Article
Multidisciplinary Sciences
Irina Zhulay, Katrin Iken, Paul E. Renaud, Ksenia Kosobokova, Bodil A. Bluhm
Summary: Pelagic-benthic coupling refers to the connection between surface-water production and seafloor habitats through the exchange of energy, nutrients, and mass. The strength of this coupling was compared between 2005 and 2016 in the poorly studied Arctic Chukchi Borderland, with 2016 being a low-ice year. The results showed weaker coupling in 2016, with higher isotopic niche overlap and shorter isotopic distance between pelagic and benthic food web components.
SCIENTIFIC REPORTS
(2023)
Article
Environmental Sciences
Benjamin D. Barst, John Chetelat, Niladri Basu
Summary: We assessed the risks of mercury exposure for Arctic fish and invertebrates. Most Arctic fish are not at risk for mercury toxicity, but a smaller number of fish may face moderate, high, or severe risks. Mercury concentrations in Arctic invertebrates are generally low and below levels associated with acute and sublethal effects. Further research is needed to directly evaluate the effects of mercury exposure in Arctic fish species.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Anabel von Jackowski, Maren Walter, Timo Spiegel, Pier Luigi Buttigieg, Massimiliano Molari
Summary: This study investigated the microbial communities in the water column and sediments of the ice-covered Arctic ridge system called the Langseth Ridge. The findings suggest that sponges on the seafloor play a significant role in pelagic-benthic coupling and act as ecosystem engineers.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Biodiversity Conservation
Huan Zhang, Peiyu Zhang, Huan Wang, Jorge Garcia Molinos, Lars-Anders Hansson, Liang He, Min Zhang, Jun Xu
Summary: The experiment showed that phosphorus addition weakened top-down effects of cyclopoid copepod predators on rotifer prey, while warming strengthened these effects, leading to a reduction in rotifer abundance. Warming increased susceptibility of plankton prey to predator effects but reduced sensitivity to nutrient enrichment. This suggests that cyclopoid copepods are likely to benefit more from nutrient enrichment and climate warming at the expense of rotifer prey.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Multidisciplinary Sciences
Remi Amiraux, David J. Yurkowski, Philippe Archambault, Marie Pierrejean, C. J. Mundy
Summary: The traditional view that the benthic compartment is simpler in structure compared to the pelagic compartment is challenged in this study, which illustrates the presence of a subweb in the benthic realm with similar complexity to the pelagic counterpart, including megafaunal-predatory sea stars equivalent to iconic polar bears.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Isabel R. Hilgendag, Heidi K. Swanson, Christopher W. Lewis, Ashley D. Ehrman, Michael Power
Summary: This study investigated mercury biomagnification in benthic, pelagic, and benthopelagic marine food webs in the Arctic, with results showing the highest biomagnification values in the benthopelagic food web. The benthic food web exhibited the greatest trophic diversity and isotopic niche area. Further study is needed to understand the impact of food web complexity on mercury biomagnification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jana C. Massing, Anna Schukat, Holger Auel, Dominik Auch, Leila Kittu, Elda Luz Pinedo Arteaga, Jonathan Correa Acosta, Wilhelm Hagen
Summary: The northern Humboldt Current upwelling system is one of the most productive marine ecosystems, with fisheries landings five to eight times higher than other coastal upwelling systems. A study was conducted to understand the pelagic food-web structure and trophic interactions in this system. The study found regional shifts in the food web and differences in δN-15 ratios between surface waters and the oxygen minimum zone. Additionally, the role of benthic-pelagic coupling and the importance of certain key species in the zooplankton community were identified.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Limnology
Kim Vane, Matthew R. D. Cobain, Clive N. Trueman, Tobias R. Vonnahme, Sebastian Rokitta, Nicholas V. C. Polunin, Hauke Flores
Summary: A warming Arctic Ocean and declining sea-ice have led to changes in sea-ice protist communities, impacting under-ice, pelagic, and benthic fauna. The lack of suitable biomarkers makes it difficult to quantify these effects on food webs. This study explores the potential use of δC-13 values of essential amino acids (EAAs) to estimate the proportional use of basal resources by organisms in different habitats. The results suggest that δC-13(EAA) fingerprints combined with microalgae baseline δC-13(EAA) values provide valuable insights into the effects of Arctic basal resource changes on organism utilization.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Oceanography
Hyuntae Choi, Haemin Won, Jee-Hoon Kim, Eun Jin Yang, Kyoung-Ho Cho, Youngju Lee, Sung-Ho Kang, Kyung-Hoon Shin
Summary: The trophic level and dominant diet of the Arctic copepod Calanus hyperboreus differ between the northern Chukchi Sea and the northern-East Siberian Sea due to variations in chlorophyll abundance and sea ice concentration. Differences in the proportion of diatoms consumed by C. hyperboreus in these regions may be attributed to phytoplankton composition changes caused by surface seawater stratification and inflow of sea ice meltwater as well as Bering Sea water through the Bering Strait. These results suggest that C. hyperboreus could be a valuable indicator for understanding trophic dynamics in the zooplankton food web.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Zhigang Mao, Xiaohong Gu, Yong Cao, Juhua Luo, Qingfei Zeng, Huihui Chen, Erik Jeppesen
Summary: The transition from macrophyte to phytoplankton dominance in lake ecosystems can alter ecosystem structure and change the basic resources supporting the food web. Benthic invertebrates play a crucial role in this transition by transporting pelagic algae to the benthic zone, compensating for the reduction of macrophytes and epiphytes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
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
Nadezhda A. Berezina, Alexei V. Tiunov, Vasily A. Petukhov, Yulia I. Gubelit
Summary: This study investigated the ecological conditions and trophic links in the Neva estuary during the Cladophora bloom. Researchers found that the abundance of grazing and omnivorous invertebrates was high in the Cladophora-dominated coastal community. Additionally, the study revealed that Cladophora contributed significantly to the coastal food web, supporting the production of benthic consumers.
Article
Ecology
Philippe S. Munyandamutsa, Wilson L. Jere, Daud Kassam, Austin Mtethiwa
Summary: Local adaptation to the littoral and pelagic zones in two cichlid haplochromine fish species from Lake Kivu was investigated using morphometrics. Cranial variation, inferred jaw mechanics, kinematic transmission of the anterior jaw four-bar linkage, and inferred bite force were all found to exhibit habitat-specific differences. Additionally, sex-specific differences in craniofacial morphology were observed, with males showing longer heads than females in both habitats. Further studies on other Lake Kivu fish species are recommended to explore the observed trophic patterns and their genetic basis of divergences.
ECOLOGY AND EVOLUTION
(2021)
Article
Biology
Vladimir G. Dvoretsky, Marina P. Venger, Anastasya V. Vashchenko, Tatyana M. Maksimovskaya, Tatyana G. Ishkulova, Veronika V. Vodopianova
Summary: Microbial plankton, including bacteria and viruses, play a crucial role in aquatic ecosystems. This study investigated the abundance of marine bacteria and viruses in the northeastern Barents Sea, after the main productive season. The results showed a mosaic horizontal distribution of microbial plankton, with decreasing numbers of bacteria and viruses with depth. Nutrients and zooplankton carbon were found to be important drivers of microbial abundance. Bacterioplankton abundance was positively correlated with virus counts, indicating a close relationship between these groups. The study provides baseline information and expands our current knowledge on the structure of pelagic Arctic ecosystems.
Article
Engineering, Environmental
Cheng Dong, Qinghua Zhang, Siyuan Xiong, Ruiqiang Yang, Zhiguo Pei, Yingming Li, Guibin Jiang
Summary: This study analyzed the occurrence and trophic transfer of PCNs in polar ecosystems. It found that PCN concentrations in biota and marine sediments were relatively low and stable in both the Arctic and Antarctic regions. However, there were differences in trophic transfer patterns between the two regions, leading to different environmental risks.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Editorial Material
Environmental Sciences
Geoff Koehler, Robert B. Brua, Eva C. Enders
Summary: Lake Winnipeg is the 10th largest freshwater lake in the world, facing anthropogenic pressures such as high nutrient loads and invasive species. Despite ongoing research, there are still many unknowns about the lake's hydrology and ecology.
JOURNAL OF GREAT LAKES RESEARCH
(2021)
Article
Environmental Sciences
Christopher H. Marvin, Alicia Berthiaume, Deborah A. Burniston, Leah Chibwe, Alice Dove, Marlene Evans, L. Mark Hewitt, Peter Hodson, Derek C. G. Muir, Joanne Parrott, Philippe J. Thomas, Gregg T. Tomy
Summary: Polycyclic aromatic compounds (PACs) are widely distributed in the environment in Canada, with significant releases coming from the oil and gas industry and major cities acting as diffusion sources. Despite efforts to reduce PAC emissions through management actions, factors such as urbanization and vehicular emissions continue to increase the PAC load.
ENVIRONMENTAL POLLUTION
(2021)
Article
Biodiversity Conservation
Mariana Kluge, Maxime Wauthy, Karina Engelbrecht Clemmensen, Christian Wurzbacher, Jeffrey A. Hawkes, Karolina Einarsdottir, Milla Rautio, Jan Stenlid, Sari Peura
Summary: Climate change-driven permafrost thaw has a significant impact on pan-Arctic regions, leading to the formation of thermokarst ponds. The degradation of permafrost has a strong negative impact on aquatic fungal diversity, likely due to interactions with the released carbon pool from ancient deposits. This is expected to have implications for carbon cycling and climate feedback loops in the rapidly warming Arctic.
GLOBAL CHANGE BIOLOGY
(2021)
Article
Environmental Sciences
Elise Imbeau, Warwick F. Vincent, Maxime Wauthy, Mathieu Cusson, Milla Rautio
Summary: The study reveals that winter ice cover of boreal and Arctic lakes contains significant amounts of organic material, which when released into the water at ice melt, may stimulate lake ecosystem productivity. Particulate and dissolved materials in the ice play an important role in influencing the biogeochemical composition of lake ecosystems.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Review
Environmental Sciences
Joachim Jansen, Sally MacIntyre, David C. Barrett, Yu-Ping Chin, Alicia Cortes, Alexander L. Forrest, Allison R. Hrycik, Rosemary Martin, Bailey C. McMeans, Milla Rautio, Robert Schwefel
Summary: This article discusses the physical processes in lakes during winter, as well as the developments in under-ice biogeochemistry and ecology. It highlights the interaction between these processes, identifies existing knowledge gaps, and presents novel methods to address outstanding questions.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Engineering, Environmental
Sarah L. Roberts, Jane L. Kirk, Derek C. G. Muir, Johan A. Wiklund, Marlene S. Evans, Amber Gleason, Allison Tam, Paul E. Drevnick, Ashu Dastoor, Andrei Ryjkov, Fan Yang, Xiaowa Wang, Greg Lawson, Martin Pilote, Jonathan Keating, Benjamin D. Barst, Jason M. E. Ahad, Colin A. Cooke
Summary: The study found that anthropogenic atmospheric Hg deposition in western Canada is showing a synchronous decreasing trend, while increasing in the east, with spatial patterns mainly driven by longitude and proximity to point sources. Recent sediment-derived Hg fluxes were consistent with wet deposition monitoring results, validating the reliability of the research method.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Ecology
Craig A. Emmerton, Paul E. Drevnick, Jessica A. Serbu, Colin A. Cooke, Jennifer A. Graydon, Megan Reichert, Marlene S. Evans, Mark E. McMaster
Summary: This study investigates the concentrations and yields of total mercury (THg) and methylmercury (MeHg) in small tributaries and major transboundary rivers, and associates these patterns with THg concentrations in fish tissues. The results show that landscape conditions influence the changes of Hg in rivers and the concentrations of Hg in fish tissues. Site-specific monitoring of THg and MeHg concentrations in water and fish is crucial for assessing regional-level patterns in fish tissue concentrations.
Article
Environmental Sciences
Mehdi Moslemi-Aqdam, Leanne F. Baker, Jennifer L. Baltzer, Brian A. Branfireun, Marlene S. Evans, Brian D. Laird, George Low, Mike Low, Heidi K. Swanson
Summary: The concentrations of mercury in fish are influenced by complex biogeochemical and ecological interactions. These interactions have profound effects on fish mercury concentrations, particularly in northern latitudes. The study found that fish growth rates and concentrations of methylmercury in benthic invertebrates are important factors affecting mercury concentrations in Northern Pike. These variables are influenced by concentrations of dissolved organic carbon, methylmercury, and total mercury in lakes, which are ultimately driven by catchment characteristics.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Brigitte Simmatis, Kathleen M. Ruhland, Marlene Evans, Carsten Meyer-Jacob, Jane Kirk, Derek C. G. Muir, John P. Smol
Summary: This study investigated the impact of a copper-zinc smelter in Flin Flon, Manitoba on Phantom Lake by analyzing biological and geochemical proxies in a sediment core collected seven years after the smelter closed in 2010. The results showed that smelting activities led to increased metal concentrations in sediments, significant effects on diatom records, and reduced lake-water total organic carbon.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Ecology
Sabrina Gignac Brassard, Milla Rautio, Andrea Bertolo
Summary: Different physical factors such as solar radiation and wind have strong vertical gradients in lake water columns and affect the distribution of aquatic organisms. The vertical distribution of zooplankton in lakes is influenced by multiple factors including light, resources, and predation. This study investigates the vertical distribution of zooplankton in boreal lakes, showing that both predation and resources are associated with depth selection, but different taxa have different responses to each factor. The presence of stenothermic fish in boreal lakes also affects zooplankton behavior differently compared to the classical Diel Vertical Migration (DVM) paradigm.
FRESHWATER BIOLOGY
(2023)
Article
Marine & Freshwater Biology
Adam Kuhrt, Jordan Musetta-Lambert, Michael Power, Milla Rautio, Joseph Culp
Summary: This study compares the efficacy of morphological gut content analysis, DNA metabarcoding, and stable isotope analysis in analyzing the diet of fish from Arctic tundra streams. Differences in diet estimation between methods highlight the importance of choosing appropriate diet analysis methods to accurately assess fish diet.
Article
Limnology
E. Henriikka Kivila, Vilmantas Preskienis, Noemie Gaudreault, Catherine Girard, Milla Rautio
Summary: Climate change is causing changes in the winter regime of boreal lakes, resulting in reduced snow and ice cover duration. The duration, extent, and quality of ice and snow cover play a crucial role in lake production and carbon cycling.
LIMNOLOGY AND OCEANOGRAPHY
(2023)