Stefan Porembski

Stefan Porembski
University of Rostock · Lehrstuhl für Allgemeine und Spezielle Botanik und Botanischer Garten

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22
Publications
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1,303
Citations
Citations since 2017
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416 Citations
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2017201820192020202120222023020406080
2017201820192020202120222023020406080
2017201820192020202120222023020406080

Publications

Publications (22)
Article
Full-text available
Utricularia species capture small prey in traps. The prey spectrum of aquatic Utricularia species includes a large variety of organisms (e.g. copepods, cladocerans, crustacea, rotifers, algae). This study focuses on selected attributes (species richness, density, biovolume, C and N contents) of microalgae captured inside the traps of aquatic Utricu...
Article
Full-text available
The carnivorous bladderworts (Utricularia) possess complicated suction traps. Remarkably, information on the prey trapped is relatively sparse. We have conducted a detailed survey on the prey spectra found in traps of selected aquatic bladderworts (U. australis, U. vulgaris) occurring in ponds in northeastern Germany. A close examination of more th...
Article
Roots of tree-like Cyperaceae (Afrotrilepis pilosa, Bulbostylis leucostachya, Coleo-chloa setifera, Microdracoides squamosus) and Velloziaceae (Vellozia variegata, Xe-rophyta pinifolia) were examined by light and scanning electron microscopy. For the first time a velamen is reported for Bromeliiflorae and Commeliniflorae. All species studied posses...
Article
Roots of 344 species of 262 representative genera of Orchidaceae have been examined under systematic aspects by light and scanning electron microscopy; the paper is illustrated by 25 SEM-photos and schematic drawings. In particular the stratification and micromorphology of the rhizodermis (velamen radicum) exhibits a high diversity which can be app...
Article
The African and Madagascan representatives of the carnivorous genus Genlisea are investigated. All African material belongs to subgenus Genlisea and can be assigned to 10 taxa, which mainly differ in indumentum of calyx, corolla and ovary. The former section Tayloria, restricted to South America, is raised to subgeneric rank. One species, Genlisea...
Article
The mat-forming poikilohydric sedge Afrotrilepis pilosa (Cyperaceae) occurs as the dominant member of characteristic stands on West African inselbergs. The species composition of this community has been examined in the Ivory Coast along a latitudinal gradient from the savanna to the rainforest region. Inselbergs consisting of Precambrian granites a...
Book
Plants that trap and eat animals have inspired awe since before the days of Darwin. Lured into the danger zone by optical, tactile, and olfactory strategies, the prey succumb to ingenious traps and face their doom. But unlike plants that temporarily catch insects for pollination, the true carnivores go considerably further: they digest them for the...
Article
Inselbergs are isolated rock outcrops frequently consisting of granite or gneiss, and are widespread on the old crystalline continental shields. Due to harsh environmental conditions (i.e. lack of soil and water, high temperatures) their vegetation is markedly different from that of their surroundings. Typical is a specific set of habitat types suc...
Article
Full-text available
Within carnivorous plants, the bladderworts (Utricularia) possess the most complicated traps whose mechanisms are not yet completely understood. For the first time, a representative survey of different traps from both subgenera (Utricularia and Polypompholyx) is presented.Based on scanning- and transmission electron microscopy, traps of 14 species...
Article
Utricularia forms the largest genus of carnivorous plants and is characterized by the possession of typical traps (“bladders”). Total biomass allocation was examined in three aquatic, six terrestrial and one epiphytic species of Utricularia from natural habitats in West Africa and from the Botanical Gardens, Bonn. Total biomass of aquatic species w...
Article
Inselbergs are monolithic, old and stable landscape elements with a worldwide distribution. On inselbergs, relatively old (i.e. hundreds of years old) rock pools form a unique habitat that offers locally wet conditions in an otherwise edaphically and microclimatically dry environment. They occur as seasonally water-filled depressions with a thin la...
Chapter
There is now little doubt that anthropogenic impacts will lead to further fundamental changes in the biosphere. Detailed information on the dynamic attributes of the major components of global change is urgently needed for predicting future scenarios of biodiversity in a rapidly changing world. Excellent overviews of the different facets of global...
Article
Inselbergs of the Atlantic rainforest zone in south-eastern Brazil typically appear black because of the presence of a dense cyanobacterial film. We investigated this autotrophic, microorganism covering on the exposed rock surfaces of five selected inselbergs along a latitudinal gradient, from Parati Mirim in the south to Serra dos Amores in the no...
Article
Utricularia is the largest genus of carnivorous plants, however, surprisingly little is known about the prey spectrum within the genus. The scarce information available stems from a few aquatic Northern hemisphere species. Of the 214 species of Utricularia, the vast majority grows terrestrial and the only report on their prey is by DARWIN who gaine...
Article
Although desiccation tolerance is common in non-vascular plants, this adaptive trait is very rare in vascular plants. Desiccation-tolerant vascular plants occur particularly on rock outcrops in the tropics and to a lesser extent in temperate zones. They are found from sea level up to 2800m. The diversity of desiccation-tolerant species as measured...
Article
Inselbergs occur as mostly dome-shaped rock outcrops in all climatic and vegetational zones of the tropics. Consisting of Precambrian granites and gneisses, they form ancient and stable landscape elements. Due to harsh edaphic and microclimatic conditions, the vegetation of inselbergs differs markedly from those of the surroundings. Monocotyledonou...
Article
Some 450 species of insectivorous plants have been discovered since Darwin published his work on the subject in 1875. We report here the first known case of a plant that traps and digests protozoa.
Article
The biology, ecology, and distribution ofSelenicereus (Strophocactus)wittii, one of the least known taxa ofCactaceae, are described. This epiphyte climbs appressed to tree trunks with leaf-like, flattened stems and is found exclusively along the high waterline of black water rivers (Rio Negro, Vaups, Apaporis) in the Igap inundation forests of Amaz...
Article
The vegetation of small granitic rock outcrops (geomorphologically small-sized inselbergs) which do not reach the canopy was studied in the Taı rain forest (southwestern Ivory Coast) under aspects of species diversity and phytogeographical affinities. Rock outcrops form edaphically arid (due to absent or very sparse soil cover) and microclimatologi...