25 Result(s)
within
Johannes Kollmann
English
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Article
Open AccessSummer rain and wet soil rather than management affect the distribution of a toxic plant in production grasslands
In the northern forelands of the Alps, farmers report an increase of Jacobaea aquatica in production grasslands. Due to its toxicity, the species affects grassland productivity and calls for costly control measur...
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Article
Open AccessIncreased brick ratio in urban substrates has a marginal effect on tree saplings
From construction and demolition of buildings, brick wastes accumulate in large quantities and are difficult to recycle. Re-using bricks as planting substrate could partly substitute gravel or other raw materi...
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Article
Open AccessPlant species composition and local habitat conditions as primary determinants of terrestrial arthropod assemblages
Arthropods respond to vegetation in multiple ways since plants provide habitat and food resources and indicate local abiotic conditions. However, the relative importance of these factors for arthropod assembla...
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Article
Open AccessUsing crushed waste bricks for urban greening with contrasting grassland mixtures: no negative effects of brick-augmented substrates varying in soil type, moisture and acid pre-treatment
Ecological restoration aims at supporting biodiversity and ecosystem services, and urban greening is a great opportunity to achieve this goal. This is facilitated by species-rich seed mixtures based on local p...
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Article
Open AccessPlant richness, land use and temperature differently shape invertebrate leaf-chewing herbivory on plant functional groups
Higher temperatures can increase metabolic rates and carbon demands of invertebrate herbivores, which may shift leaf-chewing herbivory among plant functional groups differing in C:N (carbon:nitrogen) ratios. B...
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Open AccessCompetitive trait hierarchies of native communities and invasive propagule pressure consistently predict invasion success during grassland establishment
Invasive non-native plants challenge ecosystems restoration, and understanding the factors that determine the establishment of invasive plants is crucial to improve restoration outcomes. However, the drivers o...
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Article
Mix and match: regional admixture provenancing strikes a balance among different seed-sourcing strategies for ecological restoration
One of the main questions in ecosystem restoration is where to obtain the seeds to re-establish plant communities. While the most commonly advocated approach is to use seeds from local sources, some experts ar...
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Article
Managing plant species diversity under fluctuating wetland conditions: the case of temporarily flooded depressions
Temporarily flooded depressions in arable fields support populations of specialised plant species that are affected by flooding and agricultural management. Depending on the degree of flooding, different propo...
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Article
Setting Priorities for Monitoring and Managing Non-native Plants: Toward a Practical Approach
Land managers face the challenge to set priorities in monitoring and managing non-native plant species, as resources are limited and not all non-natives become invasive. Existing frameworks that have been prop...
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Speed restoration of EU ecosystems
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Article
Ecological literacy and beyond: Problem-based learning for future professionals
Ecological science contributes to solving a broad range of environmental problems. However, lack of ecological literacy in practice often limits application of this knowledge. In this paper, we highlight a cri...
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Article
Conceptual Frameworks and Methods for Advancing Invasion Ecology
Invasion ecology has much advanced since its early beginnings. Nevertheless, explanation, prediction, and management of biological invasions remain difficult. We argue that progress in invasion research can be...
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Article
Clonal Re-Introduction of Endangered Plant Species: The Case of German False Tamarisk in Pre-Alpine Rivers
The scope of re-introduction as a measure for plant species protection is increasing, but as long as no standardized methods are available, species-specific assessments are necessary to determine whether seeds...
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Article
Are plant populations in expanding ranges made up of escaped cultivars? The case of Ilex aquifolium in Denmark
Rapid range expansions are becoming more prevalent, especially as climate continues to change. The escape of ornamental plants within their native range represents a significant, but often overlooked component...
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Article
Impact assessment revisited: improving the theoretical basis for management of invasive alien species
The theoretical underpinnings of the assessment of invasive alien species impacts need to be improved. At present most approaches are unreliable to quantify impact at regional scales and do not allow for compa...
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Article
Low genetic diversity in small peripheral populations of a rare European tree (Sorbus torminalis) dominated by clonal reproduction
Analysis of nuclear microsatellites in six small populations of Sorbus torminalis on its northern distribution limit was carried out to evaluate the dominating mode of reproduction as well as genetic diversity wi...
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Little evidence for negative effects of an invasive alien plant on pollinator services
Many invasive alien plants occur in large populations with abundant flowers which are highly attractive to pollinators, and thus might affect pollination of co-occurring native species. This study focuses on t...
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Article
Limiting factors for seedling emergence and establishment of the invasive non-native Rosa rugosa in a coastal dune system
The relative importance of seed, habitat and microhabitat limitation has rarely been investigated for invasive non-native species, although this is critical for their effective management and for predicting fu...
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Article
Conservation and Utilisation of Abies guatemalensis Rehder (Pinaceae) – An Endangered Endemic Conifer in Central America
This is the first review on taxonomy, morphology, ecology, conservation and utilisation of Abies guatemalensis, an endangered endemic conifer in Central America. The species became recently split up in seven vari...
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Article
Population structure of a fleshy-fruited species at its range edge – the case of Prunus mahaleb L. in northern Switzerland
Kollmann J. and Pflugshaupt K. 2005. Population structure of a fleshy-fruited species at its range edge – the case of Prunus mahaleb L. in northern Switzerland. Bot. Helv. 115: 49–61.
