Fabien Cremona

Fabien Cremona
Estonian University of Life Sciences | EMU · Institute of Agricultural and Environmental Sciences

Ph.D. Environmental Sciences

About

54
Publications
22,077
Reads
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778
Citations
Citations since 2017
27 Research Items
616 Citations
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Introduction
I am currently modelling food web structure, energy fluxes and and catchment-scale processes in European lakes, with a focus on lacustrine systems from Estonia.
Additional affiliations
January 2016 - present
Estonian University of Life Sciences
Position
  • Senior Researcher
September 2012 - December 2015
Estonian University of Life Sciences
Position
  • Researcher
January 2003 - June 2008
Université du Québec à Montréal
Position
  • Mercury transfer and littoral food webs structure of fluvial lakes
Education
January 2003 - June 2008
Université du Québec à Montréal
Field of study
  • Environmental Sciences
September 1997 - June 2002

Publications

Publications (54)
Article
Full-text available
We aimed to investigate the influence of environmental factors and predict zooplankton biomass and abundance in shallow eutrophic lakes. We employed time series of zooplankton and environmental parameters that were measured monthly during 38 years in a large, shallow eutrophic lake in Estonia to build estimates of zooplankton community metrics (cla...
Article
Full-text available
We assessed long-term impacts of multiple stressors and their interaction on the zooplankton community of the large, eutrophic, cyanobacteria-dominated Lake Peipsi (Estonia, Russia). Stressor dataset consisted in time series (1997–2018) of temperature, nutrients, pH, water transparency, phytoplankton biomass and taxonomic richness. The best predict...
Article
We aimed to predict cyanobacteria biomass and nitrate (NO3⁻) concentrations in Lake Võrtsjärv, a large, shallow, and eutrophic lake in Estonia. We used a model chain based on the succession of a mechanistic (INCA-N) model and an empirical, generalized linear model. INCA-N model calibration and validation was performed with long term climate and cat...
Article
Full-text available
Nutrient monitoring is important for informing management decisions to mitigate eutrophication in aquatic systems. Many nutrient monitoring programs use filter pore sizes that allow microorganisms to pass into samples and/or wait extended times between sample collection and filtration/preservation, allowing microbial processes to alter nutrient con...
Article
Lakes are considered important regulators of atmospheric greenhouse gases (GHG). We estimated late summer open water GHG fluxes in nine hemiboreal lakes in Estonia classified under different lake types according to the European Water Framework Directive (WFD). We also used the WFD typology to provide an improved estimate of the total GHG emission f...
Presentation
Full-text available
We used a model chain to predict cyanobacteria biomass and nitrate (NO3-) concentrations in Lake Võrtsjärv (Estonia), a large, shallow, and eutrophic lake. The model chain was based on the succession of a mechanistic model (INCA-N) and an empirical, generalized linear model. Model calibration and validation were performed with long term climate and...
Presentation
Full-text available
We aimed to investigate the influence of environmental factors on zooplankton biomass and abundance in Lake Peipsi and Lake Võrtsjärv, two large, shallow eutrophic lakes in Estonia. We employed time series of zooplankton and environmental parameters that were measured monthly to build estimates of zooplankton community metrics (biomass, abundance)....
Article
Ecosystem models that measure the impact of quantitative interactions between trophic levels are widely used tools in ecosystem studies and fishery management. We constructed a mass-balance trophic model using an Ecopath with Ecosim (EwE) modelling suite for large shallow Lake Võrtsjärv, Estonia. The model was calibrated for 36 years (1983–2018) an...
Article
Climate change shows itself in many different ways on marine life. The fishery is also a part of marine life and affected by climate change-driven weather conditions directly or indirectly. In the present study, relationships between commercial species (grey mullet -≈90% of total capture- and gilthead seabream) that were captured from lagoon traps...
Article
Relationships between biomass and ecological factors including trophic interactions were examined to understand the dynamics of six fish species in Lake Võrtsjärv, a large shallow eutrophic lake located in Estonia (north-eastern Europe). The database contained initially 31 predictive variables that were monitored in situ for nearly forty years. The...
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
Changes in the ice phenology, seasonal temperature and extreme events are consistent evidence of climate change effect on lakes. In this study, we analyzed multiannual variability, determined long-term trends and detected changes in the frequency of extreme events in the surface water temperature (LSWT) of Lake Peipsi (Estonia/Russia) for nearly se...
Article
We numerically explored the effects of long-term water level changes on biotic biomass and spatial distribution of fish in a large shallow lake. We calibrated Ecospace model (Ecopath with Ecosim modelling suite) with data from various functional groups (ranging from phytoplankton to piscivorous fish), and considered 14 different habitats. Two scena...
Article
Full-text available
As part of a global phenomenon, a 30% decrease in average wind speed since 1996 in southern Estonia together with more frequent easterly winds resulted in 47% decrease in bottom shear stress in the large (270 km 2), shallow (mean depth 2.8 m), and eutrophic Lake Võrtsjärv. Following a peak in eutrophication pressure in the 1970s-80s, the concentrat...
Presentation
Full-text available
We calculated the allochthonous organic carbon (OC) mass balance for thirteen natural lakes using lake water budget, catchment features and water column chemistry variables as input of a process-based model. Parameter distribution and uncertainty of model outputs were assessed within a Bayesian framework.
Article
Full-text available
We assessed the allochthonous organic carbon (OC) budgets for thirteen hemiboreal lakes using a simple equilibrium model coupled with a Bayesian framework for estimating parameter distribution and uncertainty. Model inputs consisted of hydrological, bathymetric and chemical data that are easily measurable at the lake and basin scale. Among the mode...
Article
Theoretical pelagic primary production of phytoplankton and benthic primary production of periphyton were modelled for two small lakes in Estonia (Northeast Europe). Although located only 500 m apart, the water colour and light attenuation of these two lakes differed markedly. The Secchi depth (SD) in the clear‐water lake was 4.5 m and only 0.47 m...
Article
There are infinite possible future scenarios reflecting the impacts of anthropogenic multiple stress on our planet. These impacts include changes in climate and land cover, to which aquatic ecosystems are especially vulnerable. To assess plausible developments of the future state of European surface waters, we considered two climate scenarios and t...
Article
Full-text available
We modeled energy transfer and trophic position of fish, plankton, and macroinvertebrates and the relative importance of top-down versus bottom-up processes in Lake Võrtsjärv, a large shallow eutrophic lake in Estonia (northeastern Europe). We employed input values based on 37 years of biomass and fishing activity monitoring for calibrating the Eco...
Presentation
Full-text available
The objective of this study was to forecast the combined influence of three stressors (climate change, land use, water abstraction) on the phytoplankton (cyanobacteria) and zooplankton (rotifer) biomass of Lake Võrtsjärv, a large lake situated in Estonia (north-eastern Europe), for the mid-21st century (2030-2060)
Article
We aimed at quantifying the importance of limnological variables in the decadal rise of cyanobacteria biomass in shallow hemiboreal lakes. We constructed estimates of cyanobacteria (blue-green algae) biomass in a large, eutrophic lake (Estonia, Northeastern Europe) from a database comprising 28 limnological variables and spanning more than 50 years...
Article
We analysed changes in the abundance, biomass and cell size of the microbial food web community (bacteria, heterotrophic nanoflagellates, ciliates) at contrasting nutrient concentrations and temperatures during a simulated heat wave. We used 24 mesocosms mimicking shallow lakes in which two nutrient levels (unenriched and enriched by adding nitroge...
Article
Full-text available
We constructed a model chain into which regional climate-related variables (air temperature, precipitation) and a lake’s main tributary hydrological indicators (river flow, dissolved inorganic carbon) were employed for predicting the evolution of planktonic blue-green algae (cyanobacteria) and zooplankton (rotifer) biomass in that lake for the mid-...
Article
Full-text available
Autotrophic structure refers to the partitioning of whole-ecosystem primary production between benthic and planktonic primary producers. Autotrophic structure remains poorly understood especially because of the paucity of estimates regarding benthic primary production. We used a conceptual model for numerically exploring the autotrophic structure o...
Presentation
Full-text available
Pelagic primary production of phytoplankton and benthic primary production of periphyton were modelled in two small lakes of Estonia (north-east Europe). Although located only 500 m apart from each other, the water color and light attenuation of these two lakes differed markedly. Secchi depth in the clear-water lake was 4.5 and only 0.5 m in the da...
Technical Report
Full-text available
Deliverable D4.1 is a synthesis report of the 16 regional case studies being undertaken in WP4 (Multi-stressors at the river basin scale. The report is composed of 3 parts. Part 1: Task 4.2 - Southern Basins region Part 1 reports the background to, and results and conclusions from Task 4.2 on four case studies from the Southern Basins region. The...
Presentation
Full-text available
The main drivers of Hg accumulation in the periphyton biofilms in boreal Canadian Shield lakes are winter precipitation, summer temperature and harvest perturbations
Presentation
Full-text available
We employed a Bayesian model for assessing the metabolic state of eight Estonian lakes representing the eight lake types according to the European Union Water Framework Directive. Model input parameters were in situ high-frequency measurements of dissolved oxygen, temperature and irradiance. Model simulations were conducted for several diel cycles...
Article
We employed a Bayesian model to assess the metabolic state of 8 Estonian lakes representing the 8 lake types according to the European Union Water Framework Directive. We hypothesized that long-term averages of light-related variables would be better predictors of lake metabolism than nutrient-related variables. Model input parameters were in situ...
Article
Knowledge about dissolved oxygen (DO) and carbon dioxide (CO2) distribution in lakes has increased considerably over the last decades. However, studies about high resolution dynamics of dissolved CO2 in different types of lakes over daily or weekly time scales are still very scarce. We measured summertime vertical DO and CO2 profiles at sub-hourly...
Article
We employed a Bayesian model to assess the metabolic state of 8 Estonian lakes representing the 8 lake types according to the European Union Water Framework Directive. We hypothesized that long-term averages of light-related variables would be better predictors of lake metabolism than nutrient-related variables. Model input parameters were in situ...
Conference Paper
Full-text available
The distribution of whole-lake primary production between planktonic and benthic habitat, also called autotrophic structure, carries critical information about lake food web layout and organic matter fluxes. Although planktonic primary production has been intensively studied since the onset of limnology, the paucity of estimates for benthic product...
Conference Paper
Full-text available
Nowadays automated monitoring buoys are widely applied. Day-to-day variation and distribution of dissolved oxygen (DO) in different lake types is already well known. However, data on dissolved CO2 are still rare, because the relatively low reliability and accuracy and high price of CO2 sensors. Recently, the usage of CO2 sensors has increased altho...
Conference Paper
Full-text available
Tracing of O2 fluxes and ecological parameters fluctuations within very short periods of time have been facilitated by the development of high-frequency measurements in lakes. The parallel advent of robust metabolic models which necessitate relatively few variables has made possible the assessment of lake metabolism on a very fine time scale. One o...
Article
The benthic foodweb structure of Lake Võrtsjärv, a large (270 km2), shallow, and turbid Estonian lake, was evaluated based on C and N stable-isotope signatures (δ13C, δ15N). Variation in δ13C between sampling sites was not related to site proximity to the littoral zone or the more vegetated southern part of the lake, but rather appeared to be influ...
Article
Full-text available
The influence of functional group specific production and respiration patterns on a lake's metabolic balance remains poorly investigated to date compared to whole-system estimates of metabolism. We employed a summed component ecosystem approach for assessing lake-wide and functional group-specific metabolism (gross primary production (GPP) and resp...
Article
The final publication is available at www.springer.com To study the role of large and shallow hemiboreal lakes in carbon processing, we calculated a 3-year carbon mass balance for Lake Võrtsjärv (Estonia) based on in situ measurements. This balance took into account hydrological and biogeochemical processes affecting dissolved inorganic (DIC), dis...
Conference Paper
Full-text available
Whole-lake metabolism has been receiving growing attention recently as lakes are supposed to have large effects on regional carbon balance. However, the contribution of lake functional groups to whole-lake metabolism remains poorly known. In this study we assessed respiration and primary production of different trophic levels of Võrtsjärv, a large,...
Article
The δ15N trophic enrichment in littoral food webs is not well known despite the importance of macroinvertebrates in lacustrine energy fluxes. We wanted to assess the influence of functional feeding group (grazer, collector, shredder, predator, predator–hematophagous, predator–sucker) and spatiotemporal variables (year, month, station of sampling) o...
Article
The main objective of this study was to assess organic matter (OM) and methylmercury (MeHg) sources for freshwater littoral macroinvertebrate primary consumers. The carbon and nitrogen stable isotope ratios (δ13C, δ15N) of sources (epiphytes, macrophytes, suspended particulate matter _SPM) and of macroinvertebrate consumers were measured in a fluvi...
Article
Full-text available
Total mercury and methylmercury concentrations ([THg], [MeHg]) were measured in littoral macroinvertebrates from Lake St. Pierre, Quebec, Canada. Functional groups (detritivore, grazer, edible predator, inedible predator) explained the greatest fraction of [MeHg] variation compared with time (year, month), and space (station and shore). Greatest [T...
Thesis
Full-text available
Article
Full-text available
The influence of macrophyte habitat and architecture on macroinvertebrate biomass, abundance, and richness was investigated in Lake St. Pierre, a large fluvial lake of the St. Lawrence River (Quebec, Canada). A lake-wide estimate of macroinvertebrate biomass associated with different macrophyte habitats was also calculated in order to assess the qu...
Article
Full-text available
Little is known about carbon stable isotope ratios variability in macroinvertebrates despite their importance in littoral productivity as well as fish ontogeny. In this study, we measured the isotopic ratios of macroinvertebrates in Lake St. Pierre, Québec, Canada during the major part of the ice-free period. Functional groups exhibited significant...
Article
Full-text available
First chapter: Total mercury and methylmercury concentrations ([THg], [MeHg]) were measured in littoral macroinvertebrates from Lake St. Pierre, Quebec, Canada. Functional groups (detritivore, grazer, edible predator, inedible predator) explained the greatest fraction of [MeHg] variation compared to time (year, month), and space (station and shore)...
Article
Full-text available
For human populations, the main way of contamination by mercury (Hg) is through the consumption of fish. In Quebec (Canada), annually, there are 1387 tons of freshwater fish caught each year by professional fishermen, more than half of the catches are from Lake St.-Pierre, a widening of the St.-Lawrence River. Despite the fact that this lake receiv...
Article
Full-text available
Dans le cadre de l’étude de cas du fleuve St Laurent du réseau COMERN, l’objectif général de la thèse était de déterminer le rôle des macroinvertébrés littoraux dans le transfert de méthylmercure (MeHg) dans l’écosystème du lac St Pierre. Le premier chapitre était consacré à la contribution quantitative des invertébrés non consommables (« impasses...

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Projects

Projects (4)
Project
Plan is to compose and calibrate models for predicting lacustrine carbon fluxes and metabolism from high-frequency (HF) data on dissolved gases (CO2 and O2) gathered in Estonia and in global scale. Through GLEON and NETLAKE networks we have at our disposal HF chemical and physical data from up to 60 lakes across more than 30 countries. We plan to cover more Estonian lakes with HF monitoring during the project. After calibrating process-based and empirical models with CO2 data from our case study lakes, the models will be run in order to predict carbon pathways in the future according to climate change storylines constructed in USA and France.
Project
MANTEL - Management of Climatic Extreme Events in Lakes & Reservoirs for the Protection of Ecosystem Services, a Marie Skłodowska-Curie Action European Joint Doctorate ITN. The overarching aim of MANTEL is to train a cohort of 12 Early Stage Researchers (ESRs) to investigate the effects of the most extreme events, and more subtle lower magnitude episodic events, on lake and reservoir water quality.
Project
Lakes form 4% and their catchments >50% of land cover in Estonia making it the 4th richest country by lakes in Europe. Lakes receive increasing natural and anthropogenic loads of substances from their catchments. To a certain limit, healthy lake ecosystems bury these substances in their sediments or convert them into bio-production keeping the water clean, and rather bind than emit greenhouse gases. It is important to prevent, but if present, recognize and cure disorders in lake ecosystem functioning. Over its nearly 60-year existence, Centre for Limnology of EMU has become a unique centre of competence in Estonia collecting data and know-how and educating people for water protection, research and management. The basic task of the proposed project is to maintain and develop in Estonia the internationally acknowledged competence on carbon cycling and lake food webs that would sustain knowledge based water policy and compliance with international obligations in global change conditions.