Stephan Hennekens

Stephan Hennekens
Wageningen University & Research | WUR · Wageningen Enviromental Research

About

120
Publications
68,278
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5,148
Citations
Citations since 2016
80 Research Items
3595 Citations
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20162017201820192020202120220200400600
20162017201820192020202120220200400600
20162017201820192020202120220200400600

Publications

Publications (120)
Technical Report
The Netherlands Environmental Assessment Agency, WOT/WENR, Statistics Netherlands and the provincial authorities use indicators to identify and measure the status and trends in environmental parameters, such as plant nutrient availability, soil pH and the average groundwater levels in spring. In 2020 WENR and Jan Holtland (Holtland Advies) carried...
Article
Full-text available
Assessing biodiversity status and trends in plant communities is critical for understanding, quantifying and predicting the effects of global change on ecosystems. Vegetation plots record the occurrence or abundance of all plant species co‐occurring within delimited local areas. This allows species absences to be inferred, information seldom provid...
Article
Full-text available
The functioning of present ecosystems reflects deep evolutionary history of locally co‐occurring species if their functional traits show high phylogenetic signal (PS). However, we do not understand what drives local PS. We hypothesize that local PS is high in undisturbed and stressful habitats – either due to ongoing local assembly of species that...
Article
Full-text available
Aim The stress-gradient hypothesis (SGH) postulates that species interactions shift from negative to positive with increasing abiotic stress. Interactions between species are increasingly being recognized as important drivers of species distributions, but it is still unclear whether stress-induced changes in interactions affect continental-to-globa...
Article
Aim Vegetation types of Mediterranean thermophilous pine forests dominated by Pinus brutia, P. halepensis, P. pinaster, and P. pinea were studied in various areas. However, a comprehensive formal vegetation classification of these forests based on a detailed data analysis has never been developed. Our aim is to provide the first broad‐scale classif...
Article
Full-text available
The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019) is a regional database, which was established in 2014. It comprises phytosociological relevés covering various vegetation types from nine countries of the Balkan Peninsula (Albania – 153 relevés, Bosnia and Herzegovina – 1715, Bulgaria – 12,282, Greece – 465, Croatia – 69, Kosovo – 493, Monte...
Article
Full-text available
Aim The EUNIS Habitat Classification is a widely used reference framework for European habitat types (habitats), but it lacks formal definitions of individual habitats that would enable their unequivocal identification. Our goal was to develop a tool for assigning vegetation‐plot records to the habitats of the EUNIS system, use it to classify a Eur...
Article
Aims: i) To disentangle the global patterns of native and alien plant diversity on coastal sand dune ecosystems across habitats and floristic kingdoms, ii) to determine the main drivers of variation in species richness in native and alien species in these endangered ecosystems, and iii) to test for an interaction between spatial scale and native-al...
Article
Full-text available
The negative effect of human interference with biodiversity is well known. Unknown, however, was the major effect that human meddling has on habitat types that are rich in plant species from ancient epochs such as the Paleogene and Paleocene/Eocene and Oligocene eras. The influence is that big, also due the human interest in these habitats, that th...
Article
Aims Vegetation‐plot sampling usually involves estimating species cover. When plots are classified to vegetation types, covers are often transformed to decrease the effect of dominant species. However, it remains unclear which transformation is optimal. We suggest that for vegetation classification, optimal is such transformation as contributes to...
Article
This report presents the European Weed Vegetation Database, a new database of vegetation plots documenting short-lived vegetation of arable and ruderal habitats from Europe and Macaronesia. The database comprises the phytosociological classes Papaveretea rhoeadis, Sisymbrietea, Chenopodietea and Digitario sanguinalis-Era-grostietea minoris. It is a...
Article
To create a comprehensive, consistent and unequivocal phytosociological classification of European marsh vegetation of the class Phragmito‐Magnocaricetea. Location Europe We applied the Cocktail method to a European data set of 249 800 vegetation plots. We identified the main purposes and attributes on which to base the classification, defined assi...
Article
Full-text available
Species distribution models (SDMs) are routinely applied to assess current as well as future species distributions, for example to assess impacts of future environmental change on biodiversity or to underpin conservation planning. It has been repeatedly emphasized that SDMs should be evaluated based not only on their goodness of fit to the data, bu...
Article
Aims: Baltic Sea coastal grasslands are influenced by saline or brackish sea water, a narrow tidal range and non-intensive land use. Since their designation as Natura 2000 habitat types under the EU Habitats Directive, they have become an important conservation issue in Europe. Little supra-regional research has been conducted to date on their flor...
Book
This field guide contains a description of all plant communities (at the level of association) which are distinguished in the recently published check list of plant communities in the Netherlands. Provided are shortened synoptic tables, ecological characteristics, and distribution maps. A key is added to enable a quick identification of plant commu...
Poster
Full-text available
Baltic Sea coastal grasslands are influenced by saline or brackish sea water, a narrow tidal range and non-intensive land use. They have become an important conservation issue at European scale. So far, only little supra-regional research has been conducted. In this study, we analyse their geographical distribution, syntaxonomical variation, large-...
Article
Full-text available
Questions: Vegetation-plot records provide information on presence and cover or abundance of plants co-occurring in the same community. Vegetation-plot data are spread across research groups, environmental agencies and biodiversity research centers, and thus, are rarely accessible at continental or global scales. Here we present the sPlot database,...
Article
Full-text available
Aims: Vegetation-plot records provide information on the presence and cover or abundance of plants co-occurring in the same community. Vegetation-plot data are spread across research groups, environmental agencies and biodiversity research centers and, thus, are rarely accessible at continental or global scales. Here we present the sPlot database,...
Article
Large thematic databases of vegetation plots are increasingly needed for vegetation studies and biodiversity research. In this paper, we present the CircumMed Pine Forest Database (GIVD ID: EU-00-026), which in November 2018, comprised records from 6317 pine-dominated vegetation plots (relevés) and associated vegetation types from 20 countries of t...
Article
Full-text available
Plant functional traits directly affect ecosystem functions. At the species level, trait combinations depend on trade-offs representing different ecological strategies, but at the community level trait combinations are expected to be decoupled from these trade-offs because different strategies can facilitate co-existence within communities. A key r...
Article
We investigate whether (1) environmental predictors allow to delineate the distribution of discrete community types at the continental scale and (2) how data completeness influences model generalization in relation to the compositional variation of the modelled entities. Europe. We used comprehensive datasets of two community types of conservation...
Article
Full-text available
This report describes the Romanian Grassland Database (RGD), registered under EU-RO-008 in the Global Index of Vegetation-Plot Databases (GIVD). This collaborative initiative aims at collecting all available vegetation-plot data (relevés) of grasslands and other open habitats from the territory of Romania and providing them for science, nationally...
Article
Aims: An Arctic Vegetation Classification (AVC) is needed to address issues related to rapid Arctic-wide changes to climate, land-use, and biodiversity. Location: The 7.1 million km2 Arctic tundra biome. Approach and conclusions: The purpose, scope and conceptual framework for an Arctic Vegetation Archive (AVA) and Classification (AVC) were develop...
Technical Report
Full-text available
This projects aims at parameterising the grassland units of the revised EUNIS habitat classification across Europe. Using the comprehensive plot dataset from the European Vegetation Archive (EVA), all grassland habitats (habitat group E) of Europe (including the coastal grey dunes, habitat subgroup B1.4) are formally defined with a unanimous floris...
Article
Full-text available
Aims: Syntaxonomic classification is widely used for vegetation survey in Europe. The long history of its use has produced many concepts and names of vegetation units that need to be revised and integrated into a single classification system. Here we (1) present a new, global hierarchical syntaxonomic systems of alliances, orders, classes of the Br...
Article
Full-text available
The Alaska Arctic Vegetation Archive (AVA-AK, GIVD-ID: NA-US-014) is a free, publically available database archive of vegetation-plot data from the Arctic tundra region of northern Alaska. The archive currently contains 24 datasets with 3,026 non-overlapping plots. Of these, 74% have geolocation data with 25-m or better precision. Species cover dat...
Article
Full-text available
The Balkan Vegetation Database (BVD; GIVD ID: EU-00-019; http://www. givd. info/ID/EU-00019) is a regional database that consists of phytosociological relevés from different vegetation types from six countries on the Balkan Peninsula (Albania, Bosnia and Herzegovina, Bulgaria, Kosovo, Montenegro and Serbia). Currently, it contains 9,580 relevés, an...
Conference Paper
Full-text available
Background: Ecological indicator values (EIVs) have a long tradition in vegetation ecological research in Europe. EIVs characterise the ecological optimum of species along major environmental gradients using ordinal scales. Calculating mean indicator values per plot is an effective way of bioindication. Following first systems in Russia and Central...
Article
Full-text available
Aim Biodiversity hot-spots are regions containing evolutionary heritage from ancient or recent geological epochs, i.e. evolutionary ‘museums’ or ‘cradles’, respectively. We hypothesize that: (1) there are also ‘museums’ and ‘cradles’ within regions – some species pools of particular habitat types contain angiosperm (flowering plants) lineages from...