus radiation. RESULTS Lineage accumulation in Phymaturus opposes a density-dependent (or 'niche-filling') process of diversification. Concurrently, we found that body size diversification is better described by an Ornstein-Uhlenbeck evolutionary model, suggesting stabilizing selection as the mechanism underlying niche conservatism (i.e., maintaining two fundamental size peaks), and which has predominantly evolved around two major adaptive peaks on a 'Simpsonian' adaptive landscape. CONCLUSIONS Lineage diversification of the Phymaturus genus does not conform to an adaptive radiation, as it is characterised by a constant rate of species accumulation during the clade's history. Their strict habitat requirements (rocky outcrops), predominantly invariant herbivory, and especially the constant viviparous reproduction across species have likely limited their opportunities for adaptive diversifications throughout novel environments. This mode of diversification contrasts dramatically with its sister lineage Liolaemus, which geographically overlaps with Phymaturus, but exploits all possible microhabitats in these and other bioclimatic areas. Our study contributes importantly to consolidate these lizards (liolaemids) as promising model systems to investigate the entire spectrum of modes of species formations, from the adaptive to the non-adaptive extremes of the continuum.
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Affiliation(s)
- Ashley M. Reaney
- Laboratory of Evolutionary Ecology of Adaptations, School of Life Sciences, University of Lincoln, Brayford Campus, Lincoln, Lincolnshire LN6 7DL UK
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot, Berkshire, SL5 7PY UK
| | - Mónica Saldarriaga-Córdoba
- Centro de Investigación en Recursos Naturales y Sustentabilidad, Universidad Bernardo O’Higgins, Santiago, Chile
| | - Daniel Pincheira-Donoso
- Laboratory of Evolutionary Ecology of Adaptations, School of Life Sciences, University of Lincoln, Brayford Campus, Lincoln, Lincolnshire LN6 7DL UK
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178
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Diversification dynamics and transoceanic Eurasian-Australian disjunction in the genus Picris (Compositae) induced by the interplay of shifts in intrinsic/extrinsic traits and paleoclimatic oscillations. Mol Phylogenet Evol 2018; 119:182-195. [DOI: 10.1016/j.ympev.2017.11.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 11/15/2017] [Accepted: 11/15/2017] [Indexed: 11/22/2022]
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179
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Fox CW, Messina FJ. Evolution of larval competitiveness and associated life-history traits in response to host shifts in a seed beetle. J Evol Biol 2018; 31:302-313. [PMID: 29220874 DOI: 10.1111/jeb.13222] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 11/26/2017] [Accepted: 11/27/2017] [Indexed: 01/20/2023]
Abstract
Resource competition is frequently strong among parasites that feed within small discrete resource patches, such as seeds or fruits. The properties of a host can influence the behavioural, morphological and life-history traits of associated parasites, including traits that mediate competition within the host. For seed parasites, host size may be an especially important determinant of competitive ability. Using the seed beetle, Callosobruchus maculatus, we performed replicated, reciprocal host shifts to examine the role of seed size in determining larval competitiveness and associated traits. Populations ancestrally associated with either a small host (mung bean) or a large one (cowpea) were switched to each other's host for 36 generations. Compared to control lines (those remaining on the ancestral host), lines switched from the small host to the large host evolved greater tolerance of co-occurring larvae within seeds (indicated by an increase in the frequency of small seeds yielding two adults), smaller egg size and higher fecundity. Each change occurred in the direction predicted by the traits of populations already adapted to cowpea. However, we did not observe the expected decline in adult mass following the shift to the larger host. Moreover, lines switched from the large host (cowpea) to the small host (mung bean) did not evolve the predicted increase in larval competitiveness or egg size, but did exhibit the predicted increase in body mass. Our results thus provide mixed support for the hypothesis that host size determines the evolution of competition-related traits of seed beetles. Evolutionary responses to the two host shifts were consistent among replicate lines, but the evolution of larval competition was asymmetric, with larval competitiveness evolving as predicted in one direction of host shift, but not the reverse. Nevertheless, our results indicate that switching hosts is sufficient to produce repeatable and rapid changes in the competition strategy and fitness-related traits of insect populations.
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Affiliation(s)
- C W Fox
- Department of Entomology, University of Kentucky, Lexington, KY, USA
| | - F J Messina
- Department of Biology, Utah State University, Logan, UT, USA
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180
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Kagawa K, Takimoto G. Hybridization can promote adaptive radiation by means of transgressive segregation. Ecol Lett 2017; 21:264-274. [PMID: 29243294 DOI: 10.1111/ele.12891] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 08/07/2017] [Accepted: 11/08/2017] [Indexed: 01/17/2023]
Abstract
Understanding the mechanisms of rapid adaptive radiation has been a central problem of evolutionary ecology. Recently, there is a growing recognition that hybridization between different evolutionary lineages can facilitate adaptive radiation by creating novel phenotypes. Yet, theoretical plausibility of this hypothesis remains unclear because, for example, hybridization can negate pre-existing species richness. Here, we theoretically investigate whether and under what conditions hybridization promotes ecological speciation and adaptive radiation using an individual-based model to simulate genome evolution following hybridization between two allopatrically evolved lineages. The model demonstrated that transgressive segregation through hybridization can facilitate adaptive radiation, most powerfully when novel vacant ecological niches are highly dissimilar, phenotypic effect size of mutations is small and there is moderate genetic differentiation between parental lineages. These results provide a theoretical basis for the effect of hybridization facilitating adaptive radiation.
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Affiliation(s)
- Kotaro Kagawa
- The Institute of Statistical Mathematics, 10-3 Midori-cho, Tachikawa, Tokyo, 190-8562, Japan.,Department of Fish Ecology and Evolution, Center for Ecology, Evolution & Biogeochemistry, Swiss Federal Institute of Aquatic Science and Technology, 6047, Kastanienbaum, Switzerland
| | - Gaku Takimoto
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
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181
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Blom MPK, Horner P, Moritz C. Convergence across a continent: adaptive diversification in a recent radiation of Australian lizards. Proc Biol Sci 2017; 283:rspb.2016.0181. [PMID: 27306048 DOI: 10.1098/rspb.2016.0181] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 05/19/2016] [Indexed: 12/11/2022] Open
Abstract
Recent radiations are important to evolutionary biologists, because they provide an opportunity to study the mechanisms that link micro- and macroevolution. The role of ecological speciation during adaptive radiation has been intensively studied, but radiations can arise from a diversity of evolutionary processes; in particular, on large continental landmasses where allopatric speciation might frequently precede ecological differentiation. It is therefore important to establish a phylogenetic and ecological framework for recent continental-scale radiations that are species-rich and ecologically diverse. Here, we use a genomic (approx. 1 200 loci, exon capture) approach to fit branch lengths on a summary-coalescent species tree and generate a time-calibrated phylogeny for a recent and ecologically diverse radiation of Australian scincid lizards; the genus Cryptoblepharus We then combine the phylogeny with a comprehensive phenotypic dataset for over 800 individuals across the 26 species, and use comparative methods to test whether habitat specialization can explain current patterns of phenotypic variation in ecologically relevant traits. We find significant differences in morphology between species that occur in distinct environments and convergence in ecomorphology with repeated habitat shifts across the continent. These results suggest that isolated analogous habitats have provided parallel ecological opportunity and have repeatedly promoted adaptive diversification. By contrast, speciation processes within the same habitat have resulted in distinct lineages with relatively limited morphological variation. Overall, our study illustrates how alternative diversification processes might have jointly stimulated species proliferation across the continent and generated a remarkably diverse group of Australian lizards.
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Affiliation(s)
- Mozes P K Blom
- Research School of Biology, The Australian National University, Canberra ACT 0200, Australia
| | - Paul Horner
- Museum and Art Gallery of the Northern Territory, GPO Box 4646, Darwin NT 0801, Australia
| | - Craig Moritz
- Research School of Biology, The Australian National University, Canberra ACT 0200, Australia
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182
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Gunter HM, Schneider RF, Karner I, Sturmbauer C, Meyer A. Molecular investigation of genetic assimilation during the rapid adaptive radiations of East African cichlid fishes. Mol Ecol 2017; 26:6634-6653. [PMID: 29098748 DOI: 10.1111/mec.14405] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 08/06/2017] [Accepted: 08/24/2017] [Indexed: 12/19/2022]
Abstract
Adaptive radiations are characterized by adaptive diversification intertwined with rapid speciation within a lineage resulting in many ecologically specialized, phenotypically diverse species. It has been proposed that adaptive radiations can originate from ancestral lineages with pronounced phenotypic plasticity in adaptive traits, facilitating ecologically driven phenotypic diversification that is ultimately fixed through genetic assimilation of gene regulatory regions. This study aimed to investigate how phenotypic plasticity is reflected in gene expression patterns in the trophic apparatus of several lineages of East African cichlid fishes, and whether the observed patterns support genetic assimilation. This investigation used a split brood experimental design to compare adaptive plasticity in species from within and outside of adaptive radiations. The plastic response was induced in the crushing pharyngeal jaws through feeding individuals either a hard or soft diet. We find that nonradiating, basal lineages show higher levels of adaptive morphological plasticity than the derived, radiated lineages, suggesting that these differences have become partially genetically fixed during the formation of the adaptive radiations. Two candidate genes that may have undergone genetic assimilation, gif and alas1, were identified, in addition to alterations in the wiring of LPJ patterning networks. Taken together, our results suggest that genetic assimilation may have dampened the inducibility of plasticity related genes during the adaptive radiations of East African cichlids, flattening the reaction norms and canalizing their feeding phenotypes, driving adaptation to progressively more narrow ecological niches.
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Affiliation(s)
- Helen M Gunter
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Konstanz, Germany.,Zukunftskolleg, University of Konstanz, Konstanz, Germany
| | - Ralf F Schneider
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Konstanz, Germany.,International Max Planck Research School for Organismal Biology, University of Konstanz, Konstanz, Germany
| | | | | | - Axel Meyer
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Konstanz, Germany.,International Max Planck Research School for Organismal Biology, University of Konstanz, Konstanz, Germany.,Radcliffe Institute for Advanced Study, Harvard University, Cambridge, MA, USA
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183
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Jahner JP, Forister ML, Parchman TL, Smilanich AM, Miller JS, Wilson JS, Walla TR, Tepe EJ, Richards LA, Quijano‐Abril MA, Glassmire AE, Dyer LA. Host conservatism, geography, and elevation in the evolution of a Neotropical moth radiation. Evolution 2017; 71:2885-2900. [DOI: 10.1111/evo.13377] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 09/12/2017] [Accepted: 09/20/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Joshua P. Jahner
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
| | - Matthew L. Forister
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
| | - Thomas L. Parchman
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
| | - Angela M. Smilanich
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
| | - James S. Miller
- Division of Invertebrate Zoology American Museum of Natural History New York New York 10024
| | | | - Thomas R. Walla
- Department of Biology Colorado Mesa University Grand Junction Colorado 81507
- Seccion Invertebrados Museo Ecuatoriano de Ciencias Naturales Quito Ecuador
| | - Eric J. Tepe
- Department of Biological Sciences University of Cincinnati Cincinnati Ohio 45221
| | - Lora A. Richards
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
| | | | - Andrea E. Glassmire
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
| | - Lee A. Dyer
- Program in Ecology, Evolution, and Conservation Biology, Department of Biology University of Nevada Reno Nevada 89557
- Seccion Invertebrados Museo Ecuatoriano de Ciencias Naturales Quito Ecuador
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184
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Individuals of the common Namib Day Gecko vary in how adaptive simplification alters sprint biomechanics. Sci Rep 2017; 7:15595. [PMID: 29142272 PMCID: PMC5688112 DOI: 10.1038/s41598-017-15459-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 10/24/2017] [Indexed: 11/08/2022] Open
Abstract
Locomotion inextricably links biomechanics to ecology as animals maneuver through mechanically challenging environments. Faster individuals are more likely to escape predators, surviving to produce more offspring. Fast sprint speed evolved several times in lizards, including geckos. However, the underlying mechanisms determining performance await discovery in many clades. Novel morphological structures influence these mechanisms by adding complexity to the government of locomotion. Gecko adhesion coevolves with modified muscles, tendons, and reflexes. We explored how the Namib Day Gecko, Rhoptropus afer, sprints on ecologically relevant substrates. Locomotion requires that many moving parts of the animal work together; we found knee and ankle extension are the principal drivers of speed on a level surface while contributions to sprinting uphill are more evenly distributed among motions of the femur, knee, and ankle. Although geckos are thought to propel themselves with specialized, proximally located muscles that retract and rotate the femur, we show with path analysis that locomotion is altered in this secondarily terrestrial gecko. We present evidence of intraspecific variation in the use of adhesive toe pads and suggest that the subdigital adhesive toe pad may increase sprint speed in this species. We argue kinematics coevolve with the secondarily terrestrial lifestyle of this species.
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185
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Burress ED, Tan M. Ecological opportunity alters the timing and shape of adaptive radiation. Evolution 2017; 71:2650-2660. [PMID: 28895124 DOI: 10.1111/evo.13362] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 08/18/2017] [Accepted: 08/27/2017] [Indexed: 12/14/2022]
Abstract
The uneven distribution of diversity is a conspicuous phenomenon across the tree of life. Ecological opportunity is a prominent catalyst of adaptive radiation and therefore may alter patterns of diversification. We evaluated the distribution of shifts in diversification rates across the cichlid phylogeny and the distribution of major clades across phylogenetic space. We also tested if ecological opportunity influenced these patterns. Colonization-associated ecological opportunity altered the tempo and mode of diversification during the adaptive radiation of cichlid fishes. Clades that arose following colonization events diversified faster than other clades. Speciation rate shifts were nonrandomly distributed across the phylogeny such that they were disproportionally concentrated around nodes that corresponded with colonization events (i.e., of continents, river basins, or lakes). Young clades tend to expand faster than older clades; however, colonization-associated ecological opportunity accentuated this pattern. There was an interaction between clade age and ecological opportunity that explained the trajectory of clades through phylogenetic space over time. Our results indicate that ecological opportunities afforded by continental and ecosystem-scale colonization events explain the dramatic speciation rate heterogeneity and phylogenetic imbalance that arose during the evolutionary history of cichlid fishes.
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Affiliation(s)
- Edward D Burress
- Department of Biological Sciences and Auburn University Museum of Natural History, Auburn University, Auburn, Alabama
| | - Milton Tan
- Division of Infectious Diseases, School of Medicine, Emory University, Atlanta, Georgia
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186
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Mandeville EG, Parchman TL, Thompson KG, Compton RI, Gelwicks KR, Song SJ, Buerkle CA. Inconsistent reproductive isolation revealed by interactions between Catostomus fish species. Evol Lett 2017; 1:255-268. [PMID: 30283654 PMCID: PMC6121845 DOI: 10.1002/evl3.29] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 08/09/2017] [Indexed: 12/19/2022] Open
Abstract
Interactions between species are central to evolution and ecology, but we do not know enough about how outcomes of interactions between species vary across geographic locations, in heterogeneous environments, or over time. Ecological dimensions of interactions between species are known to vary, but evolutionary interactions such as the establishment and maintenance of reproductive isolation are often assumed to be consistent across instances of an interaction between species. Hybridization among Catostomus fish species occurs over a large and heterogeneous geographic area and across taxa with distinct evolutionary histories, which allows us to assess consistency in species interactions. We analyzed hybridization among six Catostomus species across the Upper Colorado River basin (US mountain west) and found extreme variation in hybridization across locations. Different hybrid crosses were present in different locations, despite similar species assemblages. Within hybrid crosses, hybridization varied from only first generation hybrids to extensive hybridization with backcrossing. Variation in hybridization outcomes might result from uneven fitness of hybrids across locations, polymorphism in genetic incompatibilities, chance, unidentified historical contingencies, or some combination thereof. Our results suggest caution in assuming that one or a few instances of hybridization represent all interactions between the focal species, as species interactions vary substantially across locations.
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Affiliation(s)
| | | | | | | | | | - Se Jin Song
- Department of Ecology and Evolutionary Biology University of Colorado Boulder Colorado 80309
| | - C Alex Buerkle
- Department of Botany and Program in Ecology University of Wyoming Laramie Wyoming 82071
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187
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Passow CN, Arias-Rodriguez L, Tobler M. Convergent evolution of reduced energy demands in extremophile fish. PLoS One 2017; 12:e0186935. [PMID: 29077740 PMCID: PMC5659789 DOI: 10.1371/journal.pone.0186935] [Citation(s) in RCA: 14] [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: 01/09/2017] [Accepted: 10/10/2017] [Indexed: 11/19/2022] Open
Abstract
Convergent evolution in organismal function can arise from nonconvergent changes in traits that contribute to that function. Theory predicts that low resource availability and high maintenance costs in extreme environments select for reductions in organismal energy demands, which could be attained through modifications of body size or metabolic rate. We tested for convergence in energy demands and underlying traits by investigating livebearing fish (genus Poecilia) that have repeatedly colonized toxic, hydrogen sulphide-rich springs. We quantified variation in body size and routine metabolism across replicated sulphidic and non-sulphidic populations in nature, modelled total organismal energy demands, and conducted a common-garden experiment to test whether population differences had a genetic basis. Sulphidic populations generally exhibited smaller body sizes and lower routine metabolic rates compared to non-sulphidic populations, which together caused significant reductions in total organismal energy demands in extremophile populations. Although both mechanisms contributed to variation in organismal energy demands, variance partitioning indicated reductions of body size overall had a greater effect than reductions of routine metabolism. Finally, population differences in routine metabolism documented in natural populations were maintained in common-garden reared individuals, indicating evolved differences. In combination with other studies, these results suggest that reductions in energy demands may represent a common theme in adaptation to physiochemical stressors. Selection for reduced energy demand may particularly affect body size, which has implications for life history evolution in extreme environments.
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Affiliation(s)
- Courtney N. Passow
- Division of Biology, Kansas State University, Manhattan, Kansas, United States of America
- * E-mail:
| | - Lenin Arias-Rodriguez
- División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, México
| | - Michael Tobler
- Division of Biology, Kansas State University, Manhattan, Kansas, United States of America
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188
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Wright DF. Phenotypic Innovation and Adaptive Constraints in the Evolutionary Radiation of Palaeozoic Crinoids. Sci Rep 2017; 7:13745. [PMID: 29062117 PMCID: PMC5653864 DOI: 10.1038/s41598-017-13979-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 10/04/2017] [Indexed: 11/28/2022] Open
Abstract
To better understand the patterns and processes shaping large-scale phenotypic diversification, I integrate palaeobiological and phylogenetic perspectives to investigate a ~200-million-year radiation using a global sample of Palaeozoic crinoid echinoderms. Results indicate the early history of crinoid diversification is characterized by early burst dynamics with decelerating morphologic rates. However, in contrast with expectation for a single “early burst” model, morphospace continued to expand following a slowdown in rates. In addition, I find evidence for an isolated peak in morphologic rates occurring late in the clade’s history. This episode of elevated rates is not associated with increased disparity, morphologic novelty, or the radiation of a single subclade. Instead, this episode of elevated rates involved multiple subclade radiations driven by environmental change toward a pre-existing adaptive optimum. The decoupling of morphologic disparity with rates of change suggests phenotypic rates are primarily shaped by ecologic factors rather than the origination of morphologic novelty alone. These results suggest phenotypic diversification is far more complex than models commonly assumed in comparative biology. Furthermore, palaeontological disparity patterns are not a reliable proxy for rates after an initial diversifying phase. These issues highlight the need for continued synthesis between fossil and phylogenetic approaches to macroevolution.
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Affiliation(s)
- David F Wright
- Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20013, USA.
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189
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Erwin DH. Developmental push or environmental pull? The causes of macroevolutionary dynamics. HISTORY AND PHILOSOPHY OF THE LIFE SCIENCES 2017; 39:36. [PMID: 29039031 DOI: 10.1007/s40656-017-0163-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Have the large-scale evolutionary patterns illustrated by the fossil record been driven by fluctuations in environmental opportunity, by biotic factors, or by changes in the types of phenotypic variants available for evolutionary change? Since the Modern Synthesis most evolutionary biologists have maintained that microevolutionary processes carrying on over sufficient time will generate macroevolutionary patterns, with no need for other pattern-generating mechanisms such as punctuated equilibrium or species selection. This view was challenged by paleontologists in the 1970s with proposals that the differential sorting and selection of species and clades, and the effects of biotic crises such as mass extinctions, were important extensions to traditional evolutionary theory. More recently those interested in macroevolution have debated the relative importance of abiotic and biotic factors in driving macroevolutionary patterns and have introduced comparative phylogenetic methods to analyze the rates of change in taxonomic diversity. Applying Peter Godfrey-Smith's distinction between distributional explanations and explanations focusing on the origin of variation, most macroevolutionary studies have provided distributional explanations of macroevolutionary patterns. Comparative studies of developmental evolution, however, have implicated the origin of variants as a driving macroevolution force. In particular, the repatterning of gene regulatory networks provides new insights into the origins of developmental novelties. This raises the question of whether macroevolution has been pulled by the generation of environmental opportunity, or pushed by the introduction of new morphologies. The contrast between distributional and origination scenarios has implications for understanding evolutionary novelty and innovation and how macroevolutionary process may have evolved over time.
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Affiliation(s)
- Douglas H Erwin
- Department of Paleobiology, MRC-121, National Museum of Natural History, Washington, DC, 20013-7012, USA.
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190
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Peter Linder H, Bouchenak-Khelladi Y. Adaptive radiations should not be simplified: The case of the danthonioid grasses. Mol Phylogenet Evol 2017; 117:179-190. [PMID: 28987638 DOI: 10.1016/j.ympev.2017.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 10/02/2017] [Accepted: 10/04/2017] [Indexed: 01/02/2023]
Abstract
Although much of extant diversity is probably the product of evolutionary radiations, the special case of adaptive radiations has not yet been thoroughly explored. Adaptive radiations are postulated to occur when a lineage is exposed to new ecological opportunities, where it can diversify ecologically. We argue that adaptive radiations have two characteristics. Firstly, the diversification rate accelerates initially, and is then followed by a density-dependent slow-down. Secondly, traits relevant to the new ecological opportunity should evolve at or just before the radiation. We also argue that a correct identification of adaptive radiations is dependent on the phylogenies underlying the diversification dynamics being sampled adequately (i.e. comprehensive species sampling), and that the traits should be treated continuously if they exhibit a biological continuum and not be over-simplified into binary traits. Here, we test the hypothesis that much of the extant diversity of the south-temperate grass subfamily Danthonioideae is the result of two geographically separated but contemporaneous adaptive radiations, in response to Late-Miocene-Pliocene aridification and increasingly seasonal climates. We show that both Pentameris (83 African species) and Rytidosperma (73 Australasian-South American species) exhibit accelerations in diversification rates followed by linear density-dependent declines. We also show that two selected traits show differential evolutionary regimes with different evolutionary optima, and that these are linked to changes in the diversification rate. These results are consistent with these being adaptive, and putatively parallel, radiations. However, by mapping traits over the whole danthonioid phylogeny, it is evident that no identified trait or trait combination is sufficient and necessary for adaptive radiations. Furthermore, we show that simplifying the traits to binary gives a strong but potentially erroneous link between trait shift and diversification rate shift.
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Affiliation(s)
- H Peter Linder
- Institute of Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, Zurich 8008, Switzerland
| | - Yanis Bouchenak-Khelladi
- Institute of Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, Zurich 8008, Switzerland.
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191
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Lundsgaard-Hansen B, Matthews B, Aebischer T, Seehausen O. The Legacy of Ecosystem Effects Caused by Adaptive Radiation. COPEIA 2017. [DOI: 10.1643/ce-16-514] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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192
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Rossoni DM, Assis APA, Giannini NP, Marroig G. Intense natural selection preceded the invasion of new adaptive zones during the radiation of New World leaf-nosed bats. Sci Rep 2017; 7:11076. [PMID: 28894101 PMCID: PMC5593990 DOI: 10.1038/s41598-017-08989-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 07/20/2017] [Indexed: 01/04/2023] Open
Abstract
The family Phyllostomidae, which evolved in the New World during the last 30 million years, represents one of the largest and most morphologically diverse mammal families. Due to its uniquely diverse functional morphology, the phyllostomid skull is presumed to have evolved under strong directional selection; however, quantitative estimation of the strength of selection in this extraordinary lineage has not been reported. Here, we used comparative quantitative genetics approaches to elucidate the processes that drove cranial evolution in phyllostomids. We also quantified the strength of selection and explored its association with dietary transitions and specialization along the phyllostomid phylogeny. Our results suggest that natural selection was the evolutionary process responsible for cranial diversification in phyllostomid bats. Remarkably, the strongest selection in the phyllostomid phylogeny was associated with dietary specialization and the origination of novel feeding habits, suggesting that the adaptive diversification of phyllostomid bats was triggered by ecological opportunities. These findings are consistent with Simpson’s quantum evolutionary model of transitions between adaptive zones. The multivariate analyses used in this study provides a powerful tool for understanding the role of evolutionary processes in shaping phenotypic diversity in any group on both micro- and macroevolutionary scales.
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Affiliation(s)
- Daniela M Rossoni
- Department of Genetics and Evolutionary Biology, Biosciences Institute, University of São Paulo, Rua do Matão, 277, 05508-900, São Paulo, Brazil.
| | - Ana Paula A Assis
- Department of Ecology, Biosciences Institute, University of São Paulo, Rua do Matão, 277, 05508-900, São Paulo, Brazil
| | - Norberto P Giannini
- Unidad Ejecutora Lillo-CONICET, Miguel Lillo 251, Universidad Nacional de Tucumán, Tucumán, 4000, Argentina
| | - Gabriel Marroig
- Department of Genetics and Evolutionary Biology, Biosciences Institute, University of São Paulo, Rua do Matão, 277, 05508-900, São Paulo, Brazil
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193
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The Integrated Genomic Architecture and Evolution of Dental Divergence in East African Cichlid Fishes ( Haplochromis chilotes x H. nyererei). G3-GENES GENOMES GENETICS 2017; 7:3195-3202. [PMID: 28751505 PMCID: PMC5592944 DOI: 10.1534/g3.117.300083] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The independent evolution of the two toothed jaws of cichlid fishes is thought to have promoted their unparalleled ecological divergence and species richness. However, dental divergence in cichlids could exhibit substantial genetic covariance and this could dictate how traits like tooth numbers evolve in different African Lakes and on their two jaws. To test this hypothesis, we used a hybrid mapping cross of two trophically divergent Lake Victoria species (Haplochromis chilotes × Haplochromis nyererei) to examine genomic regions associated with cichlid tooth diversity. Surprisingly, a similar genomic region was found to be associated with oral jaw tooth numbers in cichlids from both Lake Malawi and Lake Victoria. Likewise, this same genomic location was associated with variation in pharyngeal jaw tooth numbers. Similar relationships between tooth numbers on the two jaws in both our Victoria hybrid population and across the phylogenetic diversity of Malawi cichlids additionally suggests that tooth numbers on the two jaws of haplochromine cichlids might generally coevolve owing to shared genetic underpinnings. Integrated, rather than independent, genomic architectures could be key to the incomparable evolutionary divergence and convergence in cichlid tooth numbers.
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194
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Sarnat EM, Friedman NR, Fischer G, Lecroq-Bennet B, Economo EP. Rise of the spiny ants: diversification, ecology and function of extreme traits in the hyperdiverse genus Pheidole (Hymenoptera: Formicidae). Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx081] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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195
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Unique parallel radiations of high-mountainous species of the genus Sedum (Crassulaceae) on the continental island of Taiwan. Mol Phylogenet Evol 2017; 113:9-22. [DOI: 10.1016/j.ympev.2017.03.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 03/29/2017] [Accepted: 03/31/2017] [Indexed: 02/02/2023]
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196
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Uit de Weerd DR, Fernández Velázquez A. Pinning down Tenuistemma (Pulmonata: Urocoptidae): local evolution of an extreme shell type. Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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197
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Vidal-García M, Scott Keogh J. Phylogenetic conservatism in skulls and evolutionary lability in limbs - morphological evolution across an ancient frog radiation is shaped by diet, locomotion and burrowing. BMC Evol Biol 2017; 17:165. [PMID: 28693418 PMCID: PMC5504843 DOI: 10.1186/s12862-017-0993-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Accepted: 06/07/2017] [Indexed: 11/23/2022] Open
Abstract
Background Quantifying morphological diversity across taxa can provide valuable insight into evolutionary processes, yet its complexities can make it difficult to identify appropriate units for evaluation. One of the challenges in this field is identifying the processes that drive morphological evolution, especially when accounting for shape diversification across multiple structures. Differential levels of co-varying phenotypic diversification can conceal selective pressures on traits due to morphological integration or modular shape evolution of different structures, where morphological evolution of different modules is explained either by co-variation between them or by independent evolution, respectively. Methods Here we used a 3D geometric morphometric approach with x-ray micro CT scan data of the skull and bones of forelimbs and hindlimbs of representative species from all 21 genera of the ancient Australo-Papuan myobatrachid frogs and analysed their shape both as a set of distinct modules and as a multi-modular integrative structure. We then tested three main questions: (i) are evolutionary patterns and the amount and direction of morphological changes similar in different structures and subfamilies?, (ii) do skulls and limbs show different levels of integration?, and (iii) is morphological diversity of skulls and limbs shaped by diet, locomotion, burrowing behavior, and ecology?. Results Our results in both skulls and limbs support a complex evolutionary pattern typical of an adaptive radiation with an early burst of phenotypic variation followed by slower rates of morphological change. Skull shape diversity was phylogenetically conserved and correlated with diet whereas limb shape was more labile and associated with diet, locomotion, and burrowing behaviour. Morphological changes between different limb bones were highly correlated, depicting high morphological integration. In contrast, overall limb and skull shape displayed semi-independence in morphological evolution, indicating modularity. Conclusions Our results illustrate how morphological diversification in animal clades can follow complex processes, entailing selective pressures from the environment as well as multiple trait covariance with varying degrees of independence across different structures. We suggest that accurately quantifying shape diversity across multiple structures is crucial in order to understand complex evolutionary processes. Electronic supplementary material The online version of this article (doi:10.1186/s12862-017-0993-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Marta Vidal-García
- Research School of Biology, The Australian National University, Canberra, Australia.
| | - J Scott Keogh
- Research School of Biology, The Australian National University, Canberra, Australia
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198
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Recknagel H, Hooker OE, Adams CE, Elmer KR. Ecosystem size predicts eco-morphological variability in a postglacial diversification. Ecol Evol 2017; 7:5560-5570. [PMID: 28811875 PMCID: PMC5552947 DOI: 10.1002/ece3.3013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 03/08/2017] [Accepted: 03/26/2017] [Indexed: 02/03/2023] Open
Abstract
Identifying the processes by which new phenotypes and species emerge has been a long‐standing effort in evolutionary biology. Young adaptive radiations provide a model to study patterns of morphological and ecological diversification in environmental context. Here, we use the recent radiation (ca. 12k years old) of the freshwater fish Arctic charr (Salvelinus alpinus) to identify abiotic and biotic environmental factors associated with adaptive morphological variation. Arctic charr are exceptionally diverse, and in postglacial lakes there is strong evidence of repeated parallel evolution of similar morphologies associated with foraging. We measured head depth (a trait reflecting general eco‐morphology and foraging ecology) of 1,091 individuals across 30 lake populations to test whether fish morphological variation was associated with lake bathymetry and/or ecological parameters. Across populations, we found a significant relationship between the variation in head depth of the charr and abiotic environmental characteristics: positively with ecosystem size (i.e., lake volume, surface area, depth) and negatively with the amount of littoral zone. In addition, extremely robust‐headed phenotypes tended to be associated with larger and deeper lakes. We identified no influence of co‐existing biotic community on Arctic charr trophic morphology. This study evidences the role of the extrinsic environment as a facilitator of rapid eco‐morphological diversification.
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Affiliation(s)
- Hans Recknagel
- Institute of Biodiversity Animal Health & Comparative Medicine College of Medical, Veterinary & Life Sciences University of Glasgow Glasgow UK
| | - Oliver E Hooker
- Institute of Biodiversity Animal Health & Comparative Medicine College of Medical, Veterinary & Life Sciences University of Glasgow Glasgow UK.,PR Statistics Glasgow UK
| | - Colin E Adams
- Institute of Biodiversity Animal Health & Comparative Medicine College of Medical, Veterinary & Life Sciences University of Glasgow Glasgow UK
| | - Kathryn R Elmer
- Institute of Biodiversity Animal Health & Comparative Medicine College of Medical, Veterinary & Life Sciences University of Glasgow Glasgow UK
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199
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Calcagno V, Jarne P, Loreau M, Mouquet N, David P. Diversity spurs diversification in ecological communities. Nat Commun 2017; 8:15810. [PMID: 28598423 PMCID: PMC5494188 DOI: 10.1038/ncomms15810] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 05/05/2017] [Indexed: 11/19/2022] Open
Abstract
Diversity is a fundamental, yet threatened, property of ecological systems. The idea that diversity can itself favour diversification, in an autocatalytic process, is very appealing but remains controversial. Here, we study a generalized model of ecological communities and investigate how the level of initial diversity influences the possibility of evolutionary diversification. We show that even simple models of intra- and inter-specific ecological interactions can predict a positive effect of diversity on diversification: adaptive radiations may require a threshold number of species before kicking-off. We call this phenomenon DDAR (diversity-dependent adaptive radiations) and identify mathematically two distinct pathways connecting diversity to diversification, involving character displacement and the positive diversity-productivity relationship. Our results may explain observed delays in adaptive radiations at the macroscale and diversification patterns reported in experimental microbial communities, and shed new light on the dynamics of ecological diversity, the diversity-dependence of diversification rates, and the consequences of biodiversity loss. Diversification may be driven by diversity, a concept Calcagno et al. explore using models of intra- and inter-specific ecological interactions. A threshold number of species is sometimes required before adaptive radiations can occur; a phenomenon they term diversity-dependent adaptive radiation.
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Affiliation(s)
- Vincent Calcagno
- Université Côte d'Azur, CNRS, INRA, ISA, Sophia Antipolis 06900, France
| | - Philippe Jarne
- CEFE UMR 5175, CNRS-Univ. of Montpellier-Univ. P. Valery Montp.-EPHE, Montpellier 34090, France
| | - Michel Loreau
- Theoretical and Experimental Ecology Station, CNRS-Univ. Paul Sabatier, Moulis 09200, France
| | - Nicolas Mouquet
- MARBEC, CNRS-IFREMER-IRD-Univ. of Montpellier, Montpellier 34095, France
| | - Patrice David
- CEFE UMR 5175, CNRS-Univ. of Montpellier-Univ. P. Valery Montp.-EPHE, Montpellier 34090, France
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200
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Shift from slow- to fast-water habitats accelerates lineage and phenotype evolution in a clade of Neotropical suckermouth catfishes (Loricariidae: Hypoptopomatinae). PLoS One 2017; 12:e0178240. [PMID: 28591189 PMCID: PMC5462362 DOI: 10.1371/journal.pone.0178240] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 05/10/2017] [Indexed: 11/24/2022] Open
Abstract
Identifying habitat characteristics that accelerate organismal evolution is essential to understanding both the origins of life on Earth and the ecosystem properties that are most critical to maintaining life into the future. Searching for these characteristics on a large scale has only recently become possible via advances in phylogenetic reconstruction, time-calibration, and comparative analyses. In this study, we combine these tools with habitat and phenotype data for 105 species in a clade of Neotropical suckermouth catfishes commonly known as cascudinhos. Our goal was to determine whether riverine mesohabitats defined by different flow rates (i.e., pools vs. rapids) and substrates (plants vs. rocks) have affected rates of cascudinho cladogenesis and morphological diversification. In contrast to predictions based on general theory related to life in fast-flowing, rocky riverine habitats, Neoplecostomini lineages associated with these habitats exhibited increased body size, head shape diversity, and lineage and phenotype diversification rates. These findings are consistent with a growing understanding of river rapids as incubators of biological diversification and specialization. They also highlight the urgent need to conserve rapids habitats throughout the major rivers of the world.
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