Article
Environmental Sciences
Huimin Xu, Dayong Zhao, Jin Zeng, Zhigang Mao, Xiaohong Gu, Qinglong L. Wu
Summary: Aquaculture has significant impacts on freshwater lakes, particularly on plankton communities. In this study, the effects of aquaculture on water quality, plankton diversity, and plankton metacommunity co-occurrence patterns were examined in a shallow freshwater lake. The results showed that ecological aquaculture was more efficient in nitrogen removal than ecological restoration. Moreover, lower bacterioplankton diversity but higher phytoplankton and zooplankton diversity were observed in the ecological aquaculture and ecological restoration zones. The lower network connectivity of the plankton metacommunities in these zones suggested a possible lower resistance to future disturbance. Additionally, different mechanisms drove plankton communities of different trophic levels.
ENVIRONMENTAL POLLUTION
(2022)
Article
Biodiversity Conservation
Ruibo Yang, Xian Fan, Lei Zhao, Kun Yang
Summary: In lake ecosystems, regime shifts can change the composition and structure of phytoplankton communities. This study analyzed long-term observations in Erhai Lake, China, and found a distinct regime shift between 2001 and 2003. Before the shift, the lake was oligotrophic and dominated by Cyanophyta, Bacillariophyta, and Cryptophyta. After the shift, the community became eutrophic and dominated by Cyanophyta, Chlorophyta, and Bacillariophyta, with light becoming the primary driver for community succession.
ECOLOGICAL INDICATORS
(2023)
Article
Environmental Sciences
Chaowei Lai, Zhen Ma, Zaihua Liu, Hailong Sun, Qingchun Yu, Fan Xia, Xuejun He, Qian Bao, Yongqiang Han, Xing Liu, Haibo He
Summary: This study investigated the relationships between phytoplankton and dissolved inorganic carbon (DIC) concentrations, as well as carbon isotopic composition, nutrients, and hydrochemistry in Erhai Lake. The results showed that DIC significantly affected phytoplankton productivity and community composition, particularly inhibiting harmful cyanobacteria blooms. Therefore, considering DIC could effectively assist in mitigating lake eutrophication.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Review
Environmental Sciences
Song-Shun Lin, Shui-Long Shen, Annan Zhou, Hai-Min Lyu
Summary: This study summarizes the sources and mechanisms that trigger eutrophication in lakes, and discusses effective tools for evaluating the degree of eutrophication. Using Lake Erhai as a case study, it was found in a mesotrophic state with N and P co-limitation before 2006, and only P limitation since then. Effective measures for maintaining sustainable development in the watershed and a framework for an early warning system utilizing GIS and RS technologies for preventing eutrophication are proposed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Microbiology
Gwendoline M. David, David Moreira, Guillaume Reboul, Nataliia V. Annenkova, Luis J. Galindo, Paola Bertolino, Ana I. Lopez-Archilla, Ludwig Jardillier, Purificacion Lopez-Garcia
Summary: Researchers studied planktonic microbial eukaryotic communities in Lake Baikal at different depths and latitudes, finding that depth had a significant effect on protist community stratification, while the influence of latitude gradient was marginal. Epipelagic communities were more interconnected than those in the dark water column, showing specific biotic interactions among different nutritional modes of microorganisms.
ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Multidisciplinary Sciences
Leon Dlugosch, Anja Poehlein, Bernd Wemheuer, Birgit Pfeiffer, Thomas H. Badewien, Rolf Daniel, Meinhard Simon
Summary: This study reveals distinct taxonomic and functional adaptations of microbial communities in the near-surface Atlantic and Southern Ocean, showing finely tuned genetic adaptations to regional conditions. Gene profiles exhibited higher distance-decay rates and biotic factors were identified as highly influential in explaining the observed patterns in functional profiles. Temperature and biogeographic province mainly explained the observed taxonomic patterns.
NATURE COMMUNICATIONS
(2022)
Article
Agronomy
Xiaolin Li, Annette B. G. Janssen, Maryna Strokal, Carolien Kroeze, Lin Ma, Yi Zhang, Yi Zheng
Summary: Due to their vulnerable ecosystem environments, plateau lakes in the southwest of China face a high risk of eutrophication. This study focused on Erhai Lake as a typical plateau lake and analyzed the temporal characteristics of nitrogen inputs and identified the main pollution sources. The findings provide insights for effective lake protection policies for Erhai Lake and other plateau lakes.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Environmental Sciences
Boglarka Somogyi, Emil Boros, Nora Szabo-Tugyi, Attila W. Kovacs, Lajos Voros
Summary: This study aims to assess the impact of macrophyte cover on planktonic microbial communities and the balance between autotrophy and heterotrophy/chemoorganotrophy in a shallow lake. The results show an uncoupling between bacterioplankton and phytoplankton due to high organic carbon content from emergent macrophytes. This separation leads to a shift in metabolic processes and an increase in the significance of microbe-based carbon pathways in the littoral zone. The findings also suggest that increasing macrophyte cover weakens the efficiency of carbon transport through the planktonic food chain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Microbiology
Naaman M. Omar, Ondrej Prasil, J. Scott P. McCain, Douglas A. Campbell
Summary: Marine phytoplankton have varying sizes and cell suspension densities, which determine their influence on the environment. Hydrogen peroxide plays a crucial role in cell-to-cell exchanges, but its diffusion is limited by intercellular spacing.
Article
Microbiology
Anju Gautam, Gavin Lear, Gillian D. Lewis
Summary: By modeling temporal differences in stream bacterial communities, we were able to quantify the major environmental drivers of stream bacterial population dynamics, including cyclical seasonal variation and sporadic bloom events. Our models showed that bloom events and seasonal episodes significantly modify biofilm bacterial populations, indicating the thriving of distinct microbial taxa during these periods. These findings provide insights into how temporal environmental changes affect community assembly and can guide the selection of appropriate statistical models for predicting future community responses to environmental change.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Environmental Sciences
Liang Zheng, Zeyu An, Xiaoling Chen, Hai Liu
Summary: This study analyzed changes in water volume and quality in Erhai Lake from 2000 to 2019, finding an increase in water storage and nitrogen concentration. Climate factors were the main influence on water volume changes, while human activities, particularly agricultural pollution in the northern basin and economic development, urbanization, and tourism in the southern basin, affected water quality.
Article
Limnology
Flavia Dory, Laurent Cavalli, Evelyne Franquet, Magalie Claeys-Bruno, Benjamin Misson, Thierry Tatoni, Celine Bertrand
Summary: This study found that summer phytoplankton dynamics influenced microbial responses to DOC additions in high-altitude lakes, with bacteria consuming more glucose in early summer but biomass increasing more with glucose addition in late summer. There was greater competition between bacteria and phytoplankton in late summer, linked to nutrient limitation patterns. The research highlights the differential responses depending on the timing of summer DOC inputs and predicts increased heterotrophic and mixotrophic processes in planktonic communities of shallow high-altitude lakes in the face of global changes.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Baoli Wang, Xinyue Yang, Si-Liang Li, Xia Liang, Xiao-Dong Li, Fushun Wang, Meiling Yang, Cong-Qiang Liu
Summary: The study reveals that the hydraulic load of hydropower reservoirs is a key factor influencing stratification, gas fluxes, nutrient retention efficiency, and microbial diversity. Regulating the hydraulic load can mitigate the environmental impacts of hydropower dams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Microbiology
Angelina Cordone, Giuseppe D'Errico, Maria Magliulo, Francesco Bolinesi, Matteo Selci, Marco Basili, Rocco de Marco, Maria Saggiomo, Paola Rivaro, Donato Giovannelli, Olga Mangoni
Summary: This study investigated the bacterial diversity in the surface waters of the Ross Sea in relation to phytoplankton community structure during the Austral summer 2017. The results showed partially overlapping bacterioplankton communities between the coastal waters and open waters, with dominant members belonging to Bacteroidetes and Proteobacteria. The study also revealed differences in phytoplankton biomass, bacterial groups, and environmental factors between the two locations.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Environmental Sciences
Yao Zhang, Jian Shen, Ji-meng Feng, Xue-ying Li, Hua-ji Liu, Xin-ze Wang
Summary: Lake sediment is an important storage area for organic carbon (OC), but research on sediment organic carbon (SOC) is limited and the impact of environmental variables on SOC pools is not well understood. This study used physicochemical and spectroscopic analyses to investigate the composition, distribution, and sources of OC in surface sediments of China's Erhai Lake, as well as the relationship between environmental variables and SOC pools. The findings revealed that the SOC pool in the lake primarily consists of labile organic carbon fractions generated by algal production. Humus carbon content was relatively low, with fulvic acid carbon being dominant. The dissolved organic matter in both water column and sediments was largely influenced by endogenous production, with a significant contribution from phytoplankton. Sediment chlorophyll a showed the strongest correlation with the SOC pool, indicating the important influence of algae on SOC. The southern region of the lake, which receives contributions from algae, other microorganisms, and sewage, has a greater potential to release organic matter into the water column. On the other hand, the central and northern regions have stable SOC pools and stronger capacity to store OC due to the input of terrestrial refractory organic matter from runoff.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
