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Babiychuk E, Teixeira JG, Tyski L, Guimaraes JTF, Romeiro LA, da Silva EF, Dos Santos JF, Vasconcelos S, da Silva DF, Castilho A, Siqueira JO, Fonseca VLI, Kushnir S. Geography is essential for reproductive isolation between florally diversified morning glory species from Amazon canga savannahs. Sci Rep 2019; 9:18052. [PMID: 31792228 PMCID: PMC6889514 DOI: 10.1038/s41598-019-53853-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 11/06/2019] [Indexed: 11/29/2022] Open
Abstract
The variety, relative importance and eco-evolutionary stability of reproductive barriers are critical to understanding the processes of speciation and species persistence. Here we evaluated the strength of the biotic prezygotic and postzygotic isolation barriers between closely related morning glory species from Amazon canga savannahs. The flower geometry and flower visitor assemblage analyses supported pollination by the bees in lavender-flowered Ipomoea marabaensis and recruitment of hummingbirds as pollinators in red-flowered Ipomoea cavalcantei. Nevertheless, native bee species and alien honeybees foraged on flowers of both species. Real-time interspecific hybridization underscored functionality of the overlap in flower visitor assemblages, questioning the strength of prezygotic isolation underpinned by diversification in flower colour and geometry. Interspecific hybrids were fertile and produced offspring in nature. No significant asymmetry in interspecific hybridization and hybrid incompatibilities among offspring were found, indicating weak postmating and postzygotic isolation. The results suggested that despite floral diversification, the insular-type geographic isolation remains a major barrier to gene flow. Findings set a framework for the future analysis of contemporary evolution of plant-pollinator networks at the population, community, and ecosystem levels in tropical ecosystems that are known to be distinct from the more familiar temperate climate models.
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Affiliation(s)
- Elena Babiychuk
- Instituto Tecnológico Vale, Rua Boaventura da Silva 955, CEP 66055-090, Belém, Pará, Brazil.
| | | | - Lourival Tyski
- Parque Zoobotânico Vale, VALE S.A., Rod. Raimundo Mascarenhas, Km 26, S/N., Núcleo Urbano de Carajás, CEP 68516-000, Parauapebas, Pará, Brazil
| | | | - Luiza Araújo Romeiro
- Instituto Tecnológico Vale, Rua Boaventura da Silva 955, CEP 66055-090, Belém, Pará, Brazil
| | | | | | - Santelmo Vasconcelos
- Instituto Tecnológico Vale, Rua Boaventura da Silva 955, CEP 66055-090, Belém, Pará, Brazil
| | - Delmo Fonseca da Silva
- Parque Zoobotânico Vale, VALE S.A., Rod. Raimundo Mascarenhas, Km 26, S/N., Núcleo Urbano de Carajás, CEP 68516-000, Parauapebas, Pará, Brazil
| | - Alexandre Castilho
- Gerência de Meio Ambiente, Departamento de Ferrosos Corredor Norte, Vale S.A., Rua Guamá n 60, Núcleo Urbano, CEP 68516-000, Parauapebas, Pará, Brazil
| | - José Oswaldo Siqueira
- Instituto Tecnológico Vale, Rua Boaventura da Silva 955, CEP 66055-090, Belém, Pará, Brazil
| | | | - Sergei Kushnir
- Unaffiliated, Belém, Pará, Brazil.,Teagasc, Crop Science Department, Oak Park, Carlow, R93 XE12, Ireland
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102
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Le Maitre NC, Pirie MD, Bellstedt DU. Floral Color, Anthocyanin Synthesis Gene Expression and Control in Cape Erica Species. FRONTIERS IN PLANT SCIENCE 2019; 10:1565. [PMID: 31850039 PMCID: PMC6892755 DOI: 10.3389/fpls.2019.01565] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 11/07/2019] [Indexed: 05/31/2023]
Abstract
Introduction: The Cape Floristic Region (CFR) is a biodiversity hotspot, recognized globally for its unusually high levels of endemism. The origins of this biodiversity are a long-standing topic of research. The largest "Cape clade," Erica, radiated dramatically in the CFR, its ca. 690 species arising within 10-15 Ma. Notable between- and within-species flower color variation in Erica may have contributed to the origins of species diversity through its impact on pollinator efficiency and specificity. Methods: We investigate the expression and function of the genes of the anthocyanin biosynthesis pathway that controls floral color in 12 Erica species groups using RT-qPCR and UPLC-MS/MS. Results: Shifts from ancestral pink- or red- to white- and/or yellow flowers were associated with independent losses of single pathway gene expression, abrogation of the entire pathway due to loss of the expression of a transcription factor or loss of function mutations in pathway genes. Discussion: Striking floral color shifts are prevalent amongst the numerous species of Cape Erica. These results show independent origins of a palette of mutations leading to such shifts, revealing the diverse genetic basis for potentially rapid evolution of a speciation-relevant trait.
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Affiliation(s)
- N C Le Maitre
- Bellstedt Laboratory, Department of Biochemistry, Stellenbosch University, Stellenbosch, South Africa
| | - Michael David Pirie
- Johannes Gutenberg-Universität, Mainz, Mainz, Germany
- University Museum, University of Bergen, Bergen, Norway
| | - Dirk U. Bellstedt
- Bellstedt Laboratory, Department of Biochemistry, Stellenbosch University, Stellenbosch, South Africa
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103
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Brown J, Cunningham SA. Global-scale drivers of crop visitor diversity and the historical development of agriculture. Proc Biol Sci 2019; 286:20192096. [PMID: 31744437 PMCID: PMC6892048 DOI: 10.1098/rspb.2019.2096] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Understanding diversity in flower-visitor assemblages helps us improve pollination of crops and support better biodiversity conservation outcomes. Much recent research has focused on drivers of crop-visitor diversity operating over spatial scales from fields to landscapes, such as pesticide and habitat management, while drivers operating over larger scales of continents and biogeographic realms are virtually unknown. Flower and visitor traits influence attraction of pollinators to flowers, and evolve in the context of associations that can be ancient or recent. Plants that have been adopted into agriculture have been moved widely around the world and thereby exposed to new flower visitors. Remarkably little is known of the consequence of these historical patterns for present-day crop-visiting bee diversity. We analyse data from 317 studies of 27 crops worldwide and find that crops are visited by fewer bee genera outside their region of origin and outside their family's region of origin. Thus, recent human history and the deeper evolutionary history of crops and bees appear to be important determinants of flower-visitor diversity at large scales that constrain the levels of visitor diversity that can be influenced by field- and landscape-scale interventions.
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Affiliation(s)
- Julian Brown
- Fenner School of Environment and Society, Australian National University, 141 Linnaeus Way, Acton, Australian Capital Territory 2601, Australia
| | - Saul A Cunningham
- Fenner School of Environment and Society, Australian National University, 141 Linnaeus Way, Acton, Australian Capital Territory 2601, Australia
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104
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Wang A, Peng Y, Harder LD, Huang J, Yang D, Zhang D, Liao W. The nature of interspecific interactions and co-diversification patterns, as illustrated by the fig microcosm. THE NEW PHYTOLOGIST 2019; 224:1304-1315. [PMID: 31494940 PMCID: PMC6856861 DOI: 10.1111/nph.16176] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 09/02/2019] [Indexed: 05/05/2023]
Abstract
Interactions between mutualists, competitors, and antagonists have contrasting ecological effects that, sustained over generations, can influence micro- and macroevolution. Dissimilar benefits and costs for these interactions should cause contrasting co-diversification patterns between interacting clades, with prevalent co-speciation by mutualists, association loss by competitors, and host switching by antagonists. We assessed these expectations for a local assemblage of 26 fig species (Moraceae: Ficus), 26 species of mutualistic (pollinating), and 33 species of parasitic (galling) wasps (Chalcidoidea). Using newly acquired gene sequences, we inferred the phylogenies for all three clades. We then compared the three possible pairs of phylogenies to assess phylogenetic congruence and the relative frequencies of co-speciation, association duplication, switching, and loss. The paired phylogenies of pollinators with their mutualists and competitors were significantly congruent, unlike that of figs and their parasites. The distributions of macroevolutionary events largely agreed with expectations for mutualists and antagonists. By contrast, that for competitors involved relatively frequent association switching, as expected, but also unexpectedly frequent co-speciation. The latter result likely reflects the heterogeneous nature of competition among fig wasps. These results illustrate the influence of different interspecific interactions on co-diversification, while also revealing its dependence on specific characteristics of those interactions.
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Affiliation(s)
- Ai‐Ying Wang
- State Key Laboratory of Earth Surface Processes and Resource EcologyMinistry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringBeijing Normal UniversityBeijingChina
| | - Yan‐Qiong Peng
- CAS Key Laboratory of Tropical Forest EcologyXishuangbanna Tropical Botanical GardenChinese Academy of SciencesKunmingChina
| | - Lawrence D. Harder
- Department of Biological SciencesUniversity of Calgary2500 University Drive NWCalgaryABCanada
| | - Jian‐Feng Huang
- CAS Key Laboratory of Tropical Forest EcologyXishuangbanna Tropical Botanical GardenChinese Academy of SciencesKunmingChina
| | - Da‐Rong Yang
- CAS Key Laboratory of Tropical Forest EcologyXishuangbanna Tropical Botanical GardenChinese Academy of SciencesKunmingChina
| | - Da‐Yong Zhang
- State Key Laboratory of Earth Surface Processes and Resource EcologyMinistry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringBeijing Normal UniversityBeijingChina
| | - Wan‐Jin Liao
- State Key Laboratory of Earth Surface Processes and Resource EcologyMinistry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringBeijing Normal UniversityBeijingChina
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105
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Minnaar C, de Jager ML, Anderson B. Intraspecific divergence in floral-tube length promotes asymmetric pollen movement and reproductive isolation. THE NEW PHYTOLOGIST 2019; 224:1160-1170. [PMID: 31148172 DOI: 10.1111/nph.15971] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 05/14/2019] [Indexed: 06/09/2023]
Abstract
The causative link between phenotypic divergence and reproductive isolation is an important but poorly understood part of ecological speciation. We studied the effects of floral-tube length variation on pollen placement/receipt positions and reproductive isolation. In a population of Lapeirousia anceps (Iridaceae) with bimodal floral-tube lengths, we labelled pollen of short- and long-tubed flowers with different colour fluorescent nanoparticles (quantum dots). This enabled us to map pollen placement by long- and short-tubed flowers on the only floral visitor, a long-proboscid fly. Furthermore, it allowed us to quantify pollen movement within and between short- and long-tubed flowers. Short- and long-tubed flowers placed pollen on different parts of the pollinator, and long-tubed flowers placed more pollen per visit than short-tubed flowers. This resulted in assortative pollen receipt (most pollen received comes from the same phenotype) and strong but asymmetric reproductive isolation, where short-tubed plants are more reproductively isolated than long-tubed plants. These results suggest that floral-tube length divergence can promote mechanical isolation in plants through divergence in pollen placement sites on pollinators. Consequently, in concert with other reproductive isolation mechanisms, selection for differences in floral-tube length can play an important role in ecological speciation of plants.
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Affiliation(s)
- Corneile Minnaar
- Department of Botany & Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Marinus L de Jager
- Department of Botany & Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Bruce Anderson
- Department of Botany & Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
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106
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Muchhala N. Quantum dots shed light on angiosperm speciation. THE NEW PHYTOLOGIST 2019; 224:1005-1008. [PMID: 31631364 DOI: 10.1111/nph.16211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
- Nathan Muchhala
- Biology Department, University of Missouri - St Louis, One University Boulevard, 223 Research Hall, St Louis, MO, 63121, USA
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107
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Grantham MA, Ford BA, Worley AC. Pollination and fruit set in two rewardless slipper orchids and their hybrids (Cypripedium, Orchidaceae): large yellow flowers outperform small white flowers in the northern tall grass prairie. PLANT BIOLOGY (STUTTGART, GERMANY) 2019; 21:997-1007. [PMID: 31276285 DOI: 10.1111/plb.13026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 07/01/2019] [Indexed: 06/09/2023]
Abstract
Species with rewardless flowers often have low fruit to flower ratios, although wide temporal and spatial variation in fruiting success can occur. We compared floral phenotypes, insect visitors and fruiting success in four populations of the small white (Cypripedium candidum) and yellow (C. parviflorum) lady's slipper orchids and their hybrids near the northern extent of North America's tall grass prairie. Flower and fruit numbers were observed for two seasons on marked individuals (n = 1811). Floral traits were measured on 82-140 individuals per taxon and analysed in relation to fruiting success. All insects found inside flowers were collected, inspected for pollen smears and measured for comparison to floral features. Among orchid taxa, C. candidum had the smallest flowers, lowest number and variety of insect visitors, and lowest fruit to flower ratios. These measures were intermediate in hybrids and highest in C. parviflorum, despite low flower numbers in the latter. Within orchid taxa, fruit number was positively related to flower number, but fruit to flower ratios decreased slightly, as would be expected if pollinators left unrewarding patches. Potential pollinators included the dipteran Odontomyia pubescens and hymenopterans Andrena spp., Apis mellifera and Lasioglossum zonulum. Cypripedium parviflorum had a reproductive advantage over C. candidum across multiple populations and years. Hybrids showed segregation for floral traits, and hybrid fruiting success increased with a deeper intensity of yellow pigment and larger escape routes for floral visitors. These same attributes likely contributed to the relatively high fruit set in C. parviflorum in the study region.
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Affiliation(s)
- M A Grantham
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | - B A Ford
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
| | - A C Worley
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
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108
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Kahnt B, Hattingh WN, Theodorou P, Wieseke N, Kuhlmann M, Glennon KL, Niet T, Paxton R, Cron GV. Should I stay or should I go? Pollinator shifts rather than cospeciation dominate the evolutionary history of South African
Rediviva
bees and their
Diascia
host plants. Mol Ecol 2019; 28:4118-4133. [DOI: 10.1111/mec.15154] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 06/19/2019] [Indexed: 12/20/2022]
Affiliation(s)
- Belinda Kahnt
- General Zoology Institute of Biology Martin‐Luther‐University Halle‐Wittenberg Halle (Saale) Germany
| | - Wesley N. Hattingh
- School of Animal, Plant and Environmental Sciences University of the Witwatersrand Braamfontein South Africa
| | - Panagiotis Theodorou
- General Zoology Institute of Biology Martin‐Luther‐University Halle‐Wittenberg Halle (Saale) Germany
| | - Nicolas Wieseke
- Institute for Informatics University of Leipzig Leipzig Germany
| | - Michael Kuhlmann
- Zoological Museum Kiel University Kiel Germany
- Department of Life Sciences Natural History Museum London UK
| | - Kelsey L. Glennon
- School of Animal, Plant and Environmental Sciences University of the Witwatersrand Braamfontein South Africa
| | - Timotheüs Niet
- School of Life Sciences Centre for Functional Biodiversity University of Kwazulu‐Natal Pietermaritzburg South Africa
| | - Robert Paxton
- General Zoology Institute of Biology Martin‐Luther‐University Halle‐Wittenberg Halle (Saale) Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐Leipzig Leipzig Germany
| | - Glynis V. Cron
- School of Animal, Plant and Environmental Sciences University of the Witwatersrand Braamfontein South Africa
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109
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Theron GL, de Waal C, Barrett SCH, Anderson B. Geographic variation of reproductive traits and competition for pollinators in a bird-pollinated plant. Ecol Evol 2019; 9:10122-10134. [PMID: 31673331 PMCID: PMC6816071 DOI: 10.1002/ece3.5457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 04/25/2019] [Accepted: 05/28/2019] [Indexed: 11/19/2022] Open
Abstract
Geographic variation in the reproductive traits of animal-pollinated plants can be shaped by spatially variable selection imposed by differences in the local pollination environment. We investigated this process in Babiana ringens (Iridaceae), an enigmatic species from the Western Cape region of South Africa. B. ringens has evolved a specialized perch facilitating cross-pollination by sunbirds and displays striking geographic variation in perch size and floral traits. Here, we investigate whether this variation can be explained by geographic differences in the pollinator communities. We measured floral and inflorescence traits, and abiotic variables (N, P, C, and rainfall) and made observations of sunbirds in populations spanning the range of B. ringens. In each population, we recorded sunbird species identity and measured visitation rates, interfloral pollen transfer, and whether the seed set of flowers was pollen limited. To evaluate whether competition from co-occurring sunbird-pollinated species might reduce visitation, we quantified nectar rewards in B. ringens and of other co-flowering bird-pollinated species in local communities in which populations occurred. Variation in abiotic variables was not associated with geographical variation of traits in B. ringens. Malachite sunbirds were the dominant visitor (97% of visits) and populations with larger-sized traits exhibited higher visitation rates, more between-flower pollen transfer and set more seed. No sunbirds were observed in four populations, all with smaller-sized traits. Sunbird visitation to B. ringens was not associated with local sunbird activity in communities, but sunbird visitation was negatively associated with the amount of B. ringens sugar relative to the availability of alternative nectar sources. Our study provides evidence that B. ringens populations with larger floral traits are visited more frequently by sunbirds, and we propose that visitation rates to B. ringens may be influenced, in part, by competition with other sunbird-pollinated species.
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Affiliation(s)
- Genevieve L. Theron
- Department of Botany and ZoologyStellenbosch UniversityMatielandSouth Africa
| | - Caroli de Waal
- Department of Botany and ZoologyStellenbosch UniversityMatielandSouth Africa
| | | | - Bruce Anderson
- Department of Botany and ZoologyStellenbosch UniversityMatielandSouth Africa
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110
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Wu Y, Zhang ZQ, Li QJ. Nectar robbers influence the trait-fitness relationship of Primula secundiflora. PLANT BIOLOGY (STUTTGART, GERMANY) 2019; 21:967-974. [PMID: 31050864 DOI: 10.1111/plb.13000] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
The trait-fitness relationship influences the strength and direction of floral evolution. To fully understand and predict the evolutionary trajectories of floral traits, it is critical to disentangle the direct and indirect effects of floral traits on plant fitness in natural populations. We experimentally quantified phenotypic selection on floral traits through female fitness and estimated the casual effects of nectar robbing with different nectar robbing intensities on trait-fitness relationships in both the L- (long-style and short-anther phenotype) and S-morph (short-style and long-anther phenotype) flowers among Primula secundiflora populations. A larger number of flowers and wider corolla tubes had both direct and indirect positive effects on female fitness in the P. secundiflora populations. The indirect effects of these two traits on female fitness were mediated by nectar robbers. The indirect effect of the number of flowers on female fitness increased with increasing nectar robbing intensity. In most populations, the direct and/or indirect effects of floral traits on female fitness were stronger in the S-morph flowers than in the L-morph flowers. In addition, nectar robbers had a direct positive effect on female fitness, but this effect varied between the L- and S-morph flowers. These results show the potential role of nectar robbers in influencing the trait-fitness relationships in this primrose species.
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Affiliation(s)
- Y Wu
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology, Yunnan University, Kunming, China
- Laboratory of Ecology and Evolutionary Biology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, China
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China
| | - Z-Q Zhang
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology, Yunnan University, Kunming, China
- Laboratory of Ecology and Evolutionary Biology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, China
| | - Q-J Li
- Yunnan Key Laboratory of Plant Reproductive Adaption and Evolutionary Ecology, Yunnan University, Kunming, China
- Laboratory of Ecology and Evolutionary Biology, State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, China
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111
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Souto‐Vilarós D, Machac A, Michalek J, Darwell CT, Sisol M, Kuyaiva T, Isua B, Weiblen GD, Novotny V, Segar ST. Faster speciation of fig‐wasps than their host figs leads to decoupled speciation dynamics: Snapshots across the speciation continuum. Mol Ecol 2019; 28:3958-3976. [DOI: 10.1111/mec.15190] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 06/19/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Daniel Souto‐Vilarós
- Faculty of Science University of South Bohemia České Budějovice Czech Republic
- Biology Centre of the Czech Academy of Sciences Institute of Entomology České Budějovice Czech Republic
| | - Antonin Machac
- Center for Theoretical Study Charles University and Czech Academy of Sciences Prague Czech Republic
- Department of Ecology Charles University Prague Czech Republic
- Center for Macroecology, Evolution and Climate Natural History Museum of Denmark University of Copenhagen Copenhagen Denmark
- Biodiversity Research Centre University of British Columbia Vancouver BC Canada
| | - Jan Michalek
- Biology Centre of the Czech Academy of Sciences Institute of Entomology České Budějovice Czech Republic
| | | | - Mentap Sisol
- New Guinea Binatang Research Centre Madang Papua New Guinea
| | - Thomas Kuyaiva
- New Guinea Binatang Research Centre Madang Papua New Guinea
| | - Brus Isua
- New Guinea Binatang Research Centre Madang Papua New Guinea
| | - George D. Weiblen
- Institute on the Environment University of Minnesota Saint Paul MN USA
| | - Vojtech Novotny
- Biology Centre of the Czech Academy of Sciences Institute of Entomology České Budějovice Czech Republic
- New Guinea Binatang Research Centre Madang Papua New Guinea
| | - Simon T. Segar
- Biology Centre of the Czech Academy of Sciences Institute of Entomology České Budějovice Czech Republic
- Department of Crop and Environment Sciences Harper Adams University Newport UK
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112
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He T, Lamont BB, Pausas JG. Fire as a key driver of Earth's biodiversity. Biol Rev Camb Philos Soc 2019; 94:1983-2010. [PMID: 31298472 DOI: 10.1111/brv.12544] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/19/2019] [Accepted: 06/21/2019] [Indexed: 12/21/2022]
Abstract
Many terrestrial ecosystems are fire prone, such that their composition and structure are largely due to their fire regime. Regions subject to regular fire have exceptionally high levels of species richness and endemism, and fire has been proposed as a major driver of their diversity, within the context of climate, resource availability and environmental heterogeneity. However, current fire-management practices rarely take into account the ecological and evolutionary roles of fire in maintaining biodiversity. Here, we focus on the mechanisms that enable fire to act as a major ecological and evolutionary force that promotes and maintains biodiversity over numerous spatiotemporal scales. From an ecological perspective, the vegetation, topography and local weather conditions during a fire generate a landscape with spatial and temporal variation in fire-related patches (pyrodiversity), and these produce the biotic and environmental heterogeneity that drives biodiversity across local and regional scales. There have been few empirical tests of the proposition that 'pyrodiversity begets biodiversity' but we show that biodiversity should peak at moderately high levels of pyrodiversity. Overall species richness is greatest immediately after fire and declines monotonically over time, with postfire successional pathways dictated by animal habitat preferences and varying lifespans among resident plants. Theory and data support the 'intermediate disturbance hypothesis' when mean patch species diversity is correlated with mean fire intervals. Postfire persistence, recruitment and immigration allow species with different life histories to coexist. From an evolutionary perspective, fire drives population turnover and diversification by promoting a wide range of adaptive responses to particular fire regimes. Among 39 comparisons, the number of species in 26 fire-prone lineages is much higher than that in their non-fire-prone sister lineages. Fire and its byproducts may have direct mutagenic effects, producing novel genotypes that can lead to trait innovation and even speciation. A paradigm shift aimed at restoring biodiversity-maintaining fire regimes across broad landscapes is required among the fire research and management communities. This will require ecologists and other professionals to spread the burgeoning fire-science knowledge beyond scientific publications to the broader public, politicians and media.
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Affiliation(s)
- Tianhua He
- School of Molecular and Life Sciences, Curtin University, Perth, Australia.,College of Science, Health, Engineering and Education, Murdoch University, Murdoch, Australia
| | - Byron B Lamont
- School of Molecular and Life Sciences, Curtin University, Perth, Australia
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113
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Valverde J, Perfectti F, Gómez JM. Pollination effectiveness in a generalist plant: adding the genetic component. THE NEW PHYTOLOGIST 2019; 223:354-365. [PMID: 30761538 DOI: 10.1111/nph.15743] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
The pollination effectiveness of a flower visitor has traditionally been measured as the product of a quantity component that depends on the frequency of interaction and a quality component that measures the per-visit effects on plant reproduction. We propose that this could be complemented with a genetic component informing about each pollinator's contribution to the genetic diversity and composition of the plant progeny. We measured the quantity and quality components of effectiveness of most pollinator functional groups of the generalist herb Erysimum mediohispanicum. We used 10 microsatellite markers to calculate the genetic component as the diversity of sires among siblings and included it into the calculation of the pollination effectiveness. Functional groups varied in the quantity and quality components, which were shown to be decoupled. Functional groups also differed in the genetic component. This component changed the estimates of pollination effectiveness, increasing the differences between some functional groups and modifying the pollination effectiveness landscape. We demonstrate that including the genetic component in the calculation of the pollination effectiveness may allow a more complete quantification of the contribution of each pollinator to the reproductive success of a plant, providing information on its mating patterns and long-term fitness.
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Affiliation(s)
- Javier Valverde
- Departamento de Ecología, Universidad de Granada, ES-18071, Granada, Spain
| | - Francisco Perfectti
- Departamento de Genética and Unidad de Excelencia 'Modeling Nature', Universidad de Granada, ES-18071, Granada, Spain
| | - José María Gómez
- Departamento de Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas (EEZA-CSIC), ES-04120, Almería, Spain
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Lehnert M, Krug M. Evolution of substrate specificity and fungal symbiosis in filmy ferns (Hymenophyllaceae): a Bayesian approach for ambiguous character state reconstruction. Symbiosis 2019. [DOI: 10.1007/s13199-018-00594-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Maron JL, Agrawal AA, Schemske DW. Plant–herbivore coevolution and plant speciation. Ecology 2019; 100:e02704. [DOI: 10.1002/ecy.2704] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/20/2019] [Accepted: 03/04/2019] [Indexed: 11/09/2022]
Affiliation(s)
- John L. Maron
- Division of Biological Sciences University of Montana Missoula Montana 59812 USA
| | - Anurag A. Agrawal
- Department of Ecology and Evolutionary Biology Cornell University Ithaca New York 14853 USA
| | - Douglas W. Schemske
- Department of Plant Biology Michigan State University East Lansing Michigan 48824 USA
- W. K. Kellogg Biological Station Michigan State University Hickory Corners Michigan 49060 USA
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Segar ST, Volf M, Sisol M, Pardikes NA, Souto-Vilarós D. Chemical cues and genetic divergence in insects on plants: conceptual cross pollination between mutualistic and antagonistic systems. CURRENT OPINION IN INSECT SCIENCE 2019; 32:83-90. [PMID: 31113637 DOI: 10.1016/j.cois.2018.11.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 11/20/2018] [Accepted: 11/25/2018] [Indexed: 06/09/2023]
Abstract
Cascading or reciprocal genetic diversification of herbivores, parasitoids, and pollinators can track chemotypic variation in host resources, and can lead to non-overlapping communities. Because plants simultaneously interact with both pollinators and herbivores, models investigating the genetic divergence of antagonistic herbivores and mutualistic pollinators should be merged in order to study how both processes interact using a common conceptual and methodological approach. We expect insects to mediate divergence in many systems, with outcomes depending on the level of pollinator or herbivore specialisation, and the relative selective pressures they impose. Applying approaches widely used to study insect pollinators, for example genomic tools and integration of behavioural, genetic and chemical data, to both pollinators and herbivores in the same system will facilitate our understanding of patterns of genetic divergence across multiple interacting species.
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Affiliation(s)
- Simon T Segar
- Biology Centre, Czech Academy of Sciences, Ceske Budejovice, Czech Republic; Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic; Department of Crop and Environment Sciences, Harper Adams University, UK.
| | - Martin Volf
- Molecular Interaction Ecology Group, German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Mentap Sisol
- New Guinea Binatang Research Centre, Madang, Papua New Guinea
| | | | - Daniel Souto-Vilarós
- Biology Centre, Czech Academy of Sciences, Ceske Budejovice, Czech Republic; Faculty of Science, University of South Bohemia, Ceske Budejovice, Czech Republic
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Vasconcelos TNC, Chartier M, Prenner G, Martins AC, Schönenberger J, Wingler A, Lucas E. Floral uniformity through evolutionary time in a species-rich tree lineage. THE NEW PHYTOLOGIST 2019; 221:1597-1608. [PMID: 30284282 DOI: 10.1111/nph.15453] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
Changes in floral morphology are expected across evolutionary time and are often promoted as important drivers in angiosperm diversification. Such a statement, however, is in contrast to empirical observations of species-rich lineages that show apparent conservative floral morphologies even under strong selective pressure to change from their environments. Here, we provide quantitative evidence for prolific speciation despite uniform floral morphology in a tropical species-rich tree lineage. We analyse floral disparity in the environmental and phylogenetic context of Myrcia (Myrtaceae), one of the most diverse and abundant tree genera in Neotropical biomes. Variation in floral morphology among Myrcia clades is exceptionally low, even among distantly related species. Discrete floral specialisations do occur, but these are few, present low phylogenetic signal, have no strong correlation with abiotic factors, and do not affect overall macroevolutionary dynamics in the lineage. Results show that floral form and function may be conserved over large evolutionary time scales even in environments full of opportunities for ecological interactions and niche specialisation. Species accumulation in diverse lineages with uniform flowers apparently does not result from shifts in pollination strategies, but from speciation mechanisms that involve other, nonfloral plant traits.
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Affiliation(s)
- Thais N C Vasconcelos
- Jodrell Laboratory, Comparative Plant and Fungal Biology Department, Royal Botanic Gardens Kew, Richmond, TW9 3DS, UK
- Laboratório de Sistemética Vegetal, Departamento de Botânica, Universidade de São Paulo, São Paulo, SP 05508- 090, Brazil
| | - Marion Chartier
- Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, Vienna, 1030, Austria
| | - Gerhard Prenner
- Jodrell Laboratory, Comparative Plant and Fungal Biology Department, Royal Botanic Gardens Kew, Richmond, TW9 3DS, UK
| | - Aline C Martins
- Departamento de Botânica, Centro Politécnico, Universidade Federal do Paraná, Curitiba, PR 81531-980, Brazil
| | - Jürg Schönenberger
- Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, Vienna, 1030, Austria
| | - Astrid Wingler
- School of Biological, Earth & Environmental Sciences and Environmental Research Institute, University College Cork, Distillery Fields, North Mall, Cork, T23 XA50, Ireland
| | - Eve Lucas
- Jodrell Laboratory, Comparative Plant and Fungal Biology Department, Royal Botanic Gardens Kew, Richmond, TW9 3DS, UK
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Trunschke J, Sletvold N, Ågren J. The independent and combined effects of floral traits distinguishing two pollination ecotypes of a moth-pollinated orchid. Ecol Evol 2019; 9:1191-1201. [PMID: 30805152 PMCID: PMC6374684 DOI: 10.1002/ece3.4808] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/22/2018] [Accepted: 11/01/2018] [Indexed: 11/26/2022] Open
Abstract
Identifying traits and agents of selection involved in local adaptation is important for understanding population divergence. In southern Sweden, the moth-pollinated orchid Platanthera bifolia occurs as a woodland and a grassland ecotype that differ in dominating pollinators. The woodland ecotype is taller (expected to influence pollinator attraction) and produces flowers with longer spurs (expected to influence efficiency of pollen transfer) compared to the grassland ecotype. We examined whether plant height and spur length affect pollination and reproductive success in a woodland population, and whether effects are non-additive, as expected for traits influencing two multiplicative components of pollen transfer. We reduced plant height and spur length to match trait values observed in the grassland ecotype and determined the effects on pollen removal, pollen receipt, and fruit production. In addition, to examine the effects of naturally occurring variation, we quantified pollinator-mediated selection through pollen removal and seed production in the same population. Reductions of plant height and spur length decreased pollen removal, number of flowers receiving pollen, mean pollen receipt per pollinated flower, and fruit production per plant, but no significant interaction effect was detected. The selection analysis demonstrated pollinator-mediated selection for taller plants via female fitness. However, there was no current selection mediated by pollinators on spur length, and pollen removal was not related to plant height or spur length. The results show that, although both traits are important for pollination success and female fitness in the woodland habitat, only plant height was sufficiently variable in the study population for current pollinator-mediated selection to be detected. More generally, the results illustrate how a combination of experimental approaches can be used to identify both traits and agents of selection.
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Affiliation(s)
- Judith Trunschke
- Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology CentreUppsala UniversityUppsalaSweden
| | - Nina Sletvold
- Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology CentreUppsala UniversityUppsalaSweden
| | - Jon Ågren
- Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology CentreUppsala UniversityUppsalaSweden
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120
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Ollerton J, Liede-Schumann S, Endress ME, Meve U, Rech AR, Shuttleworth A, Keller HA, Fishbein M, Alvarado-Cárdenas LO, Amorim FW, Bernhardt P, Celep F, Chirango Y, Chiriboga-Arroyo F, Civeyrel L, Cocucci A, Cranmer L, da Silva-Batista IC, de Jager L, Deprá MS, Domingos-Melo A, Dvorsky C, Agostini K, Freitas L, Gaglianone MC, Galetto L, Gilbert M, González-Ramírez I, Gorostiague P, Goyder D, Hachuy-Filho L, Heiduk A, Howard A, Ionta G, Islas-Hernández SC, Johnson SD, Joubert L, Kaiser-Bunbury CN, Kephart S, Kidyoo A, Koptur S, Koschnitzke C, Lamborn E, Livshultz T, Machado IC, Marino S, Mema L, Mochizuki K, Morellato LPC, Mrisha CK, Muiruri EW, Nakahama N, Nascimento VT, Nuttman C, Oliveira PE, Peter CI, Punekar S, Rafferty N, Rapini A, Ren ZX, Rodríguez-Flores CI, Rosero L, Sakai S, Sazima M, Steenhuisen SL, Tan CW, Torres C, Trøjelsgaard K, Ushimaru A, Vieira MF, Wiemer AP, Yamashiro T, Nadia T, Queiroz J, Quirino Z. The diversity and evolution of pollination systems in large plant clades: Apocynaceae as a case study. ANNALS OF BOTANY 2019; 123:311-325. [PMID: 30099492 PMCID: PMC6344220 DOI: 10.1093/aob/mcy127] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 07/10/2018] [Indexed: 05/09/2023]
Abstract
BACKGROUND AND AIMS Large clades of angiosperms are often characterized by diverse interactions with pollinators, but how these pollination systems are structured phylogenetically and biogeographically is still uncertain for most families. Apocynaceae is a clade of >5300 species with a worldwide distribution. A database representing >10 % of species in the family was used to explore the diversity of pollinators and evolutionary shifts in pollination systems across major clades and regions. METHODS The database was compiled from published and unpublished reports. Plants were categorized into broad pollination systems and then subdivided to include bimodal systems. These were mapped against the five major divisions of the family, and against the smaller clades. Finally, pollination systems were mapped onto a phylogenetic reconstruction that included those species for which sequence data are available, and transition rates between pollination systems were calculated. KEY RESULTS Most Apocynaceae are insect pollinated with few records of bird pollination. Almost three-quarters of species are pollinated by a single higher taxon (e.g. flies or moths); 7 % have bimodal pollination systems, whilst the remaining approx. 20 % are insect generalists. The less phenotypically specialized flowers of the Rauvolfioids are pollinated by a more restricted set of pollinators than are more complex flowers within the Apocynoids + Periplocoideae + Secamonoideae + Asclepiadoideae (APSA) clade. Certain combinations of bimodal pollination systems are more common than others. Some pollination systems are missing from particular regions, whilst others are over-represented. CONCLUSIONS Within Apocynaceae, interactions with pollinators are highly structured both phylogenetically and biogeographically. Variation in transition rates between pollination systems suggest constraints on their evolution, whereas regional differences point to environmental effects such as filtering of certain pollinators from habitats. This is the most extensive analysis of its type so far attempted and gives important insights into the diversity and evolution of pollination systems in large clades.
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Affiliation(s)
- Jeff Ollerton
- Faculty of Arts, Science and Technology, University of Northampton, Northampton, UK
- For correspondence. E-mail:
| | | | - Mary E Endress
- Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland
| | - Ulrich Meve
- Lehrstuhl für Pflanzensystematik, Universität Bayreuth, Bayreuth, Germany
| | - André Rodrigo Rech
- Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Curso de Licenciatura em Educação do Campo - LEC, Campus JK - Diamantina, Minas Gerais, Brazil
| | - Adam Shuttleworth
- School of Life Sciences, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South Africa
| | - Héctor A Keller
- Instituto de Botánica del Nordeste, UNNE-CONICET, Corrientes, Argentina
| | - Mark Fishbein
- Department of Plant Biology, Ecology, and Evolution, Stillwater, OK, USA
| | | | - Felipe W Amorim
- Laboratório de Ecologia da Polinização e Interações – LEPI, Departamento de Botânica, Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho”- Unesp, Botucatu - SP, Brazil
| | - Peter Bernhardt
- Saint Louis University, Department of Biology, St. Louis, MO, USA
| | - Ferhat Celep
- Mehmet Akif Ersoy Mah. 269. Cad. Urankent Prestij Konutları, Demetevler, Ankara, Turkey
| | - Yolanda Chirango
- Department of Biological Sciences, University of Cape Town, Rondebosch, Cape Town, South Africa
| | | | - Laure Civeyrel
- EDB, UMR 5174, Université de Toulouse, UPS, Toulouse cedex, France
| | - Andrea Cocucci
- Laboratorio de Ecología Evolutiva - Biología Floral, IMBIV (UNC-CONICET), Argentina
| | - Louise Cranmer
- Faculty of Arts, Science and Technology, University of Northampton, Northampton, UK
| | - Inara Carolina da Silva-Batista
- Departamento de Botânica, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, Rio de Janiero, RJ, Brazil
| | - Linde de Jager
- Department of Plant Sciences, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein, South Africa
| | - Mariana Scaramussa Deprá
- Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes-RJ, Brazil
| | - Arthur Domingos-Melo
- Departamento de Botânica - CB, Laboratório de Biologia Floral e Reprodutiva - POLINIZAR, Universidade Federal de Pernambuco, Recife - PE, Brazil
| | - Courtney Dvorsky
- Saint Louis University, Department of Biology, St. Louis, MO, USA
| | - Kayna Agostini
- Universidade Federal de São Carlos - UFSCar, Centro de Ciências Agrárias, Depto. Ciências da Natureza, Matemática e Educação, Araras, SP, Brazil
| | - Leandro Freitas
- Jardim Botânico do Rio de Janeiro, Rio de Janeiro - RJ, Brazil
| | - Maria Cristina Gaglianone
- Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes-RJ, Brazil
| | - Leo Galetto
- Facultad de Ciencias Exactas, Fisicas y Naturales, Universidad Nacional de Córdoba (UNC) and IMBIV (CONICET-UNC). CP, Córdoba, Argentina
| | - Mike Gilbert
- Herbarium - Royal Botanic Gardens, Kew, Richmond, Surrey, UK
| | - Ixchel González-Ramírez
- Laboratorio de Plantas Vasculares, Departamento de Biología Comparada, Facultad de Ciencias, UNAM, Mexico
| | - Pablo Gorostiague
- Laboratorio de Investigaciones Botánicas (LABIBO), Facultad de Ciencias Naturales, Universidad Nacional de Salta-CONICET. Salta, Argentina
| | - David Goyder
- Herbarium - Royal Botanic Gardens, Kew, Richmond, Surrey, UK
| | - Leandro Hachuy-Filho
- Laboratório de Ecologia da Polinização e Interações – LEPI, Departamento de Botânica, Instituto de Biociências, Universidade Estadual Paulista “Júlio de Mesquita Filho”- Unesp, Botucatu - SP, Brazil
| | - Annemarie Heiduk
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Aaron Howard
- Biology Department, Franklin and Marshall College, Lancaster, PA, USA
| | - Gretchen Ionta
- Natural History Museum, Georgia College, Milledgeville, GA, USA
| | - Sofia C Islas-Hernández
- Laboratorio de Plantas Vasculares, Departamento de Biología Comparada, Facultad de Ciencias, UNAM, Mexico
| | - Steven D Johnson
- School of Life Sciences, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South Africa
| | - Lize Joubert
- Department of Plant Sciences, Faculty of Natural and Agricultural Sciences, University of the Free State, Bloemfontein, South Africa
| | | | - Susan Kephart
- Department of Biology, Willamette University Salem, OR, USA
| | - Aroonrat Kidyoo
- Department of Botany, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand
| | - Suzanne Koptur
- Natural History Museum, Georgia College, Milledgeville, GA, USA
| | - Cristiana Koschnitzke
- Departamento de Botânica, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, Rio de Janiero, RJ, Brazil
| | - Ellen Lamborn
- Faculty of Arts, Science and Technology, University of Northampton, Northampton, UK
| | - Tatyana Livshultz
- Department of Biodiversity Earth and Environmental Sciences and Academy of Natural Sciences, Drexel University, Philadephia, PA, USA
| | - Isabel Cristina Machado
- Departamento de Botânica - CB, Laboratório de Biologia Floral e Reprodutiva - POLINIZAR, Universidade Federal de Pernambuco, Recife - PE, Brazil
| | - Salvador Marino
- Laboratorio de Ecología Evolutiva - Biología Floral, IMBIV (UNC-CONICET), Argentina
| | - Lumi Mema
- Department of Biodiversity Earth and Environmental Sciences and Academy of Natural Sciences, Drexel University, Philadephia, PA, USA
| | - Ko Mochizuki
- Center for Ecological Research, Kyoto University, Hirano, Otsu, Shiga, Japan
| | - Leonor Patrícia Cerdeira Morellato
- Universidade Estadual Paulista UNESP, Instituto de Biociências, Departamento de Botânica, Laboratório de Fenologia, Rio Claro, SP, Brazil
| | | | - Evalyne W Muiruri
- School of Biological Sciences, Royal Holloway University of London, Egham, Surrey, UK
| | - Naoyuki Nakahama
- Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan
| | | | | | | | - Craig I Peter
- Department of Botany, Rhodes University, Grahamstown, South Africa
| | - Sachin Punekar
- Biospheres, Eshwari, Nanasaheb Peshva Marg, Near Ramna Ganpati, Lakshminagar, Parvati, Pune, Maharashtra, India
| | - Nicole Rafferty
- Department of Evolution, Ecology, and Organismal Biology, University of California, Riverside, CA, USA
| | - Alessandro Rapini
- Departamento de Biologia, Universidade Estadual de Feira de Santana, Novo Horizonte, Feira de Santana, Bahia, Brazil
| | - Zong-Xin Ren
- Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, PR China
| | - Claudia I Rodríguez-Flores
- Laboratorio de Ecología, UBIPRO, FES-Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla de Baz, Estado de México, México
| | - Liliana Rosero
- Escuela de Ciencias Biológicas, Universidad Pedagógica y Tecnológica de Colombia, Tunja, Colombia
| | - Shoko Sakai
- Center for Ecological Research, Kyoto University, Hirano, Otsu, Shiga, Japan
| | - Marlies Sazima
- Departamento de Biologia Vegetal, Instituto de Biologia, Caixa, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil
| | - Sandy-Lynn Steenhuisen
- Department of Plant Sciences, Natural and Agricultural Sciences, University of the Free State, Qwaqwa campus, Phuthaditjhaba, Republic of South Africa
| | | | - Carolina Torres
- Facultad de Ciencias Exactas, Fisicas y Naturales, Universidad Nacional de Córdoba (UNC) and IMBIV (CONICET-UNC). CP, Córdoba, Argentina
| | - Kristian Trøjelsgaard
- Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej, Aalborg, Denmark
| | - Atushi Ushimaru
- Graduate School of Human Development and Environment, Kobe University, Tsurukabuto, Kobe City, Japan
| | - Milene Faria Vieira
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa (UFV), Viçosa, Minas Gerais, Brazil
| | - Ana Pía Wiemer
- Museo Botánico Córdoba y Cátedra de Morfología Vegetal (IMBIV-UNC-CONICET), Córdoba, Argentina
| | - Tadashi Yamashiro
- Graduate School of Technology, Industrial and Social Science, Tokushima University, Minamijyosanjima, Tokushima, Japan
| | - Tarcila Nadia
- Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - Joel Queiroz
- Departamento de Educação, Universidade Federal da Paraiba, Mamnguape, Paraiba, Brazil
| | - Zelma Quirino
- Departamento de Engenharia e Meio Ambiente, Universidade Federal da Paraiba, Rio Tinto, Paraíba, Brazil
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Kay KM, Zepeda AM, Raguso RA. Experimental sympatry reveals geographic variation in floral isolation by hawkmoths. ANNALS OF BOTANY 2019; 123:405-413. [PMID: 30032166 PMCID: PMC6344223 DOI: 10.1093/aob/mcy143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 07/06/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND AND AIMS Under a widely accepted model of pollinator-driven speciation, geographic variation in pollinator assemblage drives floral divergence and automatically causes reproductive isolation. Yet it is unclear whether divergent floral adaptation initially confers strong reproductive isolation, or whether that comes at later stages of speciation and requires other forms of reproductive isolation. This study uses a pair of recently diverged, interfertile and parapatric species in the genus Clarkia to determine whether adaptation to hawkmoths, a novel pollinator functional group, would automatically confer floral isolation upon sympatric contact. METHODS First, genetically based differences in floral traits between C. breweri and C. concinna that would be maintained upon migration are quantified. Then scenarios of experimental sympatry are constructed in which arrays of flowers are exposed to the novel pollinator, the hawkmoth Hyles lineata, and pollinator preference and heterospecific pollen transfer are assessed. Source populations from across the ranges of each species are used to understand how geographic variation in floral traits within species may affect floral isolation. KEY RESULTS Although H. lineata has never been observed visiting C. concinna in the wild, it regularly moves between species in experimental floral arrays. Hawkmoth preference and heterospecific pollen transfer vary both among moths and among geographic source locations of C. concinna. The strength of floral isolation in this system is related to variation in flower size, especially hypanthium tube width, and nectar reward among C. concinna forms. CONCLUSIONS Although C. breweri has adopted a novel hawkmoth pollination system, both ethological and mechanical floral isolation by hawkmoths are incomplete and vary according to the specific phenotype of the C. concinna source population. The results suggest that strong floral isolation is not automatically conferred by a pollinator shift and may require additional evolution of deterrent floral traits and habitat isolation that reduces the immediate spatial co-occurrence of young species.
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Affiliation(s)
- Kathleen M Kay
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, CA, USA
| | - Aubrey M Zepeda
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, Santa Cruz, CA, USA
| | - Robert A Raguso
- Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, USA
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Zych M, Junker RR, Nepi M, Stpiczyńska M, Stolarska B, Roguz K. Spatiotemporal variation in the pollination systems of a supergeneralist plant: is Angelica sylvestris (Apiaceae) locally adapted to its most effective pollinators? ANNALS OF BOTANY 2019; 123:415-428. [PMID: 30059963 PMCID: PMC6344219 DOI: 10.1093/aob/mcy140] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 06/28/2018] [Indexed: 05/20/2023]
Abstract
BACKGROUND AND AIMS In terms of pollination systems, umbellifers (plants of the carrot family, Apiaceae) are regarded as generalists, since their (usually dichogamous) flowers are visited by a wide range of insects representing several taxonomic orders. However, recent analyses of insect effectiveness revealed that these plants may be pollinated effectively by a narrow assemblage of insect visitors. Of particular interest was whether populations of an umbellifer species varied in pollinator assemblages and whether this could lead to local specialization of the pollination system. We also explored whether variation in pollinator assemblages was associated with variation in floral traits, and whether this variation influences reproductive output. METHODS The focus was on Angelica sylvestris, a common European species visited by a taxonomically diverse insect assemblage. In three populations, located along an ~700-km transect, over three growth seasons insect visitors were identified, their effectiveness was assessed by surveying pollen loads present on the insect body, insect activity on umbels, nectar and scent composition was studied, and transplantation experiments were performed. KEY RESULTS The populations investigated in this study differed in their nectar and scent profiles and, despite the similar taxonomic composition of insect visitor assemblages, were effectively pollinated by disparate pollinator morphogroups, i.e. flies and beetles. Although this suggested local adaptations to the most effective pollinators, analyses of body pollen loads and behaviour on umbels demonstrated functional equivalency of the visitor morphogroups, which is probably related to the fact that A. sylvestris bears few ovules per flower. The transplantation experiments confirmed that reproductive success was not related to the source of experimental plants and that the insects do not exhibit preferences towards local genotypes. CONCLUSIONS Angelica sylvestris is morphologically well adapted to ecological generalization, and there is little evidence that the surveyed populations represent distinct pollination ecotypes. Most likely, the observed variation in floral characters can be interpreted as 'adaptive wandering'. Specialization in this family seems possible only under very special circumstances, for example when the pollinator community comprises insect visitor groups that clearly differ in their pollination capacity (e.g. due to differences in their functional morphology) and/or have different perceptional biases (e.g. for colour or scent). However, the barrier to the evolution of morphological adaptations resulting in the fine-tuning of the flower towards particular pollinator types may arise from the architectural constraints on the floral bauplan that make umbellifers so uniform in their floral displays and so successful in attracting large numbers of pollinators.
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Affiliation(s)
- Marcin Zych
- Botanic Garden, Faculty of Biology, University of Warsaw, Aleje Ujazdowskie, Warszawa, Poland
- For correspondence. E-mail
| | - Robert R Junker
- Department of Biosciences, University of Salzburg, Salzburg, Austria
| | - Massimo Nepi
- Department of Life Sciences, University of Siena, via Mattioli, Siena, Italy
| | - Małgorzata Stpiczyńska
- Botanic Garden, Faculty of Biology, University of Warsaw, Aleje Ujazdowskie, Warszawa, Poland
| | - Barbara Stolarska
- Botanic Garden, Faculty of Biology, University of Warsaw, Aleje Ujazdowskie, Warszawa, Poland
| | - Katarzyna Roguz
- Botanic Garden, Faculty of Biology, University of Warsaw, Aleje Ujazdowskie, Warszawa, Poland
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Abdelaziz M, Bakkali M, Gómez JM, Olivieri E, Perfectti F. Anther Rubbing, a New Mechanism That Actively Promotes Selfing in Plants. Am Nat 2019; 193:140-147. [PMID: 30624113 DOI: 10.1086/700875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Self-fertilization has recurrently evolved in plants, involving different strategies and traits and often loss of attractive functions, collectively known as the selfing syndrome. However, few traits that actively promote self-fertilization have been described. Here we describe a novel mechanism promoting self-fertilization in the Brassicaceae species Erysimum incanum. This mechanism, which we called "anther rubbing," consists of autonomous, repeated, and coordinated movements of the stamens over the stigma during flower opening. We have documented anther rubbing by time-lapse videos and experimentally show that it causes self-pollen deposition on stigmas and is sufficient to achieve maximal reproductive output in E. incanum. We predict that these movements should occur in species with limited inbreeding depression, and indeed we find that inbreeding depression in seed production is negligible in this species. While many studies have documented complex floral traits that promote outcrossing, the occurrence of anther rubbing demonstrates that plants can evolve elaborate and underappreciated adaptations to promote self-fertilization.
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Opedal ØH. The evolvability of animal-pollinated flowers: towards predicting adaptation to novel pollinator communities. THE NEW PHYTOLOGIST 2019; 221:1128-1135. [PMID: 30145801 DOI: 10.1111/nph.15403] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 07/23/2018] [Indexed: 06/08/2023]
Abstract
In the event of a community turnover, population decline, or complete disappearance of pollinators, animal-pollinated plants may respond by adapting to novel pollinators or by changing their mating system. The ability of populations to adapt is determined by their ability to respond to novel selection pressures, i.e. their evolvability. In the short term, evolvability is determined by standing genetic variation in the trait under selection. To evaluate the evolutionary potential of plant reproductive systems, I compiled genetic-variance estimates for a large selection of floral traits mediating shifts in pollination and mating systems. Then, I computed evolvabilities and compared these among trait groups and against the evolvabilities of vegetative traits. Evolvabilities of most floral traits were substantial yet tended to be lower than the median for vegetative traits. Among floral traits, herkogamy (anther-stigma distance), floral-display traits and perhaps floral-volatile concentrations had greater-than-average evolvabilities, while the evolvabilities of pollinator-fit traits were below average. These results suggest that most floral traits have the potential to evolve rapidly in response to novel selection pressures, providing resilience of plant reproductive systems in the event of changing pollinator communities.
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Affiliation(s)
- Øystein H Opedal
- Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology, NTNU, Trondheim, 7491, Norway
- Research Centre for Ecological Change, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
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Timerman D, Barrett SCH. Divergent selection on the biomechanical properties of stamens under wind and insect pollination. Proc Biol Sci 2018; 285:20182251. [PMID: 30963912 PMCID: PMC6304045 DOI: 10.1098/rspb.2018.2251] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 11/20/2018] [Indexed: 11/12/2022] Open
Abstract
Wind pollination has evolved from insect pollination in numerous angiosperm lineages and is associated with a characteristic syndrome of morphological traits. The traits initiating transitions to wind pollination and the ecological drivers involved are poorly understood. Here, we examine this problem in Thalictrum pubescens, an ambophilous (insect and wind pollination) species that probably represents a transitional state in the evolution of wind pollination. We investigated wind-induced pollen release by forced harmonic motion by measuring stamen natural frequency ( fn), a key vibration parameter, and its variability among nine populations. We assessed the repeatability of fn over consecutive growing seasons, the effect of this parameter on pollen release in a wind tunnel, and male reproductive success in the field using experimental manipulation of the presence or absence of pollinators. We found significant differences among populations and high repeatability within genotypes in fn. The wind tunnel assay revealed a strong negative correlation between fn and pollen release. Siring success was greatest for plants with lower fn when pollinators were absent, but this advantage diminished when pollinators were present. Our biomechanical analysis of the wind-flower interface has identified fn as a key trait for understanding early stages in the transition from insect to wind pollination.
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Affiliation(s)
- David Timerman
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario, CanadaM5S 3B2
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Glasnović P, Temunović M, Lakušić D, Rakić T, Grubar VB, Surina B. Understanding biogeographical patterns in the western Balkan Peninsula using environmental niche modelling and geostatistics in polymorphic Edraianthus tenuifolius. AOB PLANTS 2018; 10:ply064. [PMID: 30425822 PMCID: PMC6220721 DOI: 10.1093/aobpla/ply064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 10/09/2018] [Indexed: 06/09/2023]
Abstract
The Balkan Peninsula represents one of the three southern European glacial refugia where biodiversity persisted throughout the climatically unstable Quaternary. This study considered the 'refugia within refugia' model, which assumes the environmental heterogeneity over time and space in larger refugia. To better understand patterns shaped during the Quaternary climatic oscillations, the present and last glacial maximum (LGM) environmental conditions and current morphological variability of Edraianthus tenuifolius, an endemic plant of the western Balkans with a well-known therphical structure, were considered. Potential present and LGM distributions were studied through environmental niche modelling using 161 data of occurrences and six bioclimatic variables, hindcasting the model to LGM conditions using three different global circulation models. To test the geographical variability of the reproductive region, 41 characters of 667 inflorescences from 35 populations within the distribution range were measured. Geographical patterns, using geostatistics together with univariate and multivariate statistical approaches, were analysed. The environmental niche model suggested the current potential distribution in correspondence to its known occurrences. The hindcast to LGM conditions suggested two separate areas of environmental suitability, one in the present-day northern Adriatic coast of Croatia (Istrian Peninsula, Kvarner) and another on the present-day south-eastern Adriatic coast (southern Dalmatia, Montenegro and northern Albania). Morphological variability showed a similar pattern, where southern populations separated from northern populations according to a major split in the central part of its distribution range (central Dalmatia). On other levels, stronger barriers were predicted to separate northern populations from the eastern Istrian Peninsula and the Kvarner area. The results suggested congruent biogeographical patterns to the already known phylogeographical structure. Both environmental niche modelling and the geographical variability of morphological characters suggested spatial partitioning, indicating the potential presence of two separate refugia during the LGM.
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Affiliation(s)
- Peter Glasnović
- Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška, Koper, Slovenia
| | - Martina Temunović
- Faculty of Forestry, Department of Forest Genetics, Dendrology and Botany, University of Zagreb, Svetošimunska, Zagreb, Croatia
| | - Dmitar Lakušić
- Faculty of Biology, Institute of Botany and Botanical Garden ‘Jevremovac’, University of Belgrade, Takovska, Belgrade, Serbia
| | - Tamara Rakić
- Faculty of Biology, Institute of Botany and Botanical Garden ‘Jevremovac’, University of Belgrade, Takovska, Belgrade, Serbia
| | | | - Boštjan Surina
- Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška, Koper, Slovenia
- Natural History Museum Rijeka, Lorenzov Prolaz, Rijeka, Croatia
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127
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Nakahira M, Ono H, Wee SL, Tan KH, Nishida R. Floral synomone diversification of Bulbophyllum sibling species (Orchidaceae) in attracting fruit fly pollinators. BIOCHEM SYST ECOL 2018. [DOI: 10.1016/j.bse.2018.10.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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129
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Givnish TJ, Zuluaga A, Spalink D, Soto Gomez M, Lam VKY, Saarela JM, Sass C, Iles WJD, de Sousa DJL, Leebens-Mack J, Chris Pires J, Zomlefer WB, Gandolfo MA, Davis JI, Stevenson DW, dePamphilis C, Specht CD, Graham SW, Barrett CF, Ané C. Monocot plastid phylogenomics, timeline, net rates of species diversification, the power of multi-gene analyses, and a functional model for the origin of monocots. AMERICAN JOURNAL OF BOTANY 2018; 105:1888-1910. [PMID: 30368769 DOI: 10.1002/ajb2.1178] [Citation(s) in RCA: 112] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 08/03/2018] [Indexed: 05/03/2023]
Abstract
PREMISE OF THE STUDY We present the first plastome phylogeny encompassing all 77 monocot families, estimate branch support, and infer monocot-wide divergence times and rates of species diversification. METHODS We conducted maximum likelihood analyses of phylogeny and BAMM studies of diversification rates based on 77 plastid genes across 545 monocots and 22 outgroups. We quantified how branch support and ascertainment vary with gene number, branch length, and branch depth. KEY RESULTS Phylogenomic analyses shift the placement of 16 families in relation to earlier studies based on four plastid genes, add seven families, date the divergence between monocots and eudicots+Ceratophyllum at 136 Mya, successfully place all mycoheterotrophic taxa examined, and support recognizing Taccaceae and Thismiaceae as separate families and Arecales and Dasypogonales as separate orders. Only 45% of interfamilial divergences occurred after the Cretaceous. Net species diversification underwent four large-scale accelerations in PACMAD-BOP Poaceae, Asparagales sister to Doryanthaceae, Orchidoideae-Epidendroideae, and Araceae sister to Lemnoideae, each associated with specific ecological/morphological shifts. Branch ascertainment and support across monocots increase with gene number and branch length, and decrease with relative branch depth. Analysis of entire plastomes in Zingiberales quantifies the importance of non-coding regions in identifying and supporting short, deep branches. CONCLUSIONS We provide the first resolved, well-supported monocot phylogeny and timeline spanning all families, and quantify the significant contribution of plastome-scale data to resolving short, deep branches. We outline a new functional model for the evolution of monocots and their diagnostic morphological traits from submersed aquatic ancestors, supported by convergent evolution of many of these traits in aquatic Hydatellaceae (Nymphaeales).
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Affiliation(s)
- Thomas J Givnish
- Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
| | | | - Daniel Spalink
- Department of Ecosystem Science, Texas A&M University, College Station, Texas, 77840, USA
| | - Marybel Soto Gomez
- Department of Botany, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada
| | - Vivienne K Y Lam
- Department of Botany, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada
| | | | - Chodon Sass
- The University and Jepson Herbarium, University of California-Berkeley, Berkeley, California, 94720, USA
| | - William J D Iles
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Danilo José Lima de Sousa
- Departamento de Ciéncias Biológicas, Universidade Estadual de Feira de Santana, Feira de Santana, Bahia, 44036-900, Brazil
| | - James Leebens-Mack
- Department of Plant Biology, University of Georgia, Athens, Georgia, 30602, USA
| | - J Chris Pires
- Division of Biological Sciences, University of Missouri-Columbia, Columbia, Missouri, 65211, USA
| | - Wendy B Zomlefer
- Department of Plant Biology, University of Georgia, Athens, Georgia, 30602, USA
| | - Maria A Gandolfo
- School of Integrative Plant Sciences and L.H. Bailey Hortorium, Cornell University, Ithaca, New York, 14853, USA
| | - Jerrold I Davis
- School of Integrative Plant Sciences and L.H. Bailey Hortorium, Cornell University, Ithaca, New York, 14853, USA
| | | | - Claude dePamphilis
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Chelsea D Specht
- School of Integrative Plant Sciences and L.H. Bailey Hortorium, Cornell University, Ithaca, New York, 14853, USA
| | - Sean W Graham
- Department of Botany, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada
| | - Craig F Barrett
- Department of Biology, West Virginia University, Morgantown, West Virginia, 26506, USA
| | - Cécile Ané
- Department of Botany, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
- Department of Statistics, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA
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Wu Y, Zhong T, Liu GL, Tan LW, Li QJ. The relative strength of different floral visitors driving floral evolution within a Primula secundiflora population. Evol Ecol 2018. [DOI: 10.1007/s10682-018-9962-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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131
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Schiestl FP, Balmer A, Gervasi DD. Real‐time evolution supports a unique trajectory for generalized pollination*. Evolution 2018; 72:2653-2668. [DOI: 10.1111/evo.13611] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 08/13/2018] [Accepted: 09/05/2018] [Indexed: 01/18/2023]
Affiliation(s)
- Florian P. Schiestl
- Institute of Systematic and Evolutionary BotanyUniversity of Zürich Zollikerstrasse 107, CH‐8008 Zürich Switzerland
| | - Alice Balmer
- Institute of Systematic and Evolutionary BotanyUniversity of Zürich Zollikerstrasse 107, CH‐8008 Zürich Switzerland
| | - Daniel D. Gervasi
- Institute of Systematic and Evolutionary BotanyUniversity of Zürich Zollikerstrasse 107, CH‐8008 Zürich Switzerland
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132
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Rodrigues DM, Caballero-Villalobos L, Turchetto C, Assis Jacques R, Kuhlemeier C, Freitas LB. Do we truly understand pollination syndromes in Petunia as much as we suppose? AOB PLANTS 2018; 10:ply057. [PMID: 30386543 PMCID: PMC6202611 DOI: 10.1093/aobpla/ply057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 09/27/2018] [Indexed: 05/29/2023]
Abstract
Petunia is endemic to South America grasslands; member of this genus exhibit variation in flower colour and shape, attracting bees, hawkmoths or hummingbirds. This group of plants is thus an excellent model system for evolutionary studies of diversification associated with pollinator shifts. Our aims were to identify the legitimate pollinator of Petunia secreta, a rare and endemic species, and to assess the importance of floral traits in pollinator attraction in this Petunia species. To determine the legitimate pollinator, field observations were conducted, and all floral visitors were recorded and evaluated. We also measured the nectar volume and sugar concentration. To characterize morphological cues for pollinators, we assessed the ultraviolet (UV)-light response in detached flowers, and characterized the floral pigments and pollen volatile scents for four different Petunia species that present different pollination syndromes. Petunia secreta shares the most recent ancestor with a white hawkmoth-pollinated species, P. axillaris, but presents flavonols and anthocyanin pigments responsible for the pink corolla colour and UV-light responses that are common to bee-pollinated Petunia species. Our study showed that a solitary bee in the genus Pseudagapostemon was the most frequent pollinator of P. secreta, and these bees collect only pollen as a reward. Despite being mainly bee-pollinated, different functional groups of pollinators visit P. secreta. Nectar volume, sugar concentration per flower, morphology and components of pollen scent would appear to be attractive to several different pollinator groups. Notably, the corolla includes a narrow tube with nectar at its base that cannot be reached by Pseudagapostemon, and flowers of P. secreta appear to follow an evolutionary transition, with traits attractive to several functional groups of pollinators. Additionally, the present study shows that differences in the volatiles of pollen scent are relevant for plant mutualistic and antagonist interactions in Petunia species and that pollen scent profile plays a key role in characterizing pollination syndromes.
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Affiliation(s)
- Daniele M Rodrigues
- Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Lina Caballero-Villalobos
- Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Caroline Turchetto
- Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Rosangela Assis Jacques
- Department of Inorganic Chemistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Cris Kuhlemeier
- Institute of Plant Sciences, Altenbergrain, Bern, Switzerland
| | - Loreta B Freitas
- Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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133
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Wu Y, Zhong T, Zhang ZQ, Li QJ. Pollinator-mediated selection on floral traits varies in space and between morphs in Primula secundiflora. AOB PLANTS 2018; 10:ply059. [PMID: 30393517 PMCID: PMC6205359 DOI: 10.1093/aobpla/ply059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 09/28/2018] [Indexed: 06/08/2023]
Abstract
Elucidating how variation in selection shapes the evolution of flowers is key to understanding adaptive differentiation processes. We estimated pollinator-mediated selection through female function in L-morph (long-style and short-anther phenotype) and S-morph (short-style and long-anther phenotype) flowers among four Primula secundiflora populations with different pollinator assemblages. Variation in pollinator assemblage strongly contributed to differences in reproductive success among populations and between morphs of the primrose species. A wider corolla tube width was selected in the bumblebee-dominated populations, whereas shorter corolla tube length and wider corolla tube width were selected in the syrphid fly-dominated populations. Morph-specific variation in pollinator-mediated selection on corolla tube length was detected in the syrphid fly-dominated populations. A shorter corolla tube was selected in the L-morph flowers. However, similar selective pressure on this trait was not observed in the S-morph flowers. These results show that variation in pollinator assemblage leads to variation in selection in space and between morphs. The findings highlight the potential forces of different pollinator agents in driving floral evolution in this primrose species.
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Affiliation(s)
- Yun Wu
- School of Civil Engineering, Architecture and Environment, Xihua University, Chengdu, China
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Tao Zhong
- College of Landscape Architecture, Sichuan Agricultural University, Chengdu, China
| | - Zhi-Qiang Zhang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Laboratory of Ecology and Evolutionary Biology, Yunnan University, Kunming, China
| | - Qing-Jun Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Laboratory of Ecology and Evolutionary Biology, Yunnan University, Kunming, China
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Fonseca LHM, Lohmann LG. Combining high-throughput sequencing and targeted loci data to infer the phylogeny of the “Adenocalymma-Neojobertia” clade (Bignonieae, Bignoniaceae). Mol Phylogenet Evol 2018; 123:1-15. [DOI: 10.1016/j.ympev.2018.01.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 01/25/2018] [Accepted: 01/31/2018] [Indexed: 10/18/2022]
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135
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Ronse De Craene L. Understanding the role of floral development in the evolution of angiosperm flowers: clarifications from a historical and physico-dynamic perspective. JOURNAL OF PLANT RESEARCH 2018; 131:367-393. [PMID: 29589194 DOI: 10.1007/s10265-018-1021-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/14/2018] [Indexed: 05/26/2023]
Abstract
Flower morphology results from the interaction of an established genetic program, the influence of external forces induced by pollination systems, and physical forces acting before, during and after initiation. Floral ontogeny, as the process of development from a meristem to a fully developed flower, can be approached either from a historical perspective, as a "recapitulation of the phylogeny" mainly explained as a process of genetic mutations through time, or from a physico-dynamic perspective, where time, spatial pressures, and growth processes are determining factors in creating the floral morphospace. The first (historical) perspective clarifies how flower morphology is the result of development over time, where evolutionary changes are only possible using building blocks that are available at a certain stage in the developmental history. Flowers are regulated by genetically determined constraints and development clarifies specific transitions between different floral morphs. These constraints are the result of inherent mutations or are induced by the interaction of flowers with pollinators. The second (physico-dynamic) perspective explains how changes in the physical environment of apical meristems create shifts in ontogeny and this is reflected in the morphospace of flowers. Changes in morphology are mainly induced by shifts in space, caused by the time of initiation (heterochrony), pressure of organs, and alterations of the size of the floral meristem, and these operate independently or in parallel with genetic factors. A number of examples demonstrate this interaction and its importance in the establishment of different floral forms. Both perspectives are complementary and should be considered in the understanding of factors regulating floral development. It is suggested that floral evolution is the result of alternating bursts of physical constraints and genetic stabilization processes following each other in succession. Future research needs to combine these different perspectives in understanding the evolution of floral systems and their diversification.
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136
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Suinyuy TN, Johnson SD. Geographic variation in cone volatiles and pollinators in the thermogenic African cycad Encephalartos ghellinckii Lem. PLANT BIOLOGY (STUTTGART, GERMANY) 2018; 20:579-590. [PMID: 29281847 DOI: 10.1111/plb.12685] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 12/19/2017] [Indexed: 06/07/2023]
Abstract
Heat and odour production can have profound effects on pollination in cycads. It is therefore expected that these traits would co-vary geographically with pollinator assemblages. Such intraspecific variation, may lead to the evolution of pollination ecotypes, which can be an early stage of pollinator-mediated speciation. We measured cone temperatures using miniature temperature data loggers and examined the composition of cone volatile odours using headspace sampling and analysis with gas chromatography-mass spectrometry in four populations spanning the range of the African cycad Encephalartos ghellinckii. Pollinator assemblages were also investigated in three populations. Male and female cones were thermogenic at pollen shed and receptive stages, respectively, but patterns of thermogenesis did not vary among populations. Scent emissions from cones in populations in the Drakensberg Mountains were characterised by cis-β-ocimene, β-myrcene and (3E)-1,3-octadiene, while camphene and α-pinene were characteristic of scent emissions from cones in populations closer to the coast. These differences in volatile blends corresponded with differences in insect assemblages. These results confirm intraspecific variation in volatile emissions of E. ghellinckii and support the predictions that intraspecific variation in volatile emissions will be associated with shifts in pollinator assemblages. While further work needs to be done to test for local adaptation in this system, this preliminary evidence is consistent with the formation of pollination ecotypes in the E. ghellinckii species complex.
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Affiliation(s)
- T N Suinyuy
- School of Life Sciences, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South Africa
| | - S D Johnson
- School of Life Sciences, University of KwaZulu-Natal, Scottsville, Pietermaritzburg, South Africa
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137
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Tsai T, Diggle PK, Frye HA, Jones CS. Contrasting lengths of Pelargonium floral nectar tubes result from late differences in rate and duration of growth. ANNALS OF BOTANY 2018; 121:549-560. [PMID: 29293992 PMCID: PMC5838813 DOI: 10.1093/aob/mcx171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Accepted: 11/09/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND AND AIMS Much of morphological evolution in flowers has arisen from pollinator-mediated selection, often manifest as a match between the length of the pollinator's proboscis and the depth of tubular corollas or spurs. We investigate development, growth and homology of the unique nectar tube of Pelargonium, frequently described as 'a spur adnate to the pedicel'. METHODS We focused on two species. The nectar tube of P. ionidiflorum is three times longer than that of P. odoratissimum. Light and scanning electron microscopy were carried out, and daily growth measurements were used to compare nectar tube development and vascular patterns. KEY RESULTS Nectar tubes in both species are initiated centripetally to the dorsal sepal in a space created by lateral displacement of two antepetalous stamens. The cavity deepens through subsequent intercalary growth of the receptacle that proceeds at the same rate in both species until tubes reach approx. 10 mm in length. Differences in final nectar tube lengths arise via an increase in the rate and duration of growth of the receptacle that begins just before anthesis (floral opening) and continues for several days past anthesis in P. ionidiflorum but does not occur in P. odoratissimum. Epidermal cells of the dorsal surface of the nectar tube in P. ionidiflorum are approx. 1.6 times longer than those in P. odoratissimum. Histological sections show no evidence that the nectar tube is a spur that became evolutionarily fused to the pedicel. CONCLUSIONS Nectar tubes in Pelargonium are localized cavities that form in the receptacle via intercalary growth. Differences in the rate and duration of growth just prior to and following anthesis underlie differences in final tube lengths. Because differences in cell lengths do not fully account for differences in nectar tube lengths, evolutionary diversification must involve changes in both cell cycle and cell expansion.
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Affiliation(s)
- Timothy Tsai
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
| | - Pamela K Diggle
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
| | - Henry A Frye
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
| | - Cynthia S Jones
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, USA
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Serrano-Serrano ML, Rolland J, Clark JL, Salamin N, Perret M. Hummingbird pollination and the diversification of angiosperms: an old and successful association in Gesneriaceae. Proc Biol Sci 2018; 284:rspb.2016.2816. [PMID: 28381621 DOI: 10.1098/rspb.2016.2816] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 03/07/2017] [Indexed: 11/12/2022] Open
Abstract
The effects of specific functional groups of pollinators in the diversification of angiosperms are still to be elucidated. We investigated whether the pollination shifts or the specific association with hummingbirds affected the diversification of a highly diverse angiosperm lineage in the Neotropics. We reconstructed a phylogeny of 583 species from the Gesneriaceae family and detected diversification shifts through time, inferred the timing and amount of transitions among pollinator functional groups, and tested the association between hummingbird pollination and speciation and extinction rates. We identified a high frequency of pollinator transitions, including reversals to insect pollination. Diversification rates of the group increased through time since 25 Ma, coinciding with the evolution of hummingbird-adapted flowers and the arrival of hummingbirds in South America. We showed that plants pollinated by hummingbirds have a twofold higher speciation rate compared with plants pollinated by insects, and that transitions among functional groups of pollinators had little impact on the diversification process. We demonstrated that floral specialization on hummingbirds for pollination has triggered rapid diversification in the Gesneriaceae family since the Early Miocene, and that it represents one of the oldest identified plant-hummingbird associations. Biotic drivers of plant diversification in the Neotropics could be more related to this specific type of pollinator (hummingbirds) than to shifts among different functional groups of pollinators.
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Affiliation(s)
- Martha Liliana Serrano-Serrano
- Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland.,Swiss Institute of Bioinformatics, Quartier Sorge, 1015 Lausanne, Switzerland
| | - Jonathan Rolland
- Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland.,Swiss Institute of Bioinformatics, Quartier Sorge, 1015 Lausanne, Switzerland
| | - John L Clark
- Department of Biological Sciences, The University of Alabama, PO Box 870345, Tuscaloosa, AL 35487-0345, USA
| | - Nicolas Salamin
- Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland.,Swiss Institute of Bioinformatics, Quartier Sorge, 1015 Lausanne, Switzerland
| | - Mathieu Perret
- Conservatoire et Jardin botaniques de la Ville de Genève and Laboratory of Plant Systematics and Biodiversity, University of Geneva, Chemin de l'Impératrice 1, 1292 Chambésy, Geneva, Switzerland
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139
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Smith SD, Kriebel R. Convergent evolution of floral shape tied to pollinator shifts in Iochrominae (Solanaceae)*. Evolution 2018; 72:688-697. [DOI: 10.1111/evo.13416] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 12/01/2017] [Accepted: 12/08/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Stacey D. Smith
- Department of Ecology and Evolutionary Biology University of Colorado Boulder Colorado 80305
| | - Ricardo Kriebel
- Department of Botany University of Wisconsin – Madison Madison Wisconsin 53706
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140
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Duffy KJ, Johnson SD. Specialized mutualisms may constrain the geographical distribution of flowering plants. Proc Biol Sci 2017; 284:20171841. [PMID: 29093225 PMCID: PMC5698652 DOI: 10.1098/rspb.2017.1841] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 10/05/2017] [Indexed: 11/12/2022] Open
Abstract
It is commonly assumed that the geographical distributions of plants are governed mainly by abiotic variables. However, interactions with other organisms, such as pollinators, also have the potential to influence plant distributions. To investigate this, we developed niche models for 32 plant taxa that have specialized pollination systems and which are native to a biodiversity hotspot (South Africa). We found that the distributions of these taxa are best explained by a combination of biotic (pollinators) and abiotic factors, rather than by abiotic factors alone. For approximately 66% of these plant taxa, pollinator distributions were the factor that provided the best predictor of their niches. Furthermore, co-occurrence of these plants and their pollinators was generally not explained solely by shared abiotic niches, and thus probably reflects broad-scale positive ecological interactions. These results are consistent with the proposal that pollinator distributions may constrain plant distributions and highlight the general potential for species distributions to be shaped by positive interactions with other species. This has important consequences for predicting how distributions of species might change in the face of loss of their key mutualists.
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Affiliation(s)
- Karl J Duffy
- School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa
| | - Steven D Johnson
- School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa
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141
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Heslop-Harrison JS(P. Morphology, adaptation and speciation. ANNALS OF BOTANY 2017; 120:621-624. [PMCID: PMC5691378 DOI: 10.1093/aob/mcx130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 10/17/2017] [Indexed: 06/15/2023]
Abstract
The study of plant evolution and development in a phylogenetic context has accelerated research advances in both areas over the last decade. The addition of a robust phylogeny for plant taxa based on DNA as well as morphology has given a strong context for this research. Genetics and genomics, including sequencing of many genes, and a better understanding of non-genetic, responsive changes, by plants have increased knowledge of how the different body forms of plants have arisen. Here, I overview the papers in this Special Issue of Annals of Botany on Morphological Adaptation, bringing together a range of papers that link phylogeny and morphology. These lead to models of development and functional adaptation across a range of plant systems, with implications for ecology and ecosystems, as well as development and evolution.
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142
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Deschepper P, Brys R, Fortuna MA, Jacquemyn H. Analysis of spatial genetic variation reveals genetic divergence among populations of Primula veris associated to contrasting habitats. Sci Rep 2017; 7:8847. [PMID: 28821787 PMCID: PMC5562905 DOI: 10.1038/s41598-017-09154-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 07/24/2017] [Indexed: 12/01/2022] Open
Abstract
Genetic divergence by environment is a process whereby selection causes the formation of gene flow barriers between populations adapting to contrasting environments and is often considered to be the onset of speciation. Nevertheless, the extent to which genetic differentiation by environment on small spatial scales can be detected by means of neutral markers is still subject to debate. Previous research on the perennial herb Primula veris has shown that plants from grassland and forest habitats showed pronounced differences in phenology and flower morphology, suggesting limited gene flow between habitats. To test this hypothesis, we sampled 33 populations of P. veris consisting of forest and grassland patches and used clustering techniques and network analyses to identify sets of populations that are more connected to each other than to other sets of populations and estimated the timing of divergence. Our results showed that spatial genetic variation had a significantly modular structure and consisted of four well-defined modules that almost perfectly coincided with habitat features. Genetic divergence was estimated to have occurred about 114 generations ago, coinciding with historic major changes in the landscape. Overall, these results illustrate how populations adapting to different environments become structured genetically within landscapes on small spatial scales.
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Affiliation(s)
- Pablo Deschepper
- Division of Plant Ecology and Systematics, Biology Department, University of Leuven, Leuven, Belgium.
| | - Rein Brys
- Research Institute for Forest and Nature, Gaverstraat 4, B-9500, Geraardsbergen, Belgium
| | - Miguel A Fortuna
- Department of Evolutionary Biology and Environmental Studies. University of Zurich, Zurich, Switzerland
| | - Hans Jacquemyn
- Division of Plant Ecology and Systematics, Biology Department, University of Leuven, Leuven, Belgium
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143
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Alix K, Gérard PR, Schwarzacher T, Heslop-Harrison JS(P. Polyploidy and interspecific hybridization: partners for adaptation, speciation and evolution in plants. ANNALS OF BOTANY 2017; 120:183-194. [PMID: 28854567 PMCID: PMC5737848 DOI: 10.1093/aob/mcx079] [Citation(s) in RCA: 173] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Accepted: 05/31/2017] [Indexed: 05/15/2023]
Abstract
BACKGROUND Polyploidy or whole-genome duplication is now recognized as being present in almost all lineages of higher plants, with multiple rounds of polyploidy occurring in most extant species. The ancient evolutionary events have been identified through genome sequence analysis, while recent hybridization events are found in about half of the world's crops and wild species. Building from this new paradigm for understanding plant evolution, the papers in this Special Issue address questions about polyploidy in ecology, adaptation, reproduction and speciation of wild and cultivated plants from diverse ecosystems. Other papers, including this review, consider genomic aspects of polyploidy. APPROACHES Discovery of the evolutionary consequences of new, evolutionarily recent and ancient polyploidy requires a range of approaches. Large-scale studies of both single species and whole ecosystems, with hundreds to tens of thousands of individuals, sometimes involving 'garden' or transplant experiments, are important for studying adaptation. Molecular studies of genomes are needed to measure diversity in genotypes, showing ancestors, the nature and number of polyploidy and backcross events that have occurred, and allowing analysis of gene expression and transposable element activation. Speciation events and the impact of reticulate evolution require comprehensive phylogenetic analyses and can be assisted by resynthesis of hybrids. In this Special Issue, we include studies ranging in scope from experimental and genomic, through ecological to more theoretical. CONCLUSIONS The success of polyploidy, displacing the diploid ancestors of almost all plants, is well illustrated by the huge angiosperm diversity that is assumed to originate from recurrent polyploidization events. Strikingly, polyploidization often occurred prior to or simultaneously with major evolutionary transitions and adaptive radiation of species, supporting the concept that polyploidy plays a predominant role in bursts of adaptive speciation. Polyploidy results in immediate genetic redundancy and represents, with the emergence of new gene functions, an important source of novelty. Along with recombination, gene mutation, transposon activity and chromosomal rearrangement, polyploidy and whole-genome duplication act as drivers of evolution and divergence in plant behaviour and gene function, enabling diversification, speciation and hence plant evolution.
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Affiliation(s)
- Karine Alix
- GQE – Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
- For correspondence. E-mail
| | - Pierre R. Gérard
- GQE – Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Trude Schwarzacher
- Department of Genetics and Genome Biology, University of Leicester, Leicester, UK
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144
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Kahnt B, Montgomery GA, Murray E, Kuhlmann M, Pauw A, Michez D, Paxton RJ, Danforth BN. Playing with extremes: Origins and evolution of exaggerated female forelegs in South African Rediviva bees. Mol Phylogenet Evol 2017; 115:95-105. [PMID: 28757446 DOI: 10.1016/j.ympev.2017.07.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 06/22/2017] [Accepted: 07/26/2017] [Indexed: 10/19/2022]
Abstract
Despite close ecological interactions between plants and their pollinators, only some highly specialised pollinators adapt to a specific host plant trait by evolving a bizarre morphology. Here we investigated the evolution of extremely elongated forelegs in females of the South African bee genus Rediviva (Hymenoptera: Melittidae), in which long forelegs are hypothesised to be an adaptation for collecting oils from the extended spurs of their Diascia host flowers. We first reconstructed the phylogeny of the genus Rediviva using seven genes and inferred an origin of Rediviva at around 29MYA (95% HPD=19.2-40.5), concurrent with the origin and radiation of the Succulent Karoo flora. The common ancestor of Rediviva was inferred to be a short-legged species that did not visit Diascia. Interestingly, all our analyses strongly supported at least two independent origins of long legs within Rediviva. Leg length was not correlated with any variable we tested (ecological specialisation, Diascia visitation, geographic distribution, pilosity type) but seems to have evolved very rapidly. Overall, our results indicate that foreleg length is an evolutionary highly labile, rapidly evolving trait that might enable Rediviva bees to respond quickly to changing floral resource availability.
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Affiliation(s)
- Belinda Kahnt
- Institute of Biology/General Zoology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 8, 06120 Halle (Saale), Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany.
| | - Graham A Montgomery
- Department of Entomology, Cornell University, 3124 Comstock Hall, Ithaca, NY 14853-2601, USA
| | - Elizabeth Murray
- Department of Entomology, Cornell University, 3124 Comstock Hall, Ithaca, NY 14853-2601, USA
| | - Michael Kuhlmann
- Zoological Museum, Kiel University, Hegewischstr. 3, 24105 Kiel, Germany; Dept. of Life Sciences, Natural History Museum, Cromwell Rd., London SW7 5BD, UK
| | - Anton Pauw
- Department of Botany and Zoology, Stellenbosch University, Matieland 7602, South Africa
| | - Denis Michez
- Laboratoire de Zoologie, Research institute of Biosciences, University of Mons, Place du Parc 23, 7000 Mons, Belgium
| | - Robert J Paxton
- Institute of Biology/General Zoology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 8, 06120 Halle (Saale), Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany
| | - Bryan N Danforth
- Department of Entomology, Cornell University, 3124 Comstock Hall, Ithaca, NY 14853-2601, USA
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145
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Gervasi DDL, Selosse MA, Sauve M, Francke W, Vereecken NJ, Cozzolino S, Schiestl FP. Floral scent and species divergence in a pair of sexually deceptive orchids. Ecol Evol 2017; 7:6023-6034. [PMID: 28808562 PMCID: PMC5551101 DOI: 10.1002/ece3.3147] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/14/2017] [Accepted: 05/17/2017] [Indexed: 01/08/2023] Open
Abstract
Speciation is typically accompanied by the formation of isolation barriers between lineages. Commonly, reproductive barriers are separated into pre‐ and post‐zygotic mechanisms that can evolve with different speed. In this study, we measured the strength of different reproductive barriers in two closely related, sympatric orchids of the Ophrys insectifera group, namely Ophrys insectifera and Ophrys aymoninii to infer possible mechanisms of speciation. We quantified pre‐ and post‐pollination barriers through observation of pollen flow, by performing artificial inter‐ and intraspecific crosses and analyzing scent bouquets. Additionally, we investigated differences in mycorrhizal fungi as a potential extrinsic factor of post‐zygotic isolation. Our results show that floral isolation mediated by the attraction of different pollinators acts apparently as the sole reproductive barrier between the two orchid species, with later‐acting intrinsic barriers seemingly absent. Also, the two orchids share most of their fungal mycorrhizal partners in sympatry, suggesting little or no importance of mycorrhizal symbiosis in reproductive isolation. Key traits underlying floral isolation were two alkenes and wax ester, present predominantly in the floral scent of O. aymoninii. These compounds, when applied to flowers of O. insectifera, triggered attraction and a copulation attempt of the bee pollinator of O. aymoninii and thus led to the (partial) breakdown of floral isolation. Based on our results, we suggest that adaptation to different pollinators, mediated by floral scent, underlies species isolation in this plant group. Pollinator switches may be promoted by low pollination success of individuals in dense patches of plants, an assumption that we also confirmed in our study.
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Affiliation(s)
- Daniel D L Gervasi
- Department of Systematic and Evolutionary Botany University of Zürich Zürich Switzerland
| | - Marc-Andre Selosse
- Institut de Systématique, Évolution, Biodiversité (ISYEB)UMR 7205 CNRS MNHN UPMC EPHE Muséum national d'Histoire naturelle Sorbonne Universités Paris France.,Department of Plant Taxonomy and Nature Conservation University of Gdansk Gdańsk Poland
| | - Mathieu Sauve
- Institut de Systématique, Évolution, Biodiversité (ISYEB)UMR 7205 CNRS MNHN UPMC EPHE Muséum national d'Histoire naturelle Sorbonne Universités Paris France
| | - Wittko Francke
- Institute of Organic Chemistry University of Hamburg Hamburg Germany
| | - Nicolas J Vereecken
- Agroecology and Pollination Group Landscape Ecology and Plant Production Systems Université libre de Bruxelles (ULB) Brussels Belgium
| | | | - Florian P Schiestl
- Department of Systematic and Evolutionary Botany University of Zürich Zürich Switzerland
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146
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Marquis RJ, Salazar D, Baer C, Reinhardt J, Priest G, Barnett K. Ode to Ehrlich and Raven or how herbivorous insects might drive plant speciation. Ecology 2017; 97:2939-2951. [PMID: 27870033 DOI: 10.1002/ecy.1534] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 06/27/2016] [Accepted: 07/07/2016] [Indexed: 11/06/2022]
Abstract
Fifty years ago, Ehrlich and Raven proposed that insect herbivores have driven much of plant speciation, particularly at tropical latitudes. There have been no explicit tests of their hypotheses. Indeed there were no proposed mechanisms either at the time or since by which herbivores might generate new plant species. Here we outline two main classes of mechanisms, prezygotic and postzygotic, with a number of scenarios in each by which herbivore-driven changes in host plant secondary chemistry might lead to new plant lineage production. The former apply mainly to a sympatric model of speciation while the latter apply to a parapatric or allopatric model. Our review suggests that the steps of each mechanism are known to occur individually in many different systems, but no scenario has been thoroughly investigated in any one system. Nevertheless, studies of Dalechampia and its herbivores and pollinators, and patterns of defense tradeoffs in trees on different soil types in the Peruvian Amazon provide evidence consistent with the original hypotheses of Ehrlich and Raven. For herbivores to drive sympatric speciation, our findings suggest that interactions with both their herbivores and their pollinators should be considered. In contrast, herbivores may drive speciation allopatrically without any influence by pollinators. Finally, there is evidence that these mechanisms are more likely to occur at low latitudes and thus more likely to produce new species in the tropics. The mechanisms we outline provide a predictive framework for further study of the general role that herbivores play in diversification of their host plants.
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Affiliation(s)
- Robert J Marquis
- Department of Biology and Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
| | - Diego Salazar
- Department of Biology and Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA.,Department of Integrative Biology, University of California-Berkeley, 3040 Valley Life Sciences Bldg #3140, Berkeley, California, 94720, USA
| | - Christina Baer
- Department of Biology and Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
| | - Jason Reinhardt
- Department of Biology and Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA.,Department of Forest Resources, University of Minnesota, 1530 Cleveland Ave. N., St. Paul, Minnesota, 55108, USA
| | - Galen Priest
- Department of Biology and Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA
| | - Kirk Barnett
- Department of Biology and Whitney R. Harris World Ecology Center, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri, 63121, USA.,Hawkesbury Institute for the Environment, Western Sydney University, Hawkesbury Campus, Penrith, New South Wales, 2751, Australia
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147
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Cuervo M, Rakosy D, Martel C, Schulz S, Ayasse M. Sexual Deception in the Eucera-Pollinated Ophrys leochroma: A Chemical Intermediate between Wasp- and Andrena-Pollinated Species. J Chem Ecol 2017; 43:469-479. [PMID: 28536987 DOI: 10.1007/s10886-017-0848-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 03/13/2017] [Accepted: 04/24/2017] [Indexed: 10/19/2022]
Abstract
Ophrys flowers mimic sex pheromones of attractive females of their pollinators and attract males, which attempt to copulate with the flower and thereby pollinate it. Virgin females and orchid flowers are known to use the same chemical compounds in order to attract males. The composition of the sex pheromone and its floral analogue, however, vary between pollinator genera. Wasp-pollinated Ophrys species attract their pollinators by using polar hydroxy acids, whereas Andrena-pollinated species use a mixture of non-polar hydrocarbons. The phylogeny of Ophrys shows that its evolution was marked by episodes of rapid diversification coinciding with shifts to different pollinator groups: from wasps to Eucera and consequently to Andrena and other bees. To gain further insights, we studied pollinator attraction in O. leochroma in the context of intra- and inter-generic pollinator shifts, radiation, and diversification in the genus Ophrys. Our model species, O. leochroma, is pollinated by Eucera kullenbergi males and lies in the phylogeny between the wasp and Andrena-pollinated species; therefore, it is a remarkable point to understand pollinator shifts. We collected surface extracts of attractive E. kullenbergi females and labellum extracts of O. leochroma and analyzed them by using gas chromatography with electroantennographic detection (GC-EAD) and gas chromatography coupled with mass spectrometry (GC-MS). We also performed field bioassays. Our results show that O. leochroma mimics the sex pheromone of its pollinator's female by using aldehydes, alcohols, fatty acids, and non-polar compounds (hydrocarbons). Therefore, in terms of the chemistry of pollinator attraction, Eucera-pollinated Ophrys species might represent an intermediate stage between wasp- and Andrena-pollinated orchid species.
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Affiliation(s)
- Monica Cuervo
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Helmholtzstraße 10-1, Containerstadt, 89081, Ulm, Germany.
| | - Demetra Rakosy
- Department of Integrative Zoology, University of Vienna, Althanstraße 14, 1090, Vienna, Austria
| | - Carlos Martel
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Helmholtzstraße 10-1, Containerstadt, 89081, Ulm, Germany
| | - Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Manfred Ayasse
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Helmholtzstraße 10-1, Containerstadt, 89081, Ulm, Germany
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148
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Trunschke J, Sletvold N, Ågren J. Interaction intensity and pollinator-mediated selection. THE NEW PHYTOLOGIST 2017; 214:1381-1389. [PMID: 28240377 DOI: 10.1111/nph.14479] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 01/15/2017] [Indexed: 05/26/2023]
Abstract
In animal-pollinated plants, the opportunity for selection and the strength of pollinator-mediated selection are expected to increase with the degree of pollen limitation. However, whether differences in pollen limitation can explain variation in pollinator-mediated and net selection among animal-pollinated species is poorly understood. In the present study, we quantified pollen limitation, variance in relative fitness and pollinator-mediated selection on five traits important for pollinator attraction (flowering start, plant height, flower number, flower size) and pollination efficiency (spur length) in natural populations of 12 orchid species. Pollinator-mediated selection was quantified by subtracting estimates of selection gradients for plants receiving supplemental hand-pollination from estimates obtained for open-pollinated control plants. Mean pollen limitation ranged from zero to 0.96. Opportunity for selection, pollinator-mediated selection and net selection were all positively related to pollen limitation, whereas nonpollinator-mediated selection was not. Opportunity for selection varied five-fold, strength of pollinator-mediated selection varied three-fold and net selection varied 1.5-fold among species. Supplemental hand-pollination reduced both opportunity for selection and selection on floral traits. The results show that the intensity of biotic interactions is an important determinant of the selection regime, and indicate that the potential for pollinator-mediated selection and divergence in floral traits is particularly high in species that are strongly pollen-limited.
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Affiliation(s)
- Judith Trunschke
- Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18 D, Uppsala, SE-752 36, Sweden
| | - Nina Sletvold
- Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18 D, Uppsala, SE-752 36, Sweden
| | - Jon Ågren
- Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18 D, Uppsala, SE-752 36, Sweden
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149
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Bendall EE, Vertacnik KL, Linnen CR. Oviposition traits generate extrinsic postzygotic isolation between two pine sawfly species. BMC Evol Biol 2017; 17:26. [PMID: 28103815 PMCID: PMC5248504 DOI: 10.1186/s12862-017-0872-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 01/05/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Although empirical data indicate that ecological speciation is prevalent in nature, the relative importance of different forms of reproductive isolation and the traits generating reproductive isolation remain unclear. To address these questions, we examined a pair of ecologically divergent pine-sawfly species: while Neodiprion pinetum specializes on a thin-needled pine (Pinus strobus), N. lecontei utilizes thicker-needled pines. We hypothesized that extrinsic postzygotic isolation is generated by oviposition traits. To test this hypothesis, we assayed ovipositor morphology, oviposition behavior, and host-dependent oviposition success in both species and in F1 and backcross females. RESULTS Compared to N. lecontei, N. pinetum females preferred P. strobus more strongly, had smaller ovipositors, and laid fewer eggs per needle. Additionally, we observed host- and trait-dependent reductions in oviposition success in F1 and backcross females. Hybrid females that had pinetum-like host preference (P. strobus) and lecontei-like oviposition traits (morphology and egg pattern) fared especially poorly. CONCLUSIONS Together, these data indicate that maladaptive combinations of oviposition traits in hybrids contribute to extrinsic postzygotic isolation between N. lecontei and N. pinetum, suggesting that oviposition traits may be an important driver of divergence in phytophagous insects.
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Affiliation(s)
- Emily E Bendall
- Department of Biology, University of Kentucky, 204 TH Morgan Building, Lexington, KY, 40506, USA.
| | - Kim L Vertacnik
- Department of Biology, University of Kentucky, 204 TH Morgan Building, Lexington, KY, 40506, USA
| | - Catherine R Linnen
- Department of Biology, University of Kentucky, 204 TH Morgan Building, Lexington, KY, 40506, USA
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150
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Gegear RJ, Burns R, Swoboda-Bhattarai KA. “Hummingbird” floral traits interact synergistically to discourage visitation by bumble bee foragers. Ecology 2017; 98:489-499. [DOI: 10.1002/ecy.1661] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 11/01/2016] [Accepted: 11/07/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Robert J. Gegear
- Department of Biology and Biotechnology; Worcester Polytechnic Institute; Worcester Massachusetts 01609-2280 USA
| | - Rebecca Burns
- Department of Biology and Biotechnology; Worcester Polytechnic Institute; Worcester Massachusetts 01609-2280 USA
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