Article
Environmental Sciences
Dana Lee, Jackman C. Eschenroeder, Lee J. Baumgartner, Bunyeth Chan, Sudeep Chandra, Seila Chea, Sothearoth Chea, Chheana Chhut, Elizabeth Everest, Radong Hom, Kong Heng, Stefan Lovgren, Sinsamout Ounboundisane, Wayne Robinson, Lykheang Seat, Sobot Soth, Zeb S. Hogan
Summary: The Mekong River supports a diverse range of fish species and the livelihoods of millions of people. However, little is known about the spatial dynamics and population status of many Mekong fish species, especially megafishes. This study presents initial findings from acoustic telemetry monitoring, which provide important insights into the potential impacts that hydropower dams would have on ecologically and economically important fish species.
Article
Geosciences, Multidisciplinary
Qiuping Wang, Kai Huang, Yizheng Li, Yanling Zhang, Lei Yan, Kaihang Xu, Shaoquan Huang, Muhammad Junaid, Jun Wang
Summary: This study investigated the pollution level of microplastics (MPs) in the largest wetland park in South China, the Xijin Wetland Park. The results showed the presence of MPs in both surface water and sediment samples, with 'fiber' being the most abundant shape and '<0.05 mm' as the most common particle size. Nylon fiber, polyester, and polyethylene were the most frequently detected MPs polymers. This study provides baseline data and guidelines for controlling plastic pollution in the Xijin Wetland Park.
Article
Fisheries
Lauriane Escalle, Steven R. Hare, Tiffany Vidal, Maurice Brownjohn, Paul Hamer, Graham Pilling
Summary: This study presents novel approaches to estimate annual dFAD deployments and monitoring by individual vessels in the Western and Central Pacific Ocean purse seine fishery. The results indicate a relatively stable trend in dFAD use in the WCPO, with a higher average deployment per year but a lower number of buoys monitored per vessel compared to other oceans.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Environmental Sciences
Miao Chen, Xiaowei Jin, Yang Liu, Li Guo, Yu Ma, Changsheng Guo, Fan Wang, Jian Xu
Summary: This study investigated the impact of multiple micropollutants and other stressors on the ecosystem of the Danjiangkou Reservoir in central China. The results showed a widespread contamination of micropollutants in the reservoir, with the tributaries being the most severely affected. Pesticides and organophosphate esters were identified as the major contributors to ecological risk. Environmental variables and human activities were found to be potential threats to the aquatic ecosystem.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Esteban Avigliano, Marc Pouilly, Facundo Vargas, Jerry Penha, Natalia Silva, Julien Bouchez, Sebastian Sanchez, Alejandra V. Volpedo
Summary: This study aims to determine whether Manguruyu Zungaro jahu is a large-scale migratory species and describes its habitat use throughout ontogeny using otolith Sr isotope ratio. The results showed that the dispersal area of Z. jahu is restricted to the surroundings of the confluence of the Parana and Paraguay rivers. The fish exhibited chemical signatures compatible with those of the middle Parana, Paraguay-Pilcomayo-Bermejo, and the lower/upper Parana.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Environmental Sciences
Luke M. Bower, Brandon K. Peoples, Michele C. Eddy, Mark C. Scott
Summary: The study highlighted the importance of maintaining all components of the natural flow regime for protecting freshwater biodiversity, as all aspects of the flow regime were found to affect fish and benthic macroinvertebrate assemblages. By identifying hydrologic metrics associated with the greatest ecological responses, managers can prioritize certain metrics during environmental flow standard development. Additionally, the varying responses of aquatic organisms to hydrologic metrics across stream classifications and ecoregions emphasized the need to consider differences in flow regime and ecoregion when designing environmental flow standards.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Sara Packull-McCormick, Alicia Cowan, Ken D. Stark, Mike Low, Mary Gamberg, Heidi Swanson, Brian Laird
Summary: Indigenous communities in northern Canada rely on locally harvested traditional foods, including fish, which provides them with nutritional, cultural, and social benefits. However, mercury exposure from fish consumption can pose a health risk for populations that consume large amounts of fish with elevated mercury concentrations. This study examined mercury bioaccessibility in freshwater fish species and found significant differences in total mercury bioaccessibility among fish species and lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Fisheries
A. K. Bera, B. K. Das, D. Mohanty, N. Chakraborty, S. Dey, R. C. Malick, R. K. Manna, P. Majhi, Lianthuamluaia, T. Tayung, H. S. Swain, A. K. Sahoo, H. Chowdhury, U. K. Sarkar
Summary: This study investigated a mass mortality of fishes in a small tropical reservoir in Odisha, India, potentially caused by environmental factors and diseases. In experimental challenges, isolated bacteria showed pathogenicity in respective hosts, similar to the situation in the reservoir.
Article
Environmental Sciences
Giuseppina Forgione, Francesco Izzo, Mariano Mercurio, Domenico Cicchella, Luciana Dini, Gabriele Giancane, Marina Paolucci
Summary: In this study, the researchers examined the presence and abundance of microplastics in the gastrointestinal tract of freshwater fish in Southern Italy. They also investigated the correlation between microplastics and environmental pollutants. The results showed that microplastics were present in the fish samples, with different species and polymers identified. Additionally, a significant correlation was found between microplastics and certain pollutants, such as polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs).
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Rikho Jerikho, Surya Gentha Akmal, Veryl Hasan, Yonvitner, Jindrich Novak, Andre Lincoln Barroso Magalhaes, Alberto F. Maceda-Veiga, Michael L. Tlusty, Andrew Rhyne, Ondrej Slavik, Jiri Patoka
Summary: The pet trade serves as an important pathway for the introduction of aquatic non-native species, with Indonesia playing a significant role in this trade. A survey of the Indonesian market and aquaculture reveals the volume of trade and the customer countries involved in the import of South American river stingrays. Analysis of the climate similarities between the native range of these species and Indonesia identifies several areas suitable for their establishment, and the presence of established populations in the Brantas River confirms this. The unregulated culture of these stingrays poses a risk to wildlife, highlighted by the first recorded case of envenomation caused by Potamotrygon spp. outside of South America. Continuous monitoring and risk mitigation measures are strongly recommended.
SCIENTIFIC REPORTS
(2023)
Article
Ecology
Julia Gensel, Marc Steven Humphries, Matthias Zabel, David Sebag, Annette Hahn, Enno Schefuss
Summary: The study reveals that sedimentary organic matter from inland areas is mainly deposited in the floodplain and swamp area of the wetland system, rather than the downstream lake area. Surface sediments in the downstream Lake St Lucia show distinct characteristics of less degraded organic matter, indicating different hydrological growth conditions for the contributing vegetation. This finding has important implications for future environmental studies.
Article
Agronomy
Matthew P. Spoth, Lauren M. Schwartz-Lazaro, Gabrielle L. LaBiche, Wade E. Thomason, Kevin W. Bamber, Michael L. Flessner
Summary: This study examines the distribution of aboveground biomass and nutrient composition of straw and chaff during soybean harvest, and predicts the nutrient consequences and replacement costs of harvest weed seed control (HWSC) methods.
Article
Environmental Sciences
Mohammed Kajee, Dominic A. W. Henry, Helen F. Dallas, Charles L. Griffiths, Josephine Pegg, Dewidine Van der Colff, Dean Impson, Albert Chakona, Domitilla C. Raimondo, Nancy M. Job, Bruce R. Paxton, Martine S. Jordaan, Roger Bills, Francois Roux, Tsungai A. Zengeya, Andre Hoffman, Nick Rivers-Moore, Jeremy M. Shelton
Summary: In South Africa, anthropogenic pressures have led to widespread deterioration of river ecosystems, posing a threat to freshwater fish species. To address the lack of access to reliable biodiversity data, the Freshwater Biodiversity Information System (FBIS) was developed as a platform for accessing and sharing high-quality freshwater biodiversity data. The FBIS is being utilized to provide freshwater fish data to the National Environmental Screening Tool (NEST), which guides environmental assessments and decision-making. This integration of freshwater biodiversity data in the NEST represents an important step towards data-driven conservation and management at a national level.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Fisheries
Paula Casanovas, Seumas P. Walker, Hazel Johnston, Colin Johnston, Jane E. Symonds
Summary: Blood biochemistry and haematological parameters in fish are affected by environmental changes, stress, and health status. The study provides baseline data and reference ranges for 34 indicators in Chinook salmon, showing significant differences in some parameters between freshwater and seawater environments. Some parameters were also found to be correlated with fish size.
Article
Environmental Sciences
Tan Chen, Chunqiao Song, Chenyu Fan, Xin Gao, Kai Liu, Zhen Li, Jian Cheng, Pengfei Zhan
Summary: This study simulated the impact of environmental variables on fish catches in China's Poyang Lake using remote sensing techniques and machine learning algorithms. The findings showed that hydrometeorological conditions, water quality, and water ecological variables all have significant influences on fish catches. The integration of multiple variables can further improve the accuracy of fish catch simulation.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)