Rasmus Revermann

Rasmus Revermann
University of Hamburg | UHH · Institute for Plant Science and Microbiology, Department Biodiversity, Ecology and Evolution of Plants

Dr. rer. nat., Diplom in Geoecology

About

50
Publications
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623
Citations

Publications

Publications (50)
Article
Full-text available
Angola is a country in south-central Africa, particularly rich in biodiversity. Despite the efforts recently made to document its biodiversity, there is a need for standardized sampling methods to document and compare the variety of ecosystems and plants occurring in the country. With this database report we aim to document the abundance and divers...
Article
Full-text available
Despite its importance for carbon stocks accounting, belowground biomass (BGB) has seldom been measured due to the methodological complexity involved. In this study, we assess woody BGB and related carbon stocks, soil properties and human impact on two common suffrutex grasslands ( Brachystegia - and Parinari grasslands) on the Angolan Central Plat...
Article
Full-text available
Positive biodiversity‐ecosystem function relationships (BEFRs) have been widely documented, but it is unclear if BEFRs should be expected in disturbance‐driven systems. Disturbance may limit competition and niche differentiation, which are frequently posited to underlie BEFRs. We provide the first exploration of the relationship between tree specie...
Article
Full-text available
Plant species that negatively affect their environment by encroachment require constant management and monitoring through field surveys. Drones have been suggested to support field surveyors allowing more accurate mapping with just-in-time aerial imagery. Furthermore, object-based image analysis tools could increase the accuracy of species maps. Ho...
Article
The idea that tropical forest and savanna are alternative states is crucial to how we manage these biomes and predict their future under global change. Large-scale empirical evidence for alternative stable states is limited, however, and comes mostly from the multimodal distribution of structural aspects of vegetation. These approaches have been cr...
Article
Full-text available
Pterocarpus angolensis , a leguminous tree native to the dry woodlands of Southern Africa, provides valuable timber, but is threatened by land conversion and overharvesting while showing limited natural regeneration. Nitrogen-fixing root nodule symbionts that could improve establishment of young seedlings have not yet been described. Therefore, we...
Article
The miombo region in Africa is covered by a mosaic of woodlands and geoxylic grasslands and subject to disturbances like fires, frost and drought, and low nutrient availability. The dominance of Fabaceae Detarioideae species in miombo ecosystems is remarkable but little understood. We therefore compared plant functional traits (PFTs) of common wood...
Article
Significance We develop a biogeographic approach to analyzing the presence of alternative stable states in tropical biomes. Whilst forest–savanna bistability has been widely hypothesized and modeled, empirical evidence has remained scarce and controversial, and here, applying our method to Africa, we provide large-scale evidence that there are alte...
Article
Full-text available
Geoxyles and their congeneric tree species are a very common feature in the Zambezian Floristic Region, however , little is known about differing expression of plant functional traits between the two life forms and thus their evolutionary adaptations to prevailing habitat conditions. Therefore, we measured selected plant functional traits and compa...
Article
Geoxyles and their congeneric tree species are a very common feature in the Zambezian Floristic Region, however , little is known about differing expression of plant functional traits between the two life forms and thus their evolutionary adaptations to prevailing habitat conditions. Therefore, we measured selected plant functional traits and compa...
Conference Paper
Within the Miombo belt the tri-national Okavango Basin is one of the last remaining intact river basins in Africa. It supports highly diverse social-ecological systems with the majority of the population strongly depending on the direct provision of multiple ecosystem services. Following independence and peace treaties the region is now rapidly bei...
Chapter
Spatial information about plant species composition and the distribution of vegetation types is an essential baseline for natural resource management planning. In Angola, the first countrywide vegetation map was elaborated by Gossweiler in 1939. Subsequently, Barbosa published a revised map with much higher detail in 1970 and his work has remained...
Article
Aim In tropical Africa, savannas cover huge areas, have high plant species richness and are considered as a major natural resource for most countries. There is, however, little information available on their floristics and biogeography at the continental scale, despite the importance of such information for our understanding of the drivers of speci...
Article
Full-text available
The countries of southern Africa have an average forest cover of 32% with most forest situated in the tropics. These dry to moist forests are deciduous with a few evergreen species. The open canopy allows enough light to reach the ground to allow the development of a rich grass layer. Generally, these forests are referred to as woodlands. The artic...
Article
Full-text available
In this paper we present an estimate of above-ground biomass (AGB) in the dry tropical forests and woodlands of southern Angola, western Zambia, northern Namibia and northern Botswana. Furthermore, we investigated the environmental variables influencing the spatial distribution of AGB. We compiled data from 498 vegetation plots and forest inventori...
Article
Aim: The social-ecological systems of south east Angola currently undergo rapid transformations and at the same time the region is highly understudied. We aim to provide a first comprehensive analysis of vegetation types, their environmental drivers and woody species diversity of the region. Study area: Cubango River Basin in south-east Angola and...
Article
Full-text available
This study in the dry tropical woodlands of SE Angola in Cuando-Cubango Province assessed the diversity and composition of woody species in fallows compared to those in mature woodlands. We assessed the population structure of the most harvested woody species by calculating size class distribution and evaluated their regeneration potential based on...
Article
Full-text available
The study was carried out in the Cusseque area of the Municipality of Chitembo in south-central Angola. Our objectives were to assess the floristic diversity, the species composition, and stand structure of Miombo woodlands during regeneration after shifting cultivation. A total of 40 plots of 1000 m 2 were surveyed and analyzed, corresponding to m...
Article
Full-text available
The species composition of the vegetation in most regions of Angola has been poorly studied and most studies date back to the pre-independence era. In this study, we provide a detailed account of the woody flora of the Miombo woodlands and geoxylic grasslands of the Cusseque study site of “The Future Okavango” (TFO) project, situated on the Angolan...
Thesis
Full-text available
Summary The Okavango Basin is situated in south central Africa and shared among the three countries of Angola, Namibia and Botswana. The Okavango River has its source on the sub-humid Angolan Central Plateau where 95% of the runoff is generated. The river terminates in the endorheic Okavango Delta in the Kalahari Desert, forming a world renowned w...
Article
Cross-border studies offer unique situations to study the impact of different land-use regimes on ecosystems. Along the Angolan and Namibian border formed by the Okavango River, the environmental conditions and traditional land-use practises are the same on either side of the river. However, decades of civil war in Angola led to a stagnant developm...
Article
The Okavango river basin, located in southern Africa and shared by the countries Angola, Namibia and Botswana, harbours large extents of natural and semi-natural ecosystems. At the same time, it is a hot spot of accelerating land use change causing transformation of vegetation in many regions of the basin. However, knowledge on vegetation compositi...
Article
Full-text available
In many parts of Africa, spatially-explicit information on plant α-diversity, i.e., the number of species in a given area, is missing as baseline information for spatial planning. We present an approach on how to combine vegetation-plot databases and remotely-sensed land surface phenology (LSP) metrics to predict plant α-diversity on a regional sca...
Article
The repopulation of abandoned areas in Angola after 27years of civil war led to a fast and extensive expansion of agricultural fields to meet the rising food demand. Yet, the increase in crop production at the expense of natural resources carries an inherent potential for conflicts since the demand for timber and wood extraction are also supposed t...
Article
Full-text available
Dry tropical woodlands are the characteristic natural vegetation type of southeast Angola, where precipitation is seasonal and nutrient content of soils is very low. Subsistence farmers overcome the poor abiotic conditions by using shifting cultivation based on specific site selection. We describe the vegetation composition of a previously unstudie...
Chapter
Full-text available
Durante um período de cinco anos (setembro de 2010 a agosto de 2015), 140 pesquisadores de oito países, 23 universidades e instituições de pesquisa adicionais, principalmente de Angola, Botsuana, Namíbia e Alemanha, realizaram o projeto de pesquisa transdisciplinar ‚The Future Okavango‘ (TFO) dentro de toda a Bacia do Okavango-Cubango. Este livro é...
Chapter
Full-text available
Durante um período de cinco anos (setembro de 2010 a agosto de 2015), 140 pesquisadores de oito países, 23 universidades e instituições de pesquisa adicionais, principalmente de Angola, Botsuana, Namíbia e Alemanha, realizaram o projeto de pesquisa transdisciplinar ‚The Future Okavango‘ (TFO) dentro de toda a Bacia do Okavango-Cubango. Este livro é...
Poster
Full-text available
We modelled species distributions of tree species in southeast Angola using solely remotely sensed predictors.
Article
Full-text available
The analysis and evaluation of ecosystems in the Okavango region must include a thorough analysis of the fire regime. This requires a full understanding of its components such as fire frequency, fire season and fire intensity. For the Okavango region these components were derived based on an extensive multi-scale compilation of the MODIS products “...
Article
Full-text available
The repopulation of abandoned areas in Angola after the 27 years of civil war led to a fast and extensive expansion of agricultural fields to meet the rising food demand. This effect is supported by the improvement of infrastructure and has a large impact on the natural vegetation.We evaluated agricultural expansion in our study area in the south o...
Article
Full-text available
The Cusseque core site is embedded in a rolling landscape with a perpendicular stream network. While the hills are covered by Miombo forests and woodlands, the valley bottoms feature wetland vegetation. The striking features of this landscape, however, are the mid-and foot-slopes covered by open vegetation dominated by subterraneous shrubs and gras...
Article
Full-text available
Ongoing monitoring in the Swiss Alps has shown that Rock Ptarmigan (Lagopus muta helvetica) has suffered a significant population decrease over the last decade and climate change has been proposed as a potential cause. In this study, we investigate the response of this high alpine grouse species to rapid climate change. We address a problem often n...
Article
Full-text available
Verbreitungsmodelle (Habitatmodelle, Nischenmodelle) beschreiben funktionale Zusammenhänge der Beziehung zwischen Organismen und ihrem Lebensraum und quantifizieren die Qualität von Habitaten aus der Sicht dieser Organismen. Es handelt sich hierbei um prädiktive statistische Modelle, die aus Verbreitungsdaten und Umwelt- eigenschaften für jeweils a...

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Projects

Projects (5)
Project
This research will investigate the vegetation types and their spatial patterns, habitat types, and environmental factors that influence the distribution of vegetation and the use of the plants by the communities living in the two villages Cambeno and Iona in Iona National Park, in Namibe province, southern Angola.