From basic taxonomic data towards a synthesis in plant ... · factor and year as a covariate...
Transcript of From basic taxonomic data towards a synthesis in plant ... · factor and year as a covariate...
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From basic taxonomic data towardsa synthesis in plant invasion ecology
Petr Pyšek
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ca 2700 native + 1378 alien taxa⇒ Aliens form 33% of the Czech flora
Pyšek P., Sádlo J. & Mandák B. 2002. Catalogue of alienplants of the Czech Republic. Preslia 74: 97–186.
Alien flora of the Czech Republic
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• For 55% of alien species in the Czech Republic, Flora Europaeaerroneously states that they are naturalized in this country
• 111 naturalized aliens in the Czech Republic (48.5%) are not reported in Flora Europaea for this country
Pyšek P. (2003) How reliable are data on alien species in Flora Europaea? Flora 198: 499–507.
Alien flora of the Czech Republic in Flora Europaea
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Millennium Ecosystem Assessment: Ecosystems and Human Well-being – Synthesis
2005
Biological invasions are a problem of global significance
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Invasions are global … How does it relate to taxonomy?
In terms of taxonomy, global phenomenon has local consequences …
Lambdon P. W., Pyšek P., Basnou C. et al. 2008. Alien flora of Europe: species diversity, temporal trends, geographical patterns and research needs. Preslia 80: 101–149.
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propagule pressurefrom human activities
climatic suitability
number of South African species naturalized elsewhere can beexplained by climatic suitability and propagule pressure(explaining 79% of variation in the data)
Thuiller W., Richardson D. M., Pyšek P. et al. 2005. Niche-based modelling as a tool for predicting the risk of alien plant invasions at a global scale. Global Change Biology 11: 2234–2250.
Global risk from invasions by South African plants
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1st Reason Why Taxonomy Is Important for Invasion Ecology
Good taxonomic expertise is necessaryAll ecology depends on taxonomy – you are telling us what our species are ☺
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www.europe-aliens.org
DAISIE: Delivering Alien Species Inventories for Europe
6th Framework Programmeof the European Union
STREP (Specific TargetedResearch Proposal)
Duration: 2005-2008
Coordinator: NERC Centre forEcology & Hydrology, UK:Phil Hulme, David Roy
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DAISIE: Partners
18 partners
15 countries:
AustriaCzech RepublicFranceGermanyGreeceIrelandIsraelItalyLithuaniaRussian FederationSloveniaSpainSwedenSwitzerlandUnited Kingdom
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DAISIE: Objectives
1. To create an inventory of invasive species that threatenEuropean terrestrial, fresh-water and marine environments
2. To structure the inventory to provide the basis for preventionand control of biological invasions through the understanding ofthe environmental, social, economic and other factors involved
3. To assess and summarise the ecological, economic and healthrisks and impacts of the most widespread and/or noxiousinvasive species
4. To use distribution data and the experiences of the individualMember States as a framework for considering indicators forearly warning
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1.To create an inventory of invasive species that threaten Europeanterrestrial, fresh-water and marine environments
DAISIE: European Alien Species Database
Over 10,667 taxa are alien somewhere in Europe
Terrestrial:Plants 5789Fungi 84Invertebrates 2519Vertebrates 370
Aquatic:Inland 480Marine 1069
> 45,000 introduction events (species-region records) documented
71 terrestrial countries/regions & 9 marine areas
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DAISIE: European Alien Invasive Species Gateway
Search by:
•Species•Regions•Summaries
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DAISIE: Handbook of Alien Species (2009)
• Summary chaptersfor taxonomicgroups
• Complete list ofalien species in Europe
• Chapters on 100 worst
83 authors from partner institutions & 99 collaborators
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Alien flora of Europe
www.preslia.cz
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Alien in Europe(complete alien
flora)
Alien to Europe(native range outsideEuropean continent)
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=to
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DAISIE: classification of origin
Aliens with nativerange in some part ofEurope, but invading in other parts of Europe
Lambdon P. W., Pyšek P., Basnou C. et al. 2008. Alien flora of Europe: species diversity, temporal trends, geographical patterns and research needs. Preslia 80: 101–149.
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49 countries/regions
Total:5789 alien plant species
(2843 of origin outside Europe)
Naturalized:3749 species
(1780 of origin outside Europe)
Europe – ca 10 000 native speciesaliens = ca 22%
Alien flora of Europe: Big picture
Lambdon P. W., Pyšek P., Basnou C. et al. 2008. Alien flora of Europe: species diversity, temporal trends, geographical patterns and research needs. Preslia 80: 101–149.
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Invasion trends: alien plants in Europe
6 species/year
European origin
Extra-Europeanorigin
Lambdon P. W., Pyšek P., Basnou C. et al. 2008. Alien flora of Europe: species diversity, temporal trends, geographical patterns and research needs. Preslia 80: 101–149.
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Species distributionsNumbers of aliens in countries
Alien flora of Europe: distribution in regions
Pyšek P., Lambdon P., Arianoutsou M., Kühn I., Pino J. & Winter M. (2009): Alien vascular plants of Europe. – In: DAISIE (eds), Handbook of alien species in Europe, p. 43–61, Springer, Berlin.
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2st Reason Why Taxonomy Is Important for Invasion Ecology
Much of the knowledge in current invasion ecology derives from the
studies of congeneric species
… explicit role of taxonomy in studies on plant invasions
Comparison of alien species with native, or invasive with non-invasive aliens: •filtering out phylogenetic bias•bias associated with the region of origin•congeners often occur in similar habitats
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Fallopia × bohemica (Chrtek & Chrtková) J. P. Bailey
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Taxa of the genus Fallopia in Czech Republic
Fallopia sachalinensis(F. Schmidt) Ronse Decraene
native to Japan and Sakhalin
Fallopia japonica (Houtt.) Ronse Decraene var. japonica
Native from North Japan through Korea and China to Taiwan
Mandák B., Bímová K., Pyšek P., Štepánek J. & Plačková I. 2005.Isoenzyme diversity in Reynoutria (Polygonaceae) taxa: escape from sterility by hybridization. Plant Syst. Evol. 253: 219–230.
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Taxa of the genus Fallopia in Czech Republic
Mandák B., Pyšek P., Lysák M., Suda J., Krahulcová A. & Bímová K. 2003. Variation in DNA-ploidy levels of Reynoutriataxa in the Czech Republic. Ann. Bot. 96: 265–272.
In invaded range knotweeds reproduce and spread almost exclusively vegetatively, but rare hybridization events do occur
the pattern of hybridization is complex and hybrids are difficult to determine
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Pyšek P. et al. (2001) Persistence of stout clonal herbs as invaders in thelandscape: a field test of historical records. In: Brundu G. et al. (eds.), Plantinvasions, p. 235–244, Backhuys Publishers, Leiden.
correct determinationof Fallopia japonica in floristic papers = 87%
correct determinationof F. sachalinensis in floristic papers = 84%
proportion of F. bohemica determinedas either of parents = 20.1%
Problems with determination of knotweeds in floristic literature
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History of invasion and distribution in the Czech Republic
Fallopia japonica
first record 18831335 localities
F. sachalinensis
first record 1869261 localities
F. × bohemica
first record 1950381 localities
Mandák B., Pyšek P. & Bímová K. 2004. History of the invasion and distribution of Reynoutria taxa in the Czech Republic: a hybrid spreading faster than its parents. Preslia 76: 15-64.
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Distribution of Fallopia taxa in the Czech Republic
2000
2000 2000
×
F. japonica: 381 grid cells (54.6%)
F. sachalinensis: 158 grid cells (22.7%)
F. × bohemica: 149 grid cells (21.4%)
Fallopiajaponica is most widespread butthe hybrid is as much widespread as F. sachalinensis
Mandák B., Pyšek P. & Bímová K. 2004. History of the invasion and distribution of Reynoutriataxa in the Czech Republic: a hybrid spreading faster than its parents. Preslia 76: 15-64.
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Persistence of Fallopia clones in invaded sites
japo
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Fallopia japonica – persistence in 86% localitiesFallopia sachalinensis – persistence in 75% localities
Pyšek P. et al. (2001) Persistence of stout clonal herbs as invaders in thelandscape: a field test of historical records. In: Brundu G. et al. (eds.), Plantinvasions, p. 235–244, Backhuys Publishers, Leiden.
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Comparing the rate of invasion in the Czech Republic
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Differences in slopes (= measure of the rate ofinvasion) were tested using ANCOVA with species as a factor and year as a covariate
statistical analysis: 1950-2000
Mandák B., Pyšek P. & Bímová K. 2004. History of the invasion and distribution of Reynoutria taxa in the Czech Republic: a hybrid spreading faster than its parents. Preslia 76: 15-64.
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F. japonica= 0.049
F. sachalinensis= 0.042
F. bohemica= 0.086
Since this first record in the wild, the hybrid exhibits twice therate of invasion of its parents, measured as the number ofoccupied localities
Rate of invasion: F. × bohemica> F. japonica
> F. sachalinensis
Comparing the rate of invasion in the Czech Republic
Mandák B., Pyšek P. & Bímová K. 2004. History of the invasion and distribution of Reynoutria taxa in the Czech Republic: a hybrid spreading faster than its parents. Preslia 76: 15-64.
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Fallopia taxa: hybrid superior to the parentsEXPLICIT ROLE OF TAXONOMY: Only after the taxonomy was disentangled, we were able to analyse the invasion dynamics, and conduct a number of ecological studies …
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Fallopia taxa: hybrid superior to the parents
The invasion of the hybrid taxon Fallopia × bohemica in the Czech Republic is faster than that of either parentalspecies
Higher regeneration ability of the hybrid, compared to both parents, contributes to its invasiveness at thelandscape level, and so does the fact that it is superior in direct competition with parental species
There seem to be ongoing evolution of novel hybrid genotypes of F. × bohemica with superior regenerationcharacteristics, that are produced sexually and fixed by clonal growth, and may become threat to nativevegetation
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3rd Reason Why Taxonomy Is Important for Invasion Ecology
Invasion Ecology Is About Distributions
… implicit role of taxonomy in studies on plant invasions
In macroecological studies based on whole floras, it is impossible to deal with each species in detail – yet such studies depend on good primary taxonomic, floristic and phytogeographic information
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Central-European flora as a source of invasions
A study• using source area approach• evaluating invasion success at global scale• distinguishing between two phases of invasion• exploring relative importance of distribution and traits• considering direct and indirect effects of biological traits
1. Distribution in native region is the major determinant of theprobability of a species to become an alien, but not necessarily invasive
1. The role of biological traits is stage-dependent: traits have direct effect when it comes to the probability of a species to become invasive
Pyšek P., Jarošík V., Pergl J., Randall R., Chytrý M., Kühn I., Tichý L., Danihelka J., Chrtek J. jun. & Sádlo J.: Relative effects of species traits and nativedistribution ranges on the global invasion success of Central-European plantsdepend on the stage of invasion (in review)
The minor and only indirect role of traits in early stages of invasion process advocates for precautionary approach to the management. Common species which have large native ranges should be paid increased attention upon introductions
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How is it in reality: Does taxonomy interact sufficiently with invasion ecology?
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DAISIE: European Alien Species Expertise Registry
database ofexpertsstudyingbiologicalinvasions(searchable by taxa, region and experise)
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ecology24%
Only 17% of the registered claim to be taxonomic experts
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Hulme P., Pyšek P., Nentwig W. & Vilà M. 2009. Will threat of biological invasions unite the European Union? Science 324: 40–41.
Rates of introduction in alltaxonomic groups accelerate – the need for taxonomic expertise will increase in Europe
Costs of biological invasionsin Europe estimated at: 12,700,000,000 € annually(Genovesi et al., in prep.)
•European and Mediterranean Plant Protection Organisation (EPPO)
•European Food Safety Authority (EFSA)•European Environment Agency (EEA)
European Centre For Invasive Species Management (ECISM) ?
Invasive alien species in Europe: The future
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European Centre For Invasive Species Management (ECISM) ?
Scientific Advice and Research DirectionInformation service to the Commission, the Parliament, the Member States and their citizens; advise on targeting research, identifying gaps
Surveillance and Early WarningMaintenance of the DAISIE database and its development to earlywarning system; warning lists, immediate removal of newly detectedinvaders
Horizon Scanning and Risk AssessmentDevelopment of an integrated invasive species risk assessment scheme; monitoring of pathways; regular reporting of emerging threats
Rapid and Continuing ResponseTimely reaction to invasion threats; coordinated approach; mobilizationof experts; guidelines and operating procedures for eradications
Training and Capacity BuildingPublic awareness and stakeholder consultation ….
Hulme P., Pyšek P., Nentwig W. & Vilà M. 2009. Will threat of biological invasions unite the European Union? Science 324: 40–41.
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Milan ChytrýVojtěch JarošíkMartin HejdaPhil HulmeIngolf KühnPhil LambdonBohumil MandákWolfgang Nentwig
Ivan OstrýJan PerglIrena PerglováZuzana SixtováLubomír TichýMontse VilàMarten Winter
Credits