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Boyd KS, Drummond F, Donahue C, Groden E. Factors Influencing the Population Fluctuations of Euproctis chrysorrhoea (Lepidoptera: Erebidae) in Maine. ENVIRONMENTAL ENTOMOLOGY 2021; 50:1203-1216. [PMID: 34175937 PMCID: PMC8506827 DOI: 10.1093/ee/nvab060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Indexed: 06/13/2023]
Abstract
The browntail moth (Euproctis chrysorrhoea (L.)) is a forest pest that was accidentally introduced in the late 1800's and spread throughout New England in the early part of the 20th Century. At its peak range expansion in 1915 it encompassed an area of 150,000 km2 after which populations declined. By the 1960s, its distribution had receded to relic populations on outer Cape Cod, MA, and islands in Casco Bay, ME. In 1989 browntail moth resurged in Maine, with periodic, moderate outbreaks before a dramatic increase of the population occurred in 2016. We examined the pattern of annual defoliation by browntail moth since its resurgence in the 1990s as well as variation in populations throughout infested areas in Maine during three years of the recent outbreak, 2016-2018, relative to differences in weather, parasitism and habitat characteristics. Levels of defoliation over 24 yr were predicted by the preceding spring precipitation (-, negative effect) and the year's previous late summer and early fall temperatures (+, positive effect) when first to third instar larvae feed and then construct winter hibernacula. Late summer temperatures predicted the abundance of hibernacula across outbreak areas (+). Early spring temperatures (+) and early and late spring precipitation (-) predicted early summer larval and pupal nest abundance. Warmer fall temperatures result in more mature populations coming out of winter hibernacula in the spring, whereas spring precipitation drives epizootic outbreaks of Entomophaga aulicae (Reichardt in Bail) Humber (Entomophthorales: Entomophthoraceae). with parasitoids playing a lesser role. Climate trends indicate continued increases in fall temperatures since browntail moth resurgence.
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Affiliation(s)
- Karla S Boyd
- School of Biology and Ecology, University of Maine, Orono, ME, USA
| | - Francis Drummond
- School of Biology and Ecology, University of Maine, Orono, ME, USA
| | - Charlene Donahue
- Maine Department of Agriculture, Conservation and Forestry, Maine Forest Service, Augusta, ME, USA
| | - Eleanor Groden
- School of Biology and Ecology, University of Maine, Orono, ME, USA
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Lacković N, Pernek M, Bertheau C, Franjević D, Stauffer C, Avtzis DN. Limited Genetic Structure of Gypsy Moth Populations Reflecting a Recent History in Europe. INSECTS 2018; 9:insects9040143. [PMID: 30340416 PMCID: PMC6315394 DOI: 10.3390/insects9040143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 10/14/2018] [Accepted: 10/17/2018] [Indexed: 11/19/2022]
Abstract
The gypsy moth, Lymantria dispar, a prominent polyphagous species native to Eurasia, causes severe impacts in deciduous forests during irregular periodical outbreaks. This study aimed to describe the genetic structure and diversity among European gypsy moth populations. Analysis of about 500 individuals using a partial region of the mitochondrial COI gene, L. dispar was characterized by low genetic diversity, limited population structure, and strong evidence that all extant haplogroups arose via a single Holocene population expansion event. Overall 60 haplotypes connected to a single parsimony network were detected and genetic diversity was highest for the coastal populations Croatia, Italy, and France, while lowest in continental populations. Phylogenetic reconstruction resulted in three groups that were geographically located in Central Europe, Dinaric Alps, and the Balkan Peninsula. In addition to recent events, the genetic structure reflects strong gene flow and the ability of gypsy moth to feed on about 400 deciduous and conifer species. Distinct genetic groups were detected in populations from Georgia. This remote population exhibited haplotypes intermediate to the European L. dispar dispar, Asian L. dispar asiatica, and L. dispar japonica clusters, highlighting this area as a possible hybridization zone of this species for future studies applying genomic approaches.
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Affiliation(s)
- Nikola Lacković
- Croatian Forest Research Institute, Cvjetno naselje 41, 10450 Jastrebarsko, Croatia.
| | - Milan Pernek
- Croatian Forest Research Institute, Cvjetno naselje 41, 10450 Jastrebarsko, Croatia.
| | - Coralie Bertheau
- UMR CNRS-UFC 6249 Chrono-Environment, Université de Franche Comte, 25200 Montbéliard, France.
| | - Damjan Franjević
- Faculty of Science, University of Zagreb, HR-10000 Zagreb, Croatia.
| | - Christian Stauffer
- Department of Forest and Soil Sciences, BOKU, University of Natural Resources and Life Sciences, A-1180 Vienna, Austria.
| | - Dimitrios N Avtzis
- Forest Research Institute, Hellenic Agricultural Organization Demeter, Vasilika, 57006 Thessaloniki, Greece.
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Malka O, Santos-Garcia D, Feldmesser E, Sharon E, Krause-Sakate R, Delatte H, van Brunschot S, Patel M, Visendi P, Mugerwa H, Seal S, Colvin J, Morin S. Species-complex diversification and host-plant associations in Bemisia tabaci: A plant-defence, detoxification perspective revealed by RNA-Seq analyses. Mol Ecol 2018; 27:4241-4256. [PMID: 30222226 PMCID: PMC6334513 DOI: 10.1111/mec.14865] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 08/30/2018] [Accepted: 09/04/2018] [Indexed: 12/22/2022]
Abstract
Insect–plant associations and their role in diversification are mostly studied in specialists. Here, we aimed to identify macroevolution patterns in the relationships between generalists and their host plants that have the potential to promote diversification. We focused on the Bemisia tabaci species complex containing more than 35 cryptic species. Mechanisms for explaining this impressive diversification have focused so far on allopatric forces that assume a common, broad, host range. We conducted a literature survey which indicated that species in the complex differ in their host range, with only few showing a truly broad one. We then selected six species, representing different phylogenetic groups and documented host ranges. We tested whether differences in the species expression profiles of detoxification genes are shaped more by their phylogenetic relationships or by their ability to successfully utilize multiple hosts, including novel ones. Performance assays divided the six species into two groups of three, one showing higher performance on various hosts than the other (the lower performance group). The same grouping pattern appeared when the species were clustered according to their expression profiles. Only species placed in the lower performance group showed a tendency to lower the expression of multiple genes. Taken together, these findings bring evidence for the existence of a common detoxification “machinery,” shared between species that can perform well on multiple hosts. We raise the possibility that this “machinery” might have played a passive role in the diversification of the complex, by allowing successful migration to new/novel environments, leading, in some cases, to fragmentation and speciation.
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Affiliation(s)
- Osnat Malka
- Department of Entomology, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Diego Santos-Garcia
- Department of Entomology, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Ester Feldmesser
- Department of Biological Services, Weizmann Institute of Science, Rehovot, Israel
| | - Elad Sharon
- Department of Entomology, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Renate Krause-Sakate
- Department of Plant Protection, School of Agriculture, São Paulo State University, Botucatu, Brazil
| | | | - Sharon van Brunschot
- Natural Resources Institute, University of Greenwich, Kent, UK.,School of Biological Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | | | - Paul Visendi
- Natural Resources Institute, University of Greenwich, Kent, UK
| | - Habibu Mugerwa
- Natural Resources Institute, University of Greenwich, Kent, UK
| | - Susan Seal
- Natural Resources Institute, University of Greenwich, Kent, UK
| | - John Colvin
- Natural Resources Institute, University of Greenwich, Kent, UK
| | - Shai Morin
- Department of Entomology, The Hebrew University of Jerusalem, Rehovot, Israel
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Wang H, Holloway JD, Janz N, Braga MP, Wahlberg N, Wang M, Nylin S. Polyphagy and diversification in tussock moths: Support for the oscillation hypothesis from extreme generalists. Ecol Evol 2017; 7:7975-7986. [PMID: 29043049 PMCID: PMC5632610 DOI: 10.1002/ece3.3350] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 06/16/2017] [Accepted: 07/23/2017] [Indexed: 01/06/2023] Open
Abstract
Theory on plasticity driving speciation, as applied to insect-plant interactions (the oscillation hypothesis), predicts more species in clades with higher diversity of host use, all else being equal. Previous support comes mainly from specialized herbivores such as butterflies, and plasticity theory suggests that there may be an upper host range limit where host diversity no longer promotes diversification. The tussock moths (Erebidae: Lymantriinae) are known for extreme levels of polyphagy. We demonstrate that this system is also very different from butterflies in terms of phylogenetic signal for polyphagy and for use of specific host orders. Yet we found support for the generality of the oscillation hypothesis, in that clades with higher diversity of host use were found to contain more species. These clades also consistently contained the most polyphagous single species. Comparing host use in Lymantriinae with related taxa shows that the taxon indeed stands out in terms of the frequency of polyphagous species. Comparative evidence suggests that this is most probably due to its nonfeeding adults, with polyphagy being part of a resulting life history syndrome. Our results indicate that even high levels of plasticity can drive diversification, at least when the levels oscillate over time.
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Affiliation(s)
- Houshuai Wang
- Department of EntomologySouth China Agricultural UniversityGuangzhouChina
| | | | - Niklas Janz
- Department of ZoologyStockholm UniversityStockholmSweden
| | | | - Niklas Wahlberg
- Department of BiologyLaboratory of GeneticsUniversity of TurkuTurkuFinland
- Department of BiologyLund UniversityLundSweden
| | - Min Wang
- Department of EntomologySouth China Agricultural UniversityGuangzhouChina
| | - Sören Nylin
- Department of ZoologyStockholm UniversityStockholmSweden
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Nakadai R. Species diversity of herbivorous insects: a brief review to bridge the gap between theories focusing on the generation and maintenance of diversity. Ecol Res 2017. [DOI: 10.1007/s11284-017-1500-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Yuan ML, Zhang QL, Wang ZF, Guo ZL, Bao GS. Molecular Phylogeny of Grassland Caterpillars (Lepidoptera: Lymantriinae: Gynaephora) Endemic to the Qinghai-Tibetan Plateau. PLoS One 2015; 10:e0127257. [PMID: 26053874 PMCID: PMC4459697 DOI: 10.1371/journal.pone.0127257] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Accepted: 04/14/2015] [Indexed: 11/19/2022] Open
Abstract
Gynaephora (Lepidoptera Erebidae: Lymantriinae) is a small genus, consisting of 15 nominated species, of which eight species are endemic to the Qinghai-Tibetan Plateau (QTP). In this study, we employed both mitochondrial and nuclear loci to infer a molecular phylogeny for the eight QTP Gynaephora spp. We used the phylogeny to estimate divergence dates in a molecular dating analysis and to delimit species. This information allowed us to investigate associations between the diversification history of the eight QTP species and geological and climatic events. Phylogenetic analyses indicated that the eight QTP species formed a monophyletic group with strong supports in both Bayesian and maximum likelihood analyses. The low K2P genetic distances between the eight QTP species suggested that diversification occurred relatively quickly and recently. Out of the eight species, five species were highly supported as monophyletic, which were also recovered by species delimitation analyses. Samples of the remaining three species (G. aureata, G. rouergensis, and G. minora) mixed together, suggesting that further studies using extensive population sampling and comprehensive morphological approaches are necessary to clarify their species status. Divergence time estimation results demonstrated that the diversification and speciation of Gynaephora on the QTP began during the late Miocene/early Pliocene and was potentially affected by the QTP uplift and associated climate changes during this time.
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Affiliation(s)
- Ming-Long Yuan
- State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou, Gansu, People's Republic of China
| | - Qi-Lin Zhang
- State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou, Gansu, People's Republic of China
| | - Zhao-Feng Wang
- State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou, Gansu, People's Republic of China
| | - Zhong-Long Guo
- State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou, Gansu, People's Republic of China
| | - Gen-Sheng Bao
- State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou, Gansu, People's Republic of China
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Antwi JB, Sword GA, Medina RF. Host-associated differentiation in a highly polyphagous, sexually reproducing insect herbivore. Ecol Evol 2015; 5:2533-43. [PMID: 26257868 PMCID: PMC4523351 DOI: 10.1002/ece3.1526] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Revised: 04/14/2015] [Accepted: 04/15/2015] [Indexed: 11/12/2022] Open
Abstract
Insect herbivores may undergo genetic divergence on their host plants through host-associated differentiation (HAD). Much of what we know about HAD involves insect species with narrow host ranges (i.e., specialists) that spend part or all their life cycle inside their hosts, and/or reproduce asexually (e.g., parthenogenetic insects), all of which are thought to facilitate HAD. However, sexually reproducing polyphagous insects can also exhibit HAD. Few sexually reproducing insects have been tested for HAD, and when they have insects from only a handful of potential host-plant populations have been tested, making it difficult to predict how common HAD is when one considers the entire species’ host range. This question is particularly relevant when considering insect pests, as host-associated populations may differ in traits relevant to their control. Here, we tested for HAD in a cotton (Gossypium hirsutum) pest, the cotton fleahopper (CFH) (Pseudatomoscelis seriatus), a sexually reproducing, highly polyphagous hemipteran insect. A previous study detected one incidence of HAD among three of its host plants. We used Amplified fragment length polymorphism (AFLP) markers to assess HAD in CFH collected from an expanded array of 13 host-plant species belonging to seven families. Overall, four genetically distinct populations were found. One genetically distinct genotype was exclusively associated with one of the host-plant species while the other three were observed across more than one host-plant species. The relatively low degree of HAD in CFH compared to the pea aphid, another hemipteran insect, stresses the likely importance of sexual recombination as a factor increasing the likelihood of HAD.
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Affiliation(s)
- Josephine B Antwi
- Department of Entomology, Texas A&M University College Station, Texas
| | - Gregory A Sword
- Department of Entomology, Texas A&M University College Station, Texas ; Faculty of Ecology and Evolutionary Biology, Texas A&M University College Station, Texas
| | - Raul F Medina
- Department of Entomology, Texas A&M University College Station, Texas ; Faculty of Ecology and Evolutionary Biology, Texas A&M University College Station, Texas
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Hamm CA, Fordyce JA. Patterns of host plant utilization and diversification in the brush-footed butterflies. Evolution 2015; 69:589-601. [PMID: 25546268 DOI: 10.1111/evo.12593] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 12/11/2014] [Indexed: 11/28/2022]
Abstract
Herbivorous insects represent one of the most successful animal radiations known. They occupy a wide range of niches, feed on a great variety of plants, and are species rich; yet the factors that influence their diversification are poorly understood. Host breadth is often cited as a major factor influencing diversification, and, according to the Oscillation Hypothesis, shifts from generalist to specialist feeding states increase the diversification rate for a clade. We explored the relationship between host breadth and diversification within the Nymphalidae (Lepidoptera) and explicitly tested predictions of the Oscillation Hypothesis. We found strong evidence of diversification rate heterogeneity, but no difference in host breadth between clades with a higher diversification rate compared to their sisters. We also found some clades exhibited phylogenetic nonindependence in host breadth and these clades had lower host plant turnover than expected by chance, suggesting host breadth is evolutionarily constrained. Finally, we found that transitions among host breadth categories varied, but the likelihood of reductions in host breadth was greater than that of increases. Our results indicate host breadth is decoupled from diversification rate within the Nymphalidae, and that constraints on diet breadth might play an important role in the evolution of herbivorous insects.
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Affiliation(s)
- Christopher A Hamm
- Department of Ecology and Evolutionary Biology, University of Kansas, 5032 Haworth Hall, 1200 Sunnyside Avenue, Lawrence, Kansas, 66045.
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