Patrick Fink

Patrick Fink
Helmholtz-Zentrum für Umweltforschung | UFZ · Department of River Ecology

PD Dr. rer. nat.

About

104
Publications
19,549
Reads
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1,705
Citations
Citations since 2016
67 Research Items
1195 Citations
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
2016201720182019202020212022050100150200250
Introduction
Aquatic chemical ecologist with major research interest on adaptations (behavioural, physiological and phenotypic plasticity as well as evolution) of aquatic organisms to environmental change and heterogeneity.
Additional affiliations
October 2017 - present
University of Cologne
Position
  • Group Leader
April 2015 - September 2017
Heinrich-Heine-Universität Düsseldorf
Position
  • Chair
October 2006 - March 2015
University of Cologne
Position
  • Professor (Assistant)
Education
October 1998 - October 2001
University of Konstanz
Field of study
  • Biology
October 1996 - September 1998
University of Tuebingen
Field of study
  • Biology

Publications

Publications (104)
Article
It is widely accepted that in many food webs the trophic transfer efficiency among primary producers and herbivores is determined by the nutritional value of primary producers. In pelagic freshwater and marine ecosystems, secondary production by herbivorous crustacean zooplankton is often limited by the seston's content of essential ω3 polyunsatura...
Article
Full-text available
While it is crucial to understand the factors that determine the biodiversity of primary producer communities, the relative importance of bottom-up and top-down control factors is still poorly understood. Using freshwater benthic algal communities in the laboratory as a model system, we find an unimodal relationship between nutrient availability an...
Article
Full-text available
An increasing number of studies use next generation sequencing (NGS) to analyze complex communities, but is the method sensitive enough when it comes to identification and quantification of species? We compared NGS with morphology-based identification methods in an analysis of microalgal (periphyton) communities. We conducted a mesocosm experiment...
Article
Synthetic insect repellents are compounds applied to surfaces to discourage insects, mainly mosquitoes, from landing on those surfaces. As some of these repellents have repeatedly been detected in surface waters at significant concentrations, they may also exert repellent effects on aquatic non-target organisms. In running water systems, aquatic in...
Article
1.Foraging success generally depends on various environmental and physiological factors. Particularly for organisms with limited motility such as gastropods, food searching is a very cost-intensive process. As energy gain through foraging is dependent on both resource quality and quantity, consumers have to be able to differentiate between varying...
Article
Lipids and fatty acids are key dietary components for the nutrition of organisms at all trophic levels. They are required to build cellular structures, such as cell membranes, serve as energy storage and are taking part in signal transduction cascades. For decades, ecological research investigated how dietary fatty acid availability contributes to...
Article
Volatiles are important ‘infochemicals’ that play a crucial role in structuring life on our planet, fulfilling diverse functions in natural and artificial systems. Algae contribute significant quantities to the global budget of volatiles, but the ecological roles of aquatic volatiles are not well understood. In this review, we discuss the current k...
Article
The nutritional quality of phytoplankton is essential for the fitness of herbivorous zooplankton and for efficient carbon fluxes in pelagic ecosystems. In freshwater lakes, cladocerans and calanoid copepods are the main pelagic herbivores in terms of both numbers and grazing impact. However, most studies focused on the easily cultivable cladocerans...
Article
Full-text available
A new cultivation system with the chlorophyte Monoraphidium contortum combined with a self-sustaining culture of the freshwater rotifer Brachionus calyciflorus was applied for Sander lucioperca (L.) larviculture. Survival, morphometrics, as well as fatty acid composition of pikeperch larvae were analyzed after a ten-day feeding period. By using the...
Article
Full-text available
Chemical communication via infochemicals plays a pivotal role in ecological interactions, allowing organisms to sense their environment, locate predators, food, habitats, or mates. A growing number of studies suggest that climate change‐associated stressors can modify these chemically mediated interactions, causing info‐disruption that scales up to...
Article
Full-text available
Communication among marine organisms are generally based on production, transmission, and interpretation of chemical cues. Volatile organic compounds (VOCs) can act as infochemicals, and ocean acidification can alter their production in the source organisms as well as the interpretation of the information they drive to target organisms. Two diatoms...
Article
Full-text available
The recent emergence of approaches based on functional traits allows a more comprehensive evaluation of the role of functions and interactions within communities. As phytoplankton size and shape are the major determinants of its edibility to herbivores, alteration or loss of some morpho-functional phytoplankton traits should affect zooplankton graz...
Article
Full-text available
Algal biofilms in streams are simultaneously controlled by light and nutrient availability (bottom-up control) and by grazing activity (top-down control). In addition to promoting algal growth, light and nutrients also determine the nutritional quality of algae for grazers. While short-term experiments have shown that grazers increase consumption r...
Article
The assessment of the exposure of aquatic wildlife to complex environmental mixtures of chemicals originating from both point and diffuse sources and evaluating the potential impact thereof constitutes a significant step towards mitigating toxic pressure and the improvement of ecological status. In the current proof-of-concept study, we demonstrate...
Article
Full-text available
Spatial variations in light and nutrient availability usually lead to a heterogeneous distribution of periphyton biomass within streams, but the effects of nutrient enrichment on periphyton heterogeneity are still poorly understood. We tested phosphorus enrichment effects on the heterogeneity of periphyton quantity and nutritional quality in an env...
Article
Full-text available
Fungicides pose a risk for crustacean leaf shredders serving as key-stone species for leaf litter breakdown in detritus-based stream ecosystems. However, little is known about the impact of strobilurin fungicides on shredders, even though they are presumed to be the most hazardous fungicide class for aquafauna. Therefore, we assessed the impact of...
Article
Antimicrobials, such as fungicides and antibiotics, pose a risk for microbial decomposers (i.e., bacteria and aquatic fungi) and invertebrate detritivores (i.e., shredders) that play a pivotal role in the ecosystem function of leaf litter breakdown. Although waterborne toxicity and diet-related effects (i.e., dietary exposure and microorganism-medi...
Article
Full-text available
• Functional traits are measurable characteristics of an organism that have an impact on its fitness. Variation in functional traits between and among species has been suggested to represent the basis for competition and selection, thus allowing for evolution in natural populations. • In freshwater ecosystems, the availability of essential polyunsa...
Article
Invasion of non‐native species in freshwater ecosystems often alters the indigenous macroinvertebrate community and food web structure by changing the resource availability. One of these species is the invasive amphipod Dikerogammarus villosus, whose impact by predation, especially on coexisting amphipods, is still under debate. In this study, we a...
Article
Full-text available
Determining the lipid content and fatty acid (FA) composition of aquatic organisms has been of major interest in trophic ecology, aquaculture, and nutrition for over half a century. Although protocols for lipid analysis are well-described, their application to aquatic sciences often requires modifications to adapt to field conditions and to sample...
Article
Full-text available
By 2100, global warming is predicted to significantly reduce the capacity of marine primary producers for long-chain polyunsaturated fatty acid (LC-PUFA) synthesis. Primary consumers such as harpacticoid copepods (Crustacea) might mitigate the resulting adverse effects on the food web by increased LC-PUFA bioconversion. Here, we present a high-qual...
Article
Full-text available
Phosphorus enrichment of stream ecosystems generally increases primary production in the benthos, but the consequences of eutrophication for the nutritional quality of periphyton for grazers are less clear. On short time scales, high phosphorus inputs may lead to reduced C:P ratios and high essential fatty acid contents of periphyton, which are bot...
Article
Ocean acidification (OA) influences the production of volatile organic compounds (VOCs) by seagrass leaves and their associated epiphytes. We hypothesize that the perception of "odour" produced by seagrass leaf epiphytes will change with seawater acidification, affecting the behaviour of seagrass-associated invertebrates. To test this hypothesis, w...
Article
Full-text available
Light is an important factor for the growth of planktonic organisms, and many of them depend on the diurnal light/dark cycle to regulate key metabolic processes. So far, most of the diel responses were only studied in single species or marine and large lake communities. Yet, we lack information on whether these processes are regulated similarly in...
Article
Antibiotics may constitute a risk for aquatic detritivorous macroinvertebrates (i.e., shredders) via waterborne and dietary antibiotic exposure. In addition, antibiotics can alter the food quality for shredders mediated by shifts in leaf-associated decomposer (i.e., aquatic fungi and bacteria) communities. However, little is known about the relativ...
Article
Full-text available
A key research aim for lotic ecosystems is the identification of natural and anthropogenic pressures that impact ecosystem status and functions. As a consequence of these perturbations, many lotic ecosystems are exposed to complex combinations of non‐chemical and chemical stressors. These stressors comprise temperature fluctuations, flow alteration...
Article
Full-text available
Eicosanoids are an important class of signalling molecules derived from essential polyunsaturated fatty acids (PUFAs). Some recent research had started to investigate the eicosanoid pathway in Daphnia magna, but focussed mostly on the role of omega-6 PUFAs, rather than on the nutritionally important omega-3 PUFA eicosapentaenoic acid (EPA), which i...
Preprint
Background: Differences in the trophic niche often underlie ecological specialization of individuals and can promote ecological speciation of populations, but studies showing a link between differences in the trophic niche and genetic differentiation of populations are rare. On the island of San Cristóbal (Galapágos archipelago), a strong genetic d...
Article
Full-text available
Background: Nutritional quality of phytoplankton is a major determinant of the trophic transfer efficiency at the plant-herbivore interface in freshwater food webs. In particular, the phytoplankton's content of the essential polyunsaturated omega-3 fatty acid eicosapentaenoic acid (EPA) has been repeatedly shown to limit secondary production in th...
Article
Full-text available
Secondary production in freshwater zooplankton is frequently limited by the food quality of phytoplankton. One important parameter of phytoplankton food quality are essential polyunsaturated fatty acids (PUFAs). Since the fatty acid composition of phytoplankton is variable and depends on the algae’s nutrient supply status, inorganic nutrient supply...
Preprint
Full-text available
Background: Nutritional quality of phytoplankton is a major determinant of the trophic transfer efficiency at the plant-herbivore interface in freshwater food webs. In particular, the phytoplankton’s content of the essential polyunsaturated omega-3 fatty acid eicosapentaenoic acid (EPA) has been repeatedly shown to limit secondary production in the...
Preprint
Full-text available
Background: Nutritional quality of phytoplankton is a major determinant of the trophic transfer efficiency at the plant-herbivore interface in freshwater food webs. In particular, the phytoplankton’s content of the essential polyunsaturated omega-3 fatty acid eicosapentaenoic acid (EPA) has been repeatedly shown to limit secondary production in the...
Article
Full-text available
Periphytic biofilms are the major resource for many herbivorous invertebrates in both marine and freshwater benthos. They are of crucial importance for benthic food webs, substrate stability and biogeochemical processes in littoral zones. While the importance of invertebrate grazing on biofilms has been studied extensively using natural, mixed alga...
Preprint
Full-text available
Background: Nutritional quality of Phytoplankton is the major determinant of the trophic transfer efficiency at the plant-herbivore interface in freshwater food webs. In particular, the phytoplankton’s content of the essential polyunsaturated omega-3 fatty acid eicosapentaenoic acid (EPA) has been repeatedly shown to limit secondary production in t...
Preprint
Full-text available
By 2100, global warming is predicted to significantly reduce the capacity of marine primary producers for long-chain polyunsaturated fatty acid (LC-PUFAs) synthesis. Primary consumers such as harpacticoid copepods (Crustacea) might mitigate the resulting adverse effects on the food web by increased LC-PUFA bioconversion. Here, we present a high-qua...
Article
Full-text available
“Infochemicals” (information-conveying chemicals) dominate much of the underwater communication in biological systems. They influence the movement and behavior of organisms, the ecological interactions between and across populations, and the trophic structure of marine food webs. However, relative to their terrestrial equivalents, the wider ecologi...
Article
Full-text available
Larvae of the caridean shrimp Hippolyte inermis persist in the plankton of the Mediterranean up to about one month. Since they need to reach appropriate coastal areas for their recruitment in seagrass meadows, we hypothesized that leaves of Posidonia oceanica or, alternatively, algae present in their epiphytic biofilms, might be physically recognis...
Preprint
Background: Phytoplankton dietary quality is the major determinant of the trophic transfer efficiency at the plant-herbivore interface in freshwater food webs. In particular, the phytoplankton’s content of the essential polyunsaturated omega-3 fatty acid eicosapentaenoic acid (EPA) has repeatedly been shown to determine the secondary production in...
Article
Full-text available
Essential polyunsaturated fatty acids (PUFAs) have been recognized as a crucial factor that determines the trophic transfer efficiency in plankton communities. As many animals cannot synthesize the classes of ω3‐ and ω6‐PUFAs, the dietary availability of these PUFAs can constrain the fitness of freshwater zooplankton such as Daphnia spp. In particu...
Article
• Assessing the conservation status of a species is strongly dependent upon data on species distribution and abundance. With the emergence of novel methods for species monitoring – such as the use of environmental DNA (eDNA) – monitoring success can be improved at reduced expenditure in the field, particularly in remote regions and terrains where a...
Article
• Benthic algal biomass and distribution in freshwater ecosystems are determined by both nutrient availability (bottom‐up control) and grazing activity by herbivores (top‐down control). Fluctuations in algal nutrient ratios may cause grazers to optimise their food intake through behavioural strategies in order to maintain a constant soft body stoic...
Article
Full-text available
The geological, hydrological and microbiological features of the Salar de Atacama, the most extensive evaporitic sedimentary basin in the Atacama Desert of northern Chile, have been extensively studied. In contrast, relatively little attention has been paid to the composition and roles of microbial communities in hypersaline lakes which are a uniqu...
Article
Full-text available
In aquatic food webs, global warming may affect higher trophic levels by increased surface water temperatures and by changing the biochemical composition of phytoplankton. Correlations have suggested that growth of Daphnia, a major consumer of phytoplankton in freshwaters, is limited by a low content of the polyunsaturated fatty acid eicosapentaeno...
Article
Unidirectional drift is amongst the most relevant population regulators in riverine animal populations. Drift occurs randomly, but it can also be a behavioural response to abiotic and biotic stressors, or the result of catastrophic events such as heavy rain. In this study, we investigate the spatiotemporal distribution of larvae of the fire salaman...
Article
Food quality is an important factor influencing organisms' well-being. In freshwater ecosystems, food quality has been studied extensively for the keystone herbivore genus Daphnia, as they form the critical trophic link between primary producers and higher order consumers such as fish. For Daphnia, the edible fraction of phytoplankton in lakes (con...
Article
Full-text available
Insect repellents are widely applied to various materials and to both human and animal skin to deter mosquitoes and ticks. The most common deterrent compounds applied are DEET, EBAAP and icaridin (picaridin, Bayrepel). Due to their extensive application, these repellents are frequently detected in surface waters in considerable concentrations. As t...
Article
Full-text available
Background Mass occurrences of cyanobacteria frequently cause detrimental effects to the functioning of aquatic ecosystems. Consequently, attempts haven been made to control cyanobacterial blooms through naturally co-occurring herbivores. Control of cyanobacteria through herbivores often appears to be constrained by their low dietary quality, rathe...
Data
Workflow of experimental pipeline. The major bioinformatics steps of the experimental pipeline. (TIF)
Data
Experimental setup. To ensure equal grazing pressure in all units, equal fresh weight of the consumer species were added. (DOCX)
Data
Rarefaction curve of all OTUs clustered at 99% identity in the four grazer treatments: C = Grazer-free control, M = C. dipterum (Mayfly), S = L. stagnalis (Snail), MIX = C. dipterum and L. stagnalis. (TIF)
Data
Impact of grazing on single algal species based on microscope counts. Bars represent mean (± SD) algal cell numbers in the different treatments: C = Grazer-free control, M = C. dipterum (Mayfly), S = L. stagnalis (Snail), MIX = C. dipterum and L. stagnalis. Means that were found to be significantly different after post-hoc comparisons are labeled w...
Data
Mean (± SD of n = 3) algal dry mass dependent on the consumer treatment: C = grazer-free control, M = C. dipterum (Mayfly), S = L. stagnalis (Snail), MIX = C. dipterum and L. stagnalis. One-way ANOVA (d.f. = 11, F = 3.31, P = 0.08, N = 3). (TIF)
Data
The average primary producer community composition (including cyanobacteria) based on cell number (a) and biovolume (b), determined microscopically in relation to the consumer treatment: C = Grazer-free control, M = C. dipterum (Mayfly), S = L. stagnalis (Snail), MIX = C. dipterum and L. stagnalis. (TIF)
Data
P-values derived from Tukey post-hoc comparisons regarding the effect of grazing on the cell number of single algal taxa in the treatments: C = Grazer-free control, M = C. dipterum (Mayfly), S = L. stagnalis (Snail), MIX = C. dipterum and L. stagnalis). (DOCX)
Data
The effect of consumer species richness on primary producer richness. Primary producer species richness a) and OTU richness b) (N = 3) after grazing by 0–2 consumer species over a period of 50 days. The results of the linear regression are represented as a solid line. The four treatments are labeled C = Grazer-free control, M = C. dipterum (Mayfly)...
Data
The primary producer species detected using the morphology-based method and the molecular method, and taxa detected using both methods. If taxa were detected at higher taxonomic rank using the alternative method, the higher taxonomic rank is noted up to family level. (DOCX)
Article
Full-text available
Leaf litter is a major source of carbon and energy for stream food webs, while both leaf-decomposing microorganisms as well as macroinvertebrate leaf-shredders can be affected by fungicides. Despite the potential for season-long fungicide exposure for these organisms, such chronic exposures have, however, not yet been considered. Using an artificia...
Article
Full-text available
Chemical communications among plant and animal components are fundamental elements for the functioning and the connectivity of ecosystems. In particular, wound-activated infochemicals trigger specifi c reactions of invertebrates according to evolutionary constraints, permitting them to identify prey cues, escape predators and optimize their behavio...
Article
Full-text available
The balanced-diet hypothesis states that a diverse prey community is beneficial to consumers due to resource complementarity among the prey species. Nonselective consumer species cannot differentiate between prey items and are therefore not able to actively regulate their diet intake. We thus wanted to test whether the balanced-diet hypothesis is a...
Data
Somatic growth rates and shell heights. A table including the raw data of somatic growth rates and shell height of the snails used in the experiment. (XLSX)
Article
Full-text available
The genetic background of inducible morphological defences in Daphnia is still largely unknown. Dissolved infochemicals from the aquatic larvae of the phantom midge Chaoborus induce so called 'neck-teeth' in the first three postembryonic stages of Daphnia pulex. This defence has become a textbook example for inducible defences. In a target gene app...