Annette B.G. Janssen

Annette B.G. Janssen
Wageningen University & Research | WUR · Water Systems and Global Change Group

Doctor of Philosophy

About

49
Publications
25,300
Reads
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1,476
Citations
Introduction
My ambition is contributing to the preservation and recovery of clean water in lakes for its vital value to nature and society. Therefore, I develop lake water quality models to determine critical nutrient loadings for nutrient management. Currently, I work as Postdoc at Wageningen University in the interdisciplinary Chinese project SURE+ where I asses integrated lake management using PCLake within the land, water and food nexus in China.
Additional affiliations
March 2018 - present
Wageningen University & Research
Position
  • PostDoc Position
Description
  • Design of Climate Change Mitigation and Adaptation Strategies (WSG-60812)
October 2017 - present
Wageningen University & Research
Position
  • PostDoc Position
Description
  • I work as Postdoc at Wageningen University in the interdisciplinary Chinese project SURE+ where I asses integrated lake management within the land, water and food nexus in China.
October 2016 - October 2017
Netherlands Institute of Ecology (NIOO-KNAW)
Position
  • PostDoc Position
Description
  • Development of PCLake+, a freshwater lake model for shallow and deep lakes

Publications

Publications (49)
Article
Full-text available
Here, we present a community perspective on how to explore, exploit and evolve the diversity in aquatic ecosystem models. These models play an important role in understanding the functioning of aquatic ecosystems, filling in observation gaps and developing effective strategies for water quality management. In this spirit, numerous models have been...
Article
Water quality improvement to avoid excessive phytoplankton blooms often requires eutrophication management where both phosphorus (P) and nitrogen (N) play a role. While empirical eutrophication studies and ecological resource competition theory both provide insight into phytoplankton abundance in response to nutrient loading, they are not seamlessl...
Article
Full-text available
Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to plan for the likely impacts. Previous studies of the impacts of climate change on lakes have often relied on a...
Article
Full-text available
Meeting the United Nations’ (UN’s) 17 Sustainable Development Goals (SDGs) has become a worldwide mission. How these SDGs interrelate, however, is not well known. We assess the interactions between SDGs for the case of water pollution by nutrients in China. The results show 319 interactions between SDGs for clean water (SDGs 6 and 14) and other SDG...
Preprint
Full-text available
Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure and resulting changes in lake biogeochemistry in order to plan for the likely impacts. Previous studies of the impacts of climate change on lakes have often relied on a...
Article
Full-text available
Lake ecosystems are jeopardized by the impacts of climate change on ice seasonality and water temperatures. Yet historical simulations have not been used to formally attribute changes in lake ice and temperature to anthropogenic drivers. In addition, future projections of these properties are limited to individual lakes or global simulations from s...
Article
Ecological thresholds are useful indicators for water quality managers to define limits to nutrient pollution. A common approach to estimating ecological thresholds is using critical nutrient loads. Critical nutrient loads are typically defined as the loads at whichthe phytoplankton chlorophyll-a exceeds a certain concentration. However, national p...
Article
Full-text available
Chinese lakes, including ponds and reservoirs, are increasingly threatened by algal blooms. Yet, each lake is unique, leading to large inter-lake variation in lake vulnerability to algal blooms. Here, we aim to assess the effects of unique lake characteristics on lake vulnerability to algal blooms. To this end, we built a novel and comprehensive da...
Article
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p>Nutrients are essential resources for food production but are used inefficiently, and thereby they pollute inland and coastal waters and are lost into the oceans. Nutrient conservation by retention and consecutive reuse would prevent nutrient losses to the atmosphere and downstream ecosystems. We present Smart Nutrient Retention Networks (SNRNs)...
Article
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p>Crop and livestock production are essential to maintain food security. In China, crop and livestock production were integrated in the past. Today, small backyard systems are still integrated but the larger livestock farms are landless and largely geographically separated from crop production systems. As a result, there is less recycling of animal...
Article
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Globally, many shallow lakes have shifted from a clear macrophyte-dominated state to a turbid phytoplankton-dominated state due to eutrophication. Such shifts are often accompanied by toxic cyanobacterial blooms, with specialized traits including buoyancy regulation and nitrogen fixation. Previous work has focused on how these traits contribute to...
Article
Full-text available
• Shallow lakes can shift between stable states as a result of anthropogenic or natural drivers. Four common stable states differ in dominant groups of primary producers: submerged, floating, or emergent macrophytes or phytoplankton. Shifts in primary producer dominance affect key supporting, provisioning, regulating, and cultural ecosystem service...
Article
Full-text available
Heat uptake is a key variable for understanding the Earth system response to greenhouse gas forcing. Despite the importance of this heat budget, heat uptake by inland waters has so far not been quantified. Here we use a unique combination of global‐scale lake models, global hydrological models and Earth system models to quantify global heat uptake...
Article
Significance Due to different rates of change in total nitrogen (TN) and total phosphorus (TP) concentrations in lakes, increases in TN/TP mass ratios were observed in many China’s freshwater lakes during 2008 to 2017. This growing imbalance has important implications for aquatic ecology that remain poorly considered and understood. Here, we show t...
Article
Full-text available
Food production for a growing world population relies on application of fertilisers and pesticides on agricultural lands. However, these substances threaten surface water quality and thereby endanger valued ecosystem services such as drinking water supply, food production and recreational water use. Such deleterious effects do not merely arise on t...
Article
Addressing challenges of water, energy and food security, nexus approaches towards resources management are being developed and starting to be implemented. However, the ecosystem perspective, essential for sustainable resources management, has been identified as a missing element within earlier nexus assessments. With regard to water they have main...
Article
Full-text available
Worldwide, eutrophication is threatening lake ecosystems. To support lake management numerous eutrophication models have been developed. Diverse research questions in a wide range of lake ecosystems are addressed by these models. The established models are based on three key approaches: the empirical approach that employs field surveys, the theoret...
Article
Full-text available
Many aquatic ecosystems have deteriorated due to human activities and their restoration is often troublesome. It is proposed here that the restoration success of deteriorated lakes critically depends on hitherto largely neglected spatial heterogeneity in nutrient loading and hydrology. A modelling approach is used to study this hypothesis by consid...
Article
Induced bank filtration (IBF) is a water abstraction technology using different natural infiltration systems for groundwater recharge, such as river banks and lake shores. It is a cost-effective pre-treatment method for drinking water production used in many regions worldwide, predominantly in urban areas. Until now, research concerning IBF has alm...
Article
Full-text available
Algal blooms increasingly threaten lake and reservoir water quality at the global scale, caused by ongoing climate change and nutrient loading. To anticipate these algal blooms, models to project future algal blooms worldwide are required. Here we present the state-of-the-art in algal projection modelling and explore the requirements of an ideal al...
Article
Full-text available
The lake ecosystem model PCLake is a process-based model that was developed to simulate water quality based on ecological interactions in shallow, non-stratifying lakes in the temperate climate zone. Here we present PCLake+, which extends the PCLake model to cover a wide range of freshwater lakes that differ in stratification regime and climate-rel...
Article
Lake Dianchi suffered from severe eutrophication for decades. Past efforts to reduce the eutrophication were not very effective. The objective of this study is to improve our understanding of nitrogen (N) and phosphorus (P) loadings and to analyze to what extent they exceed critical nutrient loadings of Lake Dianchi. To this end, we applied the nut...
Article
Full-text available
“Everything changes and nothing stands still” (Heraclitus). Here we review three major improvements to freshwater aquatic ecosystem models — and ecological models in general — as water quality scenario analysis tools towards a sustainable future. To tackle the rapid and deeply connected dynamics characteristic of the Anthropocene, we argue for the...
Article
Water bodies in the urban landscape are omnipresent, with many being small, lentic waters such as ponds and lakes. Because of high anthropogenic forcing, these systems have poor water quality, with large consequences for the provisioning of ecosystem services. Understanding of the main pressures on urban water quality is key to successful managemen...
Article
Wetlands play an important role in the provision of important ecosystem services like the provision of clean water to the world, adaptation to climate change, and support for biodiversity; although they are sometimes also associated with adverse climate effects. Wetlands are, however, currently grossly underrepresented in global environmental model...
Article
Full-text available
Intensive agriculture and rapid urbanization have increased nutrient inputs to Lake Taihu in recent decades. This resulted in eutrophication. We aim to better understand the sources of river export of total dissolved nitrogen (TDN) and phosphorus (TDP) to Lake Taihu in relation to critical nutrient loads. We implemented the MARINA-Lake (Model to As...
Article
Full-text available
Submerged macrophytes play a key role in north temperate shallow lakes by stabilizing clear-water conditions. Eutrophication has resulted in macrophyte loss and shifts to turbid conditions in many lakes. Considerable efforts have been devoted to shallow lake restoration in many countries, but long-term success depends on a stable recovery of submer...
Article
Full-text available
Nature Ecology & Evolution - online Abstract There is a pressing need to apply stability and resilience theory to environmental management to restore degraded ecosystems effectively and to mitigate the effects of impending environmental change. Lakes represent excellent model case studies in this respect and have been used widely to demonstrate th...
Article
Full-text available
All over the world freshwater ecosystems like ponds, ditches and lakes suffer from nutrient-driven regime shifts from submerged plants to dominance by algae or free-floating plants. Although freshwaters are often connected and part of a network, most of our current knowledge on regime shifts comes from studies of isolated ecosystems. The few studie...
Article
Full-text available
Submerged macrophytes play an important role in maintaining good water quality in shallow lakes. Yet extensive stands easily interfere with various services provided by these lakes, and harvesting is increasingly applied as a management measure. Because shallow lakes may possess alternative stable states over a wide range of environmental condition...
Article
Full-text available
Ongoing eutrophication frequently causes toxic phytoplankton blooms. This induces huge worldwide challenges for drinking water quality, food security and public health. Of crucial importance in avoiding and reducing blooms is to determine the maximum nutrient load ecosystems can absorb, while remaining in a good ecological state. These so called cr...
Article
Full-text available
Ecosystems can show sudden and persistent changes in state despite only incremental changes in drivers. Such critical transitions are difficult to predict as the state of the system often shows little change prior to the transition. Early-warning indicators are hypothesised to signal the loss of system resilience and have been shown to precede crit...
Preprint
Full-text available
Ecosystem models aiming to describe higher level variables such as total phosphorus and water transparency will always remain a crude simplification of reality regardless of the detail that is included. This weak link between model and reality implies that it will be impossible to accurately parameterize each of the model components on basis of emp...
Article
Full-text available
This study presents FABM-PCLake, a redesigned structure of the PCLake aquatic ecosystem model, which we implemented in the Framework for Aquatic Biogeochemical Models (FABM). In contrast to the original model, which was designed for temperate, fully mixed freshwater lakes, the new FABM-PCLake represents an integrated aquatic ecosystem model that ca...
Article
Full-text available
Spears, B.M., Carvalho, L., Futter, M.N., May, L., Thackeray, S.J., Adrian, R., Angeler, D.G., Burthe, S.J., Davidson, T.A., Daunt, F., Gsell, A.S., Hessen, D.O., Moorhouse, H., Huser, B., Ives, S.C., Janssen, A.B.G., Mackay, E.B., Søndergaard, M., Jeppesen, E. Ecological instability in lakes: a predictable condition? Environmental Science & Techno...
Article
Full-text available
This study presents FABM-PCLake, a complete redesign of the PCLake aquatic ecosystem model, which we implemented into the Framework for Aquatic Biogeochemical Models (FABM). In contrast to the original model, which was designed for temperate, fully mixed freshwater lakes, the new FABM-PCLake represents an integrated aquatic ecosystem model that ena...
Conference Paper
Full-text available
"Integrated Lake Modelling in the Climate System" and "Lake Ice Dynamics" were two sessions at the ASLO Aquatic Sciences Meeting in Granada Feb. 2015 attracting each 12 presentations on * modelling hydrodynamic processes in lakes, * coupling with ecosystem models, * running multi-lake and multi-model approaches, and * coupling with regional climat...
Article
Full-text available
Water quality modelling deals with multidisciplinary questions ranging from fundamental to applied. Addressing this broad range of questions requires multiple analysis techniques and therefore multiple frameworks. Through the recently developed database approach to modelling (DATM), it has become possible to run a model in multiple software framewo...
Article
Full-text available
Many lakes worldwide are experiencing great change due to eutrophication. Consequently, species composition changes, toxic algal blooms proliferate, and drinking water supplies dwindle. The transition to the deteriorated state can be catastrophic with an abrupt change from macrophyte to phytoplankton domination. This has been shown repeatedly in sm...
Article
Full-text available
2014. Coupled human and natural system dynamics as key to the sustainability of Lake Victoria's ecosystem services. Ecology and Society 19(4):
Article
Full-text available
Simulation modelling in ecology is a field that is becoming increasingly compartmentalized. Here we propose a Database Approach To Modelling (DATM) to create unity in dynamical ecosystem modelling with differential equations. In this approach the storage of ecological knowledge is independent of the language and platform in which the model will be...

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Projects

Projects (5)
Project
Algal blooms turn lakes into toxic soups. Why are we unable to prevent them? This research studies the interaction between society and environment to find new solutions to prevent algal blooms. These solutions will help us to restore our lakes back to a healthy environment.
Project
Simulations of climate-change effects on lakes using coupled lake-hydrodynamic and water-quality models.
Archived project
To develop PCLake+, a model for freshwater lakes that can be applied to both shallow and deep lakes.