Dokumente Fakultät für Biologie und Psychologie (inkl. GAUSS) nach Gutachter "Kreft, Holger Prof. Dr."
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Cytotype Associations, Ecological Divergence and Genetic Variation in the Apomictic Complex Paspalum intermedium Munro Ex Morong (Poaceae)
(2019-02-19)Polyploidization (whole genome duplication – WGD) is a recurrent process in plants and provides greater potential for diversification. Neopolyploids in natural populations should go under substantial structural changes in ... -
Diversity and Trophic Ecology of Arboreal Spider (Araneae) Assemblages along a Transformation Gradient from Lowland Rainforest to Oil Palm Plantations in Jambi Province, Sumatra, Indonesia
(2023-03-02)In chapter 2, I investigated the canopy spider abundance, biomass, richness and community composition across a land-use gradient from tropical lowland rainforest via jungle rubber to monocultures of rubber and oil palm. ... -
Diversity, composition, and biogeography of trees in tropical mountain forests of Sulawesi, Indonesia
(2019-10-28)Human activities are increasingly threatening the integrity of Earth’s ecosystems. For successful conservation measures, one necessary prerequisite is an adequate level of understanding about the ecosystems and their ... -
Ecological analysis of large floristic and plant-sociological datasets – opportunities and limitations
(2018-05-07)This thesis comprises opportunities and limitations for the analysis of floristic and plant-sociological datasets and presents four related exemplary case studies. Woody plant species, their isolated metapopulations and ... -
Epiphyte diversity and microclimate of the tropical lowland cloud forest in French Guiana
(2013-11-06)Lowland cloud forests are well known from temperate regions, e.g. the coasts of California and northern Chile (Bruijnzeel 2001), but in the Tropics have remained uninvestigated. We tested the hypothesis that tropical ... -
Evolution of Melicope J.R.Forst & G.Forst (Rutaceae), the largest adaptive radiation of woody plants on the Hawaiian Islands.
(2020-11-27)Adaptive radiation describes the divergence of an ancestral taxon into multiple, phenotypically diverse species, adapted to a range of ecological niches by means of natural selection. The process is recognized as a fundamental ... -
Feeding Interactions and Their Relevance to Biodiversity under Global Change
(2017-03-21)This dissertation focuses on the effect of multiple global change drivers on feeding interaction strength and biodiversity loss. The mechanisms of their influences on food webs are demonstrated by simple food chain motifs ... -
Holocene Vegetation and Disturbance Dynamics in the Araucaria araucana Forest: a paleoecological contribution for conservation
(2020-07-15)Climatic changes have changed the vegetation distribution in northern Patagonia over millennial time-scale; while, fire and volcanoes disturbance might play an important role in the vegetation dynamics, especially in the ... -
Holocene vegetation and environmental changes with a focus on peat ecosystems in southwestern and northeastern Amazonia
(2024-03-27)Amazon rainforests are well-known for playing a significant role in the climate, hydrological cycle, and biodiversity on earth. Recent investigations found that Amazonia may contain the largest peat carbon (C) stock in the ... -
Land-use impacts on biodiversity and ecosystem functioning of complex multitrophic communities
(2016-02-24)Global biodiversity is rapidly declining, resulting in far-reaching impacts on the functioning of ecosystems and human wellbeing. In recent decades, anthropogenic land use has been identified as a major driver of biodiversity ... -
Palaeoecological Evidence of Ecosystem Dynamics in Sumatra, Indonesia. Case Studies of Tropical Submountains and Mangroves
(2019-07-03)The mountain and mangrove ecosystems are an important component of Sumatra’s landscape. These highly diverse ecosystems provide numerous ecological services as well as socio-economic function, but they are also sensitive ... -
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 ... -
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 ... -
Shade trees in cacao agroforestry systems: influence on roots and net primary production
(2016-09-19)Huge areas of natural forests are rapidly cleared worldwide to make way for agricultural cultivation systems. This has a substantial impact on the functioning of ecosystems, as well as on carbon cycling and hence effects ... -
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 ... -
The role of heterogeneity in spatial plant population dynamics
(2017-10-23)Ecological theory names interacting mechanisms that allow competing species to coexist in limited available space, some of them are perceive as antagonistic. Most prominent are niche differentiation, heterogeneity and ... -
The role of tree height and wood density for the water use, productivity and hydraulic architecture of tropical trees
(2020-06-24)Tropical forests are the world’s most productive terrestrial ecosystems and of central importance for global carbon and water cycles. Global climate projections predict increases in average temperature and an elevated ... -
The structure of coastal invertebrate communities and their temporal and spatial dynamics
(2022-11-22)The Wadden Sea is one of the largest tidal flats in the world, stretching across the coasts of the Netherlands, Germany and western Denmark. Along sheltered coastlines lie salt marshes which are essential habitats for a ... -
Vegetation and functional diversity of sand dune habitats between and within different bioclimatic regions
(2017-08-08)Use of plant functional types has a long tradition in ecology from the time that von Humboldt offered the first physiognomic classification of plants based on growth form. In recent years, the application of functional ...