Article
Ecology
Rachel M. M. Pilla, Craig E. E. Williamson
Summary: Long-term browning alters the vertical physical structure of lake ecosystems, leading to increased dissolved organic carbon and reduced water clarity. This affects the habitat suitability and distribution of zooplankton. In Lake Giles, Daphnia populations have decreased in abundance and shifted to shallower vertical distribution. Changes in UV penetration and vertical thermal gradients are the primary drivers of these shifts. The consequences of long-term browning are important for population dynamics, species interactions, and food web structure in lakes.
FRESHWATER BIOLOGY
(2023)
Article
Environmental Sciences
S. J. Nelson, R. A. Hovel, J. Daly, A. Gavin, S. Dykema, W. H. McDowell
Summary: Mountain ponds in the northeastern US have undergone acidification and subsequent recovery due to changes in atmospheric deposition and climate change. This study found widespread declines in sulfate concentrations, increasing ANC, declining conductivity, and increasing DOC in these ponds. Zooplankton communities are sensitive to water chemistry parameters associated with acidification recovery and climate change, highlighting the importance of understanding the combined impacts of atmospheric deposition and climate change on lake ecosystems in eastern mountain ponds.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Oscar E. Senar, Irena F. Creed, Charles G. Trick
Summary: Lake browning, caused by increased input of dissolved organic matter from catchments, leads to changes in lake physicochemical environments, affecting phytoplankton biomass and community composition. The increasing DOM and nutrients in browned lakes shift phytoplankton community from diatoms to cyanobacteria and eventually to mixotrophic species, impacting energy transfer in the lower food web.
Article
Ecology
Shuntaro Koizumi, Mohammed Hamdan, Isolde Callisto Puts, Ann-Kristin Bergstrom, Jan Karlsson, Par Bystrom
Summary: Globally, lakes are experiencing warming and browning due to climate change, which significantly affects their biogeochemical properties and all organisms, including invertebrate consumers. This study used a large-scale experimental pond system to investigate the combined effect of warming and increased input of terrestrial and coloured dissolved organic carbon on zooplankton and benthic macroinvertebrate biomass and composition during autumn and spring. The results suggest that consumer responses to warming and browning during autumn are mostly taxon-specific and may lead to less overall changes in consumer biomass.
FRESHWATER BIOLOGY
(2023)
Article
Biodiversity Conservation
Camille Richon, Alessandro Tagliabue
Summary: Recycling by zooplankton is an important process in the upper ocean, influenced by various factors. The response of micronutrient recycling to climate change is complex, with different drivers playing a role in different regions. Regional changes in recycling rates and stoichiometry under climate change highlight the potential for novel feedbacks in surface ocean biogeochemistry.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Biodiversity Conservation
Elizaveta A. Ershova, Ksenia N. Kosobokova, Neil S. Banas, Ingrid Ellingsen, Barbara Niehoff, Nicole Hildebrandt, Hans-Juergen Hirche
Summary: The study reveals a strong correlation between the abundance and population structure of Calanus glacialis and C. hyperboreus with sea ice parameters. As sea ice retreats and climate conditions change, the core distribution patterns of these key zooplankton species are shifting northwards.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Biology
James A. deMayo, Reid S. Brennan, Melissa H. Pespeni, Michael Finiguerra, Lydia Norton, Gihong Park, Hannes Baumann, Hans G. Dam
Summary: Phenotypic plasticity and evolutionary adaptation can help populations cope with global change, but the limits and costs of adaptation under multiple stressors are not well understood. This study found that a copepod species, Acartia hudsonica, initially experienced a decline in fitness under the combined effects of ocean warming and acidification, but fully recovered within four generations, indicating an adaptive response and synergy between stressors. However, in the long term, the fitness of the adapted lineage was lower compared to the ambient conditions, suggesting a cost to producing phenotypes adapted to both warming and acidification. The study also found sustained phenotypic plasticity in the adapted lineage, even when exposed to different environments.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Article
Environmental Sciences
Yong-Qiang Li, Rui Sun, Chong-Miao Zhang, Zi-Xuan Liu, Rui-tao Chen, Jian Zhao, Hua-dong Gu, Huan-Cai Yin
Summary: In this study, an electron beam excitation multi-wavelength ultraviolet (EBE-MW-UV) system was established and found to have significantly higher microbial inactivation effects compared to single-wavelength UV-LEDs in water. Mechanism analysis revealed that EBE-MW-UV damaged microbial DNA and proteins, and generated additional reactive oxygen species, leading to microbial inactivation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Review
Plant Sciences
Charlotte Permann, Burkhard Becker, Andreas Holzinger
Summary: Zygnematophyceae green algae have developed various mechanisms to adapt to temperature and light stresses on land, such as self-shading, phenolic compounds, and multilayer cell walls.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Environmental Sciences
Yuqiu Wei, Dongsheng Ding, Ting Gu, Tao Jiang, Keming Qu, Jun Sun, Zhengguo Cui
Summary: Based on a systematic analysis of biological and environmental parameters in the Bohai Sea over the past three years, this study suggests that marine plankton communities in coastal ecosystems respond differently to current environmental changes, with an increase in phytoplankton and a decrease in zooplankton. The effect of acidification and warming favors phytoplankton over zooplankton, while water eutrophication, salinity, and heavy metals have diverse consequences on the dynamics of both phytoplankton and zooplankton. Furthermore, interactions between acidification and warming are predicted to lead to a decrease in both phytoplankton and zooplankton in the future.
ENVIRONMENTAL RESEARCH
(2022)
Review
Engineering, Environmental
Terry Callaghan, Roberto Cazzolla Gatti, Gareth Phoenix
Summary: The studies show that although a significant proportion of Arctic vegetation appears stable in the face of rapid warming, research on vegetation greening and browning dominates the literature, with little focus on stability. There is a critical need to understand the mechanisms driving Arctic ecosystem stability and potential longer-term consequences.
Article
Environmental Sciences
Allison J. Clark, Andrew L. Labaj, John P. Smol, Linda M. Campbell, Joshua Kurek
Summary: Gold mining activities in Nova Scotia released contaminants into local environments, impacting sedimentary arsenic and mercury levels in nearby urban lakes. While mercury concentrations at Lake Charles have recovered to pre-mining levels since 1990, arsenic levels remain elevated, indicating incomplete geochemical and biological recovery despite the mine district's closure 80 years ago.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Cong Wang, Enhua Li, Lu Zhang, Huimin Wei, Liang Zhang, Zhi Wang
Summary: In this study, long-term data were used to analyze the succession characteristics and drivers of zooplankton communities in Honghu Lake, China. Results showed significant changes in zooplankton community structure over a period of 62 years, with a decrease in species number and an increase in abundance and biomass. The main driving factors were found to be aquatic environment, land use patterns, and climate factors, with aquatic environment having the highest direct explanation on zooplankton variation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Plant Sciences
Luis Abraham Chaparro-Encinas, Gustavo Santoyo, Juan Jose Pena-Cabriales, Luciano Castro-Espinoza, Fannie Isela Parra-Cota, Sergio de los Santos-Villalobos
Summary: Increasing temperature has a significant impact on durum wheat growth and gene expression, resulting in decreased traits and 283 differentially expressed genes. The enriched GO terms indicate involvement in photosynthetic acclimation, respiration, and lipid biosynthesis, among other physiological processes.
Article
Fisheries
Andrew J. Pershing, Adam Kemberling
Summary: The structure of plankton community changes with seasonal and annual variations in physical conditions. Continuous plankton recorders have provided data on the community changes in the Gulf of Maine since 1961. In the 1990s, a significant shift occurred in the community, possibly due to changes in temperature and salinity. By comparing data from different time periods, researchers have developed a synthesis on how physical changes lead to community shifts.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Limnology
Lina Allesson, Birgit Koehler, Jan-Erik Thrane, Tom Andersen, Dag O. Hessen
Summary: Through studying 70 Scandinavian lakes, this research found that photomineralization contributes relatively little to total CO2 evasion and remains stable across all lakes in relative contribution to in-lake CO2 production. Despite color variations, photomineralization estimates were similar across all lakes regardless of DOC concentrations, while DOC concentrations were positively related to CO2 efflux and in-lake CO2 production.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Plant Sciences
Therese F. Moe, Dag O. Hessen, Benoit O. L. Demars
Summary: Aquatic plant nutrient concentrations can vary greatly, with Juncus bulbosus able to thrive in nutrient-dilute waters due to its high carbon-to-nutrient ratios and slow growth. Stoichiometric ratios of C, N, P, and C:N:P in Juncus bulbosus vary with the time of year, habitats, and organs, but do not differ significantly between growth forms. The mass development of J. bulbosus requires C, N, and P, regardless of the ecosystem, challenging previous studies that suggested only CO2 and NH4 were essential nutrients.
Article
Environmental Sciences
Scott E. Belanger, Adam D. Lillicrap, S. Jannicke Moe, Raoul Wolf, Kristin Connors, Michelle R. Embry
Summary: Acute fish toxicity (AFT) is a crucial endpoint in environmental hazard assessments, but the testing of juvenile fish is resource-intensive. To address this, a Bayesian Network (BN) model has been developed to predict AFT using multiple lines of evidence, including chemical descriptors, mode of action, acute toxicity data, and animal alternative assays. The goal is to have a globally applicable and accepted model that can replace or reduce the use of juvenile fish in environmental hazard assessments.
INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT
(2023)
Article
Marine & Freshwater Biology
Sabrina Schultze, Tom Andersen, Dag O. Hessen, Anders Ruus, Katrine Borga, Amanda E. Poste
Summary: Climate and land-use changes have impacts on individual and interconnected ecosystems. This study examines the dynamics of organic matter (OM) and nutrients in two Norwegian river-to-fjord systems and finds that changes in river inputs can lead to shifts in coastal carbon and nutrient cycling, affecting ecosystem structure and function.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Review
Obstetrics & Gynecology
Hans Ivar Hanevik, Dag O. Hessen
Summary: Humans and all species are shaped by evolution through natural selection. IVF, as a reproductive technology, alters selection pressures and may have long-term impacts on human evolution.
HUMAN REPRODUCTION UPDATE
(2022)
Article
Environmental Sciences
You-Ren Wang, Nina Buchmann, Dag O. Hessen, Frode Stordal, Jan Willem Erisman, Ane Victoria Vollsnes, Tom Andersen, Han Dolman
Summary: By analyzing data from 22 forest sites across Europe, we found that deposition of sulphur and nitrogen has significant impacts on Net Ecosystem Production (NEP) of forests. Sulphur deposition above 5 kg S ha(-1) yr(-1) can significantly reduce NEP, while nitrogen deposition around 22 kg N ha(-1) yr(-1) has the highest positive effect on NEP. Our results emphasize the importance of air quality management for maintaining the biogeochemical functions of forests and mitigating climate change.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Studies
Dag O. Hessen, Vigdis Vandvik
Summary: It is increasingly clear that climate sustainability relies not only on societal actions, but also on the functioning and responses of ecosystems. Climate change and ecosystem degradation are reducing the capacity of global ecosystems to provide services such as carbon sequestration and hydrological regulation. Climate change adaptation and mitigation strategies should focus on conserving and managing ecosystems to minimize climate hazards and risks.
WEATHER CLIMATE AND SOCIETY
(2022)
Article
Environmental Sciences
Thomas R. Anderson, Dag O. Hessen, Wendy C. Gentleman, Andrew Yool, Daniel J. Mayor
Summary: This study investigates the biogeochemical cycling of carbon and nitrogen by high-latitude copepods using a new individual-based stoichiometric model. The results highlight the importance of understanding the physiological utilization of lipids by copepods and suggest that the seasonal lipid pump may be comparable to carbon sequestration via sinking particles in the North Atlantic.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biodiversity Conservation
Isolde Callisto Puts, Jenny Ask, Matthias B. Siewert, Ryan A. Sponseller, Dag O. Hessen, Ann-Kristin Bergstrom
Summary: Global change affects gross primary production in benthic and pelagic habitats of northern lakes by influencing catchment characteristics and lake water biogeochemistry. Changes in key environmental drivers manifest in light limitation of total GPP and the relative size of the benthic habitat. External inputs of inorganic carbon can influence lake productivity patterns independent of terrestrial DOC supply.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Environmental Sciences
You-Ren Wang, Dag O. Hessen, Bjorn H. Samset, Frode Stordal
Summary: Global surface temperature has been setting new record highs, posing increasing challenges for societies and ecosystems worldwide. In this study, two independent datasets, one from remote-sensing and one from surface modeling and observations, are analyzed to estimate land surface temperature change rates. The results show that the global average land surface temperature rate of change was 0.26-0.34°C per decade during the period 2001-2020, with significant regional variations. The Arctic, Europe, and Russia experienced the most significant warming.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Ecology
Bjorn Walseng, Joel M. Durant, Dag O. Hessen, Kurt Jerstad, Anna L. K. Nilsson, Ole W. Rostad, Tore Slagsvold
Summary: Mating strategies in white-throated dippers were investigated based on a comprehensive dataset. The study revealed that a small percentage of breeding events were performed by polygynous males, and the occurrence of polygyny remained stable throughout the study period. Surprisingly, there was no difference in territory quality between polygynous and monogamous males. This study also found that the age and proximity of the females mated to polygynous males differed from those mated to monogamous males.
ECOLOGY AND EVOLUTION
(2022)
Article
Environmental Sciences
Nicolas Valiente, Alexander Eiler, Lina Allesson, Tom Andersen, Francois Clayer, Camille Crapart, Peter Dorsch, Laurent Fontaine, Jan Heuschele, Rolf D. Vogt, Jing Wei, Heleen A. de Wit, Dag O. Hessen
Summary: Boreal lakes, the most abundant lakes on Earth, are experiencing browning due to changes in acid rain deposition, climate, and land use. This browning affects aquatic communities, ecosystem processes, and greenhouse gas emissions. A study conducted in southeastern Norway showed that lake size, precipitation, and terrestrial primary production in the watershed are key determinants of greenhouse gas saturation in boreal lakes. The findings highlight the importance of incorporating multiple explanatory parameters in prediction models for better understanding and extrapolation across the boreal biome.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Multidisciplinary Sciences
Lina Allesson, Nicolas Valiente, Peter Dorsch, Tom Andersen, Alexander Eiler, Dag O. Hessen
Summary: Lakes play a significant role in the global climate, but the environmental drivers of CO2 concentrations along latitudinal and climate gradients are not well understood. This study investigated boreal, sub-Arctic, and high-Arctic lakes in Norway to better understand net heterotrophy and gas balance. The results showed that CO2 saturation levels varied more than O2 saturation levels, and the CO2:O2 ratio was mainly influenced by DOC concentration in boreal lakes and conductivity in sub-Arctic and high-Arctic lakes.
SCIENTIFIC REPORTS
(2022)
Article
Marine & Freshwater Biology
Sabrina Schultze, Tom Andersen, Nina Knudtzon, Anders Ruus, Jan T. Rundberget, Steven J. Brooks, Amanda Poste, Dag O. Hessen, Katrine Borga
Summary: The export of terrestrial dissolved organic matter (terrDOM) to coastal marine ecosystems can affect local filter feeders and the local food web. In this study, blue mussels were exposed to different types of DOM along with teflubenzuron, a commonly used aquaculture medicine. The results showed that the accumulation of teflubenzuron was influenced by the type of DOM, but the differences between DOM types were not considered environmentally relevant.
AQUATIC TOXICOLOGY
(2023)
Article
Medicine, General & Internal
Hans Ivar Hanevik, Dag Olav Hessen
TIDSSKRIFT FOR DEN NORSKE LAEGEFORENING
(2022)
