Article
Ecology
Daikui Li, Ping He, Cunqi Liu, Jie Xu, Liping Hou, Xiuli Gao, Dewang Wang, Jiawen Wang
Summary: This study proposes a method to detect the threshold for cladocera to control cyanobacteria through edge scatter-segment regression. Analysis of field survey data from 242 sample sites in North China revealed that cladocera are the most effective group in controlling the abundance of cyanobacteria among zooplankton in natural ecosystems. The non-linear relationship between cladocera density and cyanobacteria density provides important insights for understanding the complex changes in aquatic ecosystems.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2022)
Article
History & Philosophy Of Science
Adam Brandenburger, Amanda Friedenberg, H. Jerome Keisler
Summary: The article introduces two mappings, one from Conditional Probability Systems (CPS's) to Lexicographic Probability Systems (LPS's), and another from LPS's with full support to CPS's. These mappings establish a relationship between strong belief (defined on CPS's) and assumption (defined on LPS's) at an abstract level in an extended probability-theoretic context.
Article
Marine & Freshwater Biology
Justin D. Chaffin, Judy A. Westrick, Laura A. Reitz, Thomas B. Bridgeman
Summary: Cyanobacteria harmful algal blooms can produce toxic cyanotoxins, with microcystins (MC) being the most studied group. Different MC congeners have varying levels of toxicity, and environmental stressors can affect their production. A study in Lake Erie found that nitrogen enrichment favored the production of nitrogen-rich MC-RR, while nitrogen depletion favored low-nitrogen MC-LA. The study also showed that the toxicity of MCs varied throughout the bloom season and that different analytical methods may overestimate or underestimate their toxicity.
Article
Geosciences, Multidisciplinary
Gilles Bourgault
Summary: This study demonstrates the benefits of probability transforming kriging estimates to improve the selection of spatial locations with values higher than a given threshold. The transform restores data variance in the estimates, increasing conditional bias but reducing bias for expected true values when selections are made based on the transformed estimates.
MATHEMATICAL GEOSCIENCES
(2022)
Article
Engineering, Environmental
Sisi Ye, Li Gao, Arash Zamyadi, Caitlin M. Glover, Ning Ma, Haiming Wu, Ming Li
Summary: The study found that cyanobacteria existed in the surrounding groundwater of Lake Taihu in China and determined the mechanism of cyanobacteria spreading through groundwater, with Microcystis having strong penetration capabilities. In addition, it was also discovered that cyanobacteria and their toxins had low concentrations in the groundwater.
Article
Environmental Sciences
Solveig Nachtigall, Christine Heim
Summary: The restoration of eutrophic river and lake ecosystems is important but often temporary, requiring reassessment and modification of restoration measures. This study found that Lake Seeburg functions as a sink for nitrogen, but has high phosphorous loading, contributing to eutrophication. Additionally, the lake's nutrient loading is not solely influenced by external inputs, but also by internal phosphorous release.
Article
Ecology
Claudie Ratte-Fortin, Karem Chokmani, Anas El Alem, Isabelle Laurion
Summary: This paper presents a novel model to estimate the conditional density of phytoplankton blooms based on environmental covariates and to project future scenarios of bloom phenology. Different climatic and physiographic scenarios have varying impacts on bloom frequency, with lakes of higher eutrophication levels being less responsive to land cover changes.
ECOLOGICAL MODELLING
(2022)
Article
Engineering, Environmental
Shouliang Huo, Hanxiao Zhang, Marie-Eve Monchamp, Rong Wang, Nanyan Weng, Jingtian Zhang, Hong Zhang, Fengchang Wu
Summary: This study explores the diversity and assembly patterns of eukaryotic algal (EA) and cyanobacterial (CYA) communities over a century in seven lakes and reservoirs in the North Temperate Zone. The results show temporal homogenization of algal communities within lakes, likely due to historical legacies, intensified anthropogenic activities, and climate warming. Both deterministic and stochastic processes play a role in algal community assembly.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Environmental Sciences
J. Muchiut, M. I. Rodriguez, A. L. Ruibal Conti, M. Ruiz, A. Rodriguez
Summary: This study presents the first numerical simulation of an algal bloom in the San Roque reservoir, calibrated by field measurements. The results indicate that water level and nutrient distribution have significant impact on phytoplankton biomass. Complete wastewater treatment leads to a significant reduction in algal bloom, while other techniques show little improvement. Additionally, the central point of the reservoir is the most representative in terms of phytoplankton biomass.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Manuela Morais, Alexandra Marcha Penha, Maria Helena Novais, Leonel Landim, Sonia Silva Victoria, Eduardo A. Morales, Luciana Gomes Barbosa
Summary: The study investigated the environmental descriptors and main factors influencing phytoplankton in five reservoirs in Santiago Island, Cape Verde. Differences in geological influence variables and high levels of P and N were found, with cyanobacteria dominating the phytoplankton community and posing a high risk due to toxin production. The results highlight the importance of integrated management plans for the reservoirs due to temporal-scale dependent processes and similar biogeographic patterns affecting phytoplankton community variation.
Article
Environmental Sciences
Larissa Souza Passos, Eryka Costa de Almeida, Alexandre Villela, Adilson Nunes Fernandes, Marcelo Manzi Marinho, Levy Carvalho Gomes, Ernani Pinto
Summary: This study assessed the pollution extent of a crucial public water supply reservoir in southeastern Brazil. The findings revealed high concentrations of cyanobacteria and cyanotoxins in the reservoir, posing a significant ecological risk to aquatic life. Additionally, the analysis showed that levels of metals, metalloids, and fecal bacteria were below the maximum permitted limit according to Brazilian legislation.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Environmental Sciences
Amy E. Grogan, Catharina Alves-de-Souza, Lawrence B. Cahoon, Michael A. Mallin
Summary: Nutrient-driven cyanobacteria blooms are increasingly common in freshwater environments, especially in anthropogenically altered landscapes. This study focused on stormwater retention ponds in urban and suburban areas, which are likely environments for harmful cyanobacteria blooms. The investigation assessed the taxonomic composition, bloom morphological composition, toxicity, and impact of nutrients and other environmental factors. The results showed that cyanobacteria blooms, especially potentially toxic genera, were most prevalent in the water column of stormwater retention ponds. The study also identified the presence of harmful cyanobacteria in various other freshwater environments.
Article
Environmental Sciences
Horacio Ernesto Zagarese, Nadia R. Diovisalvi, Maria de los Angeles Gonzalez Sagrario, Irina Izaguirre, Paulina Fermani, Fernando Unrein, Manuel Castro Berman, Gonzalo Luis Perez
Summary: The size structure of phytoplankton has a significant impact on food-web organization and energy transfer. Picocyanobacteria, which are smaller than 2 μm, are a major component of autotrophic plankton in Pampean lakes. The adoption of glyphosate-resistant crops has caused outbreaks of picocyanobacteria populations, resulting in reduced water transparency.
Article
Food Science & Technology
Morgane Le Moal, Alexandrine Pannard, Luc Brient, Benjamin Richard, Marion Chorin, Emilien Mineaud, Claudia Wiegand
Summary: Cyanobacterial blooms in eutrophic freshwater pose a global threat to ecosystems, human health, and the economy, requiring reliable predictions to support decision-making. Environmental drivers such as climate and anthropogenic pressures influence the development of cyanobacteria, with a focus on reducing phosphorus load to suppress blooms. High interannual variability in cyanobacterial development highlights the importance of long-term data series and the potential for a new equilibrium due to climatic pressure and nitrogen limitation.
Article
Engineering, Environmental
Elias Broman, Mindaugas Zilius, Aurelija Samuiloviene, Irma Vybernaite-Lubiene, Tobia Politi, Isabell Klawonn, Maren Voss, Francisco J. A. Nascimento, Stefano Bonaglia
Summary: Since the introduction of synthetic fertilizers over a hundred years ago, coastal oceans have faced increasing nutrient loading, resulting in eutrophication and extensive algal blooms. Studies show that in a large hypereutrophic lagoon, both dissimilatory nitrate reduction to ammonium (DNRA) and denitrification processes are active, with DNRA playing a crucial role in recycling fixed nitrogen in the ecosystem.
Article
Multidisciplinary Sciences
Tebkew Shibabaw, Abebe Beyene, Aymere Awoke, Mulat Tirfie, Muluken Azage, Ludwig Triest
Summary: This study in human-influenced rivers and streams in Ethiopia found that both season and land use factors significantly influenced diatom community composition and species richness. Physiochemical parameters affected by seasonal variation and human activities played a major role in shaping the diatom autecology in the region, highlighting the importance of considering runoff and dilution in biomonitoring efforts.
Article
Multidisciplinary Sciences
Ludwig Triest, Tom Van der Stocken, Dennis De Ryck, Marc Kochzius, Sophie Lorent, Magdalene Ngeve, Hajaniaina Andrianavalonarivo Ratsimbazafy, Tim Sierens, Rosa van der Ven, Nico Koedam
Summary: Genetic diversity and connectivity of Rhizophora mucronata was studied across a coastal stretch in the Western Indian Ocean, revealing genetic breaks between populations along the East African coastline, Mozambique Channel Area, granitic Seychelles, and Aldabra and northern Madagascar. The study demonstrated how oceanographic processes can connect and separate mangrove populations irrespective of geographic distance.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Yohannes Tefera Damtew, Boud Verbeiren, Aymere Awoke, Ludwig Triest
Summary: Lake Ziway, a large freshwater lake in the central Ethiopian rift valley, has shown changes in water level, decline in macrophyte distribution, and decrease in water surface area over a 30-year period. These changes are attributed to climate variability and human disturbances in the region.
Article
Environmental Sciences
Nur Fairuz-Fozi, Ludwig Triest, Nurul Ashikin Mat Zauki, Anne Marie Kaben, Bryan Raveen Nelson, Anil Chatterji, Mohd Fadzil Akhir, Behara Satyanarayana, Farid Dahdouh-Guebas
Summary: The study revealed that the horseshoe crab populations of Carcinoscorpius rotundicauda in the east, west, and south coasts of Peninsular Malaysia exhibit distinct genetic diversity and structure, with a genetic break located within the Strait of Malacca instead of the southern tip of the peninsula. This suggests that the convergence of ocean currents and mangrove habitats on the west coast play a more significant role in shaping the genetic diversity of populations, rather than the geographical barrier of the Malay Peninsula alone.
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
(2021)
Article
Biodiversity Conservation
Ludwig Triest, Tom Van der Stocken, Tim Sierens, Emmanuel K. Deus, Mwita M. Mangora, Nico Koedam
Summary: This study assessed genetic diversity and connectivity of mangrove populations in a proposed transboundary conservation area between Kenya and Tanzania. The results indicated a trend of overall migration directionality reflecting regional ocean surface current flows.
BIOLOGICAL CONSERVATION
(2021)
Article
Marine & Freshwater Biology
Stijn Van Onsem, Ludwig Triest
Summary: The study showed that the cover of duckweed affects the growth and reproduction of algae, causing the algae to grow longer internodes to escape stress, while there is a trade-off between reproductive efforts and vegetative elongation. The number of spores falling is affected by sunlight and the algae display an ability to adjust their growth time according to the pressure of duckweed.
Article
Plant Sciences
Jasper Dierick, Thi Thuy Hang Phan, Quang Doc Luong, Ludwig Triest
Summary: Human-induced land use in coastal areas is a main threat to seagrass meadows globally, but Enhalus acoroides shows greater resilience under high levels of disturbance compared to other coexisting seagrass species. Changes in reproductive strategy and seedling recruitment contribute to the persistence and resilience of E. acoroides meadows. The importance of sexual reproduction for population persistence should be prioritized in conservation measures to ensure long-term resilience.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Ecology
Raphael Ocelli Pinheiro, Ludwig Triest, Priscila F. M. Lopes
Summary: This study explores user preferences, assesses ecotourism potential of coastal activities, identifies provided cultural ecosystem services, main stressors, and user preferences for specific areas, providing support for the development of public strategies.
ECOSYSTEM SERVICES
(2021)
Article
Environmental Sciences
Abrehet Kahsay, Pieter Lemmens, Ludwig Triest, Luc De Meester, Mulugeta Kibret, Elie Verleyen, Enyew Adgo, Ayalew Wondie, Iris Stiers
Summary: This study explores the diversity patterns and community composition of plankton in different types of wetlands in the Lake Tana sub-basin, Ethiopia. It reveals that riverine papyrus swamps have higher local plankton richness, while lacustrine wetlands exhibit the highest ecological uniqueness for phytoplankton and riverine papyrus swamps for zooplankton. The findings emphasize the importance of protecting wetlands with high ecological uniqueness values for preserving the diverse plankton communities.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Ecology
Elias Luis Maxombe, Lucas Donizetti Vieira, Tim Sierens, Ludwig Triest, Rosane Garcia Collevatti
Summary: Wetlands are highly threatened ecosystems, with 70% of the global area having been lost since 1900. This study examined the spatial pattern of genetic diversity and population structure of Cyperus papyrus in Southeast Africa's wetlands. The results showed no evidence for unidirectional dispersal, with higher genetic diversity in upstream populations. The study also revealed the role of past demographic dynamics and isolation-by-distance in shaping genetic diversity and structure.
Article
Ecology
Abrehet Kahsay, Biadgilgn Demissie, Jan Nyssen, Ludwig Triest, Pieter Lemmens, Luc De Meester, Mulugeta Kibret, Elie Verleyen, Enyew Adgo, Iris Stiers
Summary: According to the study, the largest freshwater lake in Ethiopia, Lake Tana, and its tributary river, Gilgel Abay, have extensive papyrus swamps that are highly recognized for their ecological and economical value. However, the distribution and size of these swamps have not been systematically assessed, and the study found that their total surface area has declined by almost 55% in the past 35 years. The decline is mainly attributed to factors such as crop farming, livestock overgrazing, drainage, and biomass overharvesting.
Article
Ecology
Lise Beirinckx, Ludwig Triest, Bram Vanschoenwinkel
Summary: In a wetland system characterized by strong variation in salinity and hydro-regime, two congeneric species of submerged macrophytes were found to have different germination strategies, with salt and temperature being important cues. This variation in germination strategies is believed to contribute to the differentiation and speciation of these species.
FRESHWATER BIOLOGY
(2023)
Article
Biodiversity Conservation
Magdalene N. Ngeve, Nico Koedam, Ludwig Triest
Summary: This study utilized genetic markers to analyze drift propagules of Rhizophora racemosa in a coastal area of southern Cameroon, revealing their genetic relationship with adult trees and major mangrove populations along the Cameroonian coastline. Findings suggest that the investigated propagules, genetically isolated from Cameroonian populations, likely originated from more southern mangrove areas beyond the Cameroonian border, highlighting the complexities of long-distance dispersal events and the importance of transboundary biodiversity management efforts.
FRONTIERS IN CONSERVATION SCIENCE
(2021)
Article
Biodiversity Conservation
Ludwig Triest, Behara Satyanarayana, Olga Delange, Kishore Kumar Sarker, Tim Sierens, Farid Dahdouh-Guebas
Summary: The study of mangrove species in the Malay Peninsula revealed genetic differentiation between populations on different coasts and straits, highlighting the diversity in evolution and genetic structure. Furthermore, regional and geographic genetic connections were found among populations, indicating significant implications for future species conservation efforts.
FRONTIERS IN CONSERVATION SCIENCE
(2021)
Article
Biodiversity Conservation
Ludwig Triest, Jasper Dierick, Thi Thuy Hang Phan, Quang Doc Luong, Nguyen Quang Huy, Tim Sierens
Summary: This study demonstrates that lagoonal environments are highly unstable and have a significant impact on the distribution and structure of submerged plant communities. Ruppia brevipedunculata, a species of submerged plant, exhibits high self-pollination efficiency. Research estimating inbreeding levels and connectivity of Ruppia brevipedunculata within a large lagoon complex in Southeast Asia found different levels of inbreeding and spatially structured gene pools in natural lagoon habitats compared to aquaculture pond habitats.
FRONTIERS IN CONSERVATION SCIENCE
(2021)