Christian K. Feld

Christian K. Feld
University of Duisburg-Essen | uni-due · Arbeitsgruppe Aquatische Ökologie

About

102
Publications
52,412
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7,853
Citations
Citations since 2017
39 Research Items
4316 Citations
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20172018201920202021202220230200400600800
20172018201920202021202220230200400600800

Publications

Publications (102)
Article
Full-text available
Agriculture, the world’s most dominant land use type, burdens freshwater biodiversity with a multitude of stressors such as diffuse pollution and hydromorphological alteration. However, it is difficult to directly link agricultural land use with biota response as agricultural stressors can also originate from other causes. Also, there is evidence f...
Article
Full-text available
The Multispecies Freshwater Biomonitor © (MFB) is a unique real-time toximeter, that has been developed in 1994 and since then continuously adapted , for the permanent surveillance of the water quality in surface water, ground water and wastewater. After intensive scientific research in different fields of application, the MFB has already been used...
Article
Global climate change and related land use changes are expected to impose unprecedented pressures on coastal biodiversity and ecosystem processes. To sustainably manage coastal ecosystems, it is crucial to predict the consequences of human activities for coastal ecosystems and identify areas for directed abatement measures. Empirical data together...
Presentation
While being among the most productive ecosystems on earth, coastal ecosystems are heavily impacted by anthropogenic causes on land and at sea. Fisheries, nutrient discharges from land uses and global climate change, for example, adversely affect coastal seas’ biodiversity, functioning and related nature’s contributions to people (NCPs). Data and kn...
Article
Rivers are a key part of the hydrological cycle and a vital conduit of water resources, but are under increasing threat from anthropogenic pressures. Linking pressures with ecosystem services is challenging because the processes interconnecting the physico-chemical, biological and socio-economic elements are usually captured using heterogenous meth...
Article
Humans have severely altered freshwater ecosystems globally, causing a loss of biodiversity. Regulatory frameworks, like the Water Framework Directive, have been developed to support actions that halt and reverse this loss. These frameworks use typology systems that summarize freshwater ecosystems into environmentally delineated types. Within types...
Article
Full-text available
Modern wastewater treatment plants cannot completely remove pollutants. Often, effluents entering the aquatic environment still contain micropollutants such as pharmaceuticals or pesticides, which may impose adverse effects on aquatic biota. At the same time, a large proportion of free-living aquatic species are known to be infected with parasites,...
Article
Full-text available
Longitudinal training dams (LTDs) in the river Waal are novel river training structures that protect the littoral zone from the adverse effects of navigation providing new habitats for riverine macroinvertebrates. In order to inform river management and to better understand their ecological value for native and alien mussel species, it is important...
Article
The success of river restoration projects regarding its effects on cultural ecosystem services (CES) and contributions to human well-being is not frequently evaluated. Here, we recorded CES and associated values of a restored river site based on social media posts of visitors. We analysed 605 photographs from three social networking sites (Flickr,...
Article
To date, micropollutants from anthropogenic sources cannot be completely removed from effluents of wastewater treatment plants and therefore enter freshwater systems, where they may impose adverse effects on aquatic organisms, for example, on fish. Advanced treatment such as ozonation aims to reduce micropollutants in wastewater effluents and, thus...
Article
Full-text available
Intraspecific diet specialization, usually driven by resource availability, competition and predation, is common in natural populations. However, the role of parasites on diet specialization of their hosts has rarely been studied. Eye flukes can impair vision ability of their hosts and have been associated with alterations of fish feeding behavior....
Article
Despite advances in conceptual understanding, single-stressor abatement approaches remain common in the management of fresh waters, even though they can produce unexpected ecological responses when multiple stressors interact. Here we identify limitations restricting the development of multiple-stressor management strategies and address these, brid...
Article
Full-text available
The biota of European rivers are affected by a wide range of stressors impairing water quality and hydro‐morphology. Only about 40% of Europe’s rivers reach ‘good ecological status’, a target set by the European Water Framework Directive (WFD) and indicated by the biota. It is yet unknown how the different stressors in concert impact ecological sta...
Poster
Full-text available
The poster demonstrates how to combine Bow-Ties and BBN methodology to inform environmental decision-making in coastal areas. The poster is part of the the international research project Land2Sea, where the focus is how to do integrated modelling of the consequences of terrestrial activities and climate change for aquatic biodiversity and ecosystem...
Article
Rivers provide ecosystem services (ES) that benefit people, but worldwide, many rivers are severely degraded thus compromising service supply. River restoration aims at reversing this condition. We reviewed the scientific literature to synthesise published effects of restoration on ES and to identify which specific ES commonly benefit from or reced...
Article
Rivers provide ecosystem services (ES) that benefit people, but worldwide, many rivers are severely degraded thus compromising service supply. River restoration aims at reversing this condition. We reviewed the scientific literature to synthesise published effects of restoration on ES and to identify which specific ES commonly benefit from or reced...
Article
River assessments are predominantly based on biological metrics and indices selected or designed to integrate the impact of multiple causes of deterioration (stressors) operating at various spatial scales. Yet, the integrative nature of many bioassessment systems does not allow for tracing back individual stressors and their influence on the overal...
Article
Full-text available
Climate and land-use change drive a suite of stressors that shape ecosystems and interact to yield complex ecological responses, i.e. additive, antagonistic and synergistic effects. Currently we know little about the spatial scale relevant for the outcome of such interactions and about effect sizes. This knowledge gap needs to be filled to underpin...
Article
Full-text available
Parasites comprise a huge part of the biodiversity on earth. However, on a local scale, not much is known about their diversity and community structure. Here, we assess the diversity of larval trematode communities in an interconnected freshwater system of the River Ruhr in Germany and analyse how the parasites are spatially and temporally distribu...
Article
Hydrological alteration of rivers is recognised as a major threat to lotic biodiversity acting at broad spatial scales, however, the effect size and pathways of hydrology are rarely quantified in comparison with other stressors such as land use and physico-chemistry. Here we present a multiple stressor study that aims to disentangle the effect size...
Article
Full-text available
Abstract The Water Framework Directive (WFD) is a pioneering piece of legislation that aims to protect and enhance aquatic ecosystems and promote sustainable water use across Europe. There is growing concern that the objective of good status, or higher, in all EU waters by 2027 is a long way from being achieved in many countries. Through questionn...
Technical Report
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The EU FP 7 project MARS – “Managing Aquatic ecosystems and water Resources un- der multiple Stress” (duration 01.02.2014 – 31.01.2018) investigated how multiple human stressors affect rivers, lakes, groundwater, transitional and coastal waters. Outcomes of this research project are more than 200 scientific publications, more than 4000 pages of del...
Article
More often than not, rivers are impacted by multiple stressors imultaneously affecting water quality, ecological flow, habitat diversity and ultimately lotic biodiversity. Identifying individual stressors as specific causes of deterioration can help inform water managers about stressor hierarchy and appropriate management options. Here, we investi...
Article
Full-text available
Intermittent storage hydropower production is the only renewable source offering both, a sufficient storage potential and a high temporal flexibility in production to ensure grid stability. However, hydropeaking (generation of peak discharges by hydro‐electric operation) causes fluctuations in the wetted width, water depth, flow velocity and bottom...
Article
Worldwide, dams are a main threat reducing river ecological functioning and biodiversity by severely altering water temperature, flow, and sediment regimes up‐ and downstream. Sustainable dam management therefore has a key role in achieving ecological targets. Here we present an analysis of the effects of reservoir dams and resulting regime shifts...
Article
Rivers are among the most sensitive of all ecosystems to the effects of global change, but options to prevent, mitigate or restore ecosystem damage are still inadequately understood. Riparian buffers are widely advocated as a cost-effective option to manage impacts, but empirical evidence is yet to identify ideal riparian features (e.g. width, leng...
Article
The freshwater populations of native fish species (Ns) have reached critical levels in many parts of the world due to combined habitat deterioration by human interventions and exotic fish species (Es) invasions. These alarming conditions require combined and well-designed interventions for restoring environmental quality and restricting Es invasion...
Article
Interactions of multiple stressors in lotic systems have received growing interest and have been analysed in a growing number of studies using experiment and survey data. In this study, we present a protocol to identify, display and analyse stressors of rivers and their interactions (additive, synergistic or antagonistic). We used a dataset of 125...
Article
Within a heavily modified catchment, formerly polluted streams are now free of untreated wastewater. Additionally, the morphology of streams has been improved by physical habitat restoration. Both water quality and structural improvements offered a unique opportunity to investigate the recolonisation of restored sections by benthic macroinvertebrat...
Article
Freshwater ecosystems are impacted by a range of stressors arising from diverse human-caused land and water uses. Identifying the relative importance of single stressors and understanding how multiple stressors interact and jointly affect biology is crucial for River Basin Management. This study addressed multiple human-induced stressors and their...
Article
The Water Framework Directive (EU WFD, 2000/60EC, European Commission, 2000) is a comprehensive tool for water management taking Europe’s diverse national and local policy contexts into account. This has positioned the EU WFD as a potential tool to enhance the implementation of the globally-promoted integrated water resources management concept (IW...
Technical Report
Full-text available
This deliverable gives an overview of the functionality of the Freshwater Information System (FIS) through a number of screenshots and a short explanatory text. FIS is one of the tools that are developed within the MARS project. It is the web-based information system providing access to information and practical tools generated in MARS. FIS contain...
Article
The Lake Kinneret watershed (LKW) is an important freshwater resource in Israel, providing a myriad of water-dependent ecosystem services. Presently, environmental monitoring of the LKW is focused mainly on water quality and quantity parameters, but neglect biology. To fill this gap, a reference-based biological monitoring scheme is being developed...
Technical Report
Full-text available
In the previous report (D4.1, September 2016) we have developed predictive linkages between indicators of environmental quality and ecosystem services, and different types of pressures, single or multiple, across river basins from all over Europe, in a latitudinal and a west-east gradient, and having very different conditions of climate and land us...
Technical Report
Full-text available
D6.1-1 Summary: Currently, practical management of water bodies focuses on the control of single stressors which are assumed to be dominant. Work by the MARS project and others using ecosystem scale and experimental observations has demonstrated that the relationships between primary stressors and ecological response indicators can be confounded th...
Technical Report
Full-text available
Summary D6.1-1: Currently, practical management of water bodies focuses on the control of single stressors which are assumed to be dominant. Work by the MARS project and others using ecosystem scale and experimental observations has demonstrated that the relationships between primary stressors and ecological response indicators can be confounded th...
Article
Full-text available
Current observed as well as projected changes in biodiversity are the result of multiple interacting factors, with land use and climate change often marked as most important drivers. We aimed to disentangle the separate impacts of these two for sets of vascular plant, bird, butterfly and dragonfly species listed as characteristic for European dry g...
Article
The operation of storage hydropower plants is commonly linked to frequent fluctuations in discharge and water level (hydropeaking) of downstream river stretches and is often accompanied by cooling or warming of the water body downstream (cold or warm thermopeaking, respectively). The objective of this study is to assess the single and combined effe...
Article
Full-text available
Species distribution Modelling (SDM) constitutes a useful tool to predict the distribution of freshwater species based on selected habitat variables. Model performance (goodness-of-fit) expressed as coefficient of determination is straightforward to judge on SDM quality but does not sufficiently address predictive success. Hence, predictive perform...
Article
Full-text available
Environmental stressors present a hierarchical influence on freshwater organisms. This study investigates the hierarchy of environmental stressor gradients, which regulate the composition of instream macroinvertebrate communities of northern Italy (Po Valley and the south-eastern Alps). Species and environmental data were derived from 585 monitorin...
Article
Worldwide, lotic ecosystems are heavily impacted by anthropogenic disturbance, leading to a significant decline in freshwater biodiversity. In recent years, increasing efforts have been directed towards the restoration and revitalization of disturbed streams and rivers to reverse this trend. Although it is widely acknowledged that species dispersal...
Article
Species distribution models (SDMs) allow the prediction of the spatially explicit presence and absence of species based on environmental predictors that reflect the species' habitat requirements. In river macroinvertebrates, the habitat is often defined at very fine scales spanning one to several tens of square meters (e.g., substrate preferences)....
Article
Lotic ecosystems worldwide are being increasingly modified hydromorphologically, for example, by damming, fragmentation, flow regulation and channel modification. Serious threats to riverine biodiversity are suspected, yet available field data are few and rarely address the various taxonomic, functional and phylogenetic components of biodiversity.W...
Article
Full-text available
Aquatic insects are widely used as indicator taxa to assess the ecological state of streams and to evaluate the success of stream restoration projects. Information on intraspecific genetic diversity and population connectivity is often lacking for such indicator taxa. However, these parameters are of critical importance for restoration plans and co...
Article
Summary1. Although many studies have focussed on the effects of catchment land use on lotic systems, the importance of broad (catchment) and fine (segment/reach) scale effects on stream assemblages remain poorly understood.2. Nine biological metrics for macrophytes (498 sites), benthic macroinvertebrates (491) and fish (478) of lowland and mountain...
Article
Full-text available
The EU-funded research project WISER (“Water bodies in Europe: Integrative Systems to assess Ecological status and Recovery”) developed new assessment methods required by the EU Water Framework Directive (WFD) for lakes, coastal and transitional waters. WISER also addressed the recovery of biotic assemblages from degradation. The results are summar...
Article
River restoration is a central issue of present-day River Basin Management. Unfortunately, many studies have shown limited ecological improvements, hypothesizing catchment influences and missing donor populations as main impeding factors. This study evaluates the ecological status after restoration at 46 river reaches in light of catchment influenc...
Article
Full-text available
The majority of studies comparing the response of biotic metrics to environmental stress in rivers are based on relatively small, homogeneous datasets resulting from research projects. Here, we used a large dataset from Austrian and German national river monitoring programmes (2,302 sites) to analyse the response of fish, diatom and macroinvertebra...
Article
Full-text available
The European Water Framework Direc-tive aims to improve ecological status within river basins. This requires knowledge of responses of aquatic assemblages to recovery processes that occur after measures have been taken to reduce major stressors. A systematic literature review compara-tively assesses recovery measures across the four major water cat...
Article
Full-text available
Data on phytoplankton, macrophytes, ben-thic invertebrates and fish from more than 2000 lakes in 22 European countries were used to develop and test metrics for assessing the ecological status of European lakes as required by the Water Framework Directive. The strongest and most sensitive of the 11 metrics responding to eutrophication pressure were...
Article
Full-text available
Catchment wide integrated basin management requires knowledge on cause-effect and recovery chains within water bodies as well as on the interactions between water bodies and categories. In the WISER WP6.4 recovery processes in rivers, lakes and estuarine and coastal waters were evaluated. The major objectives were: - to analyse and compare (cause-e...
Article
Extensive degradation of ecosystems, combined with the increasing demands placed on the goods and services they provide, is a major driver of biodiversity loss on a global scale. In particular, the severe degradation of large rivers, their catchments, floodplains and lower estuarine reaches has been ongoing for many centuries, and the consequences...
Article
Full-text available
The report presented in the following is part of the outcome of WISER’s river Workpackage WP5.1 and as such part of the module on aquatic ecosystem management and restoration. The ultimate goal of WP5.1 is to provide guidance on best practice restoration and management to the practitioners in River Basin Management. Therefore, a series of analyses...
Article
Full-text available
This article comprises a literature analysis of 41 river rehabilitation projects to assess the short-term (5years) ability of indicator groups to demonstrate progress towards river rehabilitation goals. Positive indications were compared to land-use, river size, rehabilitation intervention and time. A questionnaire was developed to investigate rive...
Article
Full-text available
Cross border co-operation is increasingly viewed as an obvious and logical consequence of an integrated perspective on river management. Consequently, we would expect an increase of cross border co-operation and collaboration in EU member states, through joint planning, co-management or co-implementation in flooding policies, water quality manageme...
Article
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Using a range of different methods including extensive reviews, workshops and an electronic conference, 70 key research recommendations and 12 priority research needs to integrate the ecosystem services approach into biodiversity conservation policy and funding were identified by a cross-disciplinary group of over 100 scientists and 50 stakeholders...
Article
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The RUBICODE project draws on expertise from a range of disciplines to develop and integrate frameworks for assessing the impacts of environmental change on ecosystem service provision, and for rationalising biodiversity conservation in that light. With such diverse expertise and concepts involved, interested parties will not be familiar with all t...