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Auteur Teemu Tahvanainen |
Documents disponibles écrits par cet auteur (4)
Affiner la rechercheClassification of European bog vegetation of the Oxycocco-Sphagnetea class / Martin Jiroušek in Applied vegetation science, 25 (1) (2022)
Titre : Classification of European bog vegetation of the Oxycocco-Sphagnetea class Type de document : Imprimé Auteurs : Martin Jiroušek ; Tomáš Peterka ; Milan Chytrý (1967-) ; Borja Jiménez-Alfaro ; Oleg Kuznetsov ; Aaron Pérez-Haase ; Liene Aunina ; Idoia Biurrun ; Daniel Dite ; Nadezhda Goncharova ; Petra Hajkova ; Florian Jansen ; Natalia E. Koroleva ; Elena D. Lapshina ; Igor A. Lavrinenko ; Maxim G. Napreenko ; Pawel Pawlikowski ; Valerijus Rašomavičius ; John Rodwell ; David Romero Pedreira ; Elvira Sahuquillo Balbuena ; Viktor A. Smagin ; Teemu Tahvanainen ; Claudia Biţa-Nicolae ; Lyubov Felbaba-Klushyna ; Ulrich-Hans Graf ; Tatiana G. Ivchenko ; Ute Jandt ; Jana Jiroušková ; Alica Košuthová ; Jonathan Lenoir ; Viktor Onyshchenko ; Vítězslav Plášek ; Zuzana Plesková ; Pavel S. Shirokikh ; Anna Šímová ; Eva Šmerdová ; Pavel N. Tokarev ; Michal Hájek (1974-) Année de publication : 2022 Article en page(s) : 1-19 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Bryophytes Résumé : Aims : Classification of European bog vegetation (Oxycocco-Sphagnetea class); identification of diagnostic species for the class and vegetation subgroups (orders and alliances); development of an expert system for automatic classification of vegetation plots; and production of distribution maps of the Oxycocco-Sphagnetea class and its alliances. Location : Europe. Methods : A data set of vegetation-plot records was compiled to include various bog types over most of the European continent. An unsupervised classification (beta-flexible linkage method, Sørensen distance measure) and detrended correspondence analysis (DCA) ordination were applied. Formal definitions of syntaxa based on species presence and covers, and respecting the results of the unsupervised classification, were developed and included in a classification expert system. Results : The Oxycocco-Sphagnetea class, its two orders (Sphagno-Ericetalia tetralicis and Sphagnetalia medii) and seven compositionally distinct alliances were formally defined. In addition to the syntaxa included in EuroVegChecklist, three new alliances were distinguished: Rubo chamaemori-Dicranion elongati (subarctic polygon and palsa mires); Erico mackaianae-Sphagnion papillosi (blanket bogs of the northwestern Iberian Peninsula); and Sphagno baltici-Trichophorion cespitosi (boreal bog lawns). The latter alliance is newly described in this article. Conclusions : This first pan-European formalized classification of European bog vegetation partially followed the system presented in EuroVegChecklist, but suggested three additional alliances. One covers palsa and polygon mires, one covers Iberian bogs with endemics and one fills the syntaxonomical gap for lawn microhabitats in boreal bogs. A classification expert system has been developed, which allows assignment of vegetation plots to the types described.
Lien pérenne : DOI : 10.1111/avsc.12646 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=147842
in Applied vegetation science > 25 (1) (2022) . - 1-19Jiroušek, Martin, Peterka, Tomáš, Chytrý, Milan (1967-), Jiménez-Alfaro, Borja, Kuznetsov, Oleg, Pérez-Haase, Aaron, Aunina, Liene, Biurrun, Idoia, Dite, Daniel, Goncharova, Nadezhda, Hajkova, Petra, Jansen, Florian, Koroleva, Natalia E., Lapshina, Elena D., Lavrinenko, Igor A., Napreenko, Maxim G., Pawlikowski, Pawel, Rašomavičius, Valerijus, Rodwell, John, Romero Pedreira, David, Sahuquillo Balbuena, Elvira, Smagin, Viktor A., Tahvanainen, Teemu, Biţa-Nicolae, Claudia, Felbaba-Klushyna, Lyubov, Graf, Ulrich-Hans, Ivchenko, Tatiana G., Jandt, Ute, Jiroušková, Jana, Košuthová, Alica, Lenoir, Jonathan, Onyshchenko, Viktor, Plášek, Vítězslav, Plesková, Zuzana, Shirokikh, Pavel S., Šímová, Anna, Šmerdová, Eva, Tokarev, Pavel N., Hájek, Michal (1974-) 2022 Classification of European bog vegetation of the Oxycocco-Sphagnetea class. Applied vegetation science, 25(1): 1-19.Documents numériques
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Article (2022)URL
Titre : Comparing multispectral and hyperspectral UAV data for detecting peatland vegetation patterns Type de document : Numérique Auteurs : Yuwen Pang ; Aleksi Räsänen ; Franziska Wolff ; Teemu Tahvanainen ; Milja Männikkö ; Mika Aurela ; Pasi Korpelainen ; Timo Kumpula ; Tarmo Virtanen Année de publication : 2024 Article en page(s) : 12 p. Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Télédétection Résumé : Northern peatland vegetation exhibits fine-scale spatial and spectral heterogeneity that can potentially be captured with uncrewed aerial vehicle (UAV) data due to their ultra-high spatial resolution (<10 cm). From this perspective, the contribution of different spectral sensors in mapping various vegetation characteristics has not been thoroughly investigated. We delineated spatial patterns of plant community clusters, plant functional types (PFTs), and selected plant species with UAV hyperspectral (HS), UAV multispectral (MS), and airborne LiDAR (light detection and ranging) topography (TP) data in two northern peatlands. We conducted random forest (RF) regressions in a geographic object-based image analysis (GEOBIA) framework and compared the relative contributions of the different datasets. In the best regression models, the percentage of explained variance was 24–74 % (RMSE:0.24–0.31), 40–90 % (RMSE:0.12–0.41), and 18–90 % (RMSE:0.03–0.40) for plant community clusters, PFTs, and plant species, respectively. The MS-TP combination had, in many cases, the highest performance, while HS-based models had better performance for some plant community clusters, PFTs, and plant species. TP features were useful only in certain situations. Overall, our results suggest that UAV MS imagery combined with TP data outperformed or performed at least almost as well as the models using UAV HS data and while all data combinations are capable for fine-scale detection of vegetation in northern peatlands. A more comprehensive investigations of data processing and methodology selection is needed to conclude if there is an added value of UAV HS data for peatland vegetation monitoring Lien pérenne : DOI : 10.1016/j.jag.2024.104043 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155067
in International journal of applied earth observation and geoinformation > 132 (2024) . - 12 p.Pang, Yuwen, Räsänen, Aleksi, Wolff, Franziska, Tahvanainen, Teemu, Männikkö, Milja, Aurela, Mika, Korpelainen, Pasi, Kumpula, Timo, Virtanen, Tarmo 2024 Comparing multispectral and hyperspectral UAV data for detecting peatland vegetation patterns. International journal of applied earth observation and geoinformation, 132: 12 p..Documents numériques
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article (2024)Adobe Acrobat PDFEuropean red list of habitats : part 2. terrestrial and freshwater habitats / John A. M. Janssen (2016)
Titre : European red list of habitats : part 2. terrestrial and freshwater habitats Type de document : Numérique Auteurs : John A. M. Janssen (1967-) ; John S. Rodwell ; Mariana García Criado ; S. Gubbay ; T. Haynes ; Ana Nieto ; Natalie Sanders ; Flavia Landucci ; Javier Loidi (1953-) ; A. Ssymank ; Teemu Tahvanainen ; M. Valderrabano ; Alicia T. R. Acosta ; M. Aronsson ; Gertie H.P. Arts ; Fabio Attorre ; Erwin Bergmeier ; R. Bijlsma ; Frédéric Bioret ; Claudia Biţa-Nicolae ; Idoia Biurrun ; Marta Calix ; Jorge Capelo ; Andraž Čarni (1962-) ; Milan Chytrý (1967-) ; Jurgen Dengler ; Panayotis Dimopoulos ; Franz Essl (1973-) ; Hans Gardfjell ; Daniela Gigante ; Gianpetro Guisso del Galdo ; Michal Hájek (1974-) ; Florian Jansen ; Jan Jansen ; Jutta Kapfer ; A. Mickolajczak ; José Antonio Molina ; Zsolt Molnár ; David Paternoster ; Agnieszka Piernik ; B. Poulin ; Benoît Renaux ; Joop H.J. Schaminée ; K. Šumberová ; H. Toivonen ; T. Tonteri ; Ioannis Tsiripidis ; Rossen T. Tzonev ; Milan Valachovic Editeur : European Commission Année de publication : 2016 Importance : 38 p. ISBN/ISSN/EAN : 978-92-79-61588-7 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Legislation internationale (CEE)
[CBNPMP-Thématique] Livre RougeRésumé : The European Red List of Habitats provides an overview of the risk of collapse (degree of endangerment) of marine, terrestrial and freshwater habitats in the European Union (EU28) and adjacent regions (EU28+), based on a consistent set of criteria and categories and detailed data and expertise from involved countries. Amongst terrestrial and freshwater habitats the highest percentage of threatened types (categories Critically Endangered, Endangered, Vulnerable) was found amongst mires and bogs (85% in the EU28, 54% in the EU28+), followed by grasslands (53%, 49%), freshwater habitats (46%, 38%) and coastal habitats (45%, 43%). Relatively low percentages of heathland and scrub, forests, and sparsely vegetated habitats were assessed to be threatened. Overall the amount of threatened habitats was higher in the EU28 (36%) than in the wider range of the EU28+ (31%). The European Red List of Habitats provides extensive additional information on habitat classification and definition, pressures and threats, conservation and restorability of habitats, distribution, status and trends in individual countries, and sub-habitats that may possibly be threatened. The information provided can inform and support European nature and biodiversity policy in a variety of ways, particularly in relation to the EU2020 Biodiversity Strategy targets. Further applications include the revitalisation of the EUNIS habitat classification, synergies with the Mapping and Assessment of Ecosystems and their Services initiative, and the improvement of Red List methodologies. Lien pérenne : DOI : 10.2779/091372 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=83548 Janssen, John A. M. (1967-), Rodwell, John S., García Criado, Mariana, Gubbay, S., Haynes, T., Nieto, Ana, Sanders, Natalie, Landucci, Flavia, Loidi, Javier (1953-), Ssymank, A., Tahvanainen, Teemu, Valderrabano, M., Acosta, Alicia T. R., Aronsson, M., Arts, Gertie H.P., Attorre, Fabio, Bergmeier, Erwin, Bijlsma, R., Bioret, Frédéric, Biţa-Nicolae, Claudia, Biurrun, Idoia, Calix, Marta, Capelo, Jorge, Čarni, Andraž (1962-), Chytrý, Milan (1967-), Dengler, Jurgen, Dimopoulos, Panayotis, Essl, Franz (1973-), Gardfjell, Hans, Gigante, Daniela, Guisso del Galdo, Gianpetro, Hájek, Michal (1974-), Jansen, Florian, Jansen, Jan, Kapfer, Jutta, Mickolajczak, A., Molina, José Antonio, Molnár, Zsolt, Paternoster, David, Piernik, Agnieszka, Poulin, B., Renaux, Benoît, Schaminée, Joop H.J., Šumberová, K., Toivonen, H., Tonteri, T., Tsiripidis, Ioannis, Tzonev, Rossen T., Valachovic, Milan , 2016. European red list of habitats : part 2. terrestrial and freshwater habitats. European Commission, [S.l.]. 38 pp.Documents numériques
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Rapport (2016)URL
Titre : Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery Type de document : Imprimé Auteurs : Miguel Villoslada ; Henni Ylänne ; Tina H. M. Kolari ; Pasi Korpelainen ; Teemu Tahvanainen ; Franziska Wolff ; Timo Kumpula Année de publication : 2023 Article en page(s) : 687-706 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Télédétection Résumé : Herbivores can exert a controlling effect on the reproduction and growth of shrubs, thereby counter-acting the climate-driven encroachment of shrubs in the Arctic and the potential consequences. This control is particularly evident in the case of abundant herbivores, such as reindeer (Rangifer tarandus tarandus), whose grazing patterns are affected by management. Here, we tested how different reindeer grazing practices on the border between Finland and Norway impact the occurrence of willow (Salix spp.) dominated patches, their above-ground biomass (AGB) and the ability of willows to form dense thickets. We used a combination
of multispectral and RGB imagery obtained from unoccupied aerial vehicles field data and an ensemble of machine-learning models, which allowed us to model the occurrence of plant community types (Overall accuracy = 0.80), AGB fractions (maximum R2 = 0.90) and topsoil moisture (maximum R2 = 0.89). With this combination of approaches, we show that willows are kept in a browsing-trap under spring and early summer grazing by reindeer, growing mostly small and scattered in the landscape. In contrast, willows under the winter grazing regime formed dense stands, particularly within riparian areas. We confirm this pattern using a random forest willow habitat distribution model based on topographical parameters. The model shows that willow biomass correlated with parameters of optimal habitat quality only in the winter grazing regime and did not respond to the same parameters under spring and summer grazing of reindeer.Lien pérenne : DOI : 10.1002/rse2.337 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=155071
in Remote Sensing in Ecology and Conservation > 9 (2023) . - 687-706Villoslada, Miguel, Ylänne, Henni, Kolari, Tina H. M., Korpelainen, Pasi, Tahvanainen, Teemu, Wolff, Franziska, Kumpula, Timo 2023 Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery. Remote Sensing in Ecology and Conservation, 9: 687-706.Documents numériques
article (2023)URL
