Hendrik Schubert

Hendrik Schubert
University of Rostock · Chair of Ecology

About

202
Publications
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Publications

Publications (202)
Preprint
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Managing eutrophied systems only bottom-up (nutrient decreases) can be economical and ecological challenging. Top-down controls (grazing) were sometimes found to effectively control phytoplankton blooms. However, mechanistic insights, especially on possible trophic cascades, are missing in brackish, species-poor coastal waters, where large cladocer...
Preprint
Sea-level rise intensifies saltwater influx into coastal wetlands causing osmotic stress and probably changing vegetation composition. To determine especially the impact of salinity pulses that occur during flooding events, Typha latifolia , Carex acutiformis , Schoenoplectus tabernaemontani and Phragmites australis were exposed to different salini...
Article
Full-text available
Due to the increasing demand for alternative and supposedly more sustainable single-use tableware compared to conventional fossil-based plastic items, there now exists a broad variety of innovative new bio-based and biodegradable items. The aim of this research is to conduct a monitoring of the biodegradability of selected tableware items: polylact...
Chapter
Mining effluents are colonized by algae, moss, fungi and higher plants. Many of these can extract and hyperaccumulate metals. This process is known as biological polishing. Algae growing in mine effluents can sequester metals through adsorption onto cell walls and by absorption. Charophytes are a specialized group of algae that grow in temperate fr...
Article
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The immediate effect of zinc (Zn) and hydrogen peroxide (H2O2) in Chara braunii was analyzed in short‐time exposure experiments. The exposure concentrations were 12.3, 18.4, and 24.5 μmol L−1 H2O2, 12, 60, and 120 mg L−1 Zn, and 12.3 μmol L−1 H2O2 + 12 mg L−1 Zn, 12.3 μmol L−1 H2O2 + 60 mg L−1 Zn, and 18.4 μmol L−1 H2O2 + 12 mg L−1 Zn. The stress r...
Chapter
Full-text available
The report covers main ecological aspects related to beach wrack ecology and beach management with focus on sandy beaches. The managed beaches had to fill the following criterias: 1) used for recreational purposes, 2) with dominance of sandy sediments, and 3) from where beach wrack is removed on regular basis. The ecological aspects of beach wrack...
Chapter
Full-text available
This report No 5.1 is one of the main outputs of the Project CONTRA (2019–2021), which was fulfilled within the Program Interreg Baltic Sea Region. The report was prepared within the Work Package 5 “Innovative technologies for beach wrack handling and toolkit” by experts from CONTRA Project Partners. It represents the results obtained in the six c...
Article
Full-text available
The first record of a species belonging to the genus Chara L. subgenus Chara R.D.Wood section Grovesia R.D.Wood subsect. Willdenowia R.D.Wood from Europe is presented here, thus challenging the interpretation of its distribution pattern as an intertropical group of charophytes. The morphological characters of the specimens, as well as the results o...
Article
Climate-warming-driven sea level rise may change the vegetation composition of coastal wetlands, influencing ecosystem functions including photosynthetic activity, biomass production, litter decomposability and nutrient cycling. Litter decomposition rates of the most dominant macrophytes, Phragmites australis, Carex sp. and Schoenoplectus tabernaem...
Research
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This “Tool kit”, covering practical aspects of beach wrack management, provides guidance for local and regional decisions makers. It serves as both a reference as well as a decision aid to help practitioners convert current beach wrack management schemes into more sustainable solutions.
Research
Full-text available
Beach wrack collected from managed beaches in the Baltic Sea Region could be used as a valuable resource in the blue bioeconomy. Seven CONTRA case studies have highlighted viable uses for beach wrack and the effect of beach wrack removal on the local environment. This brief recommends policy which: supports beach wrack, that is collected from mana...
Article
Despite a large array of knowledge about triggers and drivers of phytoplankton dynamics in the sea coastal waters there is still no comprehensive understanding of what combinations of hydro-physical, hydro-chemical and biotic characteristics induce harmful algal blooms (HABs), which nowadays expand globally under the conditions of warm weather, hig...
Article
The paper distinguishes beach wrack, the marine generated organic part of beach cast, as a separate management object and discusses research questions related to its management and economically viable use. Based on experiences from the Baltic Sea and existing practices from countries with different management systems clear distinction between the m...
Article
Full-text available
Despite the enticing discoveries of chaos in nature, triggers and drivers of this phenomenon remain a classical enigma which needs irrefutable empirical evidence. Here we analyze results of the yearlong replicated mesocosm experiment with multi-species plankton community that allowed revealing signs of chaos at different trophic levels in strictly...
Article
Full-text available
Mine drainage water from the Schlenze stream, Mansfeld Region, Central Germany, which have shown an increase in heavy metal concentrations of Cd²⁺, Cu²⁺, Pb²⁺, and Zn²⁺, was used to investigate the bioremediation potential of charophytes. The removal of heavy metals by Chara subspinosa from the water was tested in single- and multi-metal additions....
Article
Full-text available
The beaches of the coastal communities in Mecklenburg-Western Pomerania are the most important attraction for tourists, the most popular inner-German tourist destination. So far, there is no coordinated recycling and disposal concept for beach wrack that covers all municipalities, but rather, similar to beach cleaning, there is a multitude of indiv...
Article
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Ökosysteme und ihre Biozönosen sind komplexe, sich selbst regulierende Systeme, die in ständigem Austausch mit der sie umgebenen Umwelt stehen. Die hohe Variabilität in Arten-zusammensetzung, Biomasse und Produktion der Lebensgemeinschaften innerhalb eines Ökosystems wird durch jahreszeitliche Veränderung von Umweltfaktoren, wie Temperatur, Licht u...
Article
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Abstract In the course of the ongoing global intensification and diversification of human pressures, the study of variation patterns of biological traits along environmental gradients can provide relevant information on the performance of species under shifting conditions. The pronounced salinity gradient, co‐occurrence of multiple stressors, and a...
Preprint
Full-text available
In Baltic TRANSCOAST we study the physical, biogeochemical, and biological processes at the land-ocean interface. The coastal zone is heavily impacted by various human activities as well as by geomorphological and climatic processes – on both the land and the sea side. Land-sea interactions at low lying coastal areas that are often dominated by pea...
Article
The Baltic Sea, a young habitat in geological terms, is characterised by strong climatic and salinity gradients that determine species distribution and trigger adaptation processes. The aim here was to test the hypothesis that Baltic Sea charophytes which originate from large freshwater populations exhibit a higher genetic variability than euryhali...
Article
Full-text available
Article
Over recent decades, the neophyte Fucus evanescens has extended eastwards along the salinity gradient within the Baltic Sea, indicating gradual adaptation to low salinity conditions. To find out whether F. evanescens can migrate further into the Baltic Sea and potentially become a competitor to the native F. vesiculosus , the acclimation potentials...
Article
The small-scale impact of submerged vegetation (locally enhanced water transparency) on abiotic / biotic parameters was studied in a shallow (< 1 m mean water depth) brackish lagoon at the German Baltic Sea coast. Suspended matter, nutrients, chlorophyll, light, and zooplankton composition and biomass were compared between dense and sparse submerge...
Article
Full-text available
Abstract Encrustation and element content (Ca, Fe, K, Mg and P) of charophytes was studied along plant thalli to investigate the dependency of thallus age and site-specificity. Charophytes were collected from five sampling sites (Angersdorfer Teiche, Asche, Bruchwiesen, Krüselinsee and Lützlower See) which were distinct with respect to water chemis...
Book
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Baltic Transcoast ist ein durch die Deutsche Forschungsgemeinschaft finanziertes Graduiertenkolleg. Unser Hauptziel ist die Ausbildung von Experten für den Küstenraum. Wir untersuchen die deutsche Ostseeküste als terrestrisch-marine Schnittstelle für Wasser- und Stoffflüsse. Seit Januar 2016 laufen insgesamt 13 Doktroarbeiten, die Angang 2019 ferti...
Article
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Coastal zones connect terrestrial and marine ecosystems forming a unique environment that is under increasing anthropogenic pressure. Rising sea levels, sinking coasts, and changing precipitation patterns modify hydrodynamic gradients and may enhance sea–land exchange processes in both tidal and non-tidal systems. Furthermore, the removal of flood...
Article
Encrustation and element content of six charophyte species from two hard‐water lakes were investigated monthly for a period of one year. Seasonal patterns were analyzed for the interaction of water chemistry. Encrustation followed a seasonal pattern for Chara contraria, C. subspinosa and Nitellopsis obtusa in Lake Krüselin and for C. globularis and...
Article
This study assessed the genetic relationship between Evadne nordmanni of the Baltic Sea and the North Sea from sequence variation of the mitochondrial cytochrome c oxidase subunit I gene (COI) of 88 specimens from 13 different sites, and from further published data from the Atlantic and Pacific basins. The COI sequences of E. nordmanni from the Nor...
Article
Comparison of encrustation and analysis of element contents across species growing in freshwater (FW) and brackish water (BW) have never been done. Proportion of carbonate and element composition for Ca, K, Mg, Na, and P of plant DW were investigated in four charophyte species from ten freshwater and six brackish water sites in northern Europe. Cha...
Article
The article reviews modern concepts of the protistan diversity patterns within the environmental gradients in the pelagic coastal ecosystems and the role of microplankton communities therein, with special emphasis on dinoflagellates. We revise the knowledge on biology of the bloom-forming, potentially toxic, mixotrophic dinoflagellates Prorocentrum...
Article
The coastal waters are important transition zones for terrestrial nutrient and pollutant runoff and the open Sea. During the last decades, eutrophication has negatively influenced macrophyte communities of the coastal ecosystems, making restoration activities inevitable. This study analysed recent macrophyte vegetation and the reproductive potentia...
Article
Anthropogenic disturbance over several decades has caused aquatic ecosystems to deteriorate, raising concerns about their condition and, consequently, prompting restorative activities. The recovery of submerged vegetation (notably charophytes) is a crucial requirement for the restoration of eutrophic aquatic systems. The success of this action ofte...
Article
Distinct distribution patterns were observed for several species of charophytes during a survey in Chile. We attempted to link these patterns to climatic conditions, but no direct causality between specific climatic factors and charophyte growth conditions could be identified. In this paper, correlations between water chemistry and occurrence of ch...
Article
Individuals within wild populations differ substantially in their fitness as a result of either genetic differences or acclimation. Within the Charophyte algae, the two taxa Chara baltica and C. liljebladii predominate at different water depths of the same habitat. The two taxa are mainly distinguished by quantitative characteristics, pointing to l...
Article
Full-text available
Eelgrass (Zostera marina) is a marine foundation species essential for coastal ecosystem services around the northern hemisphere. Like all macroscopic organisms, it possesses a microbiome (here defined as an associated prokaryotic community) which may play critical roles in modulating the interaction of eelgrass with its environment. For example, i...
Chapter
1. Strategies of aquatic organisms to cope with ambient environmental conditions involve avoidance reactions or more profound behavioural and physiological adjustments, collectively called “adaptations”. 2. Modulative (irreversible) and modificative (reversible) adaptations are short-term compensatory changes (acclimations) in an individual in resp...
Chapter
1. Estuaries and coastal lagoons, semi-enclosed inland water bodies, are highly productive systems and function as a transitional zone between land and sea. 2. In the Baltic Sea Area, it may be difficult to discriminate between lagoon-type estuaries and lagoons with some freshwater influence because there is a continuum between pure estuaries and p...
Chapter
1. Water is the most abundant compound on the surface of the Earth and the chemical basis for life on Earth. 2. The strong polarity of the water molecule assigns special physical and chemical properties to water as the direct environment in which aquatic organisms live, propagate and interact. 3. The surface tension of water creates the pleuston ha...
Preprint
Full-text available
Eelgrass (Zostera marina) is a marine foundation species essential for coastal ecosystem services around the northern hemisphere. Like all macroscopic organisms, it possesses a microbiome which may play critical roles in modulating the interaction of eelgrass with its environment. For example, its leaf surface microbiome could inhibit or attract eu...
Article
Field investigations from all over Chile combined with a check of herbarium collections increased the number of species within the subfamily Nitelleae known for Chile from 6 to 16. Nitella flexilis, N. acuminata, N. clavata, N. bonaërensis, N. lechleri and Tolypella apiculata have been previously recorded from Chile. N. flexilis and N. clavata are...
Article
Full-text available
Field investigations all over Chile combined with a check of herbarium collections increased the number of taxa within the subfamily Chareae known for Chile from 7 to 15. Chara vulgaris, C. braunii, C. capillacea (= C. globularis var. capillacea), C. nitelloides, C. contraria var. longilinea, C. magellanica and C. calveraënsis had been recorded fro...
Chapter
Bioindication is defined as the indication of ecological quality based on composition of organisms of a habitat. The basis forms the knowledge of the relationship between organisms and habitat conditions. The history of bioindication using Charophytes is described. Charophytes have mainly been used for the indication of trophic status. The best way...
Article
This study analyses three decades of the peculiar bloom-formation history of the potentially toxic invasive planktonic dinoflagellates Prorocentrum minimum (Pavillard) Schiller in the SW Baltic Sea. We tested a research hypothesis that the unexpectedly long delay (nearly two decades) in population development of P. minimum prior to its first bloom...
Article
Full-text available
Dinoflagellates readily use diverse inorganic and organic compounds as nitrogen sources, which is advantageous in eutrophied coastal areas exposed to high loads of anthropogenic nutrients, e.g., urea, one of the most abundant organic nitrogen substrates in seawater. Cell-to-cell variability in nutritional physiology can further enhance the diversit...
Article
Charophytes are aquatic macrophytes with a complex morphology that belong to the Streptophytina phylum. The high degree of morphological plasticity in the genus Chara has led researchers to propose two competing species concepts, a micro- and macrospecies concept, the relevance of which we tested by phylogenetic analyses. We conducted a phylogeneti...
Article
Full-text available
A comprehensive expert consultation was conducted in order to assess the status, trends and the most important drivers of change in the abundance and geographical distribution of kelp forests in European waters. This consultation included an on-line questionnaire, results from a workshop and data provided by a selected group of experts working on k...
Article
Macrophytes and phytoplankton compete for inorganic nitrogen during growth, even in eutrophied coastal waters containing relatively high nitrogen concentrations. In this study we investigated, whether dissolved organic nitrogen (DON) serves as an additional nitrogen source for rooted submerged macrophytes in several key species in the nutrient-rich...
Chapter
This chapter presents an overview about ontogenesis of charophytes. Knowledge about ontogenesis allows the reader to evaluate the importance of morphological characters in use for determination purposes. It also provides the basis for understanding the evolution of the phylogenetic lineages. In this chapter, the full generation cycle from germinati...
Article
The protistan species maximum concept for the challenging zone of critical salinity 5–8 (the horohalinicum) where the large benthic organisms experience the destructive osmotic stress has developed smoothly into the understanding that in the environment with sharp salinity fluctuations community regulations and life strategies of small unicellular...
Article
Full-text available
Nadia zanianii has been described and illustrated as a new species from a rice field at Charghat upazila in Bangladesh. The new species resembles Nitella Arcata and N. polycarpa but differs by presence of accessory branchlets, spiky dactyls and size of oogonium, oospore and antheridium.
Article
Full-text available
Anthropogenically derived nitrogen (N) has a central role in global environmental changes, including climate change, biodiversity loss, air pollution, greenhouse gas emission, water pollution, as well as food production and human health. Current understanding of the biogeochemical processes that govern the N cycle in coupled human-ecological system...
Article
Oospores of charophytes allow species delineation in palaeoecology, but are rarely used for determination of recent taxa. Especially in the genus Chara there is no generally accepted catalogue of oospore characters and the existing determination keys do not include brackish water material. Parameters with discriminatory power by statistical analysi...
Article
A recently discovered paradoxical maximum of planktonic protistan species in the salinity gradient of the Baltic Sea revealed an inverse trend of species number/salinity relation in comparison to the previously accepted species-minimum model for macrozoobenthos. Here, we review long-term data on organisms of different size classes and ecological gr...
Article
The NAD(P)H-oxidoreductase or complex I (NDH1) complex participates in many processes such as respiration, cyclic electron flow, and inorganic carbon concentration in the cyanobacterial cell. Despite the immense progress in our understanding of structure/function relation of the cyanobacterial NDH1 complex, the subunits catalysing the NAD(P)H docki...
Article
Full-text available
Kettle holes, small inland water bodies usually less than 1 ha in size, are subjected to pollution, drainage, and structural alteration by intensive land use practices. This study presents the analysis of spectral signatures from kettle holes based on in situ water sampling and reflectance measurements in application for chlorophyll estimation. Wat...