Erik Welk

Erik Welk
Martin Luther University Halle-Wittenberg | MLU · Institute of Biology

PhD

About

139
Publications
72,944
Reads
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3,673
Citations
Additional affiliations
July 2006 - present
Martin Luther University Halle-Wittenberg
Position
  • Research Assistant
Description
  • Phytochorology, or plant chorology, is a specialized branch of Geobotany concerned with the recording, mapping, and investigation of geographic distribution patterns of species and other taxa of the plant kingdom.

Publications

Publications (139)
Article
Full-text available
A novel chorological data compilation for the main European tree and shrub species is presented. This dataset was produced by combining numerous and heterogeneous data collected from 20th century atlas monographs providing complete species distribution maps, and from more recent national to regional atlases, occurrence geodatabases and scientific l...
Article
Full-text available
Native seeds – opportunity or risk for biodiversity conservation? A thesis paper on the implementation of § 40 BNatSchG According to § 40 BNatSchG, since March 2020 only plants that “have their genetic origin in the area concerned” may be spread in the wild. This article discusses possibilities for implementing this regulation with regard to the...
Chapter
Dieser Teil des Buches enthält die dichotomen Schlüssel, mit deren Hilfe schrittweise nahezu alle in Deutschland vorkommenden Gefäßpflanzen (Farn- und Samenpflanzen) als auch die äußerlich den Gefäßpflanzen ähnlichen Armleuchteralgen (Characeae) bestimmt werden können. Hierbei haben Benutzerinnen und Benutzer die Möglichkeit, auf verschiedenen Eben...
Book
Mit der komplett überarbeiteten Neuauflage dieser seit Jahrzehnten bewährten und ständig aktualisierten Exkursionsflora können Gefäßpflanzen und nun erstmals auch Armleuchteralgen sicher bestimmt und Wissenswertes über ihre Verbreitung, Ökologie und Soziologie nachgeschlagen werden. Besondere Vorzüge des Werkes sind: • Bestimmungshilfen auch für...
Article
Full-text available
Aim Plant functional traits summarize the main variability in plant form and function across taxa and biomes. We assess whether geographic range size, climatic niche size, and local abundance of plants can be predicted by sets of traits (trait syndromes) or are driven by single traits. Location Eurasia Methods Species distribution maps were extrac...
Article
Full-text available
Aim This work explores whether the commonly observed positive range size–niche breadth relationship exists for Fagus, one of the most dominant and widespread broad‐leaved deciduous tree genera in temperate forests of the Northern Hemisphere. Additionally, we ask whether the 10 extant Fagus species’ niche breadths and climatic tolerances are under p...
Article
Motivation Detailed knowledge on the climatic tolerances of species is crucial to understand, quantify and predict the impact of climate change on biodiversity and ecosystem functions. However, quantitative data are limited; often, only expert‐based qualitative estimates are available. With the ClimPlant database, we capitalize on the link between...
Article
Full-text available
Aim: This work explores whether the commonly observed positive range size–niche breadth relationship exists for Fagus, one of the most dominant and widespread broad-leaved deciduous tree genera in temperate forests of the Northern Hemisphere. Additionally, we ask whether the 10 extant Fagus species’ niche breadths and climatic tolerances are under...
Article
Full-text available
We analyzed the global genetic variation pattern of Capsella bursa‐pastoris (Brassicaceae) as expressed in allozymic (within‐locus) diversity and isozymic (between‐locus) diversity. Results are based on a global sampling of more than 20,000 C. bursa‐pastoris individuals randomly taken from 1,469 natural provenances in the native and introduced rang...
Article
Full-text available
Aim: A fundamental question in macroecology centres around understanding the relationship between species’ local abundance and their distribution in geographical and climatic space (i.e. the multi-dimensional climatic space or climatic niche). Here, we tested three macroecological hypotheses that link local abundance to the following range properti...
Article
Full-text available
Aim: A fundamental question in macroecology centres around understanding the relationship between species’ local abundance and their distribution in geographical and climatic space (i.e. the multi-dimensional climatic space or climatic niche). Here, we tested three macroecological hypotheses that link local abundance to the following range properti...
Article
Full-text available
Background: The Biological Field Station of Paimpont (Station Biologique de Paimpont, SBP), owned by the University of Rennes and located in the Brocéliande Forest of Brittany (France), has been hosting student scientific research and field trips during the last 60 years. The study area of the SBP is a landscape mosaic of 17 ha composed of gorse m...
Article
The Mongolian share of the Palaearctic steppe biome hosts some of most intact grassland regions, these are traversed by high peaks creating diverse and rich habitats. We sampled 100 randomly located vegetation plots in a 2 × 2 km² mountain summit region that is isolated by surrounding drier lowlands in the Gobi Gurvan Saykhan mountain range in sout...
Article
Full-text available
Geographic plant distribution is often assumed to be predominantly limited directly by the climatic tolerances of species. However, the role of climate is nowadays known to be mainly an indirect one by mostly mediating dispersal and establishment, species interactions or habitat characteristics, which all are often modified by human land use. In th...
Article
Aim Biodiversity databases are valuable resources for understanding plant species distributions and dynamics, but they may insufficiently represent the actual geographic distribution and climatic niches of species. Here we propose and test a method to assess sampling coverage of species distribution in biodiversity databases in geographic and clima...
Article
Full-text available
Carex liparocarpos s. str. was first recorded for Germany in 2017 by Albert Oesau in the NSG Lennebergwald near Mainz. This new finding is described and discussed in terms of the general distribution range and the species' range wide occurrence in plant communities. The new data compilation reveals numerous interesting facts, yet many crucial quest...
Chapter
The mainly terrestrial Ferns and Flowering plants are representing the main part of the terrestrial biomass, even if they are less species-rich compared to other groups of animals or fungi. They dominate the vegetation and therefore, the habitats of other plants, animals, and fungi as well as the appearance of natural and cultural landscapes. Espec...
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
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 q...
Article
Full-text available
Biodiversity experiments have shown that species loss reduces ecosystem functioning in grassland. To test whether this result can be extrapolated to forests, the main contributors to terrestrial primary productivity, requires large-scale experiments.We manipulated tree species richness by planting more than 150,000 trees in plots with 1 to 16 speci...
Article
Full-text available
The relationship between species’ niche breadth (i.e. the range of environmental conditions under which a species can persist) and range size (i.e. the extent of its spatial distribution) has mostly been tested within geographically restricted areas but rarely at the global extent. Here, we not only tested the relationship between range size (deriv...
Article
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 q...
Article
Full-text available
Biodiversity–ecosystem functioning (BEF) research has extended its scope from communities that are short-lived or reshape their structure annually to structurally complex forest ecosystems. The establishment of tree diversity experiments poses specific methodological challenges for assessing the multiple functions provided by forest ecosystems. In...
Preprint
Forest ecosystems contribute substantially to global terrestrial primary productivity and climate regulation, but, in contrast to grasslands, experimental evidence for a positive biodiversity-productivity relationship in highly diverse forests is still lacking ¹ . Here, we provide such evidence from a large forest biodiversity experiment with a nov...
Poster
Full-text available
The Shepherd‘s Purse Capsella bursa-pastoris (Brassicaceae) is mostly summer- or winter annual, tetraploid and predominantly inbreeding.There is evidence that this species originated in Eurasia and subsequently colonized other regions of the world. C. bursa-pastoris spreaded successfully into almost all man-made habitats. The aims of our study are...
Article
Full-text available
Herbivores and fungal pathogens are key drivers of plant community composition and functioning. The effects of herbivores and pathogens are mediated by the diversity and functional characteristics of their host plants. However, the combined effects of herbivory and pathogen damage, and their consequences for plant performance, have not yet been add...
Article
Full-text available
Correlative species distribution models are based on the observed relationship between species’occurrence and macroclimate or other environmental variables. In climates predicted less favourable, populations are expected to decline, and in favourable climates they are expected to persist. However, little comparative empirical support exists for a r...
Data
The data are organized as a set of ESRI shapefiles (*.shp, *.shx, *.dbf, *.prj files) mapping the distribution ranges of the main European tree and shrub species. For each species, and in some cases subspecies, one or more shapefiles have been created containing: a) polygon features (name suffix “plg”), which define continuous areas of occupancy of...
Article
Full-text available
Questions Misunderstandings and methodological inconsistencies have hampered the applicability of Ellenberg's biogeographical indicator values for continentality. To redefine the indicator values we focused on the following questions: What is meant by phytogeographical continentality as the basic principle behind Ellenberg’s indicator values for co...
Article
Full-text available
Climate change, land-use change, pollution and exploitation are among the main drivers of species’ population trends; however, their relative importance is much debated. We used a unique collection of over 1,000 local population time series in 22 communities across terrestrial, freshwater and marine realms within central Europe to compare the impac...
Article
Aims Genetic variation in plant traits represents the raw material for future adaptive evolution. Its extent can be estimated as heritability based on the performance of experimental plants of known relatedness, such as maternal half-sib seed families. While there is considerable heritability information for herbaceous plants and commercially impor...
Article
Full-text available
Impacts of climate change on individual species are increasingly well documented, but we lack understanding of how these effects propagate through ecological communities. Here we combine species distribution models with ecological network analyses to test potential impacts of climate change on 4700 plant and animal species in pollination and seeddi...
Data
Supplementary Figures and Supplementary Tables
Data
Network metrics, climatic niche breadth and climatic suitability change. For 295 plant and 414 animal species, we provide information on plant and animal taxonomy (class, order, family), the effective number of interaction partners, complementary specialization d' (uniqueness of interaction partners relative to other species [range 0-1]), range siz...
Data
Metadata of 13 mutualistic networks. Given are network type, geographic location, habitat type, sampling duration and the number of visitation events, plant and animal species in each network. We only included species in the networks for which occurrence data were available and provide the number of excluded plant and animal species for the study t...
Chapter
Der Gebrauch der Bestimmungstabellen unterscheidet sich grundsätzlich kaum von der Verwendung im Rothmaler-Grundband. Für eine sichere Bestimmung sind normal entwickelte, blühende Pflanzen erforderlich, in einigen Pflanzengruppen auch Früchte. Ferner können Grundblätter und unterirdische Organe wichtig sein. Entsprechende spezielle Hinweise finden...
Chapter
Aufsammlungen sind für die Arbeit mit bestimmungskritischen Sippen von besonderer Bedeutung. Oft erfordert schon die Erhebung der Merkmale, dass umfangreiches Material entnommen werden muss. Die Bestimmungsergebnisse sollten zudem in kritischen Fällen abgesichert werden, indem Material an Spezialisten geschickt oder die eigene Aufsammlung mit siche...
Chapter
Soweit bekannt und verfügbar, steht bei den Arten und Unterarten hinter den Schlüsselmerkmalen und einzelnen zusätzlichen Merkmalen zunächst die durchschnittliche Höhe der ausgewachsenen Pflanze in Metern (0,03–0,15 = 3–15 cm hoch). Bei liegenden oder kriechenden Pflanzen bezieht sich die Angabe auf die Länge (meist mit lg bezeichnet). Manchmal sin...
Chapter
Alle Pflanzenarten und in der Regel auch die Unterarten besiedeln ein charakteristisches, ihren Umweltansprüchen entsprechendes Verbreitungsgebiet, das Areal. Für viele der in diesem Band behandelten Arten ist eine relativ junge, oft nacheiszeitliche Entstehung zu vermuten. Doch resultieren daraus nicht unbedingt kleine Areale; Apomixis führt sogar...
Chapter
Unter den verschlüsselten Arten sind viele seltene; auch gibt es Arten, die nachweisbar durch den rasanten Landnutzungswandel in Deutschland zurückgehen. Daher werden hier einige Angaben zu Naturschutzaspekten im Hinblick auf bestimmungskritische Sippen gemacht. Besorgniserregend ist dabei, dass unter den seltenen oder bedrohten Arten auch solche s...
Chapter
Da sich ihre ökologischen Ansprüche überlappen, treten Pflanzenarten oft miteinander vergesellschaftet auf. Wo ähnliche Standortbedingungen herrschen, wiederholen sich die vorkommenden Artengemeinschaften. Derartige Pflanzenbestände ähnlichen Typs werden als Pflanzengesellschaften bezeichnet. Sie sind durch eine charakteristische, also relativ rege...
Chapter
Im Hinblick auf die für bestimmungskritische Sippen typischen Kenntnislücken zur Ökologie und Verbreitung mag es überraschend sein, dass im Text numerische Angaben zum ökologischen Verhalten von Arten erwähnt werden. Tatsächlich sind aber auch in einigen kritischen Artengruppen solche Angaben schon seit längerem verfügbar und können als belastbar g...
Article
Die Art (Species) ist die biologisch wichtigste Einheit im taxonomischen System und auch die zentrale Einheit in diesem Buch. In den meisten Definitionen gilt sie als eine Abstammungsgemeinschaft (Sippe) von Individuen, die untereinander fertil kreuzbar sind. Sonderfälle sind allerdings im Pflanzenreich ziemlich häufig und in vielen Gruppen sogar d...
Chapter
Die in den Bestimmungsschlüsseln verwendeten Fachausdrücke zur Beschreibung des Baues der Pflanzen werden in der vorliegenden Auflage am Ende des Buches in einem alphabetischen illustrierten Fachwortverzeichnis erklärt. Damit soll das Auffinden der Begriffe erleichtert werden. In diesem Kapitel werden die Grundlagen der Biologie der Pflanzen ausfüh...
Article
Full-text available
Evaluating the consequences of the decline of threatened species on their population genetic structure is crucial for establishing effective conservation strategies in the strongly fragmented landscapes of Central Europe. Laserpitium prutenicum is a bi- to perennial forb occurring in intermittently wet meadows and light oak forests throughout centr...
Article
Full-text available
The use of DNA sequence data in plant systematics has brought us closer than ever to formulating well-founded hypotheses about phylogenetic relationships, and phylogenetic research keeps on revealing that plant genera as traditionally circumscribed often are not monophyletic. Here, we assess the monophyly of genera documented in Rothmaler's "Exkurs...
Chapter
Full-text available
Sorbus aria (L.) Crantz or common whitebeam (syn. Aria nivea) is a medium sized deciduous tree or shrub, characterised by white small flowers arranged in inflorescences, which develop lenticel-speckled reddish pomes. It is a mountain species of southern, western and central Europe, occurring mainly in openings and at the edges of European limestone...
Chapter
Full-text available
The wild service tree (Sorbus torminalis (L.) Crantz) is a fast-growing, light-demanding, clonally resprouting forest tree of disturbed forest patches and forest edges. It is widely distributed in southern, western and central Europe, but is a weak competitor that rarely dominates forests and never occurs in pure stands. The wild service tree is ab...
Book
Full-text available
The European Atlas of Forest Tree Species is the first comprehensive publication of such a unique and essential environmental resource, that is, our trees. Leading scientists and forestry professionals have contributed in the many stages of the production of this atlas, through the collection of ground data on the location of tree species, elaborat...
Chapter
Full-text available
Prunus avium (L.) L., known as wild cherry, is a medium sized, fast growing and rather short-lived deciduous tree. The wild populations, described here, belong to the typical subspecies avium, whereas the cultivated forms are distinguished as subsp. duracina and subsp. juliana. The early large white flowers are clustered on spur shoots and give ris...
Article
Full-text available
Future global change scenarios predict a dramatic loss of biodiversity for many regions in the world, potentially reducing the resistance and resilience of ecosystem functions. Once before, during Plio-Pleistocene glaciations, harsher climatic conditions in Europe as compared to North America led to a more depauperate tree flora. Here we hypothesiz...
Data
Species distribution data: processing and references. (DOCX)
Data
Analyses for the temperate zone according to the Koeppen-Geiger classification. (DOCX)
Data
Environmental heterogeneity analyses. (DOCX)
Data
Analyses without restriction to the temperate zone. (DOCX)
Data
Additional information on the PCoA—analyses. (DOCX)
Data
Permission to use data from third parties under CC BY 4.0. (DOCX)
Data
Functional Richness analyses. (DOCX)
Data
Trait data from open sources. (XLSX)
Book
Dieser neu konzipierte Kritische Ergänzungsband erweitert Grund- und Atlasband der Rothmaler-Exkursionsflora und ermöglicht die Bestimmung von ca. 700 Sippen aus bestimmungskritischen Pflanzengattungen der deutschen Flora. Anerkannte Experten konnten für die Bearbeitung der folgenden Gruppen gewonnen werden: Ranunculus auricomus (Goldschopf-Hahnen...
Data
Plot data. Table S2. Tree species data.
Article
Full-text available
While functional diversity (FD) has been shown to be positively related to a number of ecosystem functions including biomass production, it may have a much less pronounced effect than that of environmental factors or species-specific properties. Leaf and wood traits can be considered particularly relevant to tree growth, as they reflect a trade-off...