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  • Karl M. Wantzen
Karl M. Wantzen

Karl M. Wantzen
University of Tours | UFR · UMR CNRS 7324 Centre Interdisciplinaire Cités, Territoires, Environnement et Sociétés (CITERES)

PhD

About

127
Publications
71,376
Reads
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Introduction
Functional ecology of aquatic and freshwater-bound ecosystems, including rivers, streams, wetlands and lakes. Species traits of functionally important, rare, or invasive species mosthly benthic invertebrates. RIVER CULTURE: finding harmonious solutions for human use of rivers and their floodplains without destroying biological or cultural diversities.
Additional affiliations
September 2010 - present
University of Tours
Position
  • Unesco Chair "River Culture", Professor for Freshwater Ecology and restoration, Co-ordinator MSc. course "Engineering Sciences in Sustainable Aquatic Ecosystem Management"
Description
  • see my homepage karlmwantzen.de
December 2009 - August 2010
Karlsruhe Institute of Technology
Position
  • Project manager, coordination of ecological research for an Excellence Cluster
May 2001 - July 2010
Universität Konstanz
Position
  • Junior group leader
Education
October 2017 - April 2021
Johannes Gutenberg-Universität Mainz and University of Konstanz
Field of study
  • Biology, focus on Aquatic Ecology, Biogeochemistry, Animal and Plant Physiology

Publications

Publications (127)
Article
Full-text available
Change detection approaches based on historical maps are frequently used in fluvial geomorphology to re-construct long-term river trajectories and evaluate the level of functional degradation. On this basis, achievable rehabilitation goals may also be addressed. However, most of these studies explore the changes of land cover over time only through...
Article
Full-text available
The present study is a full review of the non-native freshwater fish species introduced into Argentina and their relationship to the main environmental features and introduction vectors of each freshwater ecoregion. The total number of non-native freshwater fish species was compiled through a literature survey; information on spatial–temporal patte...
Research
Full-text available
The present study is a full review of the non-native freshwater fish species introduced into Argentina and their relationship to the main environmental features and introduction vectors of each freshwater ecoregion. full-text access to a view-only: https://rdcu.be/cHy5z
Conference Paper
Full-text available
In many countries of the Global South, aquatic ecosystems such as streams, rivers, lakes and wetlands are severely impacted by multiple environmental, anthropogenic and climatic stressors. In an earlier review (https://www. mdpi.com/2071-1050/11/18/4975), applying a DPSIR approach (Drivers, Pressures, State, Impacts, Responses), we analysed a serie...
Chapter
The Rhine is a 1233 km-long pivotal river in Central Europe. Its catchment harbors about 60 million inhabitants in nine countries from the Alps to the North Sea. On most of its course, this heavily modified water body is managed in favor of industrial production, urbanization, and transport. The 1816 commission on navigability was the first Europea...
Chapter
River ecosystem services (rESS) such as the provision of drinking water, fish and other foods, flood protection, or spaces for recreation are important to human well-being. We present methods, tools, and resources for measuring, mapping, assessing, and reporting on status and trends in rESS. Within this framing, we show current approaches to integr...
Chapter
Wetlands play a much greater role in the global carbon cycle than their area share would suggest. Plant biomass production and restricted decomposition due to continuous soil water saturation make them important atmospheric carbon sinks. This fragile stage can quickly tip towards being atmospheric sources by droughts and drainages. Therefore, they...
Chapter
Full-text available
CHAPTER IN GERMAN - Wetlands occur all over the world. In the tropical regions, depending on the level and regularity of the flooding and the type of soil, they are pronounced as dense forests, open savannahs or as swamps and extensive moors. The duration of the moisture phase is of decisive importance for soil formation and for the prevailing vege...
Article
Plastic in the environment is considered an emerging pollutant of global concern. In spite of intensive research, many questions remain open, such as the processes that drive the deposition and remobilization of plastic debris on river beaches. The objectives of this study were: i) to analyze the influence of the natural hydrological fluctuations a...
Article
Full-text available
Human welfare depends on the health of nature. Decades of ill-conceived management practices caused a decline in the quality of human life, as well as in biological and cultural diversity. Simultaneously, they increased social and ecological risks. For instance, mismanagement of urban rivers jeopardizes their ecological health and ability to provid...
Chapter
Benthic macroinvertebrates colonize all types of lentic and lotic inland hydrosystems. Except for few purely marine groups, almost all taxonomic groups of invertebrates occur in freshwater. Due to their size from less than 1 mm to several centimeters and the amphibious life cycle of aquatic insects as one of the main groups, they are important acto...
Article
Full-text available
Rivers support some of Earth’s richest biodiversity1 and provide essential ecosystem services to society2, but they are often fragmented by barriers to free flow3. In Europe, attempts to quantify river connectivity have been hampered by the absence of a harmonized barrier database. Here we show that there are at least 1.2 million instream barriers...
Article
Full-text available
Vernal pools are small, shallow and ephemeral freshwater wetlands, often located in forests. Despite harboring high levels of biodiversity and being biochemical hotspots, they have been severely degraded by human activities. Restoration of vernal pools has become a priority for resource managers, and monitoring of restoration projects is needed to...
Article
Full-text available
Plastic pollution has become a globally pressing environmental issue. In birds, plastic may cause harm by entangling or ingestion when used for nesting. The use of anthropogenic nesting material has so far been mostly studied in birds of terrestrial or marine habitats, but there are yet very few reports for inland water–associated birds. The aim of...
Conference Paper
Full-text available
Since 2004, UNESCO has highlighted the theme of river and heritage, which was consolidated by the Africities Summit in 2006 in Nairobi, the Loire / Niger project in 2007-2008 and the Symposium River Heritage and territories as of 2011 in Saint- Louis (Senegal). Since 2014, the UNESCO Chair "Fleuves et Patrimoine / River Culture" (www.unesco-chair-r...
Article
Full-text available
In many countries of the Global South, aquatic ecosystems such as streams, rivers, lakes, and wetlands are severely impacted by several simultaneous environmental stressors, associated with accelerated urban development, and extreme climate. However, this problem receives little attention. Applying a DPSIR approach (Drivers, Pressures, State, Impac...
Book
Full-text available
The Giant Freshwater Pearl Mussel (Margaritifera auricularia) is one of the rarest invertebrate species worldwide. This two-volume book aims to bring together all the so far available information on the species. Both volumes are independent books, although they can be seen as complimentary, giving scientific and technical information. They result f...
Book
Full-text available
The Giant Freshwater Pearl Mussel (Margaritifera auricularia) is one of the rarest invertebrate species worldwide. This two-volume book aims to bring together all the so far available information on the species. Both volumes are independent books, although they can be seen as complimentary, giving scientific and technical information. They result f...
Book
Full-text available
The Giant Freshwater Pearl Mussel (Margaritifera auricularia) is one of the rarest invertebrate species worldwide. This two-volume book aims to bring together all the so far available information on the species. Both volumes are independent books, although they can be seen as complimentary, giving scientific and technical information. They result f...
Article
1. The giant freshwater pearl mussel Margaritifera auricularia (GFPM) is one of the most endangered bivalve species in the world. Originally occurring in many European rivers, the GFPM is a relict now restricted to a few ageing populations in France and Spain in which natural reproduction is almost absent. 2. Like most unionoid mussels, the GFPM ne...
Article
Full-text available
Plastic pollution is one of the most acute environmental topics of our time. While there is a great scientific effort to tackle this problem, it has not always been well-coordinated or properly targeted. In this short review, we call for scientists to get involved in three crucial topics (threats) underestimated—or ignored—in freshwater systems: (i...
Article
Rhodeus amarus is a cyprinid fish that spawns in the mantle cavity of freshwater mussels, resulting in a fitness cost to the host mussel. Rhodeus amarus is expanding its geographic range in Europe, hence the exposure of different freshwater mussel species to R. amarus is also rising. This expansion of contact creates potential risk to affected muss...
Article
Full-text available
Despite their small size, vernal pools are hotspots for biogeochemical processes and biodiversity. To better understand their functioning, we studied the influence of vegetation (Sphagnum palustre, Molinia caerulea (L.) Moench) on organic-matter (OM) decomposition in soils, during periods of drought. OM decomposition rates were quantified by using...
Article
European freshwater ecosystems are increasingly invaded by exotic animal and plant species. Apart from increased connectivity between previously separated watersheds, the increasing temperature of the hydrosystems favors the spread of exotic species. The freshwater fauna of Central Europe is still shaped by the cold-adapted animal assemblages resul...
Article
Full-text available
Urban rivers are socioecological systems, and restored habitats may be attractive to both sensitive species and recreationists. Understanding the potential conflicts between ecological and recreational values is a critical issue for the development of a sustainable river-management plan. Habitat models are very promising tools for the ecological ev...
Article
Full-text available
Fluctuations of temperature and water levels are the two main drivers of aquatic life in river floodplain ecosystems. The large Middle Paraná River floodplain exhibits marked seasons and important interannual hydrological changes. Using a three-factor-based approach (fish reproductive traits, hydroclimatic conditions, and floodplain recruitment pat...
Article
We describe the gill anatomy of Margaritifera auricularia, including a histological analysis of the marsupium, its brooding capacity and the length of the maturation process, providing information on the hitherto unknown reproductive strategy of French populations. Ova and developing embryos from the Charente and Creuse river populations were found...
Article
Full-text available
The increase in minimum flows has rarely been considered to mitigate the ecological impact of hydroelectric power plants because it requires a site-specific design and expensive long-term monitoring procedure to identify the most beneficial scenario. This study presents a model-based method to estimate, within the model constraints, the most sustai...
Article
Full-text available
The critically endangered Giant Freshwater Pearl Mussel Margaritifera auricularia was presumed extinct before its rediscovery in Spain in 1985 and France in 2000. Since then, numerous surveys have been set up to search for living populations in France and Spain. This article presents an up-to-date account of species distribution based on available...
Article
Full-text available
River restoration (RR) is widely practiced in both rural and urban contexts by combining various goals and measures. The theoretical discourse on RR not yet adequately reflects this breadth of restoration practice. In this study, we investigated 110 French RR projects implemented between 1980 and 2015. We analyzed projects considering eight key des...
Article
Full-text available
The European water governance took a decisive turn with the formulation of the Water Framework Directive (WFD), which demands the restoration of all water bodies that did not achieve sufficient ecological status. Urban rivers are particularly impaired by human activities and their restorations are motivated by multiple ecological and societal drive...
Article
Full-text available
The diversity of riverscapes. Scientific, planning and management issues. Établie en 2014 auprès de l’Université François Rabelais de Tours, en partenariat avec l’Université d’Angers et la Mission Val de Loire, la Chaire UNESCO « Fleuves et patrimoine/River Culture », est un dispositif académique qui vise à favoriser les collaborations scientifique...
Article
Full-text available
To explore temporal variation in trophic relationships of benthic invertebrates in the Middle Paraná River floodplain, we performed stable isotopes analysis (SIA) in two lakes with contrasting morphologies during both dry and flooding periods. Lake 1 is permanently connected, large and deep with a narrow aquatic–terrestrial transition zone (ATTZ),...
Article
Full-text available
We introduce here the term “River Culture” to delineate an eco-social approach to mitigate the biological and cultural diversity crisis in riverscapes. It is based on the insight that current environmental change endangers both, biological and cultural diversities in rivers and their basins, and those activities to improve ecosystem functions, biod...
Chapter
Full-text available
This chapter focuses on invertebrates of seasonal floodplains of large neotropical rivers. These huge wetlands are characterized by an annual monomodal flood pulse with extensive wet-and-dry phases that act as a strong selective agent on life-cycle strategies and physiological adaptations of resident biota. Invertebrates play an important role in t...
Article
Full-text available
Functional classification of animals is necessary to enhance the predictive power of food web models. However, while there is a large database for functional classification of benthic invertebrates (Functional Feeding Groups, FFG) in the temperate zone, the attribution of individual species of riverine invertebrates is still in its infancies in the...
Data
Location of study lakes in the Middle Paraná River. The Aquatic Terrestrial Transition Zone (ATTZ) is represented with striped areas. Supplementary material 1
Article
Full-text available
The State of Mato Grosso in Brazil has undergone intensive land use changes over the past decades. Native ecosystems have been converted into agrosystems for the production of cash crops and cattle. The Brazilian Forest Code advocates full protection of specifically sensitive habitats, and it also safeguards a fixed percentage of native vegetation...
Article
The detrital-based food web of many streams and rivers plays a fundamental role in the cycling and retention of carbon and nutrients. However, we still need to understand which global mechanisms underlie the biogeochemical pathways that control energy transfer from the detrital pool through local food webs into nutrient and energy cycles and storag...
Article
Full-text available
TThe process based soil loss model EROSION 2D is used for simulation of soil erosion, sediment transport and deposition on sloped cropland in Campo Verde region of Mato Grosso. Since contour banks and no-till measures are well established tools in local agricultural management, the study targets on estimating protection potential of both measures....
Article
Full-text available
The middle and lower sections of most large rivers have fine-grained bed sediments, which may have a strong influence on the functional and taxonomical structure of benthic invertebrates. Based on results from several studies by the authors on the faunal assemblages and habitat structures of the Paraguay–Paraná River system (Brazil, Paraguay, Argen...
Article
Full-text available
Wetlands have been identified as key elements of global carbon budgets. Today, due to increasing anthropogenic carbon emissions, the carbon storage capacity of these ecosystems has become of global interest. The focus of this research was to determine the storage capacity and mechanisms of carbon sequestration of Neotropical seasonal shallow lakes...
Article
Full-text available
In tropical countries soil erosion is often increased due to high erodibility of geologically old and weathered soils; intensive rainfall; inappropriate soil management; removal of forest vegetation cover; and mining activities. Stream ecosystems draining agricultural or mining areas are often severely impacted by the high loads of eroded material...
Article
Full-text available
Considering the rapid changes in land use in tropical countries and the difficulties of law enforcement in remote areas, management of ecosystems benefits from the landscape approach. Within the landscape approach it is important to assess the different livelihoods of the local populations, as well as the vulnerability of the ecosystems that are su...
Article
Full-text available
Food webs in floodplain ecosystems may be based on a variety of aquatic, terrestrial or amphibious food resources. Here, we determined which of the basal resources mostly contribute to the food webs in a floodplain lake of the Middle Paraná River using isotopic composition of C and N (δ13 C and δ15 N) of potential food sources in the Paraná floodpl...
Article
Full-text available
Management of wetlands is often constrained by lack of a precise typology of habitats. Regional landscape attributes need to be considered in the integrative research of wetlands to allow habitat-specific management. Here we investigated the distribution and the habitat diversity of the wetlands in the Amazonian Piedmont in the Caquetá Department o...