Threats, challenges and sustainable conservation strategies for freshwater biodiversity

Ahmed, Shams Forruque; Kumar, P. Senthil; Kabir, M.; Zuhara, Fatema Tuz; Mehjabin, Aanushka; Tasannum, Nuzaba; Hoang, Anh Tuan; Kabir, Zobaidul; Mofijur, M.

doi:10.1016/j.envres.2022.113808

Cited by 65 publications

(17 citation statements)

References 82 publications

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“…The presented research results provide a unique opportunity to analyze local variations in the morphometric variability of the indigenous species rudd S. erythrophthalmus in the conditions of the freshwater hydro-ecosystem of the Horyn River. Detailed studies of this species have not yet been carried out for this region, although in modern conditions of rapid reduction of biodiversity in freshwater rivers, studies of various fish species are important (Zhang et al, 2021;Ahmed et al, 2022;Santos et al, 2022). Studying the influence of environmental factors on the morphometry of fish helps in the restoration of fish communities and contributes to better management of the ecological state of rivers (Stoffers et al, 2022;Tsavdaridou et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Influence of hydrochemical factors on morphometric variability of Scardinius erythrophthalmus in a freshwater river system

Klymenko¹,

Gandziura

Biedunkova³

et al. 2022

Biosys. divers.

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Studying fish growth is a complex task because growth depends on many factors. The process of fish growth is influenced by ecological factors of the water environment. Each species of fish has growth characteristics and characteristic changes in this process as a result of the action of natural and anthropogenic factors. We investigated the morphometric features of Scardinius erythrophthalmus in the hydroecosystem conditions of the Horyn River. Fish were caught by amateur fishing methods during 2018–2021 in the section of the hydrographic system of the Horyn River within the Rivne Plateau, which is the northern part of the Volhynian Upland , namely the Horyn River and its tributaries – the Zamchysko River, the Ustia River, and the Stubelka River. The catches included fish aged from 0+ (one-year-olds) to 5+ (five-year-olds). Growth variability was studied for fish aged 1+ to 4+ because their numbers were sufficient for statistical evaluation. We noticed clear features of the morphometric variability of the fish. According to the coefficient of variation for the general populations of S. erythrophthalmus from different rivers, there was mostly significant variability of such growth characteristics as the largest and smallest fish body height, total length, Smith length and short body length of fish. We also noticed the similarity of the morphometric variability of fish of different ages for the Horyn River and Stubelka River and Zamchisko River and Ustia River. The analysis and evaluation of the surface water quality of these rivers was also similar. Thus, Horyn and Stubla districts had a transitional state from II to III quality class, and the Zamchysko River and Ustya River districts had a transitional state from III to IV quality class. We conducted a multivariate regression and it revealed statistical significance and a close correlation between the coefficients of variation of the growth characteristics of fish with the phosphate content in the water (with an average value of the weighting coefficients of 0.50 ± 0.06), nitrite nitrogen (0.39 ± 0.10) and nitrate nitrogen (0.84 ± 0.34). The calculation of the specific growth of fish by full length revealed that the intensity of growth is the highest between the first and second year of life of fish for small rivers (Zamchysko River, Ustya River, Stubelka River) and between the second and third year for the Horyn River. The results presented in the article are valuable and describe the local variation in the morphometric variability of S. erythrophthalmus. This expanded the understanding of the influence of ecological factors of the aquatic environment on the formation of growth characteristics of this species of fish. In the future, our research will continue and study the linear growth of natural fish populations against the background of changes in the ecological and hydrological conditions of the studied region

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Section: Discussionmentioning

confidence: 99%

Influence of hydrochemical factors on morphometric variability of Scardinius erythrophthalmus in a freshwater river system

Klymenko¹,

Gandziura

Biedunkova³

et al. 2022

Biosys. divers.

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“…The increasing human impacts on freshwater ecosystems have degraded and fragmented aquatic habitats (Baras & Lucas, 2001; Dudgeon et al, 2006; Grill et al, 2019), resulting in a steep decline in fish populations worldwide (Maitland, 1995; WWF, 2022). Still, riverine fish continuously face growing threats from various stressors (Ahmed et al, 2022; Dudgeon et al, 2006; Reid et al, 2019), including climate change, excessive water pollution, and further development of hydropower as part of expanding renewable energies (e.g., EU Renewable Energy Directive 2018/2001; Quaranta et al, 2022). Even though hydropower is widely regarded as being ‘green’, sustainable, and environmentally friendly (Alfredsen et al, 2022; IHA, 2022; Singh & Singal, 2017), this renewable energy source constitutes a key stressor to fish populations (Parasiewicz et al, 1998; Schmutz et al, 2015, 2023; van Treeck et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Variation in hydropeaking‐induced stranding of Barbus barbus L. and Chondrostoma nasus L. larvae: Assessing the impact of daytime and down‐ramping rates

Führer,

Auer,

Coudrais‐Duhamel

et al. 2024

Ecohydrology

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Unnatural changes in river flow patterns resulting from peak‐operating hydropower plants adversely impact freshwater ecosystems. In particular, the rapid dewatering of shoreline habitats during artificial flow down‐ramping puts early fish life stages at a high risk of becoming stranded if they fail to follow receding water levels in time. While extensive research has been conducted on the effects of hydropeaking on salmonid species, there is limited knowledge on the diverse cyprinid family, particularly on vulnerable early life stages. Hence, this study aims to compare the larval stranding of two cyprinid species, the common barbel (Barbus barbus L.) and common nase (Chondrostoma nasus L.), in response to bank dewatering. We conducted larvae experiments in near‐natural mesocosms, simulating single flow down‐ramping events with varying down‐ramping rates (0.3–1.8 cm·min−1) during the day and at night to quantify stranding rates, also including water temperature and fish development. Our results reveal distinct diurnal patterns for both species, with higher stranding rates during the night than during the day in all experimental scenarios. The data also show higher stranding rates at faster down‐ramping, with interaction effects between down‐ramping rates and time of day. The stranding rates between the two species are similar across most of the scenarios. Scenarios with colder water temperatures show that nase larvae tend to strand more frequently than with warmer temperatures. In conclusion, the study results contribute to the ongoing discourse on hydropeaking mitigation by providing new perspectives on flow‐reduction effects on early cyprinid life stages. Mitigation measures should prioritize the periods during early larval development and factor in prevailing water temperatures. Lowering down‐ramping rates, especially during nighttime, will help minimizing negative impacts on aquatic ecosystems, particularly when combining flow rules and habitat restoration measures.

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“…It is indispensable for plant growth, photosynthesis, energy transfer, and fertilizer synthesis [ 2 ]. However, excess nitrogen can harm aquatic ecosystems, causing eutrophication of amphibian systems and the depletion of dissolved oxygen, which could lead to the death of fish and other marine organisms [ 3 ]. In addition, nitrate leaching from soil can contaminate groundwater, which, when ingested, could cause methemoglobinemia in infants under three months [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Wastewater Nitrogen Removal and Its Recovery Processes

Zhou

Zhu

et al. 2023

IJERPH

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Discharging large amounts of domestic and industrial wastewater drastically increases the reactive nitrogen content in aquatic ecosystems, which causes severe ecological stress and biodiversity loss. This paper reviews three common types of denitrification processes, including physical, chemical, and biological processes, and mainly focuses on the membrane technology for nitrogen recovery. The applicable conditions and effects of various treatment methods, as well as the advantages, disadvantages, and influencing factors of membrane technologies, are summarized. Finally, it is proposed that developing effective combinations of different treatment methods and researching new processes with high efficiency, economy, and energy savings, such as microbial fuel cells and anaerobic osmotic membrane bioreactors, are the research and development directions of wastewater treatment processes.

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Threats, challenges and sustainable conservation strategies for freshwater biodiversity

Cited by 65 publications

References 82 publications

Influence of hydrochemical factors on morphometric variability of Scardinius erythrophthalmus in a freshwater river system

Influence of hydrochemical factors on morphometric variability of Scardinius erythrophthalmus in a freshwater river system

Variation in hydropeaking‐induced stranding of Barbus barbus L. and Chondrostoma nasus L. larvae: Assessing the impact of daytime and down‐ramping rates

A Comprehensive Review on Wastewater Nitrogen Removal and Its Recovery Processes

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