Is variable plot size a serious constraint in broad‐scale vegetation studies? A case study on fens

Peterka, Tomáš; Syrovátka, Vít; Dítě, Daniel; Hájková, Petra; Hrubanová, Monika; Jiroušek, Martin; Plesková, Zuzana; Singh, Patrícia; Šímová, Anna; Šmerdová, Eva; Hájek, Michal

doi:10.1111/jvs.12885

Cited by 13 publications

(11 citation statements)

References 88 publications

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“…As in Peterka et al (2017), we selected only georeferenced plots of a size of 1–100 m 2 , for which a complete list of moss and vascular plant taxa was reported. Peterka et al (2020) demonstrated that plot sizes of at least 1 m 2 sufficiently describe the broad‐scale pattern in the representation of fen specialists and may be safely merged in broad‐scale analyses with larger plots sizes, without introducing substantial bias. Restriction to a narrower plot size range would have resulted in a considerable loss of essential data from several regions.…”

Section: Methodsmentioning

confidence: 99%

Rising temperature modulates pH niches of fen species

Hájek

Těšitel

Tahvanainen

et al. 2021

Global Change Biology

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Rising temperatures may endanger fragile ecosystems because their character and key species show different habitat affinities under different climates. This assumption has only been tested in limited geographical scales. In fens, one of the most endangered ecosystems in Europe, broader pH niches have been reported from cold areas and are expected for colder past periods. We used the largest European-scale vegetation database from fens to test the hypothesis that pH interacts with macroclimate temperature in forming realized niches of fen moss and vascular plant species. We calibrated the data set (29,885 plots after heterogeneity-constrained resampling) with temperature, using two macroclimate variables, and with the adjusted pH, a variable combining pH and calcium richness. We modelled temperature, pH and water level niches for one hundred species best characterizing European fens using generalized additive models and tested the interaction between pH and temperature. Fifty-five fen species showed a statistically significant interaction between pH and temperature (adj p ˂ .01). Forty-six of them (84%) showed a positive interaction manifested

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Section: Methodsmentioning

confidence: 99%

Rising temperature modulates pH niches of fen species

Hájek

Těšitel

Tahvanainen

et al. 2021

Global Change Biology

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“…The raw data set used for the analysis included 4,942 vegetation plots. Since it contained records from plots of variable size, which may affect the results (Otýpková and Chytrý, 2006; Dengler et al, 2009; but see Peterka et al, 2020), we removed plots of the size <4 m 2 or >200 m 2 . The plots with missing size information were preserved in the data set, assuming that most of them were within this range of plot sizes.…”

Section: Methodsmentioning

confidence: 99%

Vegetation of the European mountain river gravel bars: A formalized classification

Kalníková

Chytrý

Biță‐Nicolae

et al. 2020

Applied Vegetation Science

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Aims: River gravel bars are endangered habitats in Europe. However, classification schemes of their vegetation and habitat types differ among European countries, and they are even ignored in some national schemes. This causes problems in conservation planning, monitoring and management. Hence we aimed at building the first unified vegetation classification for river gravel-bar habitats across European mountain systems. Location: Europe. Methods: In total 4,769 vegetation plot records of river gravel-bar plant communities were collected from national, regional or private databases, digitized from the literature and newly collected in the field. A hierarchical classification expert system with formal definitions of vegetation types was created. The definitions combined the criteria of presence or cover of groups of species with similar ecology or single species narrowly specialized to a particular gravel-bar habitat. The TWINSPAN classification was applied to early-successional vegetation types to check whether the classification based on formal definitions was supported by the results of unsupervised classification. Similarity patterns among vegetation types were visualized using the detrended correspondence analysis (DCA) ordination. Results: Early-successional and scrub gravel-bar vegetation types were respectively classified into two classes: Thlaspietea rotundifolii and Salicetea purpureae. Eleven associations and four alliances (Calamagrostion pseudophragmitae, Epilobion fleischeri, Salicion cantabricae and Salicion eleagno-daphnoidis) were defined formally. Based on a critical revision, some associations or alliances defined in the previous literature were merged or discarded. The main gradient in variability within the gravel-bar vegetation is connected with the altitudinal gradient, biogeographical variation, local hydromorphological processes and various successional changes. Conclusions: The first unified and formalized classification system of the European mountain river gravel-bar vegetation was created, and species composition, ecology 2 of 27 | Applied Vegetation Science KALNÍKOVÁ et AL. 1 | INTRODUC TI ON Gravel bars of mountain stream beds and banks are azonal habitats that host specialized flora and specific vegetation types. They are typical of wandering or braided river systems occurring from glacial river floodplains in the alpine belt to broad floodplains in the piedmonts. They develop on rivers with significant variation in discharge and are maintained by torrents that are bringing new sediments and regularly disturbing or rearranging river banks. Gravel bars occur preferably in places where the strong current suddenly slows down, allowing the deposition of the particles released by bank erosion in the upstream

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“…Sample-size correction (only plots equal to or larger than 1 m 2 and equal to or smaller than 100 m 2 were kept; Peterka et al, 2020).…”

Section: Of 19mentioning

confidence: 99%

Classification of European bog vegetation of the Oxycocco‐Sphagnetea class

Jiroušek

Peterka

Chytrý

et al. 2022

Applied Vegetation Science

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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.

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Is variable plot size a serious constraint in broad‐scale vegetation studies? A case study on fens

Cited by 13 publications

References 88 publications

Rising temperature modulates pH niches of fen species

Rising temperature modulates pH niches of fen species

Vegetation of the European mountain river gravel bars: A formalized classification

Classification of European bog vegetation of the Oxycocco‐Sphagnetea class

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