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Halassy M, Batáry P, Csecserits A, Török K, Valkó O. Meta-analysis identifies native priority as a mechanism that supports the restoration of invasion-resistant plant communities. Commun Biol 2023; 6:1100. [PMID: 37903920 PMCID: PMC10616274 DOI: 10.1038/s42003-023-05485-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 10/18/2023] [Indexed: 11/01/2023] Open
Abstract
The restoration of invasion-resistant plant communities is an important strategy to combat the negative impacts of alien invasions. Based on a systematic review and meta-analysis of seed-based ecological restoration experiments, here we demonstrate the potential of functional similarity, seeding density and priority effect in increasing invasion resistance. Our results indicate that native priority is the most promising mechanism to control invasion that can reduce the performance of invasive alien species by more than 50%. High-density seeding is effective in controlling invasive species, but threshold seeding rates may exist. Overall seeding functionally similar species do not have a significant effect. Generally, the impacts are more pronounced on perennial and grassy invaders and on the short-term. Our results suggest that biotic resistance can be best enhanced by the early introduction of native plant species during restoration. Seeding of a single species with high functional similarity to invasive alien species is unpromising, and instead, preference should be given to high-density multifunctional seed mixtures, possibly including native species favored by the priority effect. We highlight the need to integrate research across geographical regions, global invasive species and potential resistance mechanisms.
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Affiliation(s)
- Melinda Halassy
- National Laboratory for Health Security, Centre for Ecological Research, Budapest, Hungary.
- Institute of Ecology and Botany, Centre for Ecological Research, Vácrátót, Hungary.
| | - Péter Batáry
- National Laboratory for Health Security, Centre for Ecological Research, Budapest, Hungary
- 'Lendület' Landscape and Conservation Ecology Research Group, Institute of Ecology and Botany, Centre for Ecological Research, Vácrátót, Hungary
| | - Anikó Csecserits
- National Laboratory for Health Security, Centre for Ecological Research, Budapest, Hungary
- Institute of Ecology and Botany, Centre for Ecological Research, Vácrátót, Hungary
| | - Katalin Török
- Institute of Ecology and Botany, Centre for Ecological Research, Vácrátót, Hungary
| | - Orsolya Valkó
- National Laboratory for Health Security, Centre for Ecological Research, Budapest, Hungary
- 'Lendület' Seed Ecology Research Group, Institute of Ecology and Botany, Centre for Ecological Research, Vácrátót, Hungary
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2
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Clarke DA, McGeoch MA. Invasive alien insects represent a clear but variable threat to biodiversity. CURRENT RESEARCH IN INSECT SCIENCE 2023; 4:100065. [PMID: 37564301 PMCID: PMC10410178 DOI: 10.1016/j.cris.2023.100065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 07/13/2023] [Accepted: 07/13/2023] [Indexed: 08/12/2023]
Abstract
Invasive alien insects are an important yet understudied component of the general threat that biological invasions pose to biodiversity. We quantified the breadth and level of this threat by performing environmental impact assessments using a modified version of the Environmental Impact Assessment for Alien Taxa (EICAT) framework. This represents the largest effort to date on quantify the environmental impacts of invasive alien insects. Using a relatively large and taxonomically representative set of insect species that have established non-native populations around the globe, we tested hypotheses on: (1) socioeconomic and (2) taxonomic biases, (3) relationship between range size and impact severity and (4) island susceptibility. Socioeconomic pests had marginally more environmental impact information than non-pests and, as expected, impact information was geographically and taxonomically skewed. Species with larger introduced ranges were more likely, on average, to have the most severe local environmental impacts (i.e. a global maximum impact severity of 'Major'). The island susceptibility hypothesis found no support, and both island and mainland systems experience similar numbers of high severity impacts. These results demonstrate the high variability, both within and across species, in the ways and extents to which invasive insects impact biodiversity, even within the highest profile invaders. However, the environmental impact knowledge base requires greater taxonomic and geographic coverage, so that hypotheses about invasion impact can be developed towards identifying generalities in the biogeography of invasion impacts.
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Affiliation(s)
- David A. Clarke
- Department of Environment and Genetics, La Trobe University, Victoria 3086, Australia
- Securing Antarctica's Environmental Future, La Trobe University, Victoria 3086, Australia
| | - Melodie A. McGeoch
- Department of Environment and Genetics, La Trobe University, Victoria 3086, Australia
- Securing Antarctica's Environmental Future, La Trobe University, Victoria 3086, Australia
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3
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da Cunha TG, Veloso RVDS, de Araújo MMM, Tavares LG, Ribeiro LFB, Tormen GP, Campos DS, Picanço MC, Lopes EA, Pereira RR, Soares MA, da Silva RS. Distribution of Dalbulus maidis (DeLong) (Hemiptera: Cicadellidae) and incidence of maize rayado fino virus and Candidatus Phytoplasma asteris in corn succession planting systems. PEST MANAGEMENT SCIENCE 2023; 79:2325-2337. [PMID: 36799295 DOI: 10.1002/ps.7408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 02/07/2023] [Accepted: 02/17/2023] [Indexed: 06/02/2023]
Abstract
BACKGROUND Corn is one of the main crops grown globally to produce food for human consumption and animal feed, including raw materials for bioenergy. Effective pest management is critical for the economic viability of corn production. The leafhopper Dalbulus maidis and the diseases transmitted by it have become relevant to corn production. Our study aimed to determine environmental parameters that affect D. maidis populations and the impacts of pathogen dispersion on corn productivity under different rotation systems and sowing seasons. RESULTS The population density of leafhoppers found in the studied crops was low but capable of establishing the diseases and spreading them widely in the crops. The leafhopper's highest occurrence was in the corn vegetative development stage, and its population peaks were earlier in the corn off-season. The incidence of maize rayado fino virus and maize bushy stunt phytoplasma were higher in corn off-season than in the growing season. The incidence of diseases was higher in the final stages of the cultivation cycle. Yield losses were significantly higher for maize bushy stunt phytoplasma and not significant for maize rayado fino virus. CONCLUSION Our study observed that corn's physiological stage was the main factor influencing D. maidis dynamics. The occurrence of D. maidis at low densities was sufficient to ensure the efficient transmission and dissemination of maize rayado fino virus and maize bushy stunt phytoplasma, which had a higher incidence in the reproductive stage and the corn sowed off-season. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Tiago Garcia da Cunha
- Fazenda Varginha, Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, Rodovia Bambuí/Medeiros, Bambuí, Minas Gerais, Brazil
- Departamento de Agronomia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | | | - Matheus Miller Mesquita de Araújo
- Fazenda Varginha, Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, Rodovia Bambuí/Medeiros, Bambuí, Minas Gerais, Brazil
| | - Luciano Gabriel Tavares
- Fazenda Varginha, Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, Rodovia Bambuí/Medeiros, Bambuí, Minas Gerais, Brazil
| | - Luiz Fernando Borges Ribeiro
- Fazenda Varginha, Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, Rodovia Bambuí/Medeiros, Bambuí, Minas Gerais, Brazil
| | - Gislaine Pacheco Tormen
- Fazenda Varginha, Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, Rodovia Bambuí/Medeiros, Bambuí, Minas Gerais, Brazil
- Departamento de Agronomia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Diogo Santos Campos
- Fazenda Varginha, Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, Rodovia Bambuí/Medeiros, Bambuí, Minas Gerais, Brazil
| | | | | | | | - Marcus Alvarenga Soares
- Departamento de Agronomia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Ricardo Siqueira da Silva
- Departamento de Agronomia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
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4
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Bonnamour A, Blake RE, Liebhold AM, Nahrung HF, Roques A, Turner RM, Yamanaka T, Bertelsmeier C. Historical plant introductions predict current insect invasions. Proc Natl Acad Sci U S A 2023; 120:e2221826120. [PMID: 37276425 PMCID: PMC10268304 DOI: 10.1073/pnas.2221826120] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 04/20/2023] [Indexed: 06/07/2023] Open
Abstract
Thousands of insect species have been introduced outside of their native ranges, and some of them strongly impact ecosystems and human societies. Because a large fraction of insects feed on or are associated with plants, nonnative plants provide habitat and resources for invading insects, thereby facilitating their establishment. Furthermore, plant imports represent one of the main pathways for accidental nonnative insect introductions. Here, we tested the hypothesis that plant invasions precede and promote insect invasions. We found that geographical variation in current nonnative insect flows was best explained by nonnative plant flows dating back to 1900 rather than by more recent plant flows. Interestingly, nonnative plant flows were a better predictor of insect invasions than potentially confounding socioeconomic variables. Based on the observed time lag between plant and insect invasions, we estimated that the global insect invasion debt consists of 3,442 region-level introductions, representing a potential increase of 35% of insect invasions. This debt was most important in the Afrotropics, the Neotropics, and Indomalaya, where we expect a 10 to 20-fold increase in discoveries of new nonnative insect species. Overall, our results highlight the strong link between plant and insect invasions and show that limiting the spread of nonnative plants might be key to preventing future invasions of both plants and insects.
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Affiliation(s)
- Aymeric Bonnamour
- Department of Ecology and Evolution, University of Lausanne, 1015Lausanne, Switzerland
| | | | - Andrew M. Liebhold
- Northern Research Station, Forest Service, US Department of Agriculture, Morgantown, WV26505
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 16500Prague, Czech Republic
| | - Helen F. Nahrung
- Forest Industries Research Centre, University of the Sunshine Coast, Buderim, QLD4556, Australia
| | - Alain Roques
- Institut National de la Recherche Agronomique, UR 0633, Zoologie Forestière, 4575Orléans, France
| | - Rebecca M. Turner
- Scion (New Zealand Forest Research Institute), Christchurch8440, New Zealand
| | - Takehiko Yamanaka
- Research Center for Agricultural Information Technology, National Agriculture and Food Research Organization, 305-8517Tsukuba, Japan
| | - Cleo Bertelsmeier
- Department of Ecology and Evolution, University of Lausanne, 1015Lausanne, Switzerland
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5
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Shan Y, Gao X, Hu X, Hou Y, Wang F. Current and future potential distribution of the invasive scale Ceroplastes rusci (L., 1758) (Hemiptera: Coccidae) under climate niche. PEST MANAGEMENT SCIENCE 2023; 79:1184-1192. [PMID: 36394192 DOI: 10.1002/ps.7290] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 11/01/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND The fig wax scale, Ceroplastes rusci is an invasive pest that feeds on more than 94 genera from 52 families that is spread across 60 countries, causing negative impacts to agriculture and forestry. Understanding the potential distribution of invasive species under climate change is crucial for the management and monitoring purposes. Thus, we predicted the potential distribution areas of C. rusci using Maximum Entropy (MaxEnt) based on the occurrence data and environmental variables under current and future climatic scenarios. RESULTS Our results showed that the temperature annual range (Bio 7) and mean temperature of the warmest quarter (Bio 10) attributed to a higher contribution to the current model of the distribution of C. rusci. The potential distribution maps illustrated the main concentrated areas of C. rusci which included South America, Africa, Asia, and Oceania. In addition, potential range expansions or reductions were predicted under different future climate change scenarios, which showed that the total suitable areas of the fig wax scale presented an increasing trend until 2100. CONCLUSION Our study provides significant data to understand the potential distribution of C. rusci around the world. It also serves as an early warning for the highly suitable habitat areas that even offers a platform to the currently non-infested regions or countries who are yet to develop monitoring strategies in response to the possible C. rusci outbreak. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Yiman Shan
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation center for Eco-Environment, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei, China
| | - Xinyue Gao
- College of Plant Protection, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Xinyu Hu
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation center for Eco-Environment, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei, China
| | - Yunfeng Hou
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation center for Eco-Environment, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei, China
| | - Fang Wang
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation center for Eco-Environment, Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei, China
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6
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López DN, Fuentes-Contreras E, Ruiz C, Ide S, Estay SA. A bug’s tale: revealing the history, biogeography and ecological patterns of 500 years of insect invasions. NEOBIOTA 2023. [DOI: 10.3897/neobiota.81.87362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The arrival of Europeans to the Americas triggered a massive exchange of organisms on a continental scale. This exchange was accelerated by the rapid increase in the movement of people and goods during the 20th century. In Chile, scientific and technical literature contains hundreds of records of non-native insect species established in different parts of the territory, from the hyperarid Atacama Desert to the Magallanes Region. Here, we analyse temporal trends, taxonomic diversity, biogeographic origin and main impacts of these species on different sectors in Chile from the European arrival to the present. Our task includes a review of old records in museum catalogues, libraries, collections, expedition records and catalogues. Almost 600 species of non-native insects have been reported to be established in Chile. Introductions started with the very arrival of Europeans to the central valley of Chile and underwent a huge acceleration in the second half of the 20th century. The order Hemiptera was the most prevalent amongst non-native insects. Most species are linked to agriculture and forestry. Species are of Palearctic origin in more than 50% of the records. In terms of temporal trends, the rate of established non-native species shows an abrupt increase at the beginning of the 1950s. This change may be associated with the strong development in agriculture and forestry in Chile after World War II and the increase in intercontinental air traffic. We believe that the understanding of past patterns of introductions is an important component in the design of current policies to minimise the impact of invasive insects.
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7
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Huron NA, Behm JE, Helmus MR. Paninvasion severity assessment of a U.S. grape pest to disrupt the global wine market. Commun Biol 2022; 5:655. [PMID: 35788172 PMCID: PMC9253006 DOI: 10.1038/s42003-022-03580-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 06/10/2022] [Indexed: 11/09/2022] Open
Abstract
Economic impacts from plant pests are often felt at the regional scale, yet some impacts expand to the global scale through the alignment of a pest’s invasion potentials. Such globally invasive species (i.e., paninvasives) are like the human pathogens that cause pandemics. Like pandemics, assessing paninvasion risk for an emerging regional pest is key for stakeholders to take early actions that avoid market disruption. Here, we develop the paninvasion severity assessment framework and use it to assess a rapidly spreading regional U.S. grape pest, the spotted lanternfly planthopper (Lycorma delicatula; SLF), to spread and disrupt the global wine market. We found that SLF invasion potentials are aligned globally because important viticultural regions with suitable environments for SLF establishment also heavily trade with invaded U.S. states. If the U.S. acts as an invasive bridgehead, Italy, France, Spain, and other important wine exporters are likely to experience the next SLF introductions. Risk to the global wine market is high unless stakeholders work to reduce SLF invasion potentials in the U.S. and globally. The spotted lanternfly planthopper poses a global threat as a paninvasive wine grape pest.
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Affiliation(s)
- Nicholas A Huron
- Integrative Ecology Lab, Department of Biology, Temple University, Philadelphia, PA, 19122, USA.
| | - Jocelyn E Behm
- Integrative Ecology Lab, Department of Biology, Temple University, Philadelphia, PA, 19122, USA
| | - Matthew R Helmus
- Integrative Ecology Lab, Department of Biology, Temple University, Philadelphia, PA, 19122, USA
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8
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Mally R, Ward SF, Trombik J, Buszko J, Medzihorský V, Liebhold AM. Non-native plant drives the spatial dynamics of its herbivores: the case of black locust (Robinia pseudoacacia) in Europe. NEOBIOTA 2021. [DOI: 10.3897/neobiota.69.71949] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Non-native plants typically benefit from enemy release following their naturalization in non-native habitats. However, over time, herbivorous insects specializing on such plants may invade from the native range and thereby diminish the benefits of enemy release that these plants may experience. In this study, we compare rates of invasion spread across Europe of three North American insect folivores: the Lepidoptera leaf miners Macrosaccus robiniella and Parectopa robiniella, and the gall midge Obolodiplosis robiniae, that specialize on Robinia pseudoacacia. This tree species is one of the most widespread non-native trees in Europe. We find that spread rates vary among the three species and that some of this variation can be explained by differences in their life history traits. We also report that geographical variation in spread rates are influenced by distribution of Robinia pseudoacacia, human population and temperature, though Robinia pseudoacacia occurrence had the greatest influence. The importance of host tree occurrence on invasion speed can be explained by the general importance of hosts on the population growth and spread of invading species.
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9
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Gougherty AV, Davies TJ. Host phylogenetic diversity predicts the global extent and composition of tree pests. Ecol Lett 2021; 25:101-112. [PMID: 34719086 DOI: 10.1111/ele.13908] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/10/2021] [Accepted: 09/15/2021] [Indexed: 10/19/2022]
Abstract
Tree pests cause billions of dollars of damage annually; yet, we know little about what limits their regional composition and distribution. Here, we model the co-occurrence of 4510 pests and 981 tree host genera spread across 233 countries. We show the composition of tree pests is primarily driven by the phylogenetic composition of host trees, whereas effects of climate and geography tend to be more minor. Pests that utilise many hosts tend to be more widespread; however, most pests do not fill the geographic range of their hosts-indicating that many pests could expand their extents if able to overcome barriers limiting their current distribution. Our results suggest that the establishment of pests in new regions may be largely dictated by the presence of suitable host trees, but more work is needed to fully understand the influences climate has on the distributions of individual pest species.
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Affiliation(s)
- Andrew V Gougherty
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada
| | - T Jonathan Davies
- Department of Botany, University of British Columbia, Vancouver, British Columbia, Canada.,Department of Forest & Conservation Sciences, University of British Columbia, Vancouver, British Columbia, Canada
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MacLachlan MJ, Liebhold AM, Yamanaka T, Springborn MR. Hidden patterns of insect establishment risk revealed from two centuries of alien species discoveries. SCIENCE ADVANCES 2021; 7:eabj1012. [PMID: 34705509 PMCID: PMC8550319 DOI: 10.1126/sciadv.abj1012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 09/03/2021] [Indexed: 06/13/2023]
Abstract
Understanding the socioeconomic drivers of biological invasion informs policy development for curtailing future invasions. While early 20th-century plant trade expansions preceded increased establishments of plant pests in Northern America, increased establishments did not follow accelerating imports later that century. To explore this puzzle, we estimate the historical establishment of plant-feeding Hemiptera in Northern America as a function of historical U.S. imports of live plants from seven world regions. Delays between establishment and discovery are modeled using a previously unused proxy for dynamic discovery effort. By recovering the timing of pest arrivals from their historical discoveries, we disentangle the joint establishment-discovery process. We estimate long delays to discovery, which are partially attributable to the low detectability of less economically important insect species. We estimate that many introduced species remain undiscovered, ranging from around one-fifth for Eurasian regions to two-fifths for Central and South America.
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Affiliation(s)
| | - Andrew M. Liebhold
- U.S. Department of Agriculture Forest Service, Northern Research Station, Morgantown, WV 26505, USA
- Forestry and Wood Sciences, Czech University of Life Sciences Prague, Praha 6 - Suchdol, Czech Republic
| | - Takehiko Yamanaka
- Institute for Agro-Environmental Sciences, NARO (NIAES), Tsukuba, Japan
| | - Michael R. Springborn
- Environmental Science and Policy, University of California, Davis, Davis, CA 95616, USA
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11
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Liebhold AM, Turner RM, Blake RE, Bertelsmeier C, Brockerhoff EG, Nahrung HF, Pureswaran DS, Roques A, Seebens H, Yamanaka T. Invasion disharmony in the global biogeography of native and non‐native beetle species. DIVERS DISTRIB 2021. [DOI: 10.1111/ddi.13381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Andrew M. Liebhold
- USDA Forest Service Northern Research Station Morgantown WV USA
- Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Praha 6 – Suchdol Czech Republic
| | - Rebecca M. Turner
- Scion (New Zealand Forest Research Institute) Christchurch New Zealand
| | | | | | | | | | | | | | - Hanno Seebens
- Senckenberg Biodiversity and Climate Research Center Frankfurt Germany
| | - Takehiko Yamanaka
- Research Center for Agricultural Information TechnologyNational Agriculture and Food Research Organization Tsukuba Japan
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12
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Franić I, Eschen R, Allan E, Hartmann M, Schneider S, Prospero S. Drivers of richness and community composition of fungal endophytes of tree seeds. FEMS Microbiol Ecol 2021; 96:5894911. [PMID: 32815990 DOI: 10.1093/femsec/fiaa166] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 08/12/2020] [Indexed: 01/30/2023] Open
Abstract
Recent studies revealed a high diversity of fungal endophytes in traded tree seeds, including potential plant pathogens. The factors determining richness and composition of seed mycobiomes are poorly understood, but might be an important determinant for tree health. We assessed the relative impact of host identity, site, several site-specific environmental factors, and whether the host was sampled in its native or non-native distribution range, on the richness and composition of fungal seed endophytes of nine tree species across 15 sites in Europe and North America. Our results show that fungal richness was affected by host identity, but not by environmental variables or host distribution range. Fungal community composition was primarily driven by host identity, and to a lesser extent by environment. Around 25% of the 2147 amplicon sequence variants (ASVs) were generalists appearing on both continents and in both gymnosperms and angiosperms. Around 63% of the ASVs appeared in only gymnosperms or angiosperms, and 33% of the ASVs were associated with a single host species, while none were found in all tree species. Our results suggest that although seed trade might facilitate movements of fungi, their establishment and spread in the new environment might be limited by host availability.
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Affiliation(s)
- Iva Franić
- CABI, CH-2800 Delémont, Switzerland.,Institute of Plant Sciences, University of Bern, CH-3013 Bern, Switzerland.,Swiss Federal Institute for Forest, Snow and Landscape Research WSL, CH-8903 Birmensdorf, Switzerland
| | | | - Eric Allan
- Institute of Plant Sciences, University of Bern, CH-3013 Bern, Switzerland
| | - Martin Hartmann
- Institute of Agricultural Sciences, ETH Zürich, CH-8092 Zürich, Switzerland
| | - Salome Schneider
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, CH-8903 Birmensdorf, Switzerland
| | - Simone Prospero
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, CH-8903 Birmensdorf, Switzerland
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13
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Phylogenetic escape from pests reduces pesticides on some crop plants. Proc Natl Acad Sci U S A 2020; 117:26849-26853. [PMID: 33046649 DOI: 10.1073/pnas.2013751117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Pesticides are a ubiquitous component of conventional crop production but come with considerable economic and ecological costs. We tested the hypothesis that variation in pesticide use among crop species is a function of crop economics and the phylogenetic relationship of a crop to native plants because unrelated crops accrue fewer herbivores and pathogens. Comparative analyses of a dataset of 93 Californian crops showed that more valuable crops and crops with close relatives in the native plant flora received greater pesticide use, explaining roughly half of the variance in pesticide use among crops against pathogens and herbivores. Phylogenetic escape from arthropod and pathogen pests results in lower pesticides, suggesting that the introduced status of some crops can be leveraged to reduce pesticides.
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14
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Lantschner MV, Corley JC, Liebhold AM. Drivers of global Scolytinae invasion patterns. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2020; 30:e02103. [PMID: 32086977 DOI: 10.1002/eap.2103] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 01/08/2020] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
Biological invasions are affected by characteristics of invading species, strength of pathway connectivity among world regions and habitat characteristics of invaded regions. These factors may interact in complex ways to drive geographical variation in numbers of invasions among world regions. Understanding the role of these drivers provides information that is crucial to the development of effective biosecurity policies. Here we assemble for the first time a global database of historical invasions of Scolytinae species and explore factors explaining geographical variation in numbers of species invading different regions. This insect group includes several pest species with massive economic and ecological impacts and these beetles are known to be accidentally moved with wood packaging in global trade. Candidate explanatory characteristics included in this analysis are cumulative trade among world regions, size of source species pools, forest area, and climatic similarity of the invaded region with source regions. Species capable of sib-mating comprised the highest proportion on nonnative Scolytines, and these species colonized a higher number of regions than outbreeders. The size of source species pools offered little power in explaining variation in numbers of invasions among world regions nor did climate or forest area. In contrast, cumulative trade had a strong and consistent positive relationship with numbers of Scolytinae species moving from one region to another, and this effect was highest for bark beetles, followed by ambrosia beetles, and was low for seed and twig feeders. We conclude that global variation in Scolytine invasions is primarily driven by variation in trade levels among world regions. Results stress the importance of global trade as the primary driver of historical Scolytinae invasions and we anticipate other hitchhiking species would exhibit similar patterns. One implication of these results is that invasions between certain world regions may be historically low because of past low levels of trade but future economic shifts could result in large numbers of new invasions as a result of increased trade among previously isolated portions of the world. With changing global flow of goods among world regions, it is crucial that biosecurity efforts keep pace to minimize future invasions and their impacts.
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Affiliation(s)
- M Victoria Lantschner
- Grupo de Ecología de Poblaciones de Insectos, Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB), INTA - CONICET, Modesta Victoria 4450, Bariloche, Argentina
| | - Juan C Corley
- Grupo de Ecología de Poblaciones de Insectos, Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB), INTA - CONICET, Modesta Victoria 4450, Bariloche, Argentina
- Departamento de Ecología, CRUB Universidad Nacional del Comahue, Quintral 1250, Bariloche, Argentina
| | - Andrew M Liebhold
- Northern Research Station, USDA Forest Service, 180 Canfield Street, Morgantown, West Virginia, 26505, USA
- Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 165 00, Praha 6, Suchdol, Czech Republic
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15
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Pyšek P, Hulme PE, Simberloff D, Bacher S, Blackburn TM, Carlton JT, Dawson W, Essl F, Foxcroft LC, Genovesi P, Jeschke JM, Kühn I, Liebhold AM, Mandrak NE, Meyerson LA, Pauchard A, Pergl J, Roy HE, Seebens H, van Kleunen M, Vilà M, Wingfield MJ, Richardson DM. Scientists' warning on invasive alien species. Biol Rev Camb Philos Soc 2020; 95:1511-1534. [PMID: 32588508 PMCID: PMC7687187 DOI: 10.1111/brv.12627] [Citation(s) in RCA: 444] [Impact Index Per Article: 111.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 05/30/2020] [Accepted: 06/03/2020] [Indexed: 12/12/2022]
Abstract
Biological invasions are a global consequence of an increasingly connected world and the rise in human population size. The numbers of invasive alien species – the subset of alien species that spread widely in areas where they are not native, affecting the environment or human livelihoods – are increasing. Synergies with other global changes are exacerbating current invasions and facilitating new ones, thereby escalating the extent and impacts of invaders. Invasions have complex and often immense long‐term direct and indirect impacts. In many cases, such impacts become apparent or problematic only when invaders are well established and have large ranges. Invasive alien species break down biogeographic realms, affect native species richness and abundance, increase the risk of native species extinction, affect the genetic composition of native populations, change native animal behaviour, alter phylogenetic diversity across communities, and modify trophic networks. Many invasive alien species also change ecosystem functioning and the delivery of ecosystem services by altering nutrient and contaminant cycling, hydrology, habitat structure, and disturbance regimes. These biodiversity and ecosystem impacts are accelerating and will increase further in the future. Scientific evidence has identified policy strategies to reduce future invasions, but these strategies are often insufficiently implemented. For some nations, notably Australia and New Zealand, biosecurity has become a national priority. There have been long‐term successes, such as eradication of rats and cats on increasingly large islands and biological control of weeds across continental areas. However, in many countries, invasions receive little attention. Improved international cooperation is crucial to reduce the impacts of invasive alien species on biodiversity, ecosystem services, and human livelihoods. Countries can strengthen their biosecurity regulations to implement and enforce more effective management strategies that should also address other global changes that interact with invasions.
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Affiliation(s)
- Petr Pyšek
- Czech Academy of Sciences, Institute of Botany, Department of Invasion Ecology, Průhonice, CZ-252 43, Czech Republic.,Department of Ecology, Faculty of Science, Charles University, Viničná 7, Prague, CZ-128 44, Czech Republic.,Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland, 7602, South Africa
| | - Philip E Hulme
- Bio-Protection Research Centre, Lincoln University, Canterbury, New Zealand
| | - Dan Simberloff
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, U.S.A
| | - Sven Bacher
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Tim M Blackburn
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland, 7602, South Africa.,Centre for Biodiversity and Environment Research, Department of Genetics, Evolution, and Environment, University College London, London, WC1E 6BT, U.K.,Institute of Zoology, Zoological Society of London, Regent's Park, London, NW1 4RY, U.K
| | - James T Carlton
- Maritime Studies Program, Williams College - Mystic Seaport, 75 Greenmanville, Mystic, CT, 06355, U.S.A
| | - Wayne Dawson
- Department of Biosciences, Durham University, South Road, Durham, DH1 3LE, U.K
| | - Franz Essl
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland, 7602, South Africa.,Division of Conservation Biology, Vegetation and Landscape Ecology, Department of Botany and Biodiversity Research, University of Vienna, Vienna, Austria
| | - Llewellyn C Foxcroft
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland, 7602, South Africa.,Conservation Services, South African National Parks, Private Bag X402, Skukuza, 1350, South Africa
| | - Piero Genovesi
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland, 7602, South Africa.,ISPRA, Institute for Environmental Protection and Research and Chair IUCN SSC Invasive Species Specialist Group, Rome, Italy
| | - Jonathan M Jeschke
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Müggelseedamm 310, Berlin, 12587, Germany.,Institute of Biology, Freie Universität Berlin, Königin-Luise-Str. 1-3, Berlin, 14195, Germany.,Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Königin-Luise-Str. 2-4, Berlin, 14195, Germany
| | - Ingolf Kühn
- Department Community Ecology, Helmholtz Centre for Environmental Research - UFZ, Theodor-Lieser-Str. 4, Halle, 06120, Germany.,Geobotany & Botanical Garden, Martin Luther University Halle-Wittenberg, Am Kirchtor 1, Halle, 06108, Germany.,German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, Leipzig, 04103, Germany
| | - Andrew M Liebhold
- US Forest Service Northern Research Station, 180 Canfield St., Morgantown, West Virginia, U.S.A.,Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, CZ-165 00, Czech Republic
| | - Nicholas E Mandrak
- Department of Biological Sciences, University of Toronto, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Laura A Meyerson
- Department of Natural Resources Science, The University of Rhode Island, Kingston, Rhode Island, 02881, U.S.A
| | - Aníbal Pauchard
- Facultad de Ciencias Forestales, Universidad de Concepción, Concepción, Chile.,Institute of Ecology and Biodiversity, Santiago, Chile
| | - Jan Pergl
- Czech Academy of Sciences, Institute of Botany, Department of Invasion Ecology, Průhonice, CZ-252 43, Czech Republic
| | - Helen E Roy
- U.K. Centre for Ecology & Hydrology, Wallingford, OX10 8BB, U.K
| | - Hanno Seebens
- Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Senckenberganlage 25, Frankfurt am Main, 60325, Germany
| | - Mark van Kleunen
- Ecology, Department of Biology, University of Konstanz, Universitätsstrasse 10, Constance, 78457, Germany.,Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, 318000, China
| | - Montserrat Vilà
- Estación Biológica de Doñana (EBD-CSIC), Avd. Américo Vespucio 26, Isla de la Cartuja, Sevilla, 41092, Spain.,Department of Plant Biology and Ecology, University of Sevilla, Sevilla, Spain
| | - Michael J Wingfield
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, South Africa
| | - David M Richardson
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland, 7602, South Africa
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16
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Li HP, Wickham JD, Bushley K, Wang ZG, Zhang B, Sun JH. New Approaches in Urban Forestry to Minimize Invasive Species Impacts: The Case of Xiongan New Area in China. INSECTS 2020; 11:insects11050300. [PMID: 32408656 PMCID: PMC7290593 DOI: 10.3390/insects11050300] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 05/06/2020] [Accepted: 05/07/2020] [Indexed: 12/03/2022]
Abstract
China is implementing an extensive urban forestry plan in Xiongan New Area (XNA), a new city in Hebei province. The city has been designated to serve Beijing’s noncapital functions and promote the integration of the broader Beijing–Tianjin–Hebei city-region. As part of a green initiative to minimize environmental impacts and its carbon footprint, a massive urban forestry system has been planned on an unprecedented scale, expected to cover over 600 km2 by 2030. Using science to inform policy, one major goal is to simultaneously minimize impacts of invasive species, while making urban forests more resilient to potential invasive species threats. In this review, we introduce these urban forestry plans such as basic concepts and principles for afforestation, tree species to be planted, delineation of existing pests already established, and expected forest invasive species of concern threatening the new area. Finally, we introduce a framework for invasive pest management strategies in XNA based on a “big data” approach and decision system to minimize impacts of invasive species. This new approach to urban forestry has the potential to become an exemplary global model for urban forestry planning, one that integrates research activities focused on forest health surveys and monitoring with sustainable forestry management. Finally, we provide an overview of the forest health policy required for the design of an unprecedentedly large new urban forest from initial planning to full implementation of an integrated forest management program.
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Affiliation(s)
- Hui-Ping Li
- Key Laboratory of Forest Germplasm Resources and Forest Protection of Hebei Province, Forestry College of Hebei Agricultural University, Baoding 071000, China; (H.-P.L.); (Z.-G.W.)
| | - Jacob D. Wickham
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; (J.D.W.); (J.-H.S.)
| | - Kathryn Bushley
- Department of Plant Biology, University of Minnesota, Saint Paul, MN 55108, USA;
| | - Zhi-Gang Wang
- Key Laboratory of Forest Germplasm Resources and Forest Protection of Hebei Province, Forestry College of Hebei Agricultural University, Baoding 071000, China; (H.-P.L.); (Z.-G.W.)
| | - Bin Zhang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; (J.D.W.); (J.-H.S.)
- Correspondence: ; Tel.: +86-10-64807071
| | - Jiang-Hua Sun
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China; (J.D.W.); (J.-H.S.)
- CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 10049, China
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17
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Wei J, Peng L, He Z, Lu Y, Wang F. Potential distribution of two invasive pineapple pests under climate change. PEST MANAGEMENT SCIENCE 2020; 76:1652-1663. [PMID: 31724310 DOI: 10.1002/ps.5684] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 10/18/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND The number of global invasive species has significantly increased during the past two centuries due to globalization. The understanding of species invasion under climate change is crucial for sustainable biodiversity conservation, community dynamics, ecosystem function, and resource distribution. Two invasive species, Dysmicoccus brevipes (Cockerell) and D. neobrevipes (Beardsley) have greatly expanded their ranges during recent years. These insects are now considered as extremely serious pests for various plants, especially pineapple. In addition, they are the primary vectors for pineapple wilt associated virus. However, the potential distribution range and management strategies for these pests are unclear. RESULTS In this study, potential risk maps were developed for these pests with MaxEnt (maximum entropy) based on occurrence data under different environmental variables. The potential distributions of these pests were projected for 2050s and 2070s under three climate change scenarios as described in the Special Report on Emissions Scenarios of the Intergovernmental Panel on Climate Change. Results showed that both pests have similar potential distributions, with high environmental suitability in South America, Africa and South Asia. In addition, potential range expansions or reductions were predicted under different climate change scenarios. The annual mean temperature was the most important factor, accounting for 43.4% of D. brevipes distribution. The minimum temperature of coldest month and mean temperature of coldest quarter was found to be responsible for 90.3% of D. neobrevipes distribution. CONCLUSION This research provided a theoretical reference framework to develop policies in the management and control of these invasive pests. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Jiufeng Wei
- Department of Entomology, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Lingfei Peng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Biological Control Research Institute, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhiqiang He
- College of Plant Science, Tarim University, Alar, China
| | - Yunyun Lu
- Department of Entomology, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Fang Wang
- Hebei Key Laboratory of Animal Physiology, Biochemistry and Molecular Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
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18
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Branco M, Nunes P, Roques A, Fernandes MR, Orazio C, Jactel H. Urban trees facilitate the establishment of non-native forest insects. NEOBIOTA 2019. [DOI: 10.3897/neobiota.52.36358] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Cities, due to the presence of ports and airports and the high diversity of trees in streets, parks, and gardens, may play an important role for the introduction of invasive forest pests. We hypothesize that areas of urban forest facilitate the establishment of non-native forest pests. Based on scientific literature and a pan-European database on non-native species feeding on woody plants, we analysed where the first detections occurred in European countries. We collected site data for 137 first detections in Europe and 508 first European country-specific records. We also estimated the percentage of tree cover and suitable habitat (green areas with trees) in buffers around detection points. The large majority of first records (89% for first record in Europe and 88% for first records in a European country) were found in cities or suburban areas. Only 7% of the cases were in forests far from cities. The probability of occurrence decreased sharply with distance from the city. The probability to be detected in urban areas was higher for sap feeders, gall makers, and seed or fruit feeders (>90%) than for bark and wood borers (81%). Detection sites in cities were highly diverse, including public parks, street trees, university campus, arboreta, zoos, and botanical gardens. The average proportion of suitable habitat was less than 10% in urban areas where the species were detected. Further, more than 72% of the cases occurred in sites with less than 20% of tree cover. Hotspots of first detection were identified along the coastal regions of the Mediterranean and Atlantic, and near industrial areas of central Europe. We conclude that urban trees are main facilitators for the establishment of non-native forest pests, and that cities should thus be intensely surveyed. Moreover, as urban areas are highly populated, the involvement of citizens is highly recommended.
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19
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Franić I, Prospero S, Hartmann M, Allan E, Auger-Rozenberg MA, Grünwald NJ, Kenis M, Roques A, Schneider S, Sniezko R, Williams W, Eschen R. Are traded forest tree seeds a potential source of nonnative pests? ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2019; 29:e01971. [PMID: 31302945 DOI: 10.1002/eap.1971] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 06/04/2019] [Accepted: 06/14/2019] [Indexed: 06/10/2023]
Abstract
The international seed trade is considered relatively safe from a phytosanitary point of view and is therefore less regulated than trade in other plants for planting. However, the pests carried by traded seeds are not well known. We assessed insects and fungi in 58 traded seed lots of 11 gymnosperm and angiosperm tree species from North America, Europe, and Asia. Insects were detected by X-raying and molecular methods. The fungal community was characterized using high-throughput sequencing (HTS) and by growing fungi on non-selective agar. About 30% of the seed lots contained insect larvae. Gymnosperms contained mostly hymenopteran (Megastigmus spp.) and dipteran (Cecidomyiidae) larvae, while angiosperms contained lepidopteran (Cydia latiferreana) and coleopteran (Curculio spp.) larvae. HTS indicated the presence of fungi in all seed lots and fungi grew on non-selective agar from 96% of the seed lots. Fungal abundance and diversity were much higher than insect diversity and abundance, especially in angiosperm seeds. Almost 50% of all fungal exact sequence variants (ESVs) found in angiosperms were potential pathogens, in comparison with around 30% of potentially pathogenic ESVs found in gymnosperms. The results of this study indicate that seeds may pose a greater risk of pest introduction than previously believed or accounted for. A rapid risk assessment suggests that only a small number of species identified in this study is of phytosanitary concern. However, more research is needed to enable better risk assessment, especially to increase knowledge about the potential for transmission of fungi to seedlings and the host range and impact of identified species.
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Affiliation(s)
- Iva Franić
- CABI, Delémont, Switzerland
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - Simone Prospero
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
| | - Martin Hartmann
- Institute of Agricultural Sciences, ETH Zürich, Zürich, Switzerland
| | - Eric Allan
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | | | | | | | | | - Salome Schneider
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
| | - Richard Sniezko
- Dorena Genetic Resource Center, USDA Forest Service, Cottage Grove, Oregon , 97424, USA
| | - Wyatt Williams
- Private Forests Division, Oregon Department of Forestry, Salem, Oregon, 97310, USA
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20
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Guyot V, Jactel H, Imbaud B, Burnel L, Castagneyrol B, Heinz W, Deconchat M, Vialatte A. Tree diversity drives associational resistance to herbivory at both forest edge and interior. Ecol Evol 2019; 9:9040-9051. [PMID: 31463002 PMCID: PMC6706233 DOI: 10.1002/ece3.5450] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 06/11/2019] [Accepted: 06/14/2019] [Indexed: 11/12/2022] Open
Abstract
Tree diversity is increasingly acknowledged as an important driver of insect herbivory. However, there is still a debate about the direction of associational effects that can range from associational resistance (i.e., less damage in mixed stands than in monocultures) to the opposite, associational susceptibility. Discrepancies among published studies may be due to the overlooked effect of spatially dependent processes such as tree location within forests. We addressed this issue by measuring crown defoliation and leaf damage made by different guilds of insect herbivores on oaks growing among conspecific versus heterospecific neighbors at forest edges versus interior, in two closed sites in SW France forests. Overall, oaks were significantly less defoliated among heterospecific neighbors (i.e., associational resistance), at both forest edge and interior. At the leaf level, guild diversity and leaf miner herbivory significantly increased with tree diversity regardless of oak location within stands. Other guilds showed no clear response to tree diversity or oak location. We showed that herbivore response to tree diversity varied among insect feeding guilds but not between forest edges and interior, with inconsistent patterns between sites. Importantly, we show that oaks were more defoliated in pure oak plots than in mixed plots at both edge and forest interior and that, on average, defoliation decreased with increasing tree diversity from one to seven species. We conclude that edge conditions could be interacting with tree diversity to regulate insect defoliation, but future investigations are needed to integrate them into the management of temperate forests, notably by better understanding the role of the landscape context.
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Affiliation(s)
- Virginie Guyot
- DYNAFOR, INRA, Université de ToulouseCastanet TolosanFrance
- BIOGECO, INRA, Univ. BordeauxCestasFrance
- LTSER Zone Atelier «PYRÉNÉES GARONNE»Auzeville‐TolosaneFrance
| | | | | | - Laurent Burnel
- DYNAFOR, INRA, Université de ToulouseCastanet TolosanFrance
- LTSER Zone Atelier «PYRÉNÉES GARONNE»Auzeville‐TolosaneFrance
| | | | - Wilfried Heinz
- DYNAFOR, INRA, Université de ToulouseCastanet TolosanFrance
- LTSER Zone Atelier «PYRÉNÉES GARONNE»Auzeville‐TolosaneFrance
| | - Marc Deconchat
- DYNAFOR, INRA, Université de ToulouseCastanet TolosanFrance
- LTSER Zone Atelier «PYRÉNÉES GARONNE»Auzeville‐TolosaneFrance
| | - Aude Vialatte
- DYNAFOR, INRA, Université de ToulouseCastanet TolosanFrance
- LTSER Zone Atelier «PYRÉNÉES GARONNE»Auzeville‐TolosaneFrance
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21
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Abstract
Nonnative pests often cause cascading ecological impacts, leading to detrimental socioeconomic consequences; however, how plant diversity may influence insect and disease invasions remains unclear. High species diversity in host communities may promote pest invasions by providing more niches (i.e., facilitation), but it can also diminish invasion success because low host dominance may make it more difficult for pests to establish (i.e., dilution). Most studies to date have focused on small-scale, experimental, or individual pest/disease species, while large-scale empirical studies, especially in natural ecosystems, are extremely rare. Using subcontinental-level data, we examined the role of tree diversity on pest invasion across the conterminous United States and found that the tree-pest diversity relationships are hump-shaped. Pest diversity increases with tree diversity at low tree diversity (because of facilitation or amplification) and is reduced at higher tree diversity (as a result of dilution). Thus, tree diversity likely regulates forest pest invasion through both facilitation and dilution that operate simultaneously, but their relative strengths vary with overall diversity. Our findings suggest the role of native species diversity in regulating nonnative pest invasions.
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