Julia Reiss

Julia Reiss
University of Roehampton | RU · Department of Life Sciences

PhD

About

49
Publications
9,549
Reads
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2,037
Citations
Introduction
I am a freshwater biologist with an interest in ecological theory and the taxonomy and ecology of aquatic invertebrates (e.g. microscopic animals).
Additional affiliations
September 2010 - present
University of Roehampton
Position
  • Professor (Associate)
January 2007 - September 2010
Queen Mary, University of London
Position
  • PostDoc Position

Publications

Publications (49)
Article
Full-text available
Use of antibiotics for the treatment and prevention of bacterial infections in humans, agri- and aquaculture as well as livestock rearing leads to antibiotic pollution of fresh water and these antibiotics have an impact on free-living bacteria. While we know which antibiotics are most common in natural environments such as rivers and streams, there...
Chapter
Protozoans and microscopically small invertebrates are omnipresent in aquatic systems but, arguably, under-studied, and this is true when it comes to one of the best described ecosystem processes in fresh water—leaf litter decomposition. However, over the last ten years research has been emerging that points to the important role of these microbes...
Chapter
Microcosm studies are a useful tool when it comes to studying leaf litter decomposition but designing and analysing them can be a tricky path with many pitfalls. Because there is a plethora of drivers of leaf decomposition, it is important to be precise about the scientific questions that can be addressed with microcosm set-ups, and to use experime...
Article
The relationship between body mass (M) and size class abundance (N) depicts patterns of community structure and energy flow through food webs. While the general assumption is that M and N scale linearly (on log–log axes), nonlinearity is regularly observed in natural systems, and is theorized to be driven by nonlinear scaling of trophic level (TL)...
Article
Full-text available
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
Article
Full-text available
Litter breakdown in the streambed is an important pathway in organic carbon cycling and energy transfer in the biosphere that is mediated by a wide range of streambed organisms. However, most research on litter breakdown to date has focused on a small fraction of the taxa that drive it (e.g. microbial versus macroinvertebrate mediated breakdown) an...
Article
Worldwide, antibiotic usage exceeds 100,000 tons per year and there is increasing concern over the fate of these substances. Antibiotics are ubiquitous in the environment and significant concentrations have been detected in fresh waters. In this review, we highlight important aspects of antibiotic pollution in fresh waters: that concentrations of a...
Chapter
Organisms that are invisible to the naked eye are the most abundant component of any freshwater community. These tiny organisms span domains and phyla and include viruses, prokaryotes (archae and bacteria), protists (single-celled eukaryotes such as single-celled fungi, algae, and protozoans) and multicellular fungi and microscopic metazoans (such...
Chapter
Organisms that are invisible to the naked eye are the most abundant component of any freshwater community. These tiny organisms span domains and phyla and include viruses, prokaryotes (archae and bacteria), protists (single-celled eukaryotes such as single-celled fungi, algae, and protozoans) and multicellular fungi and microscopic metazoans (such...
Article
Full-text available
A current controversy in ecology is whether biological communities are discrete biological entities or simply study units created for convenience; a debate that becomes even more heated when delimiting communities along ecotones. Here, we report an interdisciplinary study designed to address the interplay between environmental drivers and community...
Article
Full-text available
1) Aquifers are recharged by surface water percolating through soil and rock and by connections with surface streams and rivers. Extreme rainfall can cause extensive flooding of surface waters and, eventually, of groundwaters. However, how the resultant changes in nutrients impact groundwater organisms and the structure of groundwater food webs is...
Article
1)We describe the hierarchical interplay of hydrology, hyporheic ecology and transformation of nutrients and pollutants in the hyporheic zone (HZ). The exchange of water between the surface-subsurface generates the hyporheic exchange flow: the engine that drives the ecological functioning of the HZ. The magnitude and direction of hydrological fluxe...
Article
Full-text available
Groundwater ecosystems comprising micro-organisms and metazoans provide an important contribution to global biodiversity. Their complexity depends on geology, which determines the physical habitat available, and the chemical conditions within it. Despite this, methods of classifying groundwater habitats using geological data are not well establishe...
Article
Full-text available
Habitat complexity can influence predation rates (e.g. by providing refuge) but other ecosystem processes and species interactions might also be modulated by the properties of habitat structure. Here, we focussed on how complexity of artificial habitat (plastic plants), in microcosms, influenced short-term processes driven by three aquatic detritiv...
Data
R codes. R codes used to analyze the experiment with a worked example. (DOCX)
Data
Data. An overview of predictors and responses. (DOCX)
Data
Collection B ANOVA additional analyses. pH was measured throughout the experiment and ‘amount’ significantly influenced this response. Two examples are given here in the original R output. Comparing this to Table 2 shows how the ANOVA table was build. (DOCX)
Conference Paper
Food web models provide a useful tool to assess the organization and complexity of natural communities. We condensed an 8-year dataset to examine changes in the diversity and food web properties (complexity and topology) of a sub-tropical coastal lagoon community, and their relationship with environmental variables, over an idealised time series fo...
Article
Full-text available
Biodiversity loss is occurring rapidly worldwide, yet it is uncertain whether few or many species are required to sustain ecosystem functioning in the face of environmental change. The importance of biodiversity might be enhanced when multiple ecosystem processes (termed multifunctionality) and environmental contexts are considered, yet no studies...
Data
Data S1.Length–mass equations for consumer species and analysis of control data. Figure S1. Temporal measurement of ammonium (NH4+) stocks. Figure S2. Hierarchy of statistical models tested in the analysis of single ecosystem processes. Figure S3. The effects of species richness on ecosystem processes. Figure S4. The effects of environmental temper...
Article
It is now widely believed that biological diversity is good for the natural environment. One way that ecologists test this is to place random collections of species in mini-environments and then measure some outcome. Statisticians have been working with fresh-water ecologists to improve this in two ways. The first is that the subsets of species are...
Article
Full-text available
Ecosystem respiration is a primary component of the carbon cycle and understanding the mechanisms that determine its temperature dependence will be important for predicting how rates of carbon efflux might respond to global warming. We used a rare model system, comprising a network of geothermally heated streams ranging in tempera-ture from 5 °C to...
Poster
Full-text available
The Hyporheic Zone (HZ) in streams and rivers has been defined in many ways but a central theme in all definitions is that water exchanges between the open channel and ground water systems. Therefore, a knowledge of hydrodynamics is essential for ecologists wanting to understand the flow of energy, cycling of nutrients and pollutants breakdown in t...
Article
1. Numerous studies have revealed (usually positive) relationships between biodiversity and ecosystem functioning (B-EF), but the underpinning drivers are rarely addressed explicitly, hindering the development of a more predictive understanding. 2. We developed a suite of statistical models (where we combined existing models with novel ones) to tes...
Article
Understanding how ecological communities are structured and how this may vary between diff erent types of ecosystems is a fundamental question in ecology. We develop a general framework for quantifying size-structure within and among diff erent ecosystem types (e.g. terrestrial, freshwater or marine), via the use of a suite of bivariate relationshi...
Article
1. Protozoans are important consumers within microbial food webs and, in turn, they represent potential prey for small metazoans. However, feeding interactions within these food webs are rarely characterised and this is especially true for freshwater sediments. 2. We aimed to quantify the feeding links between a freshwater meiofaunal copepod and ci...
Article
1. It is becoming increasingly clear that fresh waters play a major role in the global C cycle. Stream ecosystem respiration (ER) and gross primary productivity (GPP) exert a significant control on organic carbon fluxes in fluvial networks. However, little is known about how climate change will influence these fluxes. 2. Here, we used a ‘natural ex...
Article
A large body of research has revealed (often) positive biodiversity–ecosystem functioning (B–EF) relationships in manipulative experiments. The vast majority of such studies have focused on either micro- or macro-organisms, and none we are aware of have manipulated the diversity of both simultaneously under controlled laboratory conditions. We perf...
Article
Free-living protists and very small metazoans, such as meiofauna or mesozooplankton, are extremely abundant in aquatic habitats and they play a key role in numerous ecosystem processes, including nutrient cycling and supplying energy to higher trophic levels. Assessing their ecological roles is needed to understand natural systems in their own righ...
Article
Predicting the effects of global warming on biodiversity–ecosystem functioning (B–EF) relationships is complicated by potential interactions among abiotic and biotic variables at multiple levels of organisation, including adaptation within regional species populations and changes in community composition and species richness. We investigated the ca...
Article
Full-text available
Riverine habitats are vulnerable to a host of environmental stressors, many of which are increasing in frequency and intensity across the globe. Climate change is arguably the greatest threat on the horizon, with serious implications for freshwater food webs via alterations in thermal regimes, resource quality and availability, and hydrology. This...
Article
Full-text available
Periphyton harbours a complex microbial food web with different trophic levels, but little is known about trophic interactions within this food web and its response to factors that potentially control the entire community. We used natural periphyton communities from Lake Erken (Sweden) in 2 experiments manipulating grazer presence. In addition to a...
Conference Paper
Background/Question/Methods The Earth is experiencing historically unprecedented rates of warming, with surface temperatures projected to increase by 3-5°C globally, and up to 7.5°C in high latitudes, within the next century. Additional stressors are associated with global warming in fresh waters, including an increase in the intensity and duratio...
Article
Full-text available
The production of heterotrophic biomass is an important aspect of overall ecosystem functioning. However, single-celled organisms or microscopic metazoans are often ignored in studies of secondary production, despite being very abundant and possessing high mass-specific population growth rates, relative to the more widely studied larger taxa. Here,...
Article
Full-text available
Predicting the effects of global warming on biodiversity–ecosystem functioning (B–EF) relationships is complicated by potential interactions among abiotic and biotic variables at multiple levels of organisation, including adaptation within regional species populations and changes in community composition and species richness. We investigated the ca...
Article
Two decades of intensive research have provided compelling evidence for a link between biodiversity and ecosystem functioning (B-EF). Whereas early B-EF research concentrated on species richness and single processes, recent studies have investigated different measures of both biodiversity and ecosystem functioning, such as functional diversity and...
Article
1. The ciliate and metazoan meiofaunal assemblages of two contrasting lowland streams in south-east England were examined over the period of a year, using a high taxonomic resolution. Monthly samples were taken from an oligotrophic, acid stream (Lone Oak) and a circumneutral, nutrient-rich stream (Pant) between March 2003 and February 2004. 2. We a...

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