Dokumente Fakultät für Biologie und Psychologie (inkl. GAUSS) nach Gutachter "Scheu, Stefan Prof. Dr."
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Ecological groups of Collembola in agroecosystems as affected by farm-based management practices
(2022-12-15)Present day agriculture is identified as a main threat to biodiversity. At the same time, the productivity of agricultural systems is relying on ecosystem services provided by biota. In order to conserve critical ecosystem ... -
Spider food webs: influence of cropping cycle and landscape heterogeneity in Philippine rice ecosystems
(2022-04-14)Rice is the most important staple crop of the world, providing approximately 19% of the world population’s caloric uptake and being cultivated on 163 million ha. Rice provides food and income to an estimated 200 million ... -
The Evolution of the Australian Amitermes group
(2022-04-05)Although the Australian Amitermes Group (AAG) is the most diverse and speciose group of higher termites (Termitidae) in Australia, relatively little is known about the origin and evolution of the group. Recent phylogenetic ... -
Soil protists in tropical systems: From morphological variation to trophic groups
(2022-03-17)In the studies of this thesis, I used two different approaches to shed light on soil protist diversity and ecology in two tropical regions, the montane rainforest of Southern Ecuador and the lowland rainforest of Sumatra, ... -
Soil fauna in lowland rainforest and agricultural systems of Sumatra: Changes in community composition and trophic structure with focus on Collembola
(2022-02-17)Rainforest conversion to agricultural plantations such as rubber and oil palm in Indonesia is increasing in the last decades. In this thesis, I investigated effects of rainforest conversion to rubber and oil palm plantations ... -
Effects of cold stress on reproductive biology and epigenetic profiles of the alpine plant Ranunculus kuepferi (Ranunculaceae)
(2022-01-17)Alpine habitats are shaped by harsh abiotic conditions and cold climates. Plant life in such habitats is challenging, as environmental influence can alter the conditions for development and reproduction. More specifically, ... -
Community structure and guild patterns of soil decomposers in pure and mixed forests of European beech, Norway spruce and Douglas fir
(2021-10-28)Anthropogenic global warming is creating new challenges for forest management in many parts of the world. One vital aspect is the choice of tree species and whether to cultivate monospecific or mixed timber plantations. ... -
Ploidy-dependent effect of prolonged photoperiod on mode of reproduction and photosynthesis in the Ranunculus auricomus complex (Ranunculaceae)
(2021-07-23)Polyploidy, whole-genome duplication, enhances stress-tolerance to drastic environmental compared to their diploid progenitor by enabling more extensive adaptation as advantages of gene and genome duplication. Polyploidy ... -
The role of root-derived carbon in trophic interactions within soil food webs as indicated by analyses of stable isotope, lipids and amino acids in microarthropods (collembola)
(2021-07-12)A considerable amount of photosynthates is released into soil via living roots as rhizodeposits. This root-derived carbon (C) is an important source of energy and nutrients for microorganisms and higher trophic levels in ... -
The role of plant diversity, plant functional groups, and mineral nitrogen for soil microbial functioning and soil mesofauna in temperate grassland
(2021-03-16)Soil-derived ecosystem functions such as decomposition and element cycling are crucial for ecosystem services such as production of food, fodder and biofuels; in short, they are essential prerequisites for human and animal ... -
Impacts of leaf litter diversity and root resources on microorganisms and microarthropods (Acari, Collembola) during early stages of decomposition in tropical montane rainforest ecosystems
(2021-03-04)Soil organisms influence organic matter turnover and nutrient cycling via processing of organic matter entering the soil as litter and root-derived resources. Plant species differ enormously in the quality and quantity of ... -
A short story: senescence in an annual reptile, Labord’s chameleon (Furcifer labordi)
(2020-12-10)Among animals, the fast-slow continuum is the dominant axis that shapes life-history variation. As resources are limited a trade-off occurs between a short lifespan, young age at maturity, high reproductive rates and high ... -
Impact of rainforest conversion: How prokaryotic communities respond to anthropogenic land use changes
(2020-12-03)In this thesis, the impact of rainforest conversion to the managed land use systems jungle rubber, rubber plantation and oil palm plantation on structure and function of soil microbial communities was investigated. The ... -
No sex, No problem? Mutation accumulation in asexual animals
(2020-07-03)According to classical predictions, sex is beneficial because it allows for purging of slightly deleterious mutations via effective purifying selection. In asexual organisms mutational load increases over time, eventually ... -
Compositional and functional shifts in belowground fungal communities in tropical land-use systems
(2020-06-23)Tropical low-land rainforests are one of the most diverse ecosystems in the world and provide valuable ecosystem services such as climate change mitigation. They are immensely threatened by expanding human land-use. ... -
Reproductive strategies of alpine apomictic plants under different ecological conditions
(2019-06-06)The origin of apomixis in natural populations is still not well understood. Apomictic plants tend to expand their distribution range more to higher latitudes and altitudes compared to their sexual progenitors, a phenomenon ... -
The effect of the mycorrhizal type on root-rhizosphere interactions in AM and ECM tree species: field studies and mesocosm experiments
(2019-02-20)Based on the two main types of mycorrhizal associations in temperate forests, which are arbuscular (AM) and ectomycorrhiza (ECM), the idea of a mycorrhizal-associated nutrient economy framework developed (Phillips et al., ... -
Habitat selection, cryptic diversity, phylogeny, and phylogeography of the European Lepidocyrtus lanuginosus species group (Collembola: Entomobryidae)
(2019-02-12)Accurate species identification and assessment of species diversity are essential for studies on phylogeny and phylogeography, adaptation and ecological function. The development of molecular methods triggered the discovery ... -
Volatile-mediated arthropod-fungus interactions
(2019-01-24)Fungi are considered as main decomposers in terrestrial ecosystems and, due to their diverse lifestyles, engaged in a plethora of interactions with soil invertebrates. Determining the underlying mechanisms that regulate ... -
Fatty acid patterns of soil decomposers and predators as affected by plant species richness
(2018-05-24)Relationships between organisms in the soil are very important to control the equilibrium of an ecosystem. Many factors and conditions play a crucial role for the development and functioning of decomposers and predators, ...