scholarly journals Grassland communities of Stol mountain (eastern Serbia ): Vegetation and environment al relationships

2013 ◽  
Vol 65 (1) ◽  
pp. 211-227 ◽  
Author(s):  
Svetlana Acic ◽  
U. Silc ◽  
S. Vrbnicanin ◽  
Svjetlana Cupac ◽  
G. Topisirovic ◽  
...  
Keyword(s):  
Species Composition ◽  
Environmental Gradient ◽  
Environmental Gradients ◽  
Detrended Correspondence Analysis ◽  
Ecological Indicator ◽  
Vegetation Types ◽  
Indicator Values ◽  
Grassland Vegetation ◽  
Data Set ◽  
Grassland Communities

The systematic survey of grassland communities was performed on Mt. Stol (eastern Serbia). The main aims of the research were to: (1) determine grassland vegetation types of the researched area; (2) correlate the impacts of the soil and environmental conditions on the occurrence of certain plant communities, and (3) comment on the conservational value of the grasslands in the researched area. The data set included 60 phytosociological relev?s of grasslands recorded between 2001 and 2004. The main environmental gradients of species composition were analyzed by Detrended Correspondence Analysis (DCA). For the ecological interpretation of ordination axes, ecological indicator values were used. Three associations were distinguished: Danthonietum calycinae, Asperulo-Agrostietum vulgaris and Ranunculo bulbosi- Arrhenatheretum elatioris belonging to two alliances and two classes: Chrysopogono-Danthonion - Festuco-Brometea and Arrhenatherion - Molinio-Arrhenatheretea. The results of the DCA support our assumption that the main environmental gradient in the species composition of the grasslands is related to nutrients and moisture. The conservational value of grasslands in the researched area is discussed.

scholarly journals Ecological Evaluation of Grassland Vegetation in Hodrušská Hornatina Highland

2020 ◽  
Vol 39 (3) ◽  
pp. 236-249
Author(s):  
Alexandra Klimantová
Keyword(s):  
Species Composition ◽  
Environmental Variables ◽  
Environmental Gradient ◽  
Detrended Correspondence Analysis ◽  
Grassland Vegetation ◽  
Ecological Evaluation ◽  
Factors Affecting ◽  
Phytosociological Relevés ◽  
Grassland Communities

AbstractIn the submitted paper, we have analysed the results of a systematic survey of grassland communities, performed in Hodrušská hornatina highland, in Štiavnické vrchy mountains. The main aims of the research were: i) syntaxonomical classification of grassland vegetation; ii) analysis of the main ecological gradients in species composition; iii) evaluation of the influence of environmental factors on species composition of grasslands. The dataset included 153 phytosociological relevés recorded on grasslands. Grassland communities were classified within five associations: Holcetum lanati, Pastinaco sativae-Arrhenatheretum elatioris, Alchemillo-Arrhenatheretum elatioris, Anthoxantho odorati-Agrostietum tenuis, Onobrychido viciifoliae-Brometum erecti; and the successional and transitional stages belonging to alliances Arrhenatherion elatioris and Bromion erecti. The results of the Detrended Correspondence Analysis support our assumption that the main environmental gradient in species composition on grassland is related to moisture. The results of the Redundancy Analysis show that all used environmental variables explained 3.4% of the variability of the species data. The most important factors affecting the species composition were altitude, slope, distance from settlements, and management.

scholarly journals The vegetation types and management units of Goedverwacht farm in the mixed bushveld of the Northern Province, South Africa

Koedoe ◽  
1997 ◽  
Vol 40 (2) ◽  
Author(s):  
L. Breebaart ◽  
M. Deutschlander
Keyword(s):  
Plant Communities ◽  
Correspondence Analysis ◽  
Canonical Correspondence Analysis ◽  
Environmental Gradient ◽  
Detrended Correspondence Analysis ◽  
Northern Province ◽  
Computer Programme ◽  
Data Set ◽  
Management Units ◽  
Floristic Data

An analysis of the vegetation of Goedverwacht farm in the mixed bushveld of the Northern Province is presented. Releves were compiled in 33 stratified random sample plots. Eight distinct plant communities were identified by means ofBraun-Blanquet pro-cedures. Detrended correspondence analysis (DCA) was applied to the floristic data set using the computer programme DECORANA (Detrended Correspondence Analysis) to determine a probable environmental gradient and to facilitate in the identification of management units. The computer programme CANOCO (Canonical Correspondence Analysis) was used to apply canonical correspondence analysis (CCA) to the floristic data set. Two management units were determined by means of vegetation ordinations and soil data. A classification, description and ecological interpretation of the plant communities as well as a description of the management units are presented.

Diversity of subalpine and alpine vegetation of the eastern part of the Nízke Tatry Mts in Slovakia: major types and environmental gradients

Biologia ◽  
2009 ◽  
Vol 64 (5) ◽  
Author(s):  
Lucia Sekulová ◽  
Michal Hájek
Keyword(s):  
Plant Communities ◽  
Environmental Gradients ◽  
Ecological Factors ◽  
Detrended Correspondence Analysis ◽  
Dwarf Shrub ◽  
Soil Reaction ◽  
Data Set ◽  
Entire Data ◽  
Second Gradient ◽  
One Year

AbstractChanges in composition and structure of alpine and subalpine plant communities in relation to ecological factors were analysed in the Nízke Tatry Mts, Slovakia. Species cover values of vascular and non-vascular plants in each vegetation plot were recorded on the nine-degree scale. A data set of 156 relevés of alpine and subalpine vegetation was sampled recently during one year in the eastern part of the Nízke Tatry National Park. The data set was analysed by cluster analysis and Detrended Correspondence Analysis. analyses were carried out on the entire data set, including the subset of short grassland and dwarf-shrub vegetation. Major gradients and clusters were ecologically interpreted using Ellenberg indicator values. In the entire data set, the major gradient in species composition was associated with nutrient availability and the second most important gradient with light. In the case of short grassland and dwarf-shrub vegetation, the gradients were different. The first one was associated with soil reaction and the second gradient was associated with moisture. Clusters proposed by numerical classification reproduced many traditional phytosociological associations, namely Seslerietum distichae, Sphagno capillifolii-Empetretum nigri, Junco trifidi-Callunetum vulgaris, Juncetum trifidi, Dryopterido dilatatae-Pinetum mugo, Luzuletum obscurae, Agrostio pyrenaiceae-Nardetum strictae, while some other associations were less clearly differentiated (communities of the alliances Calamagrostion villosae, Adenostylion alliariae, Trisetion fusci, Cratoneuro filicini-Calthion laetae or Salicion herbaceae). The next clusters included Vaccinium and Festuca supina dominated communities and artificial roadside grasslands sown 50 years ago. Bryophytes and lichens were highly represented among diagnostic species of particular associations. Distribution pattern of particular plant communities was strongly influenced by site position either on northern or southern slope of the mountains.

Synanthropic vegetation of the Eragrostion cilianensi-minoris alliance in the Czech Republic

Biologia ◽  
2011 ◽  
Vol 66 (6) ◽  
Author(s):  
Radomír Němec ◽  
Zdeňka Lososová ◽  
Pavel Dřevojan ◽  
Kristýna Žáková
Keyword(s):  
Czech Republic ◽  
Correspondence Analysis ◽  
Detrended Correspondence Analysis ◽  
Vegetation Types ◽  
Data Set ◽  
The Czech Republic ◽  
Synanthropic Vegetation ◽  
Arable Fields ◽  
Twinspan Classification ◽  
Southern Moravia

AbstractA synthesis of the alliance Eragrostion cilianensi-minoris in the Czech Republic is presented on the basis of 82 relevés including new unpublished data. A TWINSPAN classification and detrended correspondence analysis were used to identify the main vegetation types included in the alliance Eragrostion cilianensi-minoris. A syntaxonomic revision of the data set revealed five associations of the alliance: Digitario sanguinalis-Eragrostietum minoris, Portulacetum oleraceae, Eragrostio poaeoidis-Panicetum capillaris, Cynodontetum dactyli, and Hibisco trioni-Eragrostietum poaeoidis. The latter was recently found in several arable fields in Southern Moravia (Czech Republic) and was newly characterized.

Phytosociological affiliation of Annex II species Tephroseris longifolia subsp. moravica in comparison with two related Tephroseris species with overlapping distribution

Biologia ◽  
2013 ◽  
Vol 68 (5) ◽  
Author(s):  
Katarína Hegedüšová ◽  
Iveta Škodová ◽  
Monika Janišová ◽  
Judita Kochjarová
Keyword(s):  
Related Species ◽  
Environmental Gradients ◽  
Vascular Plant ◽  
Nutrient Content ◽  
Soil Reaction ◽  
Ecological Indicator ◽  
Indicator Values ◽  
Closely Related Species ◽  
Phytosociological Relevés ◽  
Ecological Indicator Values

AbstractThe phytosociological affiliation of Tephroseris longifolia subsp. moravica, species of European importance, was studied in relation to two closely related species of the genus Tephroseris which have overlapping distribution within the Western Carpathian Mts: T. intergrifolia and T. crispa. The main aim was to compare plant communities inhabited by the three taxa, to assess the major environmental gradients responsible for variation in their distribution and to estimate ecological indicator values for Tephroseris longifolia subsp. moravica. T. longifolia subsp. moravica was recorded in nine localities in the Slovakia and Czech Republic where it occurs in very specific site conditions of ecotone habitats. Its phytosociological affiliation is restricted to grasslands of the alliances Bromion erecti and Arrhenatherion elatioris and to the ecotone vegetation between these grasslands and beech forests. T. integrifolia occurs most frequently in the Diantho lumnitzeri-Seslerion, Bromion erecti and Quercion pubescenti-petraeae alliances. T. crispa occurs predominantly in communities of the Calthion palustris alliance and Scheuchzerio-Caricetea fuscae, Mulgedio-Aconitetea and Montio-Cardaminetea classes. The major gradient responsible for variation in species composition of communities inhabited by the studied taxa was associated with moisture and nutrient content. The vascular plant-based ecological indicator values for Tephroseris longifolia subsp. moravica calculated from phytosociological relevés with its occurrence were set for light — 6, temperature — 5, continentality — 4, moisture — 5, soil reaction — 6 and nutrients — 5. We conclude that the studied taxon has intermediate relationship to the most of the studied factors in comparison with two related species, T. crispa and T. integrifolia.

scholarly journals Oak forest vegetation in the northern part of the Štiavnické vrchy Mts (Central Slovakia)

Hacquetia ◽  
2010 ◽  
Vol 9 (2) ◽  
pp. 221-238 ◽  
Author(s):  
Michal Slezák ◽  
Anna Petrášová
Keyword(s):  
Species Composition ◽  
Environmental Gradients ◽  
Soil Nutrient ◽  
Forest Vegetation ◽  
Environmental Data ◽  
Data Matrix ◽  
Soil Reaction ◽  
Oak Forest ◽  
Data Set ◽  
Phytosociological Relevés

Oak forest vegetation in the northern part of the Štiavnické vrchy Mts (Central Slovakia)The phytosociological research of the oak forest vegetation was carried out in the northern part of the Štiavnické vrchy Mts (Central Slovakia) using the standard Zürich-Montpellier approach. The data set consisting of 41 phytosociological relevés was obtained by the authors in two vegetation seasons in 2008 and 2009. The numerical classification and the ordination methods were applied to determine the main vegetation types and to explain the structure of the vegetation-environmental data matrix, respectively. Four associations within two classes were distinguished:Luzulo albidae-Quercetum petraeaeHilitzer 1932, typical for shallow, mineral-poor and acidic soils,Melico uniflorae-Quercetum petraeaeGergely 1962 occuring on mesic stands with skeletal and deeper soils,Poo nemoralis-Quercetum dalechampiiŠomšák et Háberová 1979 developing on moderately canopyopened stands in the submontane belt,Sorbo torminalis-QuercetumSvoboda ex Blažková 1962 growing on moderately acidic substrates in drier regions. The major environmental gradients responsible for variation in forest species composition was associated with soil nutrient and soil reaction following the Ellenberg indicator values as well as the measured environmental variables (C/N-ratio and soil acidity). Special attention was given to the discussion on species composition and site ecology.

Spatial modelling-based approach to phytogeographical regionalization using grassland vegetation data

2012 ◽  
Vol 7 (2) ◽  
pp. 318-326
Author(s):  
Tomáš Hlásny ◽  
Ingrid Turisová
Keyword(s):  
Floristic Composition ◽  
Spatial Modelling ◽  
Mean Value ◽  
Ecological Indicator ◽  
Indicator Values ◽  
Grassland Vegetation ◽  
Classification Analysis ◽  
Study Region ◽  
Spatial Continuity ◽  
Sample Data

AbstractWe presented a methodology for drawing continuous boundaries in the landscape differentiating between regions with different floristic composition. A region in Central Slovakia covering 2,445 km2 was investigated. Ecological indicator values for temperature (EIT) in 1,978 grassland polygons were analysed. Ordinary kriging was used to interpolate EIT across the study region. Lattice wombling was used to identify the most intensive gradients in EIT and to draw boundaries, while ANOVA was used for post-classification analysis. A strong pattern of spatial continuity was present in EIT assigned to species in grassland polygons allowing for drawing continuous boundaries in the landscape. The study region was divided into 15 districts using the proposed method. Post-classification analysis indicated that 17 out of 23 adjacent districts were found to differ significantly in term of mean value of source samples. The results implied the need for incorporating spatial autocorrelation in sample data into post-classification analysis; such factor is often neglected in ecological research. The presented findings suggested broader applicability of the proposed method for spatial modelling, as vegetation data is widely accessible in databases for many regions of Europe.

scholarly journals The potential for misleading correlations in single-factor analysis of complex gradients

Web Ecology ◽  
2009 ◽  
Vol 9 (1) ◽  
pp. 77-81 ◽  
Author(s):  
W.-M. He ◽  
R. M. Callaway
Keyword(s):  
Environmental Gradient ◽  
Gradient Analysis ◽  
Environmental Gradients ◽  
Relative Importance ◽  
Single Factor ◽  
Factor Analyses ◽  
Data Set ◽  
Vegetation Science ◽  
Ecological Patterns ◽  
Single Factor Analysis

Abstract. Gradient analysis is an important tool for describing patterns in ecology. Natural environmental gradients are complex combinations of factors, suggesting that gradientsshould, when possible, be analyzed in multi-factorial ways. We searched papers published in Ecology, Global Change Biology, Journal of Ecology, Oecologia, Oikos, and Journal of Vegetation Science from January 2001 to December 2005, and found 133 papers matching two keywords: “gradient analysis” and “environmental gradient”. Of these, 86 utilized single-factor correlation analyses between ecological entities and natural environmental gradients. Thus the use of single-factor correlations in studies of natural environmental gradients is widespread despite the potential of this approach to overemphasize the importance of the particular factor chosen. We reanalyzed a data set from the literature, provided a example of contrasting analyses, and analyzed our own data with both single- and multiple-factor analyses to demonstrate how single-factor correlation can result in correlations that provide incomplete analysis. Integrated multi-factor approaches to studying natural environmental gradients cannot solve all analytical problems when two or more important variables are correlated, but are likely to better test the relative importance of factors driving ecological patterns.

scholarly journals Syntaxonomy and ecology of forest vegetation in the Štiavnické vrchy Mts (Central Slovakia)

2011 ◽  
Vol 80 (2) ◽  
pp. 115-127 ◽  
Author(s):  
Michal Slezák ◽  
Katarína Hegedüšová ◽  
Dušan Senko
Keyword(s):  
Environmental Gradients ◽  
Nutrient Content ◽  
Distribution Patterns ◽  
Forest Vegetation ◽  
Environmental Drivers ◽  
Vegetation Types ◽  
Numerical Classification ◽  
Data Set ◽  
Alder Forest ◽  
Forest Species Composition

Vegetation of deciduous forests in the Štiavnické vrchy Mts (Central Slovakia) was studied using the standard Zürich-Montpellier approach. The numerical classification and ordination technique were applied to determine the main forest vegetation types and to find the responsible environmental drivers related to their distribution patterns, respectively. The data set including 198 relevés collected by authors in 1997-2009 and 185 relevés excerpted from literature was used to analysis. Numerical classification resulted in delimitation of fourteen vegetation types representing eleven associations with two variants and two communities within the Quercetea robori-petraeae and Querco-Fagetea classes. The major environmental gradients in variation of forest species composition were associated with moisture and nutrient content following the average Ellenberg indicator values. Along the moisture gradient, vegetation types were ordered from subxerophilous oak forests turn mesophilous mixed oak-hornbeam, beech and ravine forests to hygrophilous riparian alder forest. The results confirmed important role of soil nutrients and moisture by determination of forest vegetation in subcontinental part of Central Europe. Special attention was given to the discussion of floristical characteristics, site conditions and syntaxonomy.

Influence of sample quantification and taxonomic resolution on the ordination of macroinvertebrate communities from running waters in Victoria, Australia

1995 ◽  
Vol 46 (2) ◽  
pp. 501 ◽  
Author(s):  
R Marchant ◽  
LA Barmuta ◽  
BC Chessman
Keyword(s):  
Binary Data ◽  
Environmental Gradients ◽  
Detrended Correspondence Analysis ◽  
Original Data ◽  
Taxonomic Resolution ◽  
Data Sets ◽  
Running Waters ◽  
Macroinvertebrate Communities ◽  
Data Set ◽  
Sample Quantification

The influence of sample quantification and taxonomic resolution on the ordination of macroinvertebrate communities from nine Victorian rivers was examined by progressively reducing the degree of detail in the original data (species level, quantitative). Five additional data sets were created that consisted of binary (presence or absence) data on species, quantitative or binary data on families, and quantitative data on PET (plecopteran, ephemeropteran and trichopteran) species or families. Ordinations were performed with detrended correspondence analysis (DCA) and semi-strong hybrid multi-dimensional scaling (SSH). With both ordination techniques, the ordinations of each data set (including the original) revealed the same three underlying gradients. An altitudinal gradient consistently achieved the highest correlations with the ordinations (r = 0.71-0.93), followed by a substratum gradient (r = 0.50-0.88) and a combined pH and conductivity gradient (r = 0.47-0.76). Each of the five less-complete data sets thus provides an adequate degree of detail for ordination analysis and subsequent interpretation of environmental gradients.

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