Article
Environmental Sciences
Maria Anton-Pardo, Milan Muska, Tomas Juza, Ivana Vejrikova, Lukas Vejrik, Petr Blabolil, Martin Cech, Vladislav Drastik, Jaroslava Frouzova, Michaela Holubova, Milan Riha, Zuzana Sajdlova, Marek Smejkal, Jiri Peterka
Summary: Temporal and spatial heterogeneity in the distribution of cladocerans in lakes is influenced by abiotic and biotic factors. The diel vertical and horizontal migrations of cladocerans were studied in two deep lakes in the Czech Republic, revealing differences in distribution patterns due to macrophyte cover and fish assemblages. Temporal variations and diurnal deficits in cladoceran assemblages were observed in both lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Fan Qin, Marc Amyot, Andrea Bertolo
Summary: The production of highly toxic monomethylmercury (MeHg) is unevenly distributed in the water column. The role of water column heterogeneity, especially zooplankton grazers, in mercury (Hg) cycling is still not well understood. This study found a significant association between the presence of zooplankton and the concentrations of dissolved total Hg (DTHg) and total Hg (THg) in the water. Results suggest that the heterogeneity of biotic factors, including phytoplankton and zooplankton, plays a key role in the cycling of total Hg and MeHg in boreal lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Marine & Freshwater Biology
Mustafizur M. Rahman
Summary: This study found that the Kuantan River and its estuary are oligotrophic, with 32 species of copepods primarily affected by temperature, salinity, and phytoplankton density. Copepod density was higher in the estuary compared to the upstream area, and they were positively influenced by salinity but negatively influenced by water temperature.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Environmental Sciences
Ruping Ge, Yixuan Li, Hongju Chen, Facan Lei, Yunyun Zhuang, Guangxing Liu
Summary: Understanding the diel vertical migration patterns of zooplankton is important for biological pumping and pelagic food webs. However, limited knowledge exists about the DVM patterns of zooplankton with different functional traits. This study used a trait-based approach to investigate the vertical distributions of zooplankton in the North Pacific Subtropical Gyre, and found that different functional groups exhibited distinct DVM patterns.
FRONTIERS IN MARINE SCIENCE
(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
Environmental Sciences
Jun Pan, Fangping Cheng, Fei Yu, Yongqiang Shi, Fan Sun, Guangcheng Si, Chuanjie Wei, Xinyuan Diao, Yongfang Zhao
Summary: Calanus sinicus, a key species in Chinese coastal marine ecosystems, shows fluctuations in population size due to temperature changes. Research indicates that the main population prefers to stay below the subsurface chlorophyll a maximum layer in the Yellow Sea Cold Water Mass throughout the summer, exhibiting a diel vertical migration trend for feeding. Factors influencing these behaviors include temperature, dissolved oxygen concentrations, and column depth.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Nicolas Weidberg, Nestor Santana Hernandez, Angelika H. H. Renner, Stig Falk-Petersen, Sunnje L. Basedow
Summary: Large swarms of mesozooplankton species aggregate in response to hydrographic structures in the ocean, with environmental factors such as the buoyant layer of the Norwegian Coastal Current influencing their distribution. The study also suggests that copepods perform short range diel vertical migration within the patch. Potential changes in the seasonality and structure of the current may impact swarm occurrence and formation in the future.
JOURNAL OF MARINE SYSTEMS
(2022)
Article
Environmental Sciences
Vladimir G. Dvoretsky, Alexander G. Dvoretsky
Summary: The winter zooplankton community in Lake Kulonga, located in the Arctic regions of Russia, exhibited specific dynamics influenced by the density of fish predators. The copepod Macrocyclops albidus dominated in terms of biomass at deep-water stations, while old copepodites of Cyclops spp. were prevalent at deep-water stations in terms of abundance. Overall, the abundance and biomass of zooplankton in winter showed significant variations among different taxa and stations.
Article
Engineering, Multidisciplinary
Yi-Chen Wang, Su-Chen Tsai, Wen-Yu Chen
Summary: The study investigated the diel migration distribution of larval fish near the Kuroshio Current by collecting samples from six depths at a fixed station in Yilan Bay. It found that larval fish density varied over time and the vertical distribution was influenced by the diurnal and nocturnal migration of dominant species.
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY-TAIWAN
(2021)
Article
Environmental Sciences
Ryan P. Bos, Tracey T. Sutton, Tamara M. Frank
Summary: Vertical migrations into shallower waters at night benefit migrators by reducing predation risk and encountering more prey. However, a portion of migrating populations may stay at depth, possibly due to the Hunger-Satiation hypothesis. Some crustacean and fish species support this hypothesis, while others do not, suggesting stomach fullness is just one factor in regulating vertical migration.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Meteorology & Atmospheric Sciences
Alexander G. Ostrovskii, Elena G. Arashkevich, Vladimir A. Solovyev, Dmitry A. Shvoev
Summary: Observations at the northeastern Black Sea research site from 2010-2020 revealed the dynamics and evolution of mesozooplankton vertical distribution in oxygen-deficient conditions through analysis of sound-scattering layers. Data collected via profiler mooring and zooplankton net sampling showed two sound-scattering maxima from spring to early autumn, corresponding to daytime aggregations and a persistent monospecific layer of diapausing fifth copepodite stages. Seasonal variability of sound-scattering mesozooplankton layers is essential for understanding biogeochemical processes in oxygen-deficient waters.
Article
Multidisciplinary Sciences
Nur Garcia-Herrera, Astrid Cornils, Juergen Laudien, Barbara Niehoff, Juan Hoefer, Guenter Foersterra, Humberto E. Gonzalez, Claudio Richter
Summary: Through studying the seasonal and diel changes of the zooplankton community in Comau Fjord, it was found that zooplankton biomass was highest in summer and lowest in winter, while abundance peaked in spring. Copepods were identified as the most important group in terms of abundance and biovolume.
Article
Fisheries
M. J. Kingsford, R. G. Cole
Summary: Multifactorial sampling designs were used to determine the vertical distribution of ichthyoplankton at multiple temporal and spatial scales in New Zealand. Consistent patterns of abundance were found across different depths and sites, suggesting that depth-related factors influence the vertical distribution of fish larvae. Diel vertical movements were also detected, indicating that day-night patterns affect the distribution of certain taxa.
MARINE AND FRESHWATER RESEARCH
(2022)
Article
Marine & Freshwater Biology
Steven R. Chipps, David H. Bennett, David Deslauriers, Lars G. Rudstam
Summary: The study evaluated the effect of moonlight intensity on the feeding and growth of the freshwater opossum shrimp. It found that when not limited by moonlight, the shrimp had higher feeding and growth rates. These findings highlight the importance of predator avoidance for the fitness and metabolic efficiency of the freshwater opossum shrimp.
Article
Marine & Freshwater Biology
Young Kyun Lim, Jin Ho Kim, Hyejoo Ro, Seung Ho Baek
Summary: This study investigated the effect of high temperature conditions on the diel vertical migration (DVM) of the harmful dinoflagellate Cochlodinium polykrikoides, which causes mass mortality of farmed fish. The field and laboratory results indicate that C. polykrikoides uses thermotaxic DVM as an important ecological strategy to optimize environmental conditions for growth through vertical positioning and changing migration velocity.
Article
Ecology
Toru Hirawake, Masaki Uchida, Hiroto Abe, Irene D. Alabia, Tamotsu Hoshino, Shota Masumoto, Akira S. Mori, Jun Nishioka, Bungo Nishizawa, Atsushi Ooki, Akinori Takahashi, Yukiko Tanabe, Motoaki Tojo, Masaharu Tsuji, Hiromichi Ueno, Hisatomo Waga, Yuuki Y. Watanabe, Atsushi Yamaguchi, Youhei Yamashita
Summary: This article provides comprehensive insights into the results and major findings from the Arctic Challenge for Sustainability (ArCS) Project, which aims to address the responses of Arctic marine and terrestrial ecosystems to global warming. The studies have identified biogeochemical processes associated with sea ice decline in the marine ecosystem, and factors important for the understanding of terrestrial biodiversity and ecosystems under global warming in the terrestrial ecosystem. Additionally, novel fungal species from the Arctic terrestrial ecosystem have been isolated and described.
Article
Ecology
Atsushi Yamaguchi, Fumihiko Kimura, Yuri Fukai, Yoshiyuki Abe, Kohei Matsuno, Atsushi Ooki, Toru Hirawake
Summary: By analyzing the interactions between environmental parameters and planktonic stocks in the northern Bering Sea in 2017 and 2018, significant differences were found between the two years. The phytoplankton bloom in 2018 was smaller and shorter, potentially failing to transfer production and energy to higher trophic levels in the planktonic food web.
Article
Ecology
Shin Sugiyama, Naoya Kanna, Daiki Sakakibara, Takuto Ando, Izumi Asaji, Ken Kondo, Yefan Wang, Yoshiki Fujishi, Shungo Fukumoto, Evgeniy Podolskiy, Yasushi Fukamachi, Minori Takahashi, Sumito Matoba, Yoshinori Iizuka, Ralf Greve, Masato Furuya, Kazutaka Tateyama, Tatsuya Watanabe, Shintaro Yamasaki, Atsushi Yamaguchi, Bungo Nishizawa, Kohei Matsuno, Daiki Nomura, Yuta Sakuragi, Yoshimasa Matsumura, Yoshihiko Ohashi, Teruo Aoki, Masashi Niwano, Naotaka Hayashi, Masahiro Minowa, Guillaume Jouvet, Eef van Dongen, Andreas Bauder, Martin Funk, Anders Anker Bjork, Toku Oshima
Summary: The study highlights the rapid changes occurring in coastal environments along Greenland's coast under the influence of a warming Arctic climate, particularly with significant mass loss of ice caps and marine-terminating outlet glaciers. Research conducted through field and satellite observations, as well as measurements and sampling in fjords, revealed the important role of glacial meltwater in marine ecosystems.
Article
Chemistry, Multidisciplinary
Yuka Onishi, Akihiro Tuji, Atsushi Yamaguchi, Ichiro Imai
Summary: The study identified seagrass beds as the source of algicidal and growth-inhibiting bacteria in coastal ecosystems, which suppressed the growth of A. catenella and reduced toxin contamination in bivalves in Akkeshi-ko Estuary.
APPLIED SCIENCES-BASEL
(2021)
Article
Ecology
Takuma Matsumoto, Kohei Matsuno, Seiji Katakura, Hiromi Kasai, Atsushi Yamaguchi
Summary: The study on the protist community in the southern Okhotsk Sea revealed that diatoms were the predominant group, showing clear seasonal changes, while dinoflagellates and ciliates exhibited different dominant species in different seasons. The variations in the protist community were closely associated with water mass exchanges.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Microbiology
Yasuhide Nakamura, Akihiro Tuji, Katsunori Kimoto, Atsushi Yamaguchi, Rie S. Hori, Noritoshi Suzuki
Summary: The study thoroughly revised the phylogenetic affiliation of Oroscenidae, a family of Radiolaria with large siliceous skeletons, based on plankton sampling and molecular analyses. It was found that Oroscenidae and Thalassothamnidae have unique skeletal characteristics distinct from other radiolarian orders, leading to the establishment of a new order, Orodaria.
Article
Biodiversity Conservation
Max D. Campbell, David S. Schoeman, William Venables, Rana Abu-Alhaija, Sonia D. Batten, Sanae Chiba, Frank Coman, Claire H. Davies, Martin Edwards, Ruth S. Eriksen, Jason D. Everett, Yutaka Fukai, Mitsuo Fukuchi, Octavio Esquivel Garrote, Graham Hosie, Jenny A. Huggett, David G. Johns, John A. Kitchener, Philippe Koubbi, Felicity R. McEnnulty, Erik Muxagata, Clare Ostle, Karen Robinson, Anita Slotwinski, Kerrie M. Swadling, Kunio T. Takahashi, Mark Tonks, Julian Uribe-Palomino, Hans M. Verheye, William H. Wilson, Marco M. Worship, Atsushi Yamaguchi, Wuchang Zhang, Anthony J. Richardson
Summary: The study provides strong support for Bergmann's rule in marine copepods, showing that temperature is a key factor in determining body size. Other drivers, such as food availability, also play a role in modifying this pattern. Smaller copepod species may benefit as 'winners' in a warming world, potentially impacting fisheries production and carbon sequestration rates.
Article
Fisheries
Bungo Nishizawa, Jumpei Okado, Yoko Mitani, Tomohiro Nakamura, Atsushi Yamaguchi, Tohru Mukai, Yutaka Watanuki
Summary: This study found that different species of foraging seabirds in the southwestern Okhotsk Sea exhibit distinct responses to environmental factors and prey biomass, which may be related to their foraging behaviors and methods of food detection.
Article
Oceanography
Yusuke Hamao, Kohei Matsuno, Yoko Mitani, Atsushi Yamaguchi
Summary: This study evaluated the species composition and spatial distribution of nano- and micro-protist communities in the southern part of the Okhotsk Sea off Hokkaido during the summer. The results showed that different water masses had distinct effects on the abundance and distribution of these communities.
JOURNAL OF OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Fumihiko Kimura, Kohei Matsuno, Yoshiyuki Abe, Atsushi Yamaguchi
Summary: A significant early sea-ice reduction event occurred in the northern Bering Sea in 2018, leading to unusual changes in multiple marine trophic levels. This study investigated the shifts in the zooplankton community and the effects of the early sea-ice melt events on zooplankton community, copepod population structure, and copepod production. The findings demonstrated the sensitivity of zooplankton community structure and production to environmental changes associated with early sea-ice reduction.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Marine & Freshwater Biology
Atsushi Yamaguchi, Carin J. Ashjian, Robert G. Campbell
Summary: This study describes the life cycles of two mesopelagic carnivorous copepods and their vertical distributions and population growth. The life cycles of Paraeuchaeta glacialis and Heterorhabdus norvegicus show different characteristics, with a skewed sex ratio towards females in P. glacialis and a complete life cycle within 1 year for H. norvegicus.
JOURNAL OF PLANKTON RESEARCH
(2022)
Article
Oceanography
Daiki Kojima, Yusuke Hamao, Kanako Amei, Yutaka Fukai, Kohei Matsuno, Yoko Mitani, Atsushi Yamaguchi
Summary: This study evaluated the quantitative information of faecal pellets in the plankton community of the southern Okhotsk Sea during early summer. Different types of zooplankton were found to contribute to the vertical material flux. The faecal pellets contained fluorescent phytoplankton cells and cyanobacteria, and coprophagy behavior was observed in calanoid copepods.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Environmental Sciences
Yunosuke Koguchi, Koki Tokuhiro, Carin J. Ashjian, Robert G. Campbell, Atsushi Yamaguchi
Summary: In this study, the vertical distributions and reproductive timing of a dominant calanoid copepod family in the mesopelagic layer of the Arctic Ocean were examined to understand their ecological dynamics and potential mechanisms of reducing species competition.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Naoya Kanna, Shin Sugiyama, Takuto Ando, Yefan Wang, Yuta Sakuragi, Toya Hazumi, Kohei Matsuno, Atsushi Yamaguchi, Jun Nishioka, Youhei Yamashita
Summary: An increasing body of work has shown the potential impacts of subglacial discharge from marine-terminating glaciers on the marine environment around Greenland. Upwelling of nutrients associated with rising buoyant plumes near the front of marine-terminating glaciers plays a key role in maintaining the high productivity of connected fjords. However, the response of protist communities to subglacial discharges into fjords remains poorly understood.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Marine & Freshwater Biology
Kanako Amei, Ryo Dobashi, Naoto Jimi, Minoru Kitamura, Atsushi Yamaguchi
Summary: This study investigated the vertical distribution of abundance, biomass, and community structure of pelagic polychaetes in the western subarctic Pacific based on day-night vertical samples collected from 0 to 1000 meters of water column. Ten pelagic polychaete species belonging to nine genera and six families were identified, and the community was divided into five communities based on abundance. Environmental factors such as water mass, food availability, and the oxygen minimum layer were found to affect the distribution of pelagic polychaete communities.
JOURNAL OF PLANKTON RESEARCH
(2021)