Article
Ecology
Ayla Murray, Kim Praebel, Andrea Desiderato, Holger Auel, Charlotte Havermans
Summary: Rapid warming in the Arctic is affecting marine ecosystems and the food web, with impacts on the abundance and distribution of Themisto amphipods. Two co-existing species, T. libellula and T. abyssorum, show contrasting levels of genetic diversity and connectivity in the study region. These patterns are potentially influenced by the Last Glacial Maximum and can contribute to predicting the future of zooplankton communities and food-web structure in the Arctic.
ECOLOGY AND EVOLUTION
(2023)
Article
Marine & Freshwater Biology
Thandy Junio da Silva Pinto, Giseli Swerts Rocha, Raquel Aparecida Moreira, Lais Conceicao Menezes da Silva, Maria Paula Cardoso Yoshii, Bianca Veloso Goulart, Cassiana Carolina Montagner, Michiel Adriaan Daam, Evaldo Luiz Gaeta Espindola
Summary: This study found that when pesticides enter the aquatic environment, they have negative effects on the feeding rates, biochemical markers, growth, and reproduction of the benthic organism Hyalella meinerti. These results indicate potential risks to the functioning of aquatic ecosystems due to pesticide use.
AQUATIC TOXICOLOGY
(2022)
Article
Multidisciplinary Sciences
Randi B. Ingvaldsen, Elena Eriksen, Harald Gjosaeter, Arill Engas, Birte Katarina Schuppe, Karen M. Assmann, Heather Cannaby, Padmini Dalpadado, Bodil A. Bluhm
Summary: In this study, we conducted 12 trawl hauls in ice covered waters in the Central Arctic Ocean to investigate the species composition and catch weight of pelagic fishes and larger zooplankton. Our findings revealed that both arctic and subarctic-boreal species were present in the study area, with three fish species identified. Different patterns of species distribution and dominance were observed in different regions, which may be attributed to ice and ocean circulation regimes.
SCIENTIFIC REPORTS
(2023)
Article
Genetics & Heredity
Elena V. Romanova, Yurij S. Bukin, Kirill V. Mikhailov, Maria D. Logacheva, Vladimir V. Aleoshin, Dmitry Y. Sherbakov
Summary: There are over 350 species of amphipods in Lake Baikal, with one pelagic amphipod species Macrohectopus branickii found to have an extremely long mitochondrial genome length, unique gene order, and expansions of non-coding regions. This anomaly was likely caused by duplications and inversions of regions containing ribosomal RNA genes, as revealed by statistical analysis.
Article
Multidisciplinary Sciences
Kristie S. T. Alleyne, Donald Johnson, Francis Neat, Hazel A. Oxenford, Henri Valles
Summary: The recent proliferation of pelagic Sargassum spp. in the Tropical Atlantic has caused significant ecological and socioeconomic impacts in the wider Caribbean region. The source of the Sargassum has been traced to a new bloom region called the North Equatorial Recirculation Region (NERR) located between the South Equatorial Current and the North Equatorial Counter Current. The study investigates the species and morphotype composition of Sargassum strandings in Barbados and identifies two distinct easterly sub-origins and/or transport pathways that contribute to the seasonal variation in morphotype abundance.
SCIENTIFIC REPORTS
(2023)
Article
Limnology
Doreen Kohlbach, Benoit Lebreton, Gael Guillou, Anette Wold, Haakon Hop, Martin Graeve, Philipp Assmy
Summary: Global warming causes dramatic environmental change to Arctic ecosystems, leading to changes in the availability and composition of pelagic and sympagic food sources. The study examined the importance of suspended particulate organic matter vs. sympagic organic matter for 12 zooplankton species, revealing complex and variable trophic structures and dependencies in different Arctic food webs.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Geosciences, Multidisciplinary
Haoyi Yao, Giuliana Panieri, Moritz F. Lehmann, Tobias Himmler, Helge Niemann
Summary: Current activities of cold seeps in the ocean can be observed directly through methane emissions from the seafloor, presence of chemosynthetic organisms, and high gas concentrations in sediment pore waters and the water column. Past activities can be reconstructed through proxy records of authigenic seep carbonates, which indicate anaerobic oxidation of methane in the seafloor environment.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Multidisciplinary Sciences
Mariana Kluge, Christian Wurzbacher, Maxime Wauthy, Karina Engelbrecht Clemmensen, Jeffrey Alistair Hawkes, Karolina Einarsdottir, Jan Stenlid, Sari Peura
Summary: This study collected samples from five permafrost sites across the circumpolar Arctic to analyze the DNA of aquatic fungi. The research found that thermokarst activity has an impact on fungal communities, contributing to the recycling of ancient carbon.
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
Fisheries
Chyng-Hwa Liou, Zhong-Fu Zhang
Summary: This study evaluates the effects of dietary soy lecithin and lipid levels on lipid utilization in white shrimp. The results suggest that the diet with 11% lipid and 1.8% lecithin shows optimal growth performance, hemolymph parameters, body texture, and immune responses in white shrimp.
Article
Genetics & Heredity
Annkathrin Dischereit, Owen S. Wangensteen, Kim Praebel, Holger Auel, Charlotte Havermans
Summary: This study applied DNA metabarcoding to analyze the stomach contents of two congeneric hyperiids, revealing significant differences in their diets and potential impacts of environmental changes.
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
Fisheries
Yuxiang Zhu, Kai Liao, Yang Liu, Hailong Huang, Yiheng Ma, Deshui Chen, Bin Ma, Jilin Xu
Summary: This study investigated the effects of different ratios of dietary carbohydrates/lipids on the growth performance, body composition, digestive enzyme activities, oxidative status, and transcriptome profile of juvenile razor clam Sinonovacula constricta. The optimal dietary carbohydrate/lipid ratio was found to be approximately 3.01, and a high-carbohydrate/low-lipid diet may suppress clam growth by inhibiting mTORC1 and activating autophagy, while poor growth performance in the low-carbohydrate/high-lipid diet group may be associated with high lipid peroxidation levels.
Article
Biochemistry & Molecular Biology
Juan Manuel Orozco Rodriguez, Hanna P. Wacklin-Knecht, Luke A. Clifton, Oliver Bogojevic, Anna Leung, Giovanna Fragneto, Wolfgang Knecht
Summary: In this study, the interaction between human and Escherichia coli DHODH with ubiquinone in lipid membranes was investigated using neutron reflectometry. The results showed that ubiquinone is located in the center of lipid bilayers, and both DHODHs penetrate into the outer lipid leaflet towards ubiquinone. The study also highlighted the importance of ubiquinone and lipid composition in enzyme binding.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
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
Ecology
Ander M. de Lecea, Ross Coppin, Margaux Noyon, Jenny A. Huggett
MARINE BIOLOGY RESEARCH
(2018)
Article
Oceanography
Margaux Noyon, Tamaryn Morris, David Walker, Jenny Huggett
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2019)
Article
Oceanography
Emma Rocke, Margaux Noyon, Michael Roberts
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Oceanography
Margaux Noyon, Zo Rasoloarijao, Jenny Huggett, Jean-Francois Ternon, Michael Roberts
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Oceanography
Francis Marsac, Pavanee Annasawmy, Margaux Noyon, Herve Demarcq, Marc Soria, Njaratiana Rabearisoa, Pascal Bach, Yves Cherel, Jacques Grelet, Evgeny Romanov
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Oceanography
Shael A. Harris, Margaux Noyon, Francis Marsac, Patrick Vianello, Michael J. Roberts
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Oceanography
Michael J. Roberts, Jean-Francois Ternon, Francis Marsac, Margaux Noyon, Andrew I. L. Payne
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Oceanography
Herve Demarcq, Margaux Noyon, Michael J. Roberts
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2020)
Article
Oceanography
Stuart C. Painter, Baraka Sekadende, Angelina Michael, Margaux Noyon, Salome Shayo, Brian Godfrey, Mtumwa Mwadini, Margareth Kyewalyanga
Summary: Oceanographic and biogeochemical observations in Pemba Channel during the South East monsoon show active upwelling, indicating N-limitation and susceptibility to anthropogenic N inputs. Despite only a 20% increase in local productivity, the response to upwelling is mainly influenced by picoplankton dominance in the phytoplankton community.
OCEAN & COASTAL MANAGEMENT
(2021)
Article
Oceanography
Margaux Noyon, Alex J. Poulton, Sarah Asdar, Riaan Weitz, Sarah L. C. Giering
Summary: The Agulhas Bank near southern Africa plays a crucial role in the success of commercially valuable fish species, but little is known about zooplankton distribution in this area. A survey conducted in March 2019 revealed a clear gradient of mesozooplankton abundance and biovolume from inner to outer shelf areas. The Central Agulhas Bank was dominated by copepods and doliolids, with high biomass and deep mixed layer depth.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Oceanography
Baraka C. Sekadende, Angelina Michael, Stuart C. Painter, Salome Shayo, Margaux Noyon, Margareth S. Kyewalyanga
Summary: The study identified 88 species of microphytoplankton in the Pemba Channel, with diatoms dominating the community. Though diatoms showed no spatial pattern, cyanobacteria displayed a significant latitudinal gradient. Numerous harmful phytoplankton species were identified, but their abundances were below harmful algal bloom warning thresholds. Regular phytoplankton monitoring programs are recommended to understand potential increases in harmful species due to anthropogenic activities.
OCEAN & COASTAL MANAGEMENT
(2021)
Article
Oceanography
Sarah Asdar, Zoe L. Jacobs, Ekaterina Popova, Margaux Noyon, Warwick H. Sauer, Michael J. Roberts
Summary: Climate change poses significant threats to the Agulhas Bank fishery, particularly the chokka squid fishery. Our simulations show that increased sea surface temperature and current velocity may pose risks to squid recruitment and growth, while food availability is expected to have a minor impact.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Oceanography
Sixolile L. Mazwane, Alex J. Poulton, Anna E. Hickman, Fatma Jebri, Zoe Jacobs, Mike Roberts, Margaux Noyon
Summary: This study examines the spatial and temporal dynamics of Net Primary Production (NPP) on Agulhas Bank (AB) using satellite-derived data. The results indicate that AB is a significant site of perennial moderate levels of NPP, with little interannual variability and a slight decline over time. These findings are important for understanding the ecosystem productivity of South African coastal fisheries.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Oceanography
Sarah L. C. Giering, Margaux Noyon, Brian Godfrey, Alex J. Poulton, Filipa Carvalho, Mike Roberts
Summary: The Agulhas Bank is a moderately productive and dynamic shelf ecosystem, where underwater visibility can be poor and high-turbidity events occur. The study found a cross-shelf gradient of near-bottom turbidity and distinct particle dynamics, with high new production and organic matter transport in the Port Alfred region and particle retention in the Central Agulhas Bank. Benthic nepheloid layers near the coast were likely formed by sediment resuspension.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Oceanography
Baraka Sekadende, Lucy Scott, Jim Anderson, Shankar Aswani, Julius Francis, Zoe Jacobs, Fatma Jebri, Narriman Jiddawi, Albogast T. Kamukuru, Stephen Kelly, Hellen Kizenga, Baraka Kuguru, Margareth Kyewalyanga, Margaux Noyon, Ntahondi Nyandwi, Stuart C. Painter, Matthew Palmer, Dionysios E. Raitsos, Michael Roberts, Sevrine F. Sailley, Melita Samoilys, Warwick H. H. Sauer, Salome Shayo, Yohana Shaghude, Sarah F. W. Taylor, Juliane Wihsgott, Ekaterina Popova
OCEAN & COASTAL MANAGEMENT
(2020)