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Deng J, Li J, Zhang X, Zeng L, Guo Y, Wang X, Chen Z, Zhou J, Huang X. Potential Global Invasion Risk of Scale Insect Pests Based on a Self-Organizing Map. INSECTS 2023; 14:572. [PMID: 37504579 PMCID: PMC10380675 DOI: 10.3390/insects14070572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/08/2023] [Accepted: 06/20/2023] [Indexed: 07/29/2023]
Abstract
In the present study, a global presence/absence dataset including 2486 scale insect species in 157 countries was extracted to assess the establishment risk of potential invasive species based on a self-organizing map (SOM). According to the similarities in species assemblages, a risk list of scale insects for each country was generated. Meanwhile, all countries in the dataset were divided into five clusters, each of which has high similarities of species assemblages. For those countries in the same neuron of the SOM output, they may pose the greatest threats to each other as the sources of potential invasive scale insect species, and therefore, require more attention from quarantine departments. In addition, normalized ζi values were used to measure the uncertainty of the SOM output. In total, 9 out of 63 neurons obtained high uncertainty with very low species counts, indicating that more investigation of scale insects should be undertaken in some parts of Africa, Asia and Northern Europe.
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Affiliation(s)
- Jun Deng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Junjie Li
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xinrui Zhang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Lingda Zeng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yanqing Guo
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xu Wang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zijing Chen
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jiali Zhou
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Xiaolei Huang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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Koutsikos N, Vardakas L, Vavalidis T, Kalogianni E, Dimitriou E, Kalantzi OI, Zogaris S. Defining non-indigenous fish assemblage types in Mediterranean rivers: Network analysis and management implications. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 278:111551. [PMID: 33157462 DOI: 10.1016/j.jenvman.2020.111551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 09/25/2020] [Accepted: 10/18/2020] [Indexed: 06/11/2023]
Abstract
The design and implementation of appropriate management actions to tackle the spread and negative impacts of non-indigenous fish species (NIFS) in freshwater ecosystems still remains a complex task. In an effort to address the limitations of current managerial approaches, our study develops and applies a classification framework to define non-indigenous fish assemblage types (FATs) in Mediterranean riverine ecosystems and identifies the linkage with various regional, local, biotic and abiotic environmental factors. This framework contributes to a pre-invasion stage screening and to the design of effective type-specific post-invasion management actions dealing with specific NIFS assemblages. A network analysis was applied in order to extract NIFS community level information from 393 samples obtained from 51 river basins of Greece, while a multivariate ordination analysis was conducted to detect the factors best explaining the structure and distribution of FATs. The association patterns of the study's inputs and outcomes are illustrated through an alluvial diagram, providing insights across different spatial scales. In total, five FATs were generated where the major NIFS contributors of average similarity within each modularity class revealed the key indicator species (Gambusia-FAT; Carassius/Lepomis-FAT; Pseudorasbora-FAT; Salmonids-FAT and Carp-FAT). Overall, the identified FATs varied spatially, indicating different community structure, mainly based on the diverse habitat preferences and life-history traits of indicator species. Alien FATs were mainly distributed within large and transboundary rivers, while Translocated and Salmonids FATs mostly occupied ecoregions with relatively depauperate faunas and often in biodiversity hotspots. The results of this study can identify conservation priorities within FATs, inform specific-type post-invasion management actions tackling NIFS, while in addition may provide valuable information for protecting high-priority water bodies before invasion.
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Affiliation(s)
- Nicholas Koutsikos
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavissos, 19013, Attica, Greece; Department of Environment, University of the Aegean, Mytilene, 81100, Greece.
| | - Leonidas Vardakas
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavissos, 19013, Attica, Greece
| | - Theocharis Vavalidis
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavissos, 19013, Attica, Greece
| | - Eleni Kalogianni
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavissos, 19013, Attica, Greece
| | - Elias Dimitriou
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavissos, 19013, Attica, Greece
| | | | - Stamatis Zogaris
- Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavissos, 19013, Attica, Greece
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Holt J, Leach AW. Linguistic variables as fuzzy sets to model uncertainty in the combined efficacy of multiple phytosanitary measures in pest risk analysis. Ecol Modell 2019. [DOI: 10.1016/j.ecolmodel.2019.04.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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O. M. K. BIOTECHNICAL INFORMATION SYSTEMS FOR MONITORING OF CHEMICALS IN ENVIRONMENT: BIOPHYSICAL APPROACH. BIOTECHNOLOGIA ACTA 2019. [DOI: 10.15407/biotech12.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Large Occupational Accidents Data Analysis with a Coupled Unsupervised Algorithm: The S.O.M. K-Means Method. An Application to the Wood Industry. SAFETY 2018. [DOI: 10.3390/safety4040051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Data on occupational accidents are usually stored in large databases by worker compensation authorities, and by the safety and prevention teams of companies. An analysis of these databases can play an important role in the prevention of accidents and the reduction of risks, but it can be a complex procedure because of the dimensions and complexity of such databases. The SKM (SOM K-Means) method, a two-level clustering system, made up of SOM (Self Organizing Map) and K-Means clustering, has obtained positive results in identifying the dynamics of critical accidents by referring to a database of 1200 occupational accidents that had occurred in the wood industry. The present research has been conducted to validate the recently presented SKM methodology through the analysis of a larger data set of more than 4000 occupational accidents that occurred in Piedmont (Italy), between 2006 and 2013. This work has partitioned the accidents into groups of different accident dynamics families and has quantified the severity and frequency of occurrence of these accidents. The obtained information may be of help to Company Managers and National Authorities to better address preventive measures and policies concerning the clusters that have been identified as being the most critical within a risk-based decision-making framework.
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Calil J, Reguero BG, Zamora AR, Losada IJ, Méndez FJ. Comparative Coastal Risk Index (CCRI): A multidisciplinary risk index for Latin America and the Caribbean. PLoS One 2017; 12:e0187011. [PMID: 29095841 PMCID: PMC5667813 DOI: 10.1371/journal.pone.0187011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 10/11/2017] [Indexed: 11/21/2022] Open
Abstract
As the world’s population grows to a projected 11.2 billion by 2100, the number of people living in low-lying areas exposed to coastal hazards is projected to increase. Critical infrastructure and valuable assets continue to be placed in vulnerable areas, and in recent years, millions of people have been displaced by natural hazards. Impacts from coastal hazards depend on the number of people, value of assets, and presence of critical resources in harm’s way. Risks related to natural hazards are determined by a complex interaction between physical hazards, the vulnerability of a society or social-ecological system and its exposure to such hazards. Moreover, these risks are amplified by challenging socioeconomic dynamics, including poorly planned urban development, income inequality, and poverty. This study employs a combination of machine learning clustering techniques (Self Organizing Maps and K-Means) and a spatial index, to assess coastal risks in Latin America and the Caribbean (LAC) on a comparative scale. The proposed method meets multiple objectives, including the identification of hotspots and key drivers of coastal risk, and the ability to process large-volume multidimensional and multivariate datasets, effectively reducing sixteen variables related to coastal hazards, geographic exposure, and socioeconomic vulnerability, into a single index. Our results demonstrate that in LAC, more than 500,000 people live in areas where coastal hazards, exposure (of people, assets and ecosystems) and poverty converge, creating the ideal conditions for a perfect storm. Hotspot locations of coastal risk, identified by the proposed Comparative Coastal Risk Index (CCRI), contain more than 300,00 people and include: El Oro, Ecuador; Sinaloa, Mexico; Usulutan, El Salvador; and Chiapas, Mexico. Our results provide important insights into potential adaptation alternatives that could reduce the impacts of future hazards. Effective adaptation options must not only focus on developing coastal defenses, but also on improving practices and policies related to urban development, agricultural land use, and conservation, as well as ameliorating socioeconomic conditions.
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Affiliation(s)
- Juliano Calil
- Center for the Blue Economy, Middlebury Institute of International Studies, Monterey, California, United States of America
- * E-mail:
| | - Borja G. Reguero
- Institute of Marine Sciences, University of California Santa Cruz, Santa Cruz, California, United States of America
- The Nature Conservancy, Santa Cruz, California, United States of America
| | - Ana R. Zamora
- Universidad de Cantabria, Santander, Cantabria, Spain
| | - Iñigo J. Losada
- Environmental Hydraulics Institute “IH Cantabria”, Universidad de Cantabria, Santander, Cantabria, Spain
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Leung B, Bradie J. Estimating non-indigenous species establishment and their impact on biodiversity, using the Relative Suitability Richness model. J Appl Ecol 2017. [DOI: 10.1111/1365-2664.12862] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Brian Leung
- Department of Biology; McGill University; Montreal QC H3A 1B1 Canada
- School of Environment; McGill University; Montreal QC H3A 1B1 Canada
| | - Johanna Bradie
- Department of Biology; McGill University; Montreal QC H3A 1B1 Canada
- Great Lakes Laboratory for Fisheries and Aquatic Sciences; Fisheries and Oceans Canada; 867 Lakeshore Rd Burlington ON L7S 1A1 Canada
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Roigé M, Parry M, Phillips C, Worner S. Self-organizing maps for analysing pest profiles: Sensitivity analysis of weights and ranks. Ecol Modell 2016. [DOI: 10.1016/j.ecolmodel.2016.10.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Roigé M, McGeoch MA, Hui C, Worner SP. Cluster validity and uncertainty assessment for self‐organizing map pest profile analysis. Methods Ecol Evol 2016. [DOI: 10.1111/2041-210x.12669] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mariona Roigé
- National Centre for Advanced Bio‐Protection Technologies Lincoln University PO Box 84 Canterbury 7647 New Zealand
| | - Melodie A. McGeoch
- School of Biological Sciences Monash University Clayton Vic. 3800 Australia
| | - Cang Hui
- Centre for Invasion Biology Department of Mathematical Sciences Stellenbosch University Matieland 7602 South Africa
- African Institute for Mathematical Sciences Muizenberg 7945 South Africa
| | - Susan P. Worner
- National Centre for Advanced Bio‐Protection Technologies Lincoln University PO Box 84 Canterbury 7647 New Zealand
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Qin Y, Paini DR, Wang C, Fang Y, Li Z. Global establishment risk of economically important fruit fly species (Tephritidae). PLoS One 2015; 10:e0116424. [PMID: 25588025 PMCID: PMC4294639 DOI: 10.1371/journal.pone.0116424] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2014] [Accepted: 12/09/2014] [Indexed: 11/26/2022] Open
Abstract
The global invasion of Tephritidae (fruit flies) attracts a great deal of attention in the field of plant quarantine and invasion biology because of their economic importance. Predicting which one in hundreds of potential invasive fruit fly species is most likely to establish in a region presents a significant challenge, but can be facilitated using a self organising map (SOM), which is able to analyse species associations to rank large numbers of species simultaneously with an index of establishment. A global presence/absence dataset including 180 economically significant fruit fly species in 118 countries was analysed using a SOM. We compare and contrast ranked lists from six countries selected from each continent, and also show that those countries geographically close were clustered together by the SOM analysis because they have similar fruit fly assemblages. These closely clustered countries therefore represent greater threats to each other as sources of invasive fruit fly species. Finally, we indicate how this SOM method could be utilized as an initial screen to support prioritizing fruit fly species for further research into their potential to invade a region.
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Affiliation(s)
- Yujia Qin
- Department of Entomology, College of Agronomy and Biotechnology, China Agricultural University, Beijing, P. R. China
| | | | - Cong Wang
- Department of Entomology, College of Agronomy and Biotechnology, China Agricultural University, Beijing, P. R. China
| | - Yan Fang
- Department of Entomology, College of Agronomy and Biotechnology, China Agricultural University, Beijing, P. R. China
| | - Zhihong Li
- Department of Entomology, College of Agronomy and Biotechnology, China Agricultural University, Beijing, P. R. China
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AGUILAR-GONZÁLEZ ME, LUNA-GONZÁLEZ A, AGUIRRE A, ZAVALA-NORZAGARAY AA, MUNDO-OCAMPO M, GONZÁLEZ-OCAMPO HA. Perceptions of fishers to sea turtle bycatch, illegal capture and consumption in the San Ignacio-Navachiste-Macapule lagoon complex, Gulf of California, Mexico. Integr Zool 2014; 9:70-84. [DOI: 10.1111/1749-4877.12024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Myrna E. AGUILAR-GONZÁLEZ
- National Polytechnic Institute (IPN); CIIDIR-IPN, UNIDAD SINALOA; Juan de Dios Batiz Paredes Guasave Sinaloa Mexico
| | - Antonio LUNA-GONZÁLEZ
- National Polytechnic Institute (IPN); CIIDIR-IPN, UNIDAD SINALOA; Juan de Dios Batiz Paredes Guasave Sinaloa Mexico
| | - Alonso AGUIRRE
- Department of Environmental Science and Policy; George Mason University; Front Royal VA USA
| | - Alan A. ZAVALA-NORZAGARAY
- National Polytechnic Institute (IPN); CIIDIR-IPN, UNIDAD SINALOA; Juan de Dios Batiz Paredes Guasave Sinaloa Mexico
| | - Manuel MUNDO-OCAMPO
- National Polytechnic Institute (IPN); CIIDIR-IPN, UNIDAD SINALOA; Juan de Dios Batiz Paredes Guasave Sinaloa Mexico
| | - Héctor A. GONZÁLEZ-OCAMPO
- National Polytechnic Institute (IPN); CIIDIR-IPN, UNIDAD SINALOA; Juan de Dios Batiz Paredes Guasave Sinaloa Mexico
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Singh SK, Paini DR, Ash GJ, Hodda M. Prioritising plant-parasitic nematode species biosecurity risks using self organising maps. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0588-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Worner S, Gevrey M, Eschen R, Kenis M, Paini D, Singh S, Watts M, Suiter K. Prioritizing the risk of plant pests by clustering methods; self-organising maps, k-means and hierarchical clustering. NEOBIOTA 2013. [DOI: 10.3897/neobiota.18.4042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Leung B, Roura-Pascual N, Bacher S, Heikkilä J, Brotons L, Burgman MA, Dehnen-Schmutz K, Essl F, Hulme PE, Richardson DM, Sol D, Vilà M, Rejmanek M. TEASIng apart alien species risk assessments: a framework for best practices. Ecol Lett 2012; 15:1475-93. [PMID: 23020170 DOI: 10.1111/ele.12003] [Citation(s) in RCA: 212] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 05/08/2012] [Accepted: 08/19/2012] [Indexed: 12/01/2022]
Abstract
Some alien species cause substantial impacts, yet most are innocuous. Given limited resources, forecasting risks from alien species will help prioritise management. Given that risk assessment (RA) approaches vary widely, a synthesis is timely to highlight best practices. We reviewed quantitative and scoring RAs, integrating > 300 publications into arguably the most rigorous quantitative RA framework currently existing, and mapping each study onto our framework, which combines Transport, Establishment, Abundance, Spread and Impact (TEASI). Quantitative models generally measured single risk components (78% of studies), often focusing on Establishment alone (79%). Although dominant in academia, quantitative RAs are underused in policy, and should be made more accessible. Accommodating heterogeneous limited data, combining across risk components, and developing generalised RAs across species, space and time without requiring new models for each species may increase attractiveness for policy applications. Comparatively, scoring approaches covered more risk components (50% examined > 3 components), with Impact being the most common component (87%), and have been widely applied in policy (> 57%), but primarily employed expert opinion. Our framework provides guidance for questions asked, combining scores and other improvements. Our risk framework need not be completely parameterised to be informative, but instead identifies opportunities for improvement in alien species RA.
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Affiliation(s)
- Brian Leung
- Department of Biology, McGill University, Montreal, Quebec, Canada.
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15
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Ruíz-López DM, Aragón-Noriega AE, Luna-Gonzalez A, Gonzalez-Ocampo HA. Applying fuzzy logic to assess human perception in relation to conservation plan efficiency measures within a biosphere reserve. AMBIO 2012; 41:467-478. [PMID: 22351598 PMCID: PMC3390572 DOI: 10.1007/s13280-012-0252-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 08/09/2011] [Accepted: 01/18/2012] [Indexed: 05/31/2023]
Abstract
The objective of this study is to present an efficiency-perception impact assessment based upon the integration of fuzzy logic (FL) of the "Productive Reconversion" conservation program (PRP) instituted by the Mexican government, in the upper Gulf of California and the Colorado Delta Biosphere Reserve. This approach enables environmental analysts to deal with the intrinsic imprecision and ambiguity associated with people's judgments and conclusions. The application of FL to the assessment of program efficiency is illustrated in this work, demonstrating how subjective perceptions can be converted into quantitative values easy to evaluate during the decision-making process.
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Affiliation(s)
| | - Alberto E. Aragón-Noriega
- Centro de Investigaciones Biológicas del Noroeste, S.C., Mar Bermejo No. 195, Col. Playa Palo de Santa Rita Apdo. Postal 128, La Paz, BCS 23090 Mexico
| | - Antonio Luna-Gonzalez
- Instituto Politecnico Nacional, Bulevar Juan de Dios Bátiz Paredes #250, Guasave, SIN 81101 Mexico
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Olivero J, Real R, Márquez AL. Fuzzy chorotypes as a conceptual tool to improve insight into biogeographic patterns. Syst Biol 2011; 60:645-60. [PMID: 21471308 DOI: 10.1093/sysbio/syr026] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Chorotypes--statistically significant groups of coincident distribution areas--constitute biogeographic units that are fuzzy by nature. This quality has been referred to in the literature but has not been analyzed in depth or methodologically developed. The present work redefines chorotypes as fuzzy sets from a pragmatic perspective and basically focuses on the methodological and interpretative implications of this approach. The amphibian fauna in the Iberian Peninsula was used as an example to explore the fuzzy nature of chorotypes. The method on which this article is based is a widely used technique to define chorotypes. This method involves the fuzziness that is inherent to the identification between degree of similarity and degree of membership and includes a probabilistic analysis of the classification for the objective delimitation of chorotypes. The main innovation of this paper is a procedure to analyze chorotypes as fuzzy biogeographic units. A set of fuzzy parameters to deal with the biogeographic interpretation of fuzzy chorotypes is also described. A computer program has been developed and is freely available. History may be related to the degree of fuzziness of chorotypes. In our example, with amphibian distributions in Iberia, less fuzzy chorotypes could have a historical explanation, and the internal fuzziness of chorotypes increases with their distance to hypothetical Pleistocene refugia.
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Affiliation(s)
- Jesús Olivero
- Grupo de Biogeografía, Diversidad y Conservación, Departamento de Biología Animal, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain.
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Zhang J, Li S, Li M. A comparison of self-organizing feature map clustering with TWINSPAN and fuzzy C-means clustering in the analysis of woodland communities in the Guancen Mts, China. COMMUNITY ECOL 2010. [DOI: 10.1556/comec.11.2010.1.17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Watts MJ, Worner S. Estimating the risk of insect species invasion: Kohonen self-organising maps versus k-means clustering. Ecol Modell 2009. [DOI: 10.1016/j.ecolmodel.2008.12.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Constructions of logical expressions in analysis of vegetation transformations. ECOLOGICAL QUESTIONS 2008. [DOI: 10.2478/v10090-009-0009-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Lamour A, Lotz LA. The importance of tillage depth in relation to seedling emergence in stale seedbeds. Ecol Modell 2007. [DOI: 10.1016/j.ecolmodel.2006.10.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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