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Kawahara AY, Storer C, Carvalho APS, Plotkin DM, Condamine FL, Braga MP, Ellis EA, St Laurent RA, Li X, Barve V, Cai L, Earl C, Frandsen PB, Owens HL, Valencia-Montoya WA, Aduse-Poku K, Toussaint EFA, Dexter KM, Doleck T, Markee A, Messcher R, Nguyen YL, Badon JAT, Benítez HA, Braby MF, Buenavente PAC, Chan WP, Collins SC, Rabideau Childers RA, Dankowicz E, Eastwood R, Fric ZF, Gott RJ, Hall JPW, Hallwachs W, Hardy NB, Sipe RLH, Heath A, Hinolan JD, Homziak NT, Hsu YF, Inayoshi Y, Itliong MGA, Janzen DH, Kitching IJ, Kunte K, Lamas G, Landis MJ, Larsen EA, Larsen TB, Leong JV, Lukhtanov V, Maier CA, Martinez JI, Martins DJ, Maruyama K, Maunsell SC, Mega NO, Monastyrskii A, Morais ABB, Müller CJ, Naive MAK, Nielsen G, Padrón PS, Peggie D, Romanowski HP, Sáfián S, Saito M, Schröder S, Shirey V, Soltis D, Soltis P, Sourakov A, Talavera G, Vila R, Vlasanek P, Wang H, Warren AD, Willmott KR, Yago M, Jetz W, Jarzyna MA, Breinholt JW, Espeland M, Ries L, Guralnick RP, Pierce NE, Lohman DJ. A global phylogeny of butterflies reveals their evolutionary history, ancestral hosts and biogeographic origins. Nat Ecol Evol 2023; 7:903-913. [PMID: 37188966 PMCID: PMC10250192 DOI: 10.1038/s41559-023-02041-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Accepted: 03/16/2023] [Indexed: 05/17/2023]
Abstract
Butterflies are a diverse and charismatic insect group that are thought to have evolved with plants and dispersed throughout the world in response to key geological events. However, these hypotheses have not been extensively tested because a comprehensive phylogenetic framework and datasets for butterfly larval hosts and global distributions are lacking. We sequenced 391 genes from nearly 2,300 butterfly species, sampled from 90 countries and 28 specimen collections, to reconstruct a new phylogenomic tree of butterflies representing 92% of all genera. Our phylogeny has strong support for nearly all nodes and demonstrates that at least 36 butterfly tribes require reclassification. Divergence time analyses imply an origin ~100 million years ago for butterflies and indicate that all but one family were present before the K/Pg extinction event. We aggregated larval host datasets and global distribution records and found that butterflies are likely to have first fed on Fabaceae and originated in what is now the Americas. Soon after the Cretaceous Thermal Maximum, butterflies crossed Beringia and diversified in the Palaeotropics. Our results also reveal that most butterfly species are specialists that feed on only one larval host plant family. However, generalist butterflies that consume two or more plant families usually feed on closely related plants.
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Affiliation(s)
- Akito Y Kawahara
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA.
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA.
- Department of Biology, University of Florida, Gainesville, FL, USA.
| | - Caroline Storer
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Ana Paula S Carvalho
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - David M Plotkin
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
| | - Fabien L Condamine
- CNRS, Institut des Sciences de l'Evolution de Montpellier (Université de Montpellier), Montpellier, France
| | - Mariana P Braga
- Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
- Department of Biology, Washington University in St. Louis, St. Louis, MO, USA
| | - Emily A Ellis
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Ryan A St Laurent
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Xuankun Li
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Center for Biodiversity Research, Department of Biological Sciences, University of Memphis, Memphis, TN, USA
| | - Vijay Barve
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Liming Cai
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
- Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA, USA
| | - Chandra Earl
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Paul B Frandsen
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA
| | - Hannah L Owens
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Center for Global Mountain Biodiversity, Globe Institute, University of Copenhagen, Copenhagen, Denmark
- Center for Macroecology, Evolution, and Climate, GLOBE Institute, University of Copenhagen, Copenhagen, Denmark
| | - Wendy A Valencia-Montoya
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Kwaku Aduse-Poku
- Biology Department, City College of New York, City University of New York, New York, NY, USA
- Department of Life and Earth Sciences, Perimeter College, Georgia State University, Decatur, GA, USA
| | - Emmanuel F A Toussaint
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Department of Entomology, Natural History Museum of Geneva, Geneva, Switzerland
| | - Kelly M Dexter
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Tenzing Doleck
- Biology Department, City College of New York, City University of New York, New York, NY, USA
- PhD Program in Biology, Graduate Center, City University of New York, New York, NY, USA
| | - Amanda Markee
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Rebeccah Messcher
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Y-Lan Nguyen
- Biology Department, City College of New York, City University of New York, New York, NY, USA
| | - Jade Aster T Badon
- Animal Biology Division, Institute of Biological Sciences, University of the Philippines Los Baños, Laguna, Philippines
| | - Hugo A Benítez
- Laboratorio de Ecología y Morfometría Evolutiva, Centro de Investigación de Estudios Avanzados del Maule, Universidad Católica del Maule, Talca, Chile
- Millennium Institute Biodiversity of Antarctic and Subantarctic Ecosystems (BASE), Santiago, Chile
| | - Michael F Braby
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Acton, Canberra, Australian Capital Territory, Australia
- Australian National Insect Collection, Canberra, Australian Capital Territory, Australia
| | | | - Wei-Ping Chan
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | | | - Richard A Rabideau Childers
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Even Dankowicz
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Rod Eastwood
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Zdenek F Fric
- Biology Centre CAS, České Budějovice, Czech Republic
| | - Riley J Gott
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
| | - Jason P W Hall
- Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Winnie Hallwachs
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
| | - Rachel L Hawkins Sipe
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Alan Heath
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
- Iziko South African Museum, Cape Town, South Africa
| | - Jomar D Hinolan
- Botany and National Herbarium Division, National Museum of the Philippines, Manila, Philippines
| | - Nicholas T Homziak
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
| | - Yu-Feng Hsu
- College of Life Science, National Taiwan Normal University, Taipei, Taiwan
| | | | - Micael G A Itliong
- Biology Department, City College of New York, City University of New York, New York, NY, USA
| | - Daniel H Janzen
- Department of Biology, University of Pennsylvania, Philadelphia, PA, USA
| | | | - Krushnamegh Kunte
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru, India
| | - Gerardo Lamas
- Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Michael J Landis
- Department of Biology, Washington University in St. Louis, St. Louis, MO, USA
| | - Elise A Larsen
- Department of Biology, Georgetown University, Washington, DC, USA
| | | | - Jing V Leong
- Biology Department, City College of New York, City University of New York, New York, NY, USA
- Biology Centre CAS, České Budějovice, Czech Republic
- Faculty of Science, Department of Zoology, University of South Bohemia, České Budějovice, Czech Republic
| | - Vladimir Lukhtanov
- Department of Karyosystematics, Zoological Institute of Russian Academy of Sciences, St. Petersburg, Russia
| | - Crystal A Maier
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Jose I Martinez
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Entomology and Nematology Department, University of Florida, Gainesville, FL, USA
| | - Dino J Martins
- Turkana Basin Institute, Stony Brook University, Stony Brook, NY, USA
| | | | - Sarah C Maunsell
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Nicolás Oliveira Mega
- Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Alexander Monastyrskii
- Vietnam Programme, Fauna & Flora International, Hanoi, Vietnam
- Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Ana B B Morais
- Centro de Ciências Naturais e Exatas, Pós-Graduação em Biodiversidade Animal, Universidade Federal de Santa Maria, Santa Maria, Brazil
| | | | - Mark Arcebal K Naive
- Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, China
- University of Chinese Academy of Sciences, Beijing, China
- College of Arts and Sciences, Jose Rizal Memorial State University, Tampilisan, Philippines
| | | | - Pablo Sebastián Padrón
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Entomology Laboratory, Museo de Zoología, Universidad del Azuay, Cuenca, Ecuador
| | - Djunijanti Peggie
- Research Center for Biosystematics and Evolution, National Research and Innovation Agency (BRIN), Cibinong-Bogor, Indonesia
| | | | - Szabolcs Sáfián
- Institute of Silviculture and Forest Protection, University of West Hungary, Sopron, Hungary
| | - Motoki Saito
- The Research Institute of Evolutionary Biology (Insect Study Division), Setagaya, Japan
| | | | - Vaughn Shirey
- Department of Biology, Georgetown University, Washington, DC, USA
| | - Doug Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Pamela Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Andrei Sourakov
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Gerard Talavera
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
- Institut Botànic de Barcelona (IBB, CSIC-Ajuntament de Barcelona), Barcelona, Spain
| | - Roger Vila
- Institut de Biologia Evolutiva (CSIC-Univ. Pompeu Fabra), Barcelona, Spain
| | - Petr Vlasanek
- T.G. Masaryk Water Research Institute, Prague, Czech Republic
| | - Houshuai Wang
- Department of Entomology, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Andrew D Warren
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Keith R Willmott
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Masaya Yago
- The University Museum, The University of Tokyo, Tokyo, Japan
| | - Walter Jetz
- Department of Ecology & Evolutionary Biology, Yale University, New Haven, CT, USA
- Center for Biodiversity and Global Change, Yale University, New Haven, CT, USA
| | - Marta A Jarzyna
- Department of Ecology & Evolutionary Biology, Yale University, New Haven, CT, USA
- Translational Data Analytics Institute, The Ohio State University, Columbus, OH, USA
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH, USA
| | - Jesse W Breinholt
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- RAPiD Genomics, Gainesville, FL, USA
| | - Marianne Espeland
- Leibniz Institute for the Analysis of Biodiversity Change, Zoological Research Museum Alexander Koenig, Bonn, Germany
| | - Leslie Ries
- Department of Biology, Georgetown University, Washington, DC, USA
| | - Robert P Guralnick
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
| | - Naomi E Pierce
- Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA.
| | - David J Lohman
- Biology Department, City College of New York, City University of New York, New York, NY, USA.
- PhD Program in Biology, Graduate Center, City University of New York, New York, NY, USA.
- Entomology Section, National Museum of Natural History, Manila, Philippines.
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2
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Saleh Ziabari O, Li B, Hardy NB, Brisson JA. Aphid male wing polymorphisms are transient and have evolved repeatedly. Evolution 2023; 77:1056-1065. [PMID: 36773025 PMCID: PMC10078941 DOI: 10.1093/evolut/qpad024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 01/20/2023] [Accepted: 02/09/2023] [Indexed: 02/12/2023]
Abstract
Polymorphic phenotypes have long been used to examine the maintenance of genetic variation within and between species. Most studies have focused on persistent polymorphisms, which are retained across species boundaries, and their positive effects on speciation rates. Far less is known about the macroevolutionary impacts of more transient polymorphisms, which are also common. Here we investigated male wing polymorphisms in aphids. We estimated the phylogenetic history of wing states across species, along with several other traits that could affect wing evolution. We found that male wing polymorphisms are transient: they are found in only ~4% of extant species, but have likely evolved repeatedly across the phylogeny. We reason that the repeated evolution of transient polymorphisms might be facilitated by the existence of the asexual female wing plasticity, which is common across aphids, and would maintain the wing development program even in species with wingless males. We also discovered that male wingedness correlates positively with host plant alternation and host plant breadth, and that winged morphs and wing polymorphisms may be associated with higher speciation rates. Our results provide new evolutionary insights into this well-studied group and suggest that even transient polymorphisms may impact species diversification rates.
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Affiliation(s)
- Omid Saleh Ziabari
- Department of Biology, University of Rochester, Rochester, United States
| | - Binshuang Li
- Department of Biology, University of Rochester, Rochester, United States
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, United States
| | - Jennifer A Brisson
- Department of Biology, University of Rochester, Rochester, United States
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3
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Hardy NB, Forister ML. Niche Specificity, Polygeny, and Pleiotropy in Herbivorous Insects. Am Nat 2023; 201:376-388. [PMID: 36848511 DOI: 10.1086/722568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractWhat causes host use specificity in herbivorous insects? Population genetic models predict specialization when habitat preference can evolve and there is antagonistic pleiotropy at a performance-affecting locus. But empirically for herbivorous insects, host use performance is governed by many genetic loci, and antagonistic pleiotropy seems to be rare. Here, we use individual-based quantitative genetic simulation models to investigate the role of pleiotropy in the evolution of sympatric host use specialization when performance and preference are quantitative traits. We look first at pleiotropies affecting only host use performance. We find that when the host environment changes slowly, the evolution of host use specialization requires levels of antagonistic pleiotropy much higher than what has been observed in nature. On the other hand, with rapid environmental change or pronounced asymmetries in productivity across host species, the evolution of host use specialization readily occurs without pleiotropy. When pleiotropies affect preference as well as performance, even with slow environmental change and host species of equal productivity, we observe fluctuations in host use breadth, with mean specificity increasing with the pervasiveness of antagonistic pleiotropy. Thus, our simulations show that pleiotropy is not necessary for specialization, although it can be sufficient, provided it is extensive or multifarious.
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4
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Hardy NB. Delaying quantitative resistance to pesticides and antibiotics. Evol Appl 2022; 15:2067-2077. [DOI: 10.1111/eva.13497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 09/20/2022] [Accepted: 10/03/2022] [Indexed: 11/27/2022] Open
Affiliation(s)
- Nate B. Hardy
- Department of Entomology and Plant Pathology Auburn University Auburn Alabama USA
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5
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Crossley MS, Snyder WE, Hardy NB. Insect-plant relationships predict the speed of insecticide adaptation. Evol Appl 2021; 14:290-296. [PMID: 33664776 PMCID: PMC7896708 DOI: 10.1111/eva.13089] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 07/31/2020] [Accepted: 08/04/2020] [Indexed: 11/27/2022] Open
Abstract
Herbivorous insects must circumvent the chemical defenses of their host plants and, in cropping systems, must also circumvent synthetic insecticides. The pre-adaptation hypothesis posits that when herbivorous insects evolve resistance to insecticides, they co-opt adaptations against host plant defenses. Despite its intuitive appeal, few predictions of this hypothesis have been tested systematically. Here, with survival analysis of more than 17,000 herbivore-insecticide interactions, we show that resistance evolution tends to be faster when herbivorous insect diets are broad (but not too broad) and when insecticides and plant defensive chemicals are similar (but not too similar). These general relations suggest a complex interplay between macro-evolutionary contingencies and contemporary population genetic processes, and provide a predictive framework to forecast which pest species are most likely to develop resistance to particular insecticide chemistries.
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Affiliation(s)
| | | | - Nate B. Hardy
- Department of Entomology and Plant PathologyAuburn UniversityAuburnALUSA
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Affiliation(s)
- Gwendolyn Bird
- Department of Entomology and Plant Pathology Auburn University Auburn AL USA
| | - Alan E. Wilson
- School of Fisheries, Aquaculture, and Aquatic Sciences Auburn University Auburn AL USA
| | | | - Nate B. Hardy
- Department of Entomology and Plant Pathology Auburn University Auburn AL USA
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Peterson DA, Hardy NB, Morse GE, Itioka T, Wei J, Normark BB. Nonadaptive host-use specificity in tropical armored scale insects. Ecol Evol 2020; 10:12910-12919. [PMID: 33304503 PMCID: PMC7713922 DOI: 10.1002/ece3.6867] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 08/14/2020] [Accepted: 09/08/2020] [Indexed: 01/05/2023] Open
Abstract
Most herbivorous insects are diet specialists in spite of the apparent advantages of being a generalist. This conundrum might be explained by fitness trade-offs on alternative host plants, yet the evidence of such trade-offs has been elusive. Another hypothesis is that specialization is nonadaptive, evolving through neutral population-genetic processes and within the bounds of historical constraints. Here, we report on a striking lack of evidence for the adaptiveness of specificity in tropical canopy communities of armored scale insects. We find evidence of pervasive diet specialization, and find that host use is phylogenetically conservative, but also find that more-specialized species occur on fewer of their potential hosts than do less-specialized species, and are no more abundant where they do occur. Of course local communities might not reflect regional diversity patterns. But based on our samples, comprising hundreds of species of hosts and armored scale insects at two widely separated sites, more-specialized species do not appear to outperform more generalist species.
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Affiliation(s)
- Daniel A. Peterson
- Department of Biology and Graduate Program in Organismic and Evolutionary BiologyUniversity of MassachusettsAmherstMAUSA
| | - Nate B. Hardy
- Department of Entomology and Plant PathologyAuburn UniversityAuburnALUSA
| | | | - Takao Itioka
- Graduate School of Human and Environmental StudiesKyoto UniversityKyotoJapan
| | - Jiufeng Wei
- College of AgricultureShanxi Agricultural UniversityTaiguChina
| | - Benjamin B. Normark
- Department of Biology and Graduate Program in Organismic and Evolutionary BiologyUniversity of MassachusettsAmherstMAUSA
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Abstract
Half a million species of herbivorous insects have been described. Most of them are diet specialists, using only a few plant species as hosts. Biologists suspect that their specificity is key to their diversity. But why do herbivorous insects tend to be diet specialists? In this review, we catalog a broad range of explanations. We review the evidence for each and suggest lines of research to obtain the evidence we lack. We then draw attention to a second major question, namely how changes in diet breadth affect the rest of a species’ biology. In particular, we know little about how changes in diet breadth feed back on genetic architecture, the population genetic environment, and other aspects of a species’ ecology. Knowing more about how generalists and specialists differ should go a long way toward sorting out potential explanations of specificity, and yield a deeper understanding of herbivorous insect diversity.
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Affiliation(s)
- Nate B. Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama 36849, USA
| | - Chloe Kaczvinsky
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama 36849, USA
| | - Gwendolyn Bird
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama 36849, USA
| | - Benjamin B. Normark
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts 01003, USA
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Oforka LC, Adeleke MA, Anikwe JC, Hardy NB, Mathias DK, Makanjuola WA, Fadamiro HY. Biting Rates and Onchocerca Infectivity Status of Black Flies from the Simulium damnosum Complex (Diptera: Simuliidae) in Osun State, Nigeria. J Med Entomol 2020; 57:901-907. [PMID: 31901168 DOI: 10.1093/jme/tjz250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Indexed: 06/10/2023]
Abstract
The Simulium damnosum Theobald complex transmits Onchocerca volvulus Leuckart (Spirurida: Onchocercidae), the causative agent of onchocerciasis. Recent evidence suggests that control efforts have strongly suppressed parasite populations, but vector surveillance is needed in parts of Africa where the disease remains endemic. Here, studies on biting rates and infectivity status of suspected vector species were conducted in three onchocerciasis-endemic areas, namely Iwo, Ede, and Obokun, in Osun State, Nigeria. A total of 3,035 black flies were collected between October 2014 and September 2016, and examined for parity and parasites using standard methods. A separate collection of 2,000 black flies was pool-screened for infectivity using polymerase chain reaction (PCR) amplification of the O-150 marker. Results showed that parous flies were significantly less common than nulliparous flies with overall parous rates of 8.02% in Iwo and 35.38% in Ede at the end of the study period. Obokun had a parous rate of 22.22% obtained in the first year only. None of the dissected parous flies were infected with O. volvulus and PCR assays showed no amplification of O-150 O. volvulus-specific repeats in head and body pools. However, annual biting rates exceeded the World Health Organization threshold of 1,000 bites/person/yr. Thus it appears that, with such high rates of biting, even low levels of vector infection can sustain onchocerciasis in African communities.
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Affiliation(s)
- Linda C Oforka
- Department of Zoology, University of Lagos, Akoka, Yaba, 101017, Lagos, Nigeria
| | - Monsuru A Adeleke
- Department of Zoology, Osun State University, P.M.B 4494, Osogbo, Nigeria
| | - Joseph C Anikwe
- Department of Zoology, University of Lagos, Akoka, Yaba, 101017, Lagos, Nigeria
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL
| | - Derrick K Mathias
- Florida Medical Entomology Laboratory, Institute of Food and Agricultural Sciences, University of Florida, Vero Beach, FL
| | | | - Henry Y Fadamiro
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL
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Kaczvinsky C, Hardy NB. Do major host shifts spark diversification in butterflies? Ecol Evol 2020; 10:3636-3646. [PMID: 32313623 PMCID: PMC7160180 DOI: 10.1002/ece3.6116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 01/24/2020] [Accepted: 01/30/2020] [Indexed: 11/28/2022] Open
Abstract
The Escape and Radiate Hypothesis posits that herbivorous insects and their host plants diversify through antagonistic coevolutionary adaptive radiation. For more than 50 years, it has inspired predictions about herbivorous insect macro-evolution, but only recently have the resources begun to fall into place for rigorous testing of those predictions. Here, with comparative phylogenetic analyses of nymphalid butterflies, we test two of these predictions: that major host switches tend to increase species diversification and that such increases will be proportional to the scope of ecological opportunity afforded by a particular novel host association. We find that by and large the effect of major host-use changes on butterfly diversity is the opposite of what was predicted; although it appears that the evolution of a few novel host associations can cause short-term bursts of speciation, in general, major changes in host use tend to be linked to significant long-term decreases in butterfly species richness.
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Affiliation(s)
- Chloe Kaczvinsky
- Department of Entomology and Plant PathologyAuburn UniversityAuburnALUSA
| | - Nate B. Hardy
- Department of Entomology and Plant PathologyAuburn UniversityAuburnALUSA
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11
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Bird G, Kaczvinsky C, Wilson AE, Hardy NB. When do herbivorous insects compete? A phylogenetic meta-analysis. Ecol Lett 2019; 22:875-883. [PMID: 30848045 DOI: 10.1111/ele.13245] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 11/23/2018] [Accepted: 02/08/2019] [Indexed: 12/15/2022]
Abstract
When herbivorous insects interact, they can increase or decrease each other's fitness. As it stands, we know little of what causes this variation. Classic competition theory predicts that competition will increase with niche overlap and population density. And classic hypotheses of herbivorous insect diversification predict that diet specialists will be superior competitors to generalists. Here, we test these predictions using phylogenetic meta-analysis. We estimate the effects of diet breadth, population density and proxies of niche overlap: phylogenetic relatedness, physical proximity and feeding-guild membership. As predicted, we find that competition between herbivorous insects increases with population density as well as phylogenetic and physical proximity. Contrary to predictions, competition tends to be stronger between than within feeding guilds and affects specialists as much as generalists. This is the first statistical evidence that niche overlap increases competition between herbivorous insects. However, niche overlap is not everything; complex feeding guild effects indicate important indirect interactions.
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Affiliation(s)
- Gwendolyn Bird
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
| | - Chloe Kaczvinsky
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
| | - Alan E Wilson
- School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, Auburn, AL, USA
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, USA
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12
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Hardy NB, Beardsley JW, Gullan PJ. A revision of Lachnodius Maskell (Hemiptera, Coccomorpha, Eriococcidae). Zookeys 2019:43-88. [PMID: 30700966 PMCID: PMC6349806 DOI: 10.3897/zookeys.818.32061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 12/13/2018] [Indexed: 11/12/2022] Open
Abstract
Lachnodius Maskell is a genus of three named species that are part of an Australian radiation of felt scale insects that induce galls on Eucalyptus and Corymbia (Myrtaceae). A female's gall usually consists of an open-top pit in swollen plant tissue. Depending on the species, galls can occur on a host's leaves, buds, stems, or trunk. Here, we redescribe the named species: L.eucalypti (Maskell), L.hirsutus (Froggatt) and L.lectularius (Maskell), and describe seven new species: L.brimblecombei Beardsley, Gullan & Hardy, sp. n., L.froggatti Beardsley, Gullan & Hardy, sp. n., L.maculosus Beardsley, Gullan & Hardy, sp. n., L.melliodorae Beardsley, Gullan & Hardy, sp. n., L.newi Beardsley, Gullan & Hardy, sp. n., L.parathrix Beardsley, Gullan & Hardy, sp. n., L.sealakeensis Gullan & Hardy, sp. n. Descriptions are based primarily on adult females, but for some species short diagnoses of nymphal stages also are provided. The taxonomic history of Lachnodius is reviewed, with notes on their biology and ecology. A key to species based on the morphology of adult females is provided, and lectotypes are designated for Dactylopiuseucalypti Maskell and Lachnodiuslectularius Maskell.
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Affiliation(s)
- Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, USA Auburn University Auburn United States of America
| | - John W Beardsley
- Formerly of Department of Entomology, University of Hawaii, Hawaii, U.S.A.; deceased 5 February 2001 University of Hawaii Hawaii United States of America
| | - Penny J Gullan
- Division of Ecology & Evolution, Research School of Biology, The Australian National University, Acton, A.C.T., 2601, Australia Australian National University Canberra Australia
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13
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Johnson KP, Dietrich CH, Friedrich F, Beutel RG, Wipfler B, Peters RS, Allen JM, Petersen M, Donath A, Walden KKO, Kozlov AM, Podsiadlowski L, Mayer C, Meusemann K, Vasilikopoulos A, Waterhouse RM, Cameron SL, Weirauch C, Swanson DR, Percy DM, Hardy NB, Terry I, Liu S, Zhou X, Misof B, Robertson HM, Yoshizawa K. Phylogenomics and the evolution of hemipteroid insects. Proc Natl Acad Sci U S A 2018; 115:12775-12780. [PMID: 30478043 PMCID: PMC6294958 DOI: 10.1073/pnas.1815820115] [Citation(s) in RCA: 155] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Hemipteroid insects (Paraneoptera), with over 10% of all known insect diversity, are a major component of terrestrial and aquatic ecosystems. Previous phylogenetic analyses have not consistently resolved the relationships among major hemipteroid lineages. We provide maximum likelihood-based phylogenomic analyses of a taxonomically comprehensive dataset comprising sequences of 2,395 single-copy, protein-coding genes for 193 samples of hemipteroid insects and outgroups. These analyses yield a well-supported phylogeny for hemipteroid insects. Monophyly of each of the three hemipteroid orders (Psocodea, Thysanoptera, and Hemiptera) is strongly supported, as are most relationships among suborders and families. Thysanoptera (thrips) is strongly supported as sister to Hemiptera. However, as in a recent large-scale analysis sampling all insect orders, trees from our data matrices support Psocodea (bark lice and parasitic lice) as the sister group to the holometabolous insects (those with complete metamorphosis). In contrast, four-cluster likelihood mapping of these data does not support this result. A molecular dating analysis using 23 fossil calibration points suggests hemipteroid insects began diversifying before the Carboniferous, over 365 million years ago. We also explore implications for understanding the timing of diversification, the evolution of morphological traits, and the evolution of mitochondrial genome organization. These results provide a phylogenetic framework for future studies of the group.
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Affiliation(s)
- Kevin P Johnson
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Champaign, IL 61820;
| | - Christopher H Dietrich
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Champaign, IL 61820
| | - Frank Friedrich
- Institut für Zoologie, Universität Hamburg, 20146 Hamburg, Germany
| | - Rolf G Beutel
- Institut für Zoologie und Evolutionsforschung, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
| | - Benjamin Wipfler
- Institut für Zoologie und Evolutionsforschung, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
- Center of Taxonomy and Evolutionary Research, Arthropoda Department, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Ralph S Peters
- Center of Taxonomy and Evolutionary Research, Arthropoda Department, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Julie M Allen
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Champaign, IL 61820
- Department of Biology, University of Nevada, Reno, NV 89557
| | - Malte Petersen
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Alexander Donath
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Kimberly K O Walden
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Alexey M Kozlov
- Scientific Computing Group, Heidelberg Institute for Theoretical Studies, 69118 Heidelberg, Germany
| | - Lars Podsiadlowski
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
- Institute of Evolutionary Biology and Ecology, University of Bonn, 53121 Bonn, Germany
| | - Christoph Mayer
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Karen Meusemann
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
- Evolutionary Biology and Ecology, Institute for Biology I (Zoology), University of Freiburg, 79104 Freiburg, Germany
- Australian National Insect Collection, Commonwealth Scientific and Industrial Research Organisation National Research Collections Australia, Acton, ACT 2601 Canberra, Australia
| | - Alexandros Vasilikopoulos
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Robert M Waterhouse
- Department of Ecology and Evolution, University of Lausanne and Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Stephen L Cameron
- Department of Entomology, Purdue University, West Lafayette, IN 47907
| | | | - Daniel R Swanson
- Illinois Natural History Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, Champaign, IL 61820
| | - Diana M Percy
- Department of Life Sciences, Natural History Museum, London, SW7 5BD United Kingdom
- Department of Botany, University of British Columbia, Vancouver V6T 1Z4, Canada
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL 36849
| | - Irene Terry
- School of Biological Sciences, University of Utah, Salt Lake City, UT 84112
| | - Shanlin Liu
- BGI-Shenzhen, Shenzhen, 518083 Guangdong Province, People's Republic of China
| | - Xin Zhou
- Department of Entomology, China Agricultural University, 100193 Beijing, People's Republic of China
| | - Bernhard Misof
- Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, 53113 Bonn, Germany
| | - Hugh M Robertson
- Department of Entomology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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14
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Hardy NB, Williams DJ. Doubling the known endemic species diversity of New Caledonian armored scale insects (Hemiptera, Diaspididae). Zookeys 2018:11-47. [PMID: 30275718 PMCID: PMC6160803 DOI: 10.3897/zookeys.782.27938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Accepted: 07/20/2018] [Indexed: 12/03/2022] Open
Abstract
Fourteen species of armored scale insects are known only from New Caledonia. Here, the adult female of fourteen more are described: Agrophaspisansevataesp. n., Aonidiamontikoghissp. n., Aonidiapaucasp. n., Fernaldannawhitasp. n., Furcaspiscostulariaesp. n., Greeniellacasuarinaesp. n., Greenielladacrydiaesp. n., Lepidosaphesmonticolasp. n., Leptaspispegegen. et sp. n., Leucaspismontikoghissp. n., Melanaspisnothofagisp. n., Neomorganianothofagisp. n., Pseudaonidiadugdalisp. n., and Pseudaonidiayateensissp. n. We note that the diversity of New Caledonian armored scale insects appears to have resulted more from trans-oceanic dispersal than in situ speciation.
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Affiliation(s)
- Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, 301 Funchess Hall, Auburn, Alabama 36849, USA Auburn University Auburn United States of America
| | - Douglas J Williams
- Department of Life Sciences, The Natural History Museum, London, UK Department of Life Sciences, The Natural History Museum London United Kingdom
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15
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Hardy NB, Peterson DA, Ross L, Rosenheim JA. Does a plant-eating insect's diet govern the evolution of insecticide resistance? Comparative tests of the pre-adaptation hypothesis. Evol Appl 2017; 11:739-747. [PMID: 29875815 PMCID: PMC5979754 DOI: 10.1111/eva.12579] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 11/20/2017] [Indexed: 11/30/2022] Open
Abstract
According to the pre‐adaptation hypothesis, the evolution of insecticide resistance in plant‐eating insects co‐opts adaptations that initially evolved during chemical warfare with their host plants. Here, we used comparative statistics to test two predictions of this hypothesis: (i) Insects with more diverse diets should evolve resistance to more diverse insecticides. (ii) Feeding on host plants with strong or diverse qualitative chemical defenses should prime an insect lineage to evolve insecticide resistance. Both predictions are supported by our tests. What makes this especially noteworthy is that differences in the diets of plant‐eating insect species are typically ignored by the population genetic models we use to make predictions about insecticide resistance evolution. Those models surely capture some of the differences between host‐use generalists and specialists, for example, differences in population size and migration rates into treated fields, but they miss other potentially important differences, for example, differences in metabolic diversity and gene expression plasticity. Ignoring these differences could be costly.
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Affiliation(s)
- Nate B Hardy
- Department of Entomology and Plant Pathology Auburn University Auburn AL USA
| | - Daniel A Peterson
- Graduate Program in Organismic & Evolutionary Biology Department of Biology University of Massachusetts Amherst MA USA
| | - Laura Ross
- School of Biological Sciences Institute of Evolutionary Biology University of Edinburgh Edinburgh UK
| | - Jay A Rosenheim
- Department of Entomology and Nematology University of California Davis CA USA
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16
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Hamilton FB, Williams DJ, Hardy NB. Five new species of the armored scale genus Andaspis MacGillivray (Hemiptera, Coccomorpha, Diaspididae) from New Caledonia. Zookeys 2017:17-31. [PMID: 29133992 PMCID: PMC5672737 DOI: 10.3897/zookeys.693.13074] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 08/11/2017] [Indexed: 11/12/2022] Open
Abstract
New Caledonia is home to many endemic species of plants and animals. Here, we improve our grasp on that biota by describing five new species of armored scale insects in the genus Andaspis: Andaspis brevicornutasp. n, A. conicasp. n., A. nothofagisp. n., A. novaecaledoniaesp. n., and A. ornatasp. n. Each is known exclusively from collections on southern beeches (Nothofagus spp.) in New Caledonia. A key to the species of Andaspis of New Caledonia is provided.
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Affiliation(s)
- Fredericka B Hamilton
- Auburn University, Department of Entomology and Plant Pathology, 301 Funchess Hall, Auburn, AL 36849, USA
| | - Douglas J Williams
- The Natural History Museum, Department of Life Sciences (Entomology), Cromwell Road, London SW7 5BD, UK
| | - Nate B Hardy
- Auburn University, Department of Entomology and Plant Pathology, 301 Funchess Hall, Auburn, AL 36849, USA
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17
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Hardy NB. Do plant‐eating insect lineages pass through phases of host‐use generalism during speciation and host switching? Phylogenetic evidence. Evolution 2017; 71:2100-2109. [DOI: 10.1111/evo.13292] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 05/23/2017] [Indexed: 02/06/2023]
Affiliation(s)
- Nate B. Hardy
- Department of Entomology and Plant Pathology Auburn University 301 Funchess Hall Auburn Alabama 36849
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18
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Christodoulides N, Van Dam AR, Peterson DA, Frandsen RJN, Mortensen UH, Petersen B, Rasmussen S, Normark BB, Hardy NB. Gene expression plasticity across hosts of an invasive scale insect species. PLoS One 2017; 12:e0176956. [PMID: 28472112 PMCID: PMC5417585 DOI: 10.1371/journal.pone.0176956] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 04/19/2017] [Indexed: 12/19/2022] Open
Abstract
For plant-eating insects, we still have only a nascent understanding of the genetic basis of host-use promiscuity. Here, to improve that situation, we investigated host-induced gene expression plasticity in the invasive lobate lac scale insect, Paratachardina pseudolobata (Hemiptera: Keriidae). We were particularly interested in the differential expression of detoxification and effector genes, which are thought to be critical for overcoming a plant's chemical defenses. We collected RNA samples from P. pseudolobata on three different host plant species, assembled transcriptomes de novo, and identified transcripts with significant host-induced gene expression changes. Gene expression plasticity was pervasive, but the expression of most detoxification and effector genes was insensitive to the host environment. Nevertheless, some types of detoxification genes were more differentially expressed than expected by chance. Moreover, we found evidence of a trade-off between expression of genes involved in primary and secondary metabolism; hosts that induced lower expression of genes for detoxification induced higher expression of genes for growth. Our findings are largely consonant with those of several recently published studies of other plant-eating insect species. Thus, across plant-eating insect species, there may be a common set of gene expression changes that enable host-use promiscuity.
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Affiliation(s)
- Nicholas Christodoulides
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, United States of America
| | - Alex R. Van Dam
- Biosynthetic Pathways Engineering, Department of Bioengineering, Denmark Technical University, Søltofts plads, Lyngby, Denmark
| | - Daniel A. Peterson
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts, United States of America
| | - Rasmus John Normand Frandsen
- Biosynthetic Pathways Engineering, Department of Bioengineering, Denmark Technical University, Søltofts plads, Lyngby, Denmark
| | - Uffe Hasbro Mortensen
- Biosynthetic Pathways Engineering, Department of Bioengineering, Denmark Technical University, Søltofts plads, Lyngby, Denmark
| | - Bent Petersen
- Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark, Kemitorvet, Lyngby, Denmark
| | - Simon Rasmussen
- Center for Biological Sequence Analysis, Department of Systems Biology, Technical University of Denmark, Kemitorvet, Lyngby, Denmark
| | - Benjamin B. Normark
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts, United States of America
| | - Nate B. Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, United States of America
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19
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Abstract
A long-standing hypothesis asserts that plant-feeding insects specialize on particular host plants because of negative interactions (trade-offs) between adaptations to alternative hosts, yet empirical evidence for such trade-offs is scarce. Most studies have looked for microevolutionary performance trade-offs within insect species, but host use could also be constrained by macroevolutionary trade-offs caused by epistasis and historical contingency. Here we used a phylogenetic approach to estimate the micro- and macroevolutionary correlations between use of alternative host-plant taxa within two major orders of plant-feeding insects: Lepidoptera (caterpillars) and Hemiptera (true bugs). Across 1,604 caterpillar species, we found both positive and negative pairwise correlations between use of 11 host-plant orders, with overall network patterns suggesting that different host-use constraints act over micro- and macroevolutionary timescales. In contrast, host-use patterns of 955 true bug species revealed uniformly positive correlations between use of the same 11 host plant orders over both timescales. The lack of consistent patterns across timescales and insect orders indicates that host-use trade-offs are historically contingent rather than universal constraints. Moreover, we observed few negative correlations overall despite the wide taxonomic and ecological diversity of the focal host-plant orders, suggesting that positive interactions between host-use adaptations, not trade-offs, dominate the long-term evolution of host use in plant-feeding insects.
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20
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Hardy NB, Peterson DA, Normark BB. Nonadaptive radiation: Pervasive diet specialization by drift in scale insects? Evolution 2016; 70:2421-2428. [DOI: 10.1111/evo.13036] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 07/29/2016] [Accepted: 07/30/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Nate B. Hardy
- Department of Entomology and Plant Pathology, 301 Funchess Hall Auburn University Auburn Alabama 36849
| | - Daniel A. Peterson
- Graduate Program in Organismic & Evolutionary Biology, Department of Biology University of Massachusetts Amherst Massachusetts 01003
| | - Benjamin B. Normark
- Graduate Program in Organismic & Evolutionary Biology, Department of Biology University of Massachusetts Amherst Massachusetts 01003
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21
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García Morales M, Denno BD, Miller DR, Miller GL, Ben-Dov Y, Hardy NB. ScaleNet: a literature-based model of scale insect biology and systematics. Database (Oxford) 2016; 2016:bav118. [PMID: 26861659 PMCID: PMC4747323 DOI: 10.1093/database/bav118] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 11/24/2015] [Indexed: 11/14/2022]
Abstract
Scale insects (Hemiptera: Coccoidea) are small herbivorous insects found on all continents except Antarctica. They are extremely invasive, and many species are serious agricultural pests. They are also emerging models for studies of the evolution of genetic systems, endosymbiosis and plant-insect interactions. ScaleNet was launched in 1995 to provide insect identifiers, pest managers, insect systematists, evolutionary biologists and ecologists efficient access to information about scale insect biological diversity. It provides comprehensive information on scale insects taken directly from the primary literature. Currently, it draws from 23 477 articles and describes the systematics and biology of 8194 valid species. For 20 years, ScaleNet ran on the same software platform. That platform is no longer viable. Here, we present a new, open-source implementation of ScaleNet. We have normalized the data model, begun the process of correcting invalid data, upgraded the user interface, and added online administrative tools. These improvements make ScaleNet easier to use and maintain and make the ScaleNet data more accurate and extendable. Database URL:http://scalenet.info
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Affiliation(s)
| | - Barbara D Denno
- Systematic Entomology Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD, 20705
| | - Douglass R Miller
- Systematic Entomology Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD, 20705; Division of Plant Industry, Gainesville, FL, 32608-1201
| | - Gary L Miller
- Systematic Entomology Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD, 20705
| | - Yair Ben-Dov
- Agricultural Research Organization, Volcani Centre, Beit-Dagan, Israel
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, 36849
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22
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Abstract
The specificity of the interactions between plants and their consumers varies considerably. The evolutionary and ecological factors underlying this variation are unclear. Several potential explanatory factors vary with latitude, for example plant species richness and the intensity of herbivory. Here, we use comparative phylogenetic methods to test the effect of latitude on host range in scale insects. We find that, on average, scale insects that occur in lower latitudes are more polyphagous. This result is at odds with the general pattern of greater host-plant specificity of insects in the tropics. We propose that this disparity reflects a high cost for host specificity in scale insects, stemming from unusual aspects of scale insect life history, for example, passive wind-driven dispersal. More broadly, the strong evidence for pervasive effects of geography on host range across insect groups stands in stark contrast to the weak evidence for constraints on host range due to genetic trade-offs.
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Affiliation(s)
- Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL 36849, USA
| | - Daniel A Peterson
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, MA 01003, USA
| | - Benjamin B Normark
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, MA 01003, USA
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23
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Blackmon H, Hardy NB, Ross L. The evolutionary dynamics of haplodiploidy: Genome architecture and haploid viability. Evolution 2015; 69:2971-8. [PMID: 26462452 PMCID: PMC4989469 DOI: 10.1111/evo.12792] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/30/2015] [Accepted: 10/01/2015] [Indexed: 02/07/2023]
Abstract
Haplodiploid reproduction, in which males are haploid and females are diploid, is widespread among animals, yet we understand little about the forces responsible for its evolution. The current theory is that haplodiploidy has evolved through genetic conflicts, as it provides a transmission advantage to mothers. Male viability is thought to be a major limiting factor; diploid individuals tend to harbor many recessive lethal mutations. This theory predicts that the evolution of haplodiploidy is more likely in male heterogametic lineages with few chromosomes, as genes on the X chromosome are often expressed in a haploid environment, and the fewer the chromosome number, the greater the proportion of the total genome that is X-linked. We test this prediction with comparative phylogenetic analyses of mites, among which haplodiploidy has evolved repeatedly. We recover a negative correlation between chromosome number and haplodiploidy, find evidence that low chromosome number evolved prior to haplodiploidy, and that it is unlikely that diplodiploidy has reevolved from haplodiploid lineages of mites. These results are consistent with the predicted importance of haploid male viability.
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Affiliation(s)
- Heath Blackmon
- Department of Biology, University of Texas, Arlington, Box 19498, Arlington, Texas, 76019
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama, 36849
| | - Laura Ross
- School of Biological Sciences, Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom.
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24
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Hardy NB, Otto SP. Specialization and generalization in the diversification of phytophagous insects: tests of the musical chairs and oscillation hypotheses. Proc Biol Sci 2015; 281:rspb.2013.2960. [PMID: 25274368 DOI: 10.1098/rspb.2013.2960] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Evolutionary biologists have often assumed that ecological generalism comes at the expense of less intense exploitation of specific resources and that this trade-off will promote the evolution of ecologically specialized daughter species. Using a phylogenetic comparative approach with butterflies as a model system, we test hypotheses that incorporate changes in niche breadth and location into explanations of the taxonomic diversification of insect herbivores. Specifically, we compare the oscillation hypothesis, where speciation is driven by host-plant generalists giving rise to specialist daughter species, to the musical chairs hypothesis, where speciation is driven by host-plant switching, without changes in niche breadth. Contrary to the predictions of the oscillation hypothesis, we recover a negative relationship between host-plant breadth and diversification rate and find that changes in host breadth are seldom coupled to speciation events. By contrast, we present evidence for a positive relationship between rates of host switching and butterfly diversification, consonant with the musical chairs hypothesis. These results suggest that the costs of trophic generalism in plant-feeding insects may have been overvalued and that transitions from generalists to ecological specialists may not be an important driver of speciation in general.
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Affiliation(s)
- Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL 36849, USA
| | - Sarah P Otto
- Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4
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Peterson DA, Hardy NB, Morse GE, Stocks IC, Okusu A, Normark BB. Phylogenetic analysis reveals positive correlations between adaptations to diverse hosts in a group of pathogen-like herbivores. Evolution 2015; 69. [PMID: 26374400 DOI: 10.1111/evo.12772] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 09/09/2015] [Indexed: 02/04/2023]
Abstract
A jack of all trades can be master of none-this intuitive idea underlies most theoretical models of host-use evolution in plant-feeding insects, yet empirical support for trade-offs in performance on distinct host plants is weak. Trade-offs may influence the long-term evolution of host use while being difficult to detect in extant populations, but host-use evolution may also be driven by adaptations for generalism. Here we used host-use data from insect collection records to parameterize a phylogenetic model of host-use evolution in armored scale insects, a large family of plant-feeding insects with a simple, pathogen-like life history. We found that a model incorporating positive correlations between evolutionary changes in host performance best fit the observed patterns of diaspidid presence and absence on nearly all focal host taxa, suggesting that adaptations to particular hosts also enhance performance on other hosts. In contrast to the widely invoked trade-off model, we advocate a "toolbox" model of host-use evolution in which armored scale insects accumulate a set of independent genetic tools, each of which is under selection for a single function but may be useful on multiple hosts.
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Affiliation(s)
- Daniel A Peterson
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts.
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, Alabama
| | - Geoffrey E Morse
- Department of Biology, University of San Diego, San Diego, California
| | - Ian C Stocks
- Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Gainesville, Florida
| | - Akiko Okusu
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts
| | - Benjamin B Normark
- Department of Biology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts
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Cook LG, Hardy NB, Crisp MD. Three explanations for biodiversity hotspots: small range size, geographical overlap and time for species accumulation. An Australian case study. New Phytol 2015; 207:390-400. [PMID: 25442328 DOI: 10.1111/nph.13199] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 10/28/2014] [Indexed: 06/04/2023]
Abstract
To understand the generation and maintenance of biodiversity hotspots, we tested three major hypotheses: rates of diversification, ecological limits to diversity, and time for species accumulation. Using dated molecular phylogenies, measures of species' range size and geographical clade overlap, niche modelling, and lineages-through-time plots of Australian Fabaceae, we compared the southwest Australia Floristic Region (SWAFR; a global biodiversity hotspot) with a latitudinally equivalent non-hotspot, southeast Australia (SEA). Ranges of species (real and simulated) were smaller in the SWAFR than in SEA. Geographical overlap of clades was significantly greater for Daviesia in the SWAFR than in SEA, but the inverse for Bossiaea. Lineage diversification rates over the past 10 Myr did not differ between the SWAFR and SEA in either genus. Interaction of multiple factors probably explains the differences in measured diversity between the two regions. Steeper climatic gradients in the SWAFR probably explain the smaller geographical ranges of both genera there. Greater geographical overlap of clades in the SWAFR, combined with a longer time in the region, can explain why Daviesia is far more species-rich there than in SEA. Our results indicate that the time for speciation and ecological limits hypotheses, in concert, can explain the differences in biodiversity.
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Affiliation(s)
- Lyn G Cook
- School of Biological Sciences, The University of Queensland, Brisbane, Qld, 4072, Australia
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, 36849, USA
| | - Michael D Crisp
- Research School of Biology, The Australian National University, Canberra, ACT, 0200, Australia
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Hardy NB, Peterson DA, von Dohlen CD. The evolution of life cycle complexity in aphids: Ecological optimization or historical constraint? Evolution 2015; 69:1423-1432. [DOI: 10.1111/evo.12643] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 03/06/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Nate B. Hardy
- Department of Entomology and Plant Pathology; Auburn University; Auburn Alabama 36849
| | - Daniel A. Peterson
- Graduate Program in Organismic & Evolutionary Biology; University of Massachusetts; Amherst Massachusetts 01003
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Ross L, Blackmon H, Lorite P, Gokhman VE, Hardy NB. Recombination, chromosome number and eusociality in the Hymenoptera. J Evol Biol 2015; 28:105-16. [PMID: 25382409 PMCID: PMC4328152 DOI: 10.1111/jeb.12543] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 10/31/2014] [Accepted: 11/03/2014] [Indexed: 02/05/2023]
Abstract
Extraordinarily high rates of recombination have been observed in some eusocial species. The most popular explanation is that increased recombination increases genetic variation among workers, which in turn increases colony performance, for example by increasing parasite resistance. However, support for the generality of higher recombination rates among eusocial organisms remains weak, due to low sample size and a lack of phylogenetic independence of observations. Recombination rate, although difficult to measure directly, is correlated with chromosome number. As predicted, several authors have noted that chromosome numbers are higher among the eusocial species of Hymenoptera (ants, bees and wasps). Here, we present a formal comparative analysis of karyotype data from 1567 species of Hymenoptera. Contrary to earlier studies, we find no evidence for an absolute difference between chromosome number in eusocial and solitary species of Hymenoptera. However, we find support for an increased rate of chromosome number change in eusocial taxa. We show that among eusocial taxa colony size is able to explain some of the variation in chromosome number: intermediate-sized colonies have more chromosomes than those that are either very small or very large. However, we were unable to detect effects of a number of other colony characteristics predicted to affect recombination rate - including colony relatedness and caste number. Taken together, our results support the view that a eusocial lifestyle has led to variable selection pressure for increased recombination rates, but that identifying the factors contributing to this variable selection will require further theoretical and empirical effort.
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Affiliation(s)
- L Ross
- School of Biological Sciences, Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, UK
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Semple TL, Gullan PJ, Hodgson CJ, Hardy NB, Cook LG. Systematic review of the Australian ‘bush-coconut’ genus Cystococcus (Hemiptera: Eriococcidae) uncovers a new species from Queensland. INVERTEBR SYST 2015. [DOI: 10.1071/is14061] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Australia houses some unusual biota (insects included), much of which is undescribed. Cystococcus Fuller (Hemiptera : Sternorrhyncha : Coccoidea : Eriococcidae) currently comprises two species, both of which induce galls exclusively on bloodwoods (Myrtaceae: Corymbia Hill & Johnson). These insects display sexual dichronism, whereby females give birth first to sons and then to daughters. Wingless first-instar females cling to their winged adult brothers and are carried out of the maternal gall when the males fly to find mates – a behaviour called intersexual phoresy. Here, we use data from two gene regions, as well as morphology and host-use of the insects, to assess the status of a previously undescribed species. We describe this newly recognised species as Cystococcus campanidorsalis, sp. nov. Semple, Cook & Hodgson, redescribe the two existing species – C. echiniformis Fuller and C. pomiformis (Froggatt), designate a lectotype for C. echiniformis, and provide the first descriptions of adult males, and nymphal males and females for the genus. We have also reinterpreted a key morphological character of the adult females. This paper provides a foundation for further work on the genus, which is widespread across northern Australia and could prove to be useful for studies on biogeography and bloodwood ecosystems. urn:lsid:zoobank.org:pub:3A9DC645-0CBC-48B0-8BD3-5ACC0E2130D1
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Crisp MD, Hardy NB, Cook LG. Clock model makes a large difference to age estimates of long-stemmed clades with no internal calibration: a test using Australian grasstrees. BMC Evol Biol 2014; 14:263. [PMID: 25523814 PMCID: PMC4279595 DOI: 10.1186/s12862-014-0263-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 12/10/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Estimating divergence times in phylogenies using a molecular clock depends on accurate modeling of nucleotide substitution rates in DNA sequences. Rate heterogeneity among lineages is likely to affect estimates, especially in lineages with long stems and short crowns ("broom" clades) and no internal calibration. We evaluate the performance of the random local clocks model (RLC) and the more routinely employed uncorrelated lognormal relaxed clock model (UCLN) in situations in which a significant rate shift occurs on the stem branch of a broom clade. We compare the results of simulations to empirical results from analyses of a real rate-heterogeneous taxon - Australian grass trees (Xanthorrhoea) - whose substitution rate is slower than in its sister groups, as determined by relative rate tests. RESULTS In the simulated datasets, the RLC model performed much better than UCLN: RLC correctly estimated the age of the crown node of slow-rate broom clades, whereas UCLN estimates were consistently too young. Similarly, in the Xanthorrhoea dataset, UCLN returned significantly younger crown ages than RLC (mean estimates respectively 3-6 Ma versus 25-35 Ma). In both real and simulated datasets, Bayes Factor tests strongly favored the RLC model over the UCLN model. CONCLUSIONS The choice of an unsuitable molecular clock model can strongly bias divergence time estimates. In particular, for data predicted to have more rate variation among than within clades, dating with RLC is much more likely to be accurate than with UCLN. The choice of clocks should be informed by the biology of the study group (e.g., life-form) or assessed with relative rate tests and post-hoc model comparisons.
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Affiliation(s)
- Michael D Crisp
- Research School of Biology, The Australian National University, Acton, Canberra, ACT 2601, Australia.
| | - Nate B Hardy
- Department of Entomology and Plant Pathology, Auburn University, Auburn, AL, 36849, USA.
| | - Lyn G Cook
- The University of Queensland, School of Biological Sciences, Brisbane Qld, 4072, Australia.
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Gruwell ME, Hardy NB, Gullan PJ, Dittmar K. Evolutionary relationships among primary endosymbionts of the mealybug subfamily phenacoccinae (hemiptera: Coccoidea: Pseudococcidae). Appl Environ Microbiol 2010; 76:7521-5. [PMID: 20851962 PMCID: PMC2976180 DOI: 10.1128/aem.01354-10] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Accepted: 09/08/2010] [Indexed: 11/20/2022] Open
Abstract
Mealybugs (Coccoidea: Pseudococcidae) are sap-sucking plant parasites that harbor bacterial endosymbionts within specialized organs. Previous studies have identified two subfamilies, Pseudococcinae and Phenacoccinae, within mealybugs and determined the primary endosymbionts (P-endosymbionts) of the Pseudococcinae to be Betaproteobacteria ("Candidatus Tremblaya princeps") containing Gammaproteobacteria secondary symbionts. Here, the P-endosymbionts of phenacoccine mealybugs are characterized based on 16S rRNA from the bacteria of 20 species of phenacoccine mealybugs and four outgroup Puto species (Coccoidea: Putoidae) and aligned to more than 100 published 16S rRNA sequences from symbiotic and free-living bacteria. Phylogenetic analyses recovered three separate lineages of bacteria from the Phenacoccinae, and these are considered to be the P-endosymbionts of their respective mealybug hosts, with those from (i) the mealybug genus Rastrococcus belonging to the Bacteroidetes, (ii) the subterranean mealybugs, tribe Rhizoecini, also within Bacteroidetes, in a clade sister to cockroach endosymbionts (Blattabacterium), and (iii) the remaining Phenacoccinae within the Betaproteobacteria, forming a well-supported sister group to "Candidatus Tremblaya princeps." Names are proposed for two strongly supported lineages: "Candidatus Brownia rhizoecola" for P-endosymbionts of Rhizoecini and "Candidatus Tremblaya phenacola" for P-endosymbionts of Phenacoccinae excluding Rastrococcus and Rhizoecini. Rates of nucleotide substitution among lineages of Tremblaya were inferred to be significantly faster than those of free-living Betaproteobacteria. Analyses also recovered a clade of Gammaproteobacteria, sister to the P-endosymbiont lineage of aphids ("Candidatus Buchnera aphidicola"), containing the endosymbionts of Putoidae, the secondary endosymbionts of pseudococcine mealybugs, and the endosymbionts of several other insect groups.
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Hardy NB, Gullan PJ. Australian gall-inducing scale insects on Eucalyptus: revision of Opisthoscelis Schrader (Coccoidea, Eriococcidae) and descriptions of a new genus and nine new species. Zookeys 2010; 58:1-74. [PMID: 21594191 PMCID: PMC3088339 DOI: 10.3897/zookeys.58.507] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 08/20/2010] [Indexed: 11/12/2022] Open
Abstract
We revise the genus Opisthoscelis Schrader, and erect the genus Tanyscelisgen. n. with Opisthoscelis pisiformis Froggatt as its type species. Species of both genera induce sexually dimorphic galls on Eucalyptus (Myrtaceae) in Australia, with Opisthoscelis subrotunda Schrader also in Papua New Guinea. We synonymise the following taxa (junior synonym with senior synonym): Opisthoscelis fibularis Froggatt, syn. n. with Opisthoscelis spinosa Froggatt; Opisthoscelis recurva Froggatt, syn. n. with Opisthoscelis maculata Froggatt; Opisthoscelis globosa Froggatt, syn. n. (= Opisthoscelis ruebsaameni Lindinger) with Opisthoscelis convexa Froggatt; and Opisthoscelis mammularis Froggatt, syn. n. with Opisthoscelis verrucula Froggatt. We transfer seven Opisthoscelis species to Tanyscelis as Tanyscelis conica (Fuller), comb. n., Tanyscelis convexa (Froggatt), comb. n., Tanyscelis maculata (Froggatt), comb. n., Tanyscelis maskelli (Froggatt), comb. n., Tanyscelis pisiformis (Froggatt), comb. n., Tanyscelis spinosa (Froggatt), comb. n., and Tanyscelis verrucula (Froggatt), comb. n. We redescribe and illustrate the adult female of each named species of Opisthoscelis for which the type material is known, as well as the first-instar nymph of the type species of Opisthoscelis (Opisthoscelis subrotunda) and Tanyscelis (Opisthoscelis pisiformis). We describe four new species of Opisthoscelis: Opisthoscelis beardsleyi Hardy & Gullan, sp. n., Opisthoscelis thurgoona Hardy & Gullan, sp. n., Opisthoscelis tuberculataHardy & Gullan, sp. n., and Opisthoscelis ungulifinis Hardy & Gullan, sp. n., and five new species of Tanyscelis: Tanyscelis grallator Hardy & Gullan, sp. n., Tanuscelis megagibba Hardy & Gullan, sp. n., Tanyscelis mollicornuta Hardy & Gullan, sp. n., Tanyscelis tripocula Hardy & Gullan, sp. n., and Tanyscelis villosigibba Hardy & Gullan, sp. n. We designate lectotypes for Opisthoscelis convexa, Opisthoscelis fibularis, Opisthoscelis globosa Froggatt, Opisthoscelis maculata, Opisthoscelis mammularis, Opisthoscelis maskelli, Opisthoscelis pisiformis, Opisthoscelis recurva, Opisthoscelis serrata, Opisthoscelis spinosa, and Opisthoscelis verrucula. As a result of our taxonomic revision, Opisthoscelis has six species and Tanyscelis has 12 species. We describe the galls of females for all 18 species and galls of males for 10 species of Opisthoscelis and Tanyscelis, and provide photographs of the galls for most species. A key to the adult females of the species of both genera is included.
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Affiliation(s)
- Nate B. Hardy
- Entomology, Queensland Department of Employment, Economic Development and Innovation, 80 Meiers Road, Indooroopilly, Queensland 4068, Australia
| | - Penny J. Gullan
- Department of Entomology, University of California, One Shields Avenue, Davis, California 95616-8584, USA
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Abstract
Background The tree of life is significantly asymmetrical - a result of differential speciation and extinction - but general causes of such asymmetry are unclear. Differences in niche partitioning are thought to be one possible general explanation. Ecological specialization might lead to increases in diversification rate or, alternatively, specialization might limit the evolutionary potential of specialist lineages and increase their extinction risk. Here we compare the diversification rates of gall-inducing and non-galling insect lineages. Compared with other insect herbivores feeding on the same host plant, gall-inducing insects feed on plant tissue that is more nutritious and less defended, and they do so in a favorable microhabitat that may also provide some protection from natural enemies. We use sister-taxon comparisons to test whether gall-inducing lineages are more host-specific than non-galling lineages, and more or less diverse than non-gallers. We evaluate the significance of diversity bipartitions under Equal Rates Markov models, and use maximum likelihood model-fitting to test for shifts in diversification rates. Results We find that, although gall-inducing insect groups are more host-specific than their non-galling relatives, there is no general significant increase in diversification rate in gallers. However, gallers are found at both extremes - two gall-inducing lineages are exceptionally diverse (Euurina sawflies on Salicaceae and Apiomorpha scale insects on Eucalytpus), and one gall-inducing lineage is exceptionally species-poor (Maskellia armored scales on Eucalyptus). Conclusions The effect of ecological specialization on diversification rates is complex in the case of gall-inducing insects, but host range may be an important factor. When a gall-inducing lineage has a host range approximate to that of its non-galling sister, the gallers are more diverse. When the non-galler clade has a much wider host range than the galler, the non-galler is also much more diverse. There are also lineage-specific effects, with gallers on the same host group exhibiting very different diversities. No single general model explains the observed pattern.
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Affiliation(s)
- Nate B Hardy
- Queensland Primary Industries and Fisheries, Entomology, Brisbane, Queensland 4068, Australia.
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Hardy NB, Gullan PJ, Henderson RC, Cook LG. Relationships among felt scale insects (Hemiptera:Coccoidea:Eriococcidae) of southern beech, Nothofagus (Nothofagaceae), with the first descriptions of Australian species of the Nothofagus-feeding genus Madarococcus Hoy. INVERTEBR SYST 2008. [DOI: 10.1071/is07032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Species of southern beech (Nothofagus) have been studied extensively because of their importance in understanding southern hemisphere biogeography. Nothofagus species support a diverse assemblage of insect herbivores, including more than 30 described species of felt scales (Eriococcidae). We reconstructed the phylogeny of the Nothofagus-feeding felt scales with nucleotide sequence data and morphology. All but one of the exclusively Nothofagus-feeding species included in the analyses were recovered as a monophyletic group. This clade comprised the genera Chilechiton Hodgson & Miller, Chilecoccus Miller & González, Intecticoccus Kondo, Madarococcus Hoy (except for M. totorae Hoy), Sisyrococcus Hoy and several species of the genus Eriococcus Targioni Tozzetti. The genera Eriococcus and Madarococcus were not recovered as monophyletic. Here we revise Madarococcus. We expand the concept of the genus, provide a key to the adult females of the 31 species of Madarococcus and, for each named species, provide revised synonymies and any new collection or taxonomic information. We recognise the genus from Australia for the first time and describe the adult females of six new Australian species: Madarococcus cunninghamii Hardy & Gullan, sp. nov.; M. meander Hardy & Gullan, sp. nov.; M. megaventris Hardy & Gullan, sp. nov.; M. moorei Hardy & Gullan, sp. nov.; M. occultus Hardy & Gullan, sp. nov., and M. osculus Hardy & Gullan, sp. nov. We also describe the first-instar nymphs of M. cunninghamii, sp. nov., M. meander, sp. nov. and M. moorei, sp. nov. We transfer 17 species into Madarococcus from Eriococcus: M. argentifagi (Hoy), comb. nov.; M. cavellii (Maskell), comb. nov.; M. chilensis (Miller & González), comb. nov.; M. detectus (Hoy), comb. nov.; M. eurythrix (Miller & González), comb. nov.; M. fagicorticis (Maskell), comb. nov.; M. hispidus (Hoy), comb. nov.; M. latilobatus (Hoy), comb. nov.; M. maskelli, (Hoy), comb. nov.; M. montifagi (Hoy), comb. nov.; M. navarinoensis (Miller & González), comb. nov.; M. nelsonensis (Hoy), comb. nov.; M. nothofagi (Hoy), comb. nov.; M. podocarpi (Hoy), comb. nov.; M. raithbyi (Maskell), comb. nov.; M. rotundus (Hoy), comb. nov. and M. rubrifagi (Hoy), comb. nov. We transfer two species from Sisyrococcus into Madarococcus: M. intermedius (Maskell), comb. nov. and M. papillosus (Hoy), comb. nov. One species, M. totarae (Maskell), is excluded from Madarococcus, but cannot at present be placed in another genus and is listed as ‘M.’ totarae incertae sedis. We report the first collection of an eriococcid, M. osculus, sp. nov., on the deciduous beech, Nothofagus gunnii. With respect to biogeography, the results of our phylogenetic analysis are congruent with those obtained from recent analysis of Nothofagus; Australian and New Zealand species of Madarococcus form a monophyletic group to the exclusion of the South American species, suggesting that long-distance dispersal has played an important role in shaping the distributions of both the Nothofagus-feeding felt scales and their hosts.
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