Article
Environmental Sciences
Veronika Slobodnikova, Ladislav Hamerlik, Marta Wojewodka-Przybyl, Lucia Sochuliakova, Katarzyna Szarlowicz, Krisztina Buczko, Timea Chamutiova, Marcela Sedlackova Pridalova, Peter Bitusik
Summary: We analysed a sediment sequence to study the effects of fish introduction in an alpine lake. The results showed two main lake development stages, with the first stage coinciding with the co-occurrence of brown trout and alpine bullhead. The second stage was likely related to the ban on fish manipulations and grazing, with an increase in cladocerans indicating the possible extirpation of trout and a steep rise in thermally plastic chironomid taxa reflecting climate warming.
Article
Ecology
Yurie Otake, Hajime Ohtsuki, Jotaro Urabe, Shigeko Kimura, Kazuyoshi Yamada, Takehito Yoshida
Summary: The study analyzed the succession of cladoceran communities in a eutrophic lake in Japan, revealing that benthic species were gradually replaced by pelagic ones after eutrophication, with the latter being more influenced by predators.
ECOLOGY AND EVOLUTION
(2021)
Article
Geochemistry & Geophysics
Zhoufei Yu, Baohua Li, Hongliang Li, Jingling Zhang, Jianfang Chen
Summary: This study investigates the seasonal calcification depth variations of four common species of planktonic foraminifera by analyzing their stable oxygen isotope composition. The findings show that the depth habitat change affects the calcite 818O on seasonal timescales, and the seasonal depth habitat follows the isothermals. The research also proposes a new approach for quantifying the effect of seasonal calcification depth changes on the 818O signature of planktonic foraminiferal tests.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
R. Matsuda, R. Makabe, M. Sano, S. Takao, M. Moteki, N. Kurosawa
Summary: In the Southern Ocean, dinoflagellates that resemble fecal pellets (FLDs) were discovered, which have been mistakenly classified as fecal pellets and overlooked in their role in the carbon cycle. By gene sequencing, FLD cells were identified as Gyrodinium rubrum and Gyrodinium heterogrammum, and it was found that FLDs can potentially excrete larger fecal pellets and have a higher sinking rate compared to other protozoa and dinoflagellate cysts. FLDs can contribute up to 32% of the particulate organic carbon flux.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Plant Sciences
Tatiana A. Belevich, Irina A. Milyutina, Aleksey V. Troitsky
Summary: This study explored the seasonal cycle of microbial eukaryote diversity using NGS and a 10-month sediment trap, revealing the significant role of photosynthetic eukaryotes in the dynamic seasonal changes.
Article
Oceanography
Ayumi Maeda, Azumi Kuroyanagi, Akira Iguchi, Birgit Gaye, Tim Rixen, Hiroshi Nishi, Hodaka Kawahata
Summary: This study analyzed sediment trap samples from the southwestern Bay of Bengal to examine the abundance and assemblages of planktic foraminifers and their potential as indicators of climate and ocean processes. The results showed that the flux of planktic foraminifers is mainly governed by seasonal surface and subsurface primary production, with peaks during monsoon seasons and minimal values in spring. The consistent features of the flux pattern suggest a long-term pattern in the southwestern Bay of Bengal.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Oceanography
Jong-Ku Gal, Sun-Yong Ha, Jisoo Park, Kyung-Hoon Shin, Dongseon Kim, Nan-Young Kim, Sung-Ho Kang, Eun Jin Yang
Summary: Satellite observations and modeling data show an increase in net primary production in the Arctic Ocean due to retreating sea ice and warming, with under-ice blooms becoming more important. The role of sea-ice algae in these blooms is still unknown due to limited observations.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Engineering, Marine
Sikandar Hayat, Elisavet Skampa, Alexandra Gogou, Spyros Stavrakakis, Constantine Parinos, Maria Triantaphyllou
Summary: This study explores the coccolith flux and its seasonal variability at the deepest part of the Mediterranean Sea, showing higher flux in late winter-early spring and lower flux in summer. Emiliania huxleyi is the dominant species, followed by Florisphaera profunda. The higher flux at the deepest site compared to shallower depths may be due to lateral advection, resuspension, and/or the influence of Eastern Mediterranean Deep Waters (EMDWs).
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Hui-Ling Lin, Hon-Kit Lui, Tai-Chun Lin, You-Lin Wang
Summary: Foraminifera play a crucial role in the carbon cycle and paleoclimatology. This study examines the responses of foraminifera to climate and seawater chemistry changes at the South China Sea. The results show that the winter monsoon and El Nino-Southern Oscillation have significant impacts on foraminiferal productivity and fluxes.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Marine & Freshwater Biology
Jingkang Wang, Jie Li, Qi Cao, Patrick Rioual, Guoliang Lei, Binggui Cai, Yafei Zou, Hai Luo, Quanguo Li, Luo Wang
Summary: This study monitored the diatoms in Douhu Lake in subtropical southeast China and found that water temperature directly drives the fluctuation of Aulacoseira species abundance, while the seasonal succession has limited impact.
Article
Environmental Sciences
Karina Apolinarska, Krzysztof Pleskot, Aleksandra Pelechata, Michal Migdalek, Mariusz Pelechaty
Summary: The study on stable isotopes in Lake Kierskie, Poland, revealed seasonal variations and factors influencing the carbon and oxygen isotopic disequilibria in calcite. It is recommended to consider seasonal changes in isotopic studies for more accurate results.
JOURNAL OF PALEOLIMNOLOGY
(2021)
Article
Geography, Physical
A. J. Baxter, L. G. J. van Bree, F. Peterse, E. C. Hopmans, L. Villanueva, D. Verschuren, J. S. Sinninghe Damste
Summary: The study on isoGDGTs and archaeal abundance in Lake Chala revealed low levels of both, with IPL GDGT-0 primarily found in the anoxic lower water column below 90 meters depth. Seasonal variation did not strongly impact isoGDGTs, but high concentrations of GDGT-0 may be linked to specific environmental conditions.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Environmental Sciences
T. Masset, V. Frossard, M. E. Perga, N. Cottin, C. Piot, S. Cachera, E. Naffrechoux
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Editorial Material
Ecology
M. E. Perga, M. Syarki, N. Kalinkina, D. Bouffard
Article
Environmental Sciences
Yann Guenand, Marie-Elodie Perga, Vincent Chanudet, Damien Bouffard
Article
Ecology
Marie-Elodie Perga, Maria Syarki, Jorge E. Spangenberg, Victor Frossard, Emilie Lyautey, Natalia Kalinkina, Damien Bouffard
Summary: Zooplankton can spend winter actively under lake ice, with only a fraction contributing to an active food web due to limited and unrewarding feeding opportunities. Zooplankton fatty acids under ice mostly come from previously accumulated fat storage, with little contribution from under-ice seston assimilation. The food web under lake ice is supported by mixotrophic phytoplankton, resulting in few trophic linkages and low connectance in the planktonic community.
FRESHWATER BIOLOGY
(2021)
Article
Environmental Sciences
Rosalie Bruel, Stephanie Girardclos, Aldo Marchetto, Katrina Kremer, Christian Crouzet, Jean-Louis Reyss, Pierre Sabatier, Marie-Elodie Perga
Summary: Research shows that the plankton community of Lake Geneva experienced a significant shift over the past 1500 years, from relative stability in the past to a series of changes in modern times. Eutrophication acted as a key driving factor that made the lake more vulnerable to the impacts of climate change.
JOURNAL OF PALEOLIMNOLOGY
(2021)
Article
Environmental Sciences
Alfred Wuest, Damien Bouffard, Jean Guillard, Bastiaan W. Ibelings, Sebastien Lavanchy, Marie-Elodie Perga, Natacha Pasche
Summary: The open water platform on Lake Geneva offers a new approach for studying ecological processes in lakes, providing continuous access and a wide range of analytical capabilities. It supports multidisciplinary empirical research in limnology, atmospheric sciences, and remote sensing, and has already attracted a large number of projects due to its efficacy and necessity.
WILEY INTERDISCIPLINARY REVIEWS-WATER
(2021)
Article
Environmental Sciences
Nicolas Escoffier, Pascal Perolo, Thibault Lambert, Janine Ruegg, Daniel Odermatt, Thierry Adatte, Torsten Vennemann, Marie-Elodie Perga
Summary: This study investigated the mechanisms underlying a whiting event during the early summer of 2019 in Lake Geneva. The event started during a snowmelt period in the catchment at the Rhone River delta before spreading along the lake's northern shore and covering vast areas of its deeper basin. The development of the event depended upon the thermal stratification of the water column and the existence of a physically stable metalimnion.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Environmental Sciences
Gael Many, Nicolas Escoffier, Michele Ferrari, Philippe Jacquet, Daniel Odermatt, Gregoire Mariethoz, Pascal Perolo, Marie-Elodie Perga
Summary: This study uses remote sensing technology to analyze whiting events in Lake Geneva and finds that these events mainly occur in the northeastern part of the lake with highly reproducible environmental conditions. The inter-annual changes of whiting occurrences are significantly related to the Western Mediterranean and Atlantic oscillation indices.
Article
Environmental Sciences
Marie-Elodie Perga, Oriane Sarrasin, Julia Steinberger, Stuart N. Lane, Fabrizio Butera
Summary: By raising awareness of climate change, media coverage provides an opportunity for research to engage individuals and collectives in climate actions. However, the research highlighted by the media tends to be limited and focuses mainly on natural science and health aspects of climate change. This selective media coverage fails to promote real societal engagement and actions towards climate change.
GLOBAL ENVIRONMENTAL CHANGE-HUMAN AND POLICY DIMENSIONS
(2023)
Article
Limnology
Marie-Elodie Perga, Camille Minaudo, Tomy Doda, Florent Arthaud, Harsh Beria, Hannah E. Chmiel, Nicolas Escoffier, Thibault Lambert, Raphaelle Napolleoni, Biel Obrador, Pascal Perolo, Janine Ruegg, Hugo Ulloa, Damien Bouffard
Summary: By studying high-temporal resolution time series of dissolved oxygen concentration and temperature in 14 mountain lakes, it was found that the duration of bottom hypoxia under ice varies greatly among lakes and years. The variability of hypoxia duration is primarily explained by changes in the decay rate of dissolved oxygen above the lake bottom, which is linked to physical controls such as deep-water warming. The study also showed that the summer light climate is a key driver of the dissolved oxygen decay rate and hypoxia duration under the ice.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Nicolas Escoffler, Pascal Perolo, Gael Many, Natacha Tofleld Pasche, Marie-Elodie Perga
Summary: In hardwater lakes, calcite precipitation plays an important role in the lacustrine carbon cycle, but its dynamics and factors are still poorly understood. This study analyzed high-frequency data from Lake Geneva and found that calcite precipitation occurred during warm stratified periods when surface water CO2 concentrations were below atmospheric equilibrium. The study also revealed the daily variability and relationship between calcite precipitation and autotrophic metabolism.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Limnology
Pascal Perolo, Nicolas Escoffier, Hannah E. Chmiel, Gael Many, Damien Bouffard, Marie-Elodie Perga
Summary: In alkaline freshwater systems, bicarbonates can support gross primary production (GPP) even at low CO2 concentrations. However, the contribution of bicarbonates to GPP in lakes has not been quantified throughout the seasons. This study analyzes the daily stoichiometric ratios of CO2-O-2 and alkalinity-O-2 in a deep hardwater lake, revealing that alkalinity is the dominant inorganic carbon source for GPP in both littoral and pelagic environments during the stratified period.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Ecology
Thibault Lambert, Pascal Perolo, Nicolas Escoffier, Marie-Elodie Perga
Summary: This study investigates the impact of human land use on dissolved organic matter (DOM) and bacterial respiration in the Lake Geneva basin. The results suggest that agriculture and urbanization have a significant influence on bacterial respiration, but a limited impact on net carbon exchanges between inland waters and the atmosphere.
Article
Geosciences, Multidisciplinary
Pascal Perolo, Bieito Fernandez Castro, Nicolas Escoffier, Thibault Lambert, Damien Bouffard, Marie-Elodie Perga
Summary: The gas transfer velocity (k) is a major source of uncertainty in assessing lake-atmosphere gas exchange. Existing models vary in predictions, with turbulence level near the air-water interface being a key factor affecting transfer rates. Wind shear and buoyancy-driven convection contribute to near-surface turbulence, impacting gas transfer in lakes.
EARTH SYSTEM DYNAMICS
(2021)
Article
Geosciences, Multidisciplinary
Harriet L. Wilson, Ana Ayala, Ian D. Jones, Alec Rolston, Don Pierson, Elvira de Eyto, Hans-Peter Grossart, Marie-Elodie Perga, R. Iestyn Woolway, Eleanor Jennings
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2020)