Gert Everaert

Gert Everaert
Vlaams Instituut Voor De Zee | VLIZ · Department Research

PhD

About

82
Publications
30,148
Reads
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1,538
Citations
Citations since 2017
49 Research Items
1348 Citations
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20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
Additional affiliations
June 2017 - present
Vlaams Instituut Voor De Zee
Position
  • Data Science Manager
May 2015 - May 2017
Ghent University
Position
  • PhD Student
August 2009 - April 2015
Ghent University
Position
  • PhD Student

Publications

Publications (82)
Poster
Full-text available
Microplastics are a persistent and ubiquitous environmental contaminant in global marine and surface waters. Microplastics can harm wildlife who ingest them by inhibiting food assimilation and translocating into tissue. Differences in monitoring techniques as well as particle types used for toxicity experiments make direct comparisons of lab and fi...
Article
Outdoor environments benefit health by providing psychological restoration, but the degree of psychological restoration may vary considerably within heterogenous areas. This study focused on the Belgian coast to quantify the inter- and intra-environment variation in psychological restoration and the influence of natural and urban components and peo...
Article
Full-text available
Micro- and nanoplastics (MNPs) pollution is an environmental issue of concern, but current effect assessments often overlook realistic scenarios, and a contextualised vision of the magnitude of the impact of complex mixtures of MNPs together with other environmental stressors is urgently needed. Plastic particles exist in the environment as complex...
Article
Full-text available
Coastal environments are increasingly shown to have a positive effect on our health and well-being. Various mechanisms have been suggested to explain this effect. However, so far little focus has been devoted to emotions that might be relevant in this context, especially for people who are directly or indirectly exposed to the coast on a daily basi...
Preprint
Full-text available
This work presents a hyperspectral reflectance dataset of macroplastic samples acquired using Analytical Spectral Devices (ASD) FieldSpec 4. Samples analysed consisted of pristine, artificially weathered and biofouled plastic items and plastic debris samples collected in the docks of the Port of Antwerp and in the river Scheldt near Temse Bridge (B...
Article
Full-text available
When applying the Ecosystem Services (ES) concept for the management of marine activities it is beneficial to involve stakeholders from the start and incorporate their knowledge in the decision-making process. Doing so can help to identify key ES, to prioritize the development of human activities that positively impact those ES, and to identify pot...
Article
Microplastics (MPs) were collected at six locations along Kenya's marine nearshore surface waters using a 300 μm mesh-size manta net. The samples were washed over a 125-μm mesh size sieve No.120 into a glass jar and preserved in 70% ethanol. MPs were sorted, counted visually under a dissecting microscope then identified using attenuated total refle...
Article
The goal of this study was to determine whether a bio-based self-reinforced polylactic acid (SRPLA) is suitable for use in structures deployed in the marine environment. The material was produced from co-mingled fibres with different melting points. Two key criteria, durability during service and microplastic formation, were examined. To assess dur...
Article
Full-text available
Microplastic is ubiquitously and persistently present in the marine environment, but knowledge of its population‐level effects is limited. In this study, to quantify the potential theoretical population effect of microplastic a two‐step approach was followed. First, the impact of microplastic (polyethylene, 0.995 g cm‐3, diameter 10‐45 µm) on the f...
Article
Full-text available
Microplastic pollution is an issue of concern due to the accumulation rates in the marine environment combined with the limited knowledge about their abundance, distribution and associated environmental impacts. However, surveying and monitoring microplastics in the environment can be time consuming and costly. The development of cost-and time-effe...
Preprint
Full-text available
10 Marine phytoplankton biomass dynamics are affected by eutrophication, ocean warming, and ocean acidification. These changing abiotic conditions may impact phytoplankton biomass and its spatiotemporal dynamics. In this study, we used a nutrient-phytoplankton-zooplankton model to quantify the relative importance of bottom-up and top-down determina...
Article
Full-text available
Monitoring the occurrence and trends of microplastic contamination in the marine environment is key to establish microplastic (MP) data baselines, to work out policy mitigation measures, and to assess the effectiveness of waste regulations. To establish MP contamination baselines in the marine environment, marine biota species can be selected as mo...
Article
Increased pressures from human activities may cause cumulative ecological effects on marine ecosystems. Increasingly, the study of ecosystem services is applied in the marine environment to assess the full effects of human activities on the ecosystem and on the benefits it provides. However, in the marine environment, such integrated studies have y...
Article
Nowadays, a variety of methodologies are available to assess local, regional and global impacts of human activities on ecosystems, which include Life Cycle Assessment (LCA), Environmental Risk Assessment (ERA) and Ecosystem Services Assessment (ESA). However, none can individually assess both the positive and negative impacts of human activities at...
Article
Full-text available
Current mitigation strategies to offset marine plastic pollution, a global concern, typically rely on preventing floating debris from reaching coastal ecosystems. Specifically, clean-up technologies are designed to collect plastics by removing debris from the aquatic environment such as rivers and estuaries. However, to date, there is little publis...
Experiment Findings
Study experimentally the behavior of plastic litter in the water column by determining their vertical flux as a function of polymer type, shape, size, degree of biofouling, and lab-based and natural weathering.
Experiment Findings
Perform field observations on the horizontal and vertical distribution of plastic litter in the water column and their presence in the sediments. A simultaneous integrated sampling campaign will be organized to sample both micro- and macroplastic in different environmental compartments
Experiment Findings
Study experimentally the behavior of plastic litter in the water column by determining their vertical flux as a function of polymer type, shape, size, degree of biofouling, and lab-based and natural weathering.
Experiment Findings
Get a model-based quantification of plastic flux from inland waters towards the coastal region. We will get insight into where the plastic travels, where it washes ashore and where it is deposited in the sediment, as well as how this relates to the physical-chemical characteristics of the plastic litter
Experiment Findings
Assess experimentally to which extent plastics near the water surface can be detected and quantified based on remotely sensed data. The suitability of different image classification methods, as spectral feature analyses combined with innovative machine learning techniques, will be assessed. Various experiments, performed under controlled lab and me...
Article
Full-text available
There is a growing interest in replacing fossil-based polymers and composites with more sustainable and renewable fully biobased composite materials in automotive, aerospace and marine applications. There is an effort to develop components with a reduced carbon footprint and environmental impact, and materials based on biocomposites could provide s...
Article
Full-text available
There is increasing evidence that blue spaces, particularly coastal environments, are beneficial for well-being. During the first-wave lockdown of the COVID-19 pandemic in Belgium, access to the coast was restricted due to restraint in circulation. Making use of this unique opportunity, this study investigated whether access and visits to the coast...
Article
Full-text available
Worldwide river systems are under pressure from human development. River managers need to identify the most important stressors in a stream basin, to propose effective management interventions for river restoration. In the European Union, the Water Framework Directive proposes the ecological status as the management endpoint for these interventions...
Technical Report
Full-text available
In this technical report, we describe the data needed, the preprocessing steps taken and the next steps ahead in order to develop a fully calibrated ecosystem model for the southern part of the North Sea.
Article
Microplastic pollution has sparked interest from researchers, public, industries and regulators, due to reports of extensive microplastics presence in the environment, household dust, drinking water, and food that indicate chronic exposure to organisms within ecosystems and in human living spaces. While exposure to microplastics is evident, negativ...
Preprint
Full-text available
An important element to keep track of global change is the atmosphere–water exchange of carbon dioxide (CO2) in the ocean as it provides insight in how much CO2 is incorporated in the ocean (i.e. the ocean as a sink for CO2) or emitted to the atmosphere (i.e. the ocean as a source). To date, only few high-resolution observation sets are available t...
Article
Full-text available
The current knowledge about the ecological effects of microplastic (MP) remains limited, and to-date ecotoxicity tests often utilize standard microplastic with one or two distinct size classes and expose the organisms to un-realistically high MP concentrations. We exposed the marine diatom Phaeodactylum tricornutum to microplastic particles of a mi...
Article
Full-text available
Despite the ubiquitous and persistent presence of microplastic (MP) in marine ecosystems, knowledge of its potential harmful ecological effects is low. In this work, we assessed the risk of floating MP (1 μm – 5 mm) to marine ecosystems by comparing ambient concentrations in the global ocean with available ecotoxicity data. The integration of twent...
Article
Full-text available
Local biodiversity trends over time are likely to be decoupled from global trends, as local processes may compensate or counteract global change. We analyze 161 long-term biological time series (15–91 years) collected across Europe, using a comprehensive dataset comprising ~6,200 marine, freshwater and terrestrial taxa. We test whether (i) local lo...
Poster
This poster discussed the findings published in Hooyberg et al 2020 (Environmental Research)
Article
Full-text available
Keywords: Habitat suitability Mechanistic niche modelling Northward range shift Physiological thresholds Seaweed aquaculture A B S T R A C T The European seaweed cultivation sector is in a transition phase with the rise of seaweed aquaculture due to an increased interest in seaweed resources. Identifying regions with optimal growth conditions for t...
Presentation
This presentation was about the results published in Hooyberg et al 2020 (Environmental Research).
Article
Full-text available
The Belgian part of the North Sea (BPNS) is subjected to multiple environmental stressors. The impact of these stressors includes the modulation of fatty acid (FA) composition of the zooplankton. This study recorded temporal and spatial patterns of the FA profiles of two dominant calanoid copepods within the BPNS: Temora longicornis (Müller, 1785)...
Article
Full-text available
The Guayas River basin is one of the most important water resources in Ecuador, but the expansion of human activities has led to a degraded water quality. The purpose of this study was (1) to explore the importance of physical-chemical variables in structuring the macroinvertebrate communities and (2) to determine if the thresholds in stream veloci...
Article
Extensive anthropogenic activities including land conversion have been taking place in the Guayas river basin (Ecuador) due to increasing population growth. Land use changes are considered one of the key sources affecting the ecological water quality of the Guayas river basin. Therefore, we investigated the effect of land use on the ecological wate...
Article
Full-text available
We performed an environmental risk assessment for microplastics (< 5 mm) in the marine environment by estimating the order of magnitude of the past, present and future concentrations based on global plastic production data. In 2100, from 9.6 to 48.8 particles m-3 are predicted to float around in the ocean, which is a 50-fold increase compared to th...
Article
Ecological risk assessment (ERA) is commonly based on single generation ecotoxicological tests that are usually performed at one standard temperature. We investigate the effects of nickel (Ni) on Daphnia magna reproduction at 15, 20 and 25°C along four generations. Multigenerational Ni effects on D. magna reproduction depended on the magnitude of t...
Article
Full-text available
We critically analyzed a set of ecological models that are used to assess the impact of hydropower dams on water quality and habitat suitability for biological communities. After a literature search, we developed an integrated conceptual model that illustrates the linkages between the main input variables, model approaches, the output variables and...
Article
Full-text available
Land-use changes influence the ecological water quality. In spite of this knowledge, land-use information is often missing in ecological water quality studies. Therefore, in the present research, we selected 39 peer-reviewed model-based scientific papers that study the relationship between land use and aquatic macroinvertebrates. From the selected...
Article
Full-text available
The effect of multiple stressors on marine ecosystems remains poorly understood and most of the knowledge available is related to phytoplankton. To partly address this knowledge gap, we tested if combining multimodel inference with generalized additive modelling could quantify the relative contribution of environmental variables on the population d...
Article
Full-text available
We characterized spatial patterns of surface sediment concentrations of seven polychlorinated biphenyls (PCBs), seven polycyclic aromatic hydrocarbons (PAHs), three chlorinated pesticides and five metals in Norwegian waters and Skagerrak. In total, we analysed 5,036 concentrations of 22 chemical substances that were measured between 1986 and 2014 a...
Article
Full-text available
The effect of multiple stressors on marine ecosystems is poorly understood. To partially bridge this knowledge gap we investigated the relative contribution of environmental variables to density and diversity dynamics of the zooplankton community in the Belgian part of the North Sea. We applied multimodel inference on generalized additive models to...
Article
Full-text available
Rivers have been frequently assessed based on the presence of the Ephemeroptera— Plecoptera—Trichoptera (EPT) taxa in order to determine the water quality status and develop conservation programs. This research evaluates the abiotic preferences of three families of the EPT taxa Baetidae, Leptoceridae and Perlidae in the Machangara River Basin locat...
Article
Full-text available
The Portoviejo River, located in the central western part of Ecuador, has been heavily impacted by damming, intensive agriculture and untreated wastewater discharge. Unfortunately, detailed information on the water quality and the ecological status of the Portoviejo River is not available, inhibiting decision-making and the development of water man...
Article
Full-text available
In the present research, we found that different preprocessing options and parameterizations of classification and regression trees alter their model fit and have a direct effect on their applicability for end-users. We found that, in terms of applicability, classification trees react different to pruning than regression trees. Indeed, in case of h...
Article
Full-text available
The biotic integrity of the Guayas River basin in Ecuador is at environmental risk due to extensive anthropogenic activities. We investigated the potential impacts of hydromorphological and chemical variables on biotic integrity using macroinvertebrate-based bioassessments. The bioassessment methods utilized included the Biological Monitoring Worki...
Article
The Guayas river basin is one of the major watersheds in Ecuador, where increasing human activities are affecting water quality and related ecosystem services. The aims of this study were (1) to assess the ecological water quality based on macroinvertebrate indices and (2) to determine the major environmental variables affecting these macroinverteb...
Article
Data-driven environmental models are mainly assessed on the basis of their model fit and only limited attention is given to their applicability for end-users. In this paper, we present the applicability index (API) that scores decision trees in terms of their interpretability and applicability for end-users. The API integrates two criteria, viz. th...
Chapter
Reactions to ongoing loss of biodiversity include a variety of restoration actions and are characterised by high costs and uncertainty. Related decision-making can be supported by developing species distribution models (SDMs) that link predictors (both abiotic and biotic) with biotic response variables (e.g., abundance, occurrence, etc.). SDMs can...
Article
We analysed three decades of field observations in the North Sea with additive models to infer spatiotemporal trends of chlorophyll a concentrations, sediment organic carbon content and of polychlorinated biphenyls (PCBs) concentrations in mussels and in sediments. By doing so, we separated long-term changes in PCB concentrations from seasonal vari...
Thesis
A complex chemical cocktail, with unknown composition and concentrations, is present in marine waters. Although the awareness of the vulnerability of marine ecosystems to pollution-induced changes increased, the ecotoxicological effects of chemical pollutants on marine ecosystems are poorly understood. Even in intensively monitored regions such as...
Article
The Vietnamese fisheries have developed rapidly in last decades and have significantly contributed to socio-economic development. However, it is questionable how sustainable development can be achieved due to lack of effective fisheries management. To obtain more insights in the impact and sustainability of marine fisheries, the development and imp...
Article
Full-text available
Blackflies are important macroinvertebrate groups from a public health as well as ecological point of view. Determining the biological and environmental factors favouring or inhibiting the existence of blackflies could facilitate biomonitoring of rivers as well as control of disease vectors. The combined use of different predictive modelling techni...
Article
Full-text available
Blackflies are important macroinvertebrate groups from a public health as well as ecological point of view. Determining the biological and environmental factors favouring or inhibiting the existence of blackflies could facilitate biomonitoring of rivers as well as control of disease vectors. The combined use of different predictive modelling techni...
Article
Full-text available
We assessed and compared abiotic preferences of aquatic macroinvertebrates in three river basins located in Ecuador, Ethiopia and Vietnam. Upon using logistic regression models we analyzed the relationship between the probability of occurrence of five macroinvertebrate families, ranging from pollution tolerant to pollution sensitive (Chironomidae,...
Article
Full-text available
Worldwide large investments in wastewater treatment are made to improve water quality. However, the impacts of these investments on river water quality are often not quantified. To assess water quality, the European Water Framework Directive (WFD) requests to use an integrated approach. The aim of this study was to develop an integrated ecological...
Article
We developed generalised additive mixed models (GAMMs) to infer spatiotemporal trends of environmental PCB concentrations from an extensive dataset (n=1219) of PCB concentrations measured between 1991 and 2010 in sediments of the Belgian Coastal Zone (BCZ) and the Western Scheldt estuary. A GAMM with time, geographical zone, periodicity and the org...