Dietmar Quandt

Dietmar Quandt
University of Bonn | Uni Bonn · Nees Institute for Biodiversity of Plants

Professor

About

243
Publications
63,327
Reads
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5,975
Citations
Additional affiliations
July 2008 - present
Rheinische Friedrich-Wilhelms-Universität Bonn
September 2004 - April 2005
Virginia Polytechnic Institute and State University
Position
  • PostDoc Position
April 2004 - June 2008
Technische Universität Dresden

Publications

Publications (243)
Article
Among the fascinating and highly specialized vascular plants in the hyperarid core of the Chilean and Peruvian Atacama Desert there are few Tillandsia species from the bromeliad family (Bromeliaceae). These grow epiarenically on bare sand without a functional root system, and in some rare cases they build up a monospecific and often the only landsc...
Article
Full-text available
Soil erosion continues to be one of the most serious environmental problems of our time and is exacerbated by progressive climate change. Until now, forests have been considered an ideal erosion control. However, even minor disturbances of the forest floor, for example, from heavy vehicles used for timber harvesting, can cause substantial sediment...
Article
Increasing evidence indicates that wide distributed bryophyte taxa with homogeneous morphology may represent separate evolutionary lineages. The evolutionary histories of these cryptic lineages may be related to historical factors, such as the climatic oscillations in the Quaternary. Thus, the post-glacial demographic signatures paired with cryptic...
Article
Phylogenetic relationships of species within the pleurocarpous moss genus Neckera s.l. (Neckeraceae) are reconstructed based on three genomic regions: the plastid rps4-trnT-trnL-trnF cluster and the rpl16 group II intron, as well as the internal transcribed spacer region of the nuclear ribosomal DNA (ITS1-5.8S-ITS2). The phylogenetic reconstruction...
Article
Full-text available
The post-Miocene climatic histories of arid environments have been identified as key drivers of dispersal and diversification. Here, we investigate how climatic history correlates with the historical biogeography of the Atacama Desert genus Cristaria (Malvaceae). We analyze phylogenetic relationships and historical biogeography by using next-genera...
Preprint
Full-text available
Soil erosion continues to be one of the most serious environmental problems of our time, which is exacerbated by progressive climate change. Until now, forests have been considered an ideal erosion control in this regard. However, even minor disturbances of the forest floor for example from heavy vehicle used for timber harvesting can cause substan...
Article
Among liverworts, the epiphytic lifestyle is not only present in leafy forms but also in thalloid liverworts, which so far has received little attention in evolutionary and biogeographical studies. Metzgeria, with about 107 species worldwide, is the only genus of thalloid liverworts that comprises true epiphytes. In the present study, we provide th...
Article
Dipluridae represent a small Mygalomorphae family of South American origin, the family includes two subfamilies Diplurinae and Masteriinae although the placement of the latter in Dipluridae is still under debate. The family has a predominantly South American distribution although the genus Masteria L. Koch, 1873 presents an interesting distribution...
Article
Full-text available
The Chilean Atacama Desert is among the oldest deserts of the world. Here, Tillandsia landbeckii is forming a unique vegetation type known as Tillandsia lomas. This vegetation consists in its typical configuration of one single vascular plant species only and forms regular linear structures in a sloped landscape and is largely depending on fog occu...
Article
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Premise: The cactus family (Cactaceae) is a speciose lineage with an almost entirely New World distribution. The genus Eulychnia with eight currently recognized species is endemic to the Atacama and Peruvian Deserts. Here we investigated the phylogeny of this group based on a complete taxon sampling to elucidate species delimitation and biogeograp...
Article
Full-text available
Functional traits determine how species interact with their abiotic and biotic environment. In turn, functional diversity describes how assemblages of species as a whole are adapted to their environment, which also determines how they might react to changing conditions. To fully understand functional diversity, it is fundamental to (a) disentangle...
Article
Full-text available
• Ecosystem dry limits have been studied in the context of species biology, fitness, and interactions with biotic and abiotic parameters, but the interactive effects of these parameters remain underexplored. Therefore, information on the putative effects of global climate change on these ecosystems is often lacking. • We analyzed the interplay betw...
Article
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At the land surface, the availability of water controls the evolution of life as well as the morphological development. It is currently hardly known how far both evolutionary processes interact in water-limited environments. While it is well considered that biotic processes contribute to weathering and therewith also prepare the landscape for erosi...
Article
Phylogenetic relationships of and within non-photosynthetic parasitic lineages are notoriously poorly known, which negatively affects our understanding of parasitic plants. This is also the case for Cistanche (Orobanchaceae), an Old World genus with about two dozen species, whose relationships have not yet been addressed using molecular phylogeneti...
Article
Full-text available
We studied the influence of regional and local variables on the liverwort diversity within natural forest vegetation of Uganda to contribute to our understanding of the mechanisms and processes determining species richness. To this end, we compared the species richness distribution patterns of epiphytic and non-epiphytic liverworts (Marchantiophyti...
Article
Full-text available
Extreme arid conditions in the Atacama Desert in northern Chile have created a unique vegetation almost entirely restricted to the desert margins along the coast of the Pacific Ocean and the Andean range. In this study we provide data on the desert vegetation along elevational gradients at four localities from the western Andean slopes, between 19°...
Article
Full-text available
The hornwort Anthoceros agrestis is emerging as a model system for the study of symbiotic interactions and carbon fixation processes. It is an annual species with a remarkably small and compact genome. Single accessions of the plant have been shown to be related to the cosmopolitan perennial hornwort Anthoceros punctatus. We provide the first detai...
Article
Full-text available
Hornworts comprise a bryophyte lineage that diverged from other extant land plants >400 million years ago and bears unique biological features, including a distinct sporophyte architecture, cyanobacterial symbiosis and a pyrenoid-based carbon-concentrating mechanism (CCM). Here, we provide three high-quality genomes of Anthoceros hornworts. Phyloge...
Article
Our knowledge of the diversity of African freshwater red algae is rather limited. Only a few reports exist. During our field work in the last five years we frequently encountered freshwater red algae in streams in Rwanda and Madagascar. Here we describe four new species and one new genus of freshwater red algae from the Batrachospermales, based on...
Article
In hyper-arid habitats vegetation tends to be highly patchy with individual plant populations set widely apart from each other. In the Atacama Desert of northern Chile, rainfall is essentially absent, but fog occurring both at the coast and sometimes reaching inland areas supports patches of vegetation in an otherwise barren environment. Tillandsia...
Article
Balsamocarpon brevifolium Clos (Fabaceae), an endangered endemic shrub of the Chilean Atacama Desert, nowadays occurs in fragmented populations, which are exploit since at least 200 years. Understanding its genetic diversity, population structure and distribution patterns are essential for conservation planning and sustainable management. Based on...
Article
The Atacama Desert in western South America is considered as one of the driest places on earth, but is nevertheless characterized by surprisingly high species richness and levels of endemism. The plant genus Cristaria (Malvaceae), with ca. 21 species, is one of the most diverse genera of the Atacama Desert, while the much less diverse sister genus...
Article
In our recent paper on the relationships of 21 European Hypnum taxa we introduced the name Hypnum subcomplanatum Hedenäs, Schlesak & D. Quandt as a new name at the species level, based on the basionym Hypnum cupressiforme var. subjulaceum Molendo (Schlesak et al. 2018). We were aware that H. cupressiforme var. subjulaceum had already been elevated...
Article
Full-text available
Mosses are a highly diverse lineage of land plants, whose diversification, spanning at least 400 million years, remains phylogenetically ambiguous due to the lack of fossils, massive early extinctions, late radiations, limited morphological variation, and conflicting signal among previously used markers. Here, we present phylogenetic reconstruction...
Article
Full-text available
The Atacama Desert harbors a unique arid-adapted flora with a high degree of endemism, the origin of which is poorly understood. In the Atacama Desert, Zygophyllaceae is represented by five endemic species: one member of Zygophylloideae: Fagonia chilensis; and four members of Larreoideae: Bulnesia chilensis and Porlieria chilensis, the only represe...
Poster
Full-text available
The Atacama Desert, located on the western side of the Andes in northern Chile, harbours a range of endemic species adapted to hyperarid conditions. Vegetation is largely restricted to coastal fog oases and the Andean foothills, which are separated by a largely vegetation-free zone. Diversifications have been shown to be surprisingly recent in some...
Article
Full-text available
The pleurocarpous moss genus Hypnum s.l. is a species-rich (> 40 species) cosmopolitan genus, of which 21 taxa occur in Europe. Although several of these species show high morphological resemblance there are strong indications that the genus is highly paraphyletic, which may be masked by convergent morphological evolution. Using molecular informati...
Article
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This special issue of Bryophyte Diversity and Evolution is dedicated to Jochen Heinrichs (1969–2018) in commemoration of his outstanding contributions to bryology. His work spanned a diverse spectrum of topics that will be reflected in this special issue by 10 research papers. Therein, and in honor of Jochen, the moss genus Jochenia gen. nov. (Schl...
Article
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Interactions between fungi and plants, including parasitism, mutualism, and saprotrophy, have been invoked as key to their respective macroevolutionary success. Here we evaluate the origins of plant-fungal symbioses and saprotrophy using a time-calibrated phylogenetic framework that reveals linked and drastic shifts in diversification rates of each...
Article
Besides their alleged therapeutic effects, mistletoes of the genus Viscum L. (Viscaceae) are keystone species in many ecosystems across Europe, Africa, Asia and Australia because of their complex faunal interactions. We here reconstructed the evolutionary history of Viscum based on plastid and nuclear DNA sequence data. We obtained a highly resolve...
Poster
Full-text available
The Atacama Desert, located on the western side of the Andes in northern Chile, harbors a range of endemic species adapted to hyperarid habitats. Vegetation is largely restricted to coastal fog oases and the Andean foothills, which are separated by a largely vegetation-free zone. In the context of a large-scale project on landscape and biotic evolu...
Preprint
Full-text available
Besides their alleged therapeutic effects, mistletoes of the genus Viscum L. (Viscaceae) are keystone species in many ecosystems across Europe, Africa, Asia, and Australia because of their complex faunal interactions. We here reconstructed the evolutionary history of Viscum based on plastid and nuclear DNA sequence data. We obtained a highly resolv...
Article
Full-text available
Specimens of Andreaea sect. Andreaea collected in Lesotho show morphological differences from the remaining Sub-Saharan Africa species in the group. Particularly, Lesotho specimens have much larger spores, a character diagnostic in the genus. Spore size also separates the Lesotho specimens from typical A. rupestris from the Northern Hemisphere. Con...
Article
Are the disjunct distributions of ancient lineages on continents in the Southern Hemisphere determined by vicariance following the Gondwanan tectonic breakup or recent long-distance dispersal? We traced the historical biogeography of the tree fern family Dicksoniaceae (145 Ma), which has a typical Gondwanan distribution, to test for vicariance or r...
Article
Full-text available
Cistanthe longiscapa is an endemic annual herb and characteristic element of the Chilean Atacama Desert. Principal threats are the destruction of its seed deposits by human activities and reduced germination rates due to the decreasing occurrence of precipitation events. To enable population genetic and phylogeographic analyses in this species we p...
Article
Full-text available
With 280 accepted species, the genus Riccardia S.F.Gray (Aneuraceae) is one of the most speciose genera of simple thalloid liverworts. The current classification of this genus is based on morphological and limited-sampling molecular studies. Very few molecular data are available and a comprehensive view of evolutionary relationships within the genu...
Article
Full-text available
Two closely related tropical genera from the pleurocarpous moss family Neckeraceae are revised: the second largest genus in the family, Neckeropsis, currently with 29 species, and Himantocladium, comprising six species. Twenty-one species of Neckeropsis and five of Himantocladium were included in this study, which is based on phylogenetic analyses...
Article
Full-text available
Because novel environmental conditions alter the selection pressure on genes or entire subgenomes, adaptive and nonadaptive changes will leave a measurable signature in the genomes, shaping their molecular evolution. We present herein a model of the trajectory of plastid genome evolution under progressively relaxed functional constraints during the...
Article
Full-text available
Botanists and plant morphologists have long been fascinated by how certain species can exhibit such reduced morphologies that even their identification to genus- or family-level becomes difficult. Such was the case with Lysipomia mitsyae sp. nov., an exceptionally small plant discovered in the Peruvian Andes which bears lobelioid characteristics bu...
Article
A comprehensive survey of the liverwort family Pelliaceae including molecular, morphological and biogeographical data reveals a deep split of the taxa into two main clades each corresponding to a morphologically clearly delimited group. Therefore, the recognition of two distinct genera within the Pelliaceae is suggested: (1) Pellia, which comprises...
Article
Biodiversity loss is mainly driven by human activity. While concern grows over the fate of hot spots of biodiversity, contemporary species losses still prevail in industrialized nations. Therefore, strategies were formulated to halt or reverse the loss, driven by evidence for its value for ecosystem services. Maintenance of the latter through conse...
Article
Myrtucommulone A (MC A) (1), isolated from Myrtus communis (myrtle), shows the same pharmacological activity for inhibition of inflammation and induction of apoptosis as synthetic MC A, which consists of three stereoisomers, i.e., two enantiomers and one meso form. This led to the question of whether the natural MC A is a pure stereoisomer or a mix...
Conference Paper
Full-text available
We combine the conventional method of ex situ cultivation and the new molecular DNA-barcoding for the development of the new monitoring tool. With DNA-barcoding of the seed bench it should be possible to determine the current and potential or past plant diversity of a site on a fast, significant and cost-efficient way.
Article
Full-text available
Background Plants colonized terrestrial environments approximately 480 million years ago and have contributed significantly to the diversification of life on Earth. Phylogenetic analyses position a subset of charophyte algae as the sister group to land plants, and distinguish two land plant groups that diverged around 450 million years ago – the br...
Article
Full-text available
• Flowers of Sabiaceae diverge from basal eudicots in combining pentamery with superposed whorls of sepals, petals, and stamens and are therefore crucial in understanding origins of core eudicot flowers. Different hypotheses are tested using floral developmental evidence, whether the pentamerous flower is derived from a spiral, trimerous, or dimero...
Article
Full-text available
A molecular based study of relationships in the Hedwigiaceae, with a special focus on the genus Hedwigia in Europe was carried out. A combined approach using sequence data from all three genomes, information obtained from the secondary structures of the nad5 group I intron, and morphological data was performed in order to clarify species concepts i...
Article
Three fertile populations of Racomitrium laevigatum A. Jaeger from southern Chile have recently been discovered. Here we present a novel description and illustrations of its sporophytes and comments on the phylogenetic implications of this finding.