Transylvanian Review of Systematical and Ecological Research Feed

Salinity-Driven Patterns in Benthic Macroinvertebrate Communities: An Environmental Management Perspective for a Coastal Lagoon

Wed, 31 Dec 2025 00:00:00 GMT

This study investigated the response of benthic macroinvertebrate communities to salinity variations along the stretch of a coastal lagoon in Nigeria. 576 samples collected using a van Veen grab of 0.1 m2 size from eight investigation stations were used for this study. Benthic macrofauna population of 177,120 m2 from 45 species was recorded. Molluscs were the main group, making up 98.43% of the population, followed by anelids, arthropods, and several other macroinvertebrate groups. Although seasonal changes had a minor effect on fauna abundance, the richness, diversity, and evenness of species were not significantly impacted. Salinity gradients played a crucial role in determining the distribution and abundance of benthic macrofauna. Locations with elevated salinity levels (> 0.34‰) exhibited greater abundance.

Analysis of the Interaction between Microplastics and Pops in Freshwater Environments ‒ An Experimental Study Under Laboratory Conditions

Wed, 31 Dec 2025 00:00:00 GMT

This study studies the interaction between persistent organic pollutants and microplastics in freshwater, aiming to identify potential correlations between their concentrations. The analysis is grounded in laboratory experiments examining the adsorption capacity of common plastic polymers (e.g., PET, PS, PP, PVC, AC, PE, and PA) for persistent organic pollutants. The research uniquely explores the synergistic behaviour of these pollutants, providing foundational knowledge for future studies focused on selective adsorption mechanisms and the fragmentation processes of contaminated plastics into microplastics.

Fish Habitat and Environmental Effects of Tidal Variation in the Lower Rhône River, Rhône River Delta, and Mediterranean Sea under Eustatic Climate Change Scenario

Wed, 31 Dec 2025 00:00:00 GMT

Warming climates induce Mediterranean Sea level rise, which is destined to have major impacts on Rhône Delta habitats, biocoenosis, and escorting biota, including fish. Based on their bioecological features, a number of fish species in the Rhône Delta will be affected by such sea level rise. Others will adapt and positive ecological feedback loops may fuel further changes. Sea level variation was and is likely to be one of the key stress factors for fish in the Rhône Delta.

Effect of Diurnal Tides on the Water Quality Parameters of a Coastal River Connected with the Bay of Bengal

Wed, 31 Dec 2025 00:00:00 GMT

To study water quality changes and tidal effects, hourly samples were collected on 17-18 June 2022, in the Andharmanik River, Bangladesh. Parameters measured included temperature (28.8-30.6 °C), salinity, dissolved oxygen (5.9-6.33 mg/L), pH (7.15-7.98), TDS, conductivity, alkalinity, and hardness. Temperature, DO, and pH showed minimal correlation with water height, while salinity peaked at low tide due to evaporation and no freshwater inflow. Strong correlations were between TDS and conductivity, and water height and several parameters. Most measurements varied with the tide, offering a key baseline data for the region.

The Potential Toxic Effects of Ceftriaxone and Polypropylene Microplastics on Danio Rerio (Hamilton, 1822) Behaviour

Wed, 31 Dec 2025 00:00:00 GMT

The literature contains numerous studies on the individual effects of microplastics and pharmaceuticals that reach aquatic systems through various pathways. However, there are few studies that evaluate their combined effects. Ceftriaxone (CEF) and polypropylene (PP) are emerging pollutants found in the aquatic environment. The aim of the study was to evaluate the effects of ceftriaxone (50 µg L−1) and polypropylene (2 mg L−1) (individually and in mixture) on the behaviour of Danio rerio. The exposure to microplastics and antibiotics, alone or combined, differentially affect Danio rerio exploratory and social behaviours, with combined exposure potentially exacerbating behavioural alterations.

The Fish Fauna of the Lesser Zab River (Tigris River System) with Five First Records, and Note on Climate Change and Anthropogenic Effects on Fish Diversity in Zab River Basin (Pyransaher, Iran)

Fri, 12 Dec 2025 00:00:00 GMT

The aim of this study is to describe the biodiversity and current status of ichthyofauna in the Lesser Zab River. Through the examination of more than 1,500 samples collected from various river stations between May and August 2014 and June and August 2016, 35 fish species belonging to six families have been identified. The fish identified belong to the orders Cypriniformes, Siluriformes, and Synbranchiformes, which include Cyprinidae, Balitoridae, Sisoridae, and Mastasembelidae. Both meristic and morphological analyses were conducted on the specimens. Some of these species are reported for the first time in this part of the Zab River. Additionally, the study mentions the effects of anthropogenic and climate changes on fish biodiversity in this basin.

The Cyanobacteria, Green and Euglenoid Algae in the High Mountain Lakes of Kaçkar Protected Area (Rize, Turkey)

Fri, 12 Dec 2025 00:00:00 GMT

Floras of cyanobacteria, chlorophytes and euglenozoa of 14 glacial lakes and a pond in the Kaçkar Mountains National Park collected on 19 July, 28 August and 10 September 2020 comprised 66 species. Cyanobacteria were predominant (46.96%), Nostoc (Cyanobacteria) and Trachelomonas (Euglenozoa) were the most abundant. Physicochemical analysis and bioindicator species indicate that the studied waters are fresh, with low salinity and near-neutral or low-alkaline pH and are not polluted with organic matter. Statistical analysis of the data showed that algal and cyanobacterial floras are individual in geographically defined habitats.

Multitask Learning with Statistical Parametrization for Ecohydrological Analysis

Fri, 12 Dec 2025 00:00:00 GMT

This paper proposes a novel multi-task statistical learning framework which aims to concurrently address all the environmental challenges in the Alps. The goal is to analyse the effects of lichen and fog on water balance. The objective is the analysis of water balance mechanisms by investigating the contribution of fog and the role of forest age in the water cycle. The methods include advanced multitask learning with statistical modelling techniques. The results shown that interception plays a dominant role in the precipitation and evapotranspiration partitioning, enhanced by lichens. Trees transpiration as lower in the young stand and the evapotranspiration of soil and understory contributed considerably to the water balance at both stands. Moreover, fog caused additional throughfall in mixed fog and rain precipitation.

Information on Climate Change Impact: Accessibility and Fish Farmer’s Perception in Kumbotso Local Government Area of Kano State (Nigeria)

Fri, 12 Dec 2025 00:00:00 GMT

This study assessed fish farmers’ access to information and perceptions on climate change in Kumbotso Local Government Area, Nigeria, using purposive sampling and descriptive statistics. Most respondents were young men (84%) under 35, with tertiary studies (40%). While 62.5% were aware of climate change, only 41.7% had strong knowledge of adaptation strategies, and 29.1% were aware of policies. Key challenges included temperature changes (62.5%) and water scarcity (66.7%). Adaptation measures like species diversification (77.1%) and climate-resilient feeds (62.5%) were common, though sustainable practices were underutilized (18.8%). Improved accessibility to information and resources are needed.

Nera River (Danube Watershed) Fish Fauna Dynamic Over One Century

Fri, 12 Dec 2025 00:00:00 GMT

The ichthyofauna of the Nera River is shaped by the adaptation and evolution of fish fauna to the local highly variable relief of this river watershed. In the last half century, in some aspects, it was moderately influenced by the human activities’ impact over time in different degrees, but also by the sectors in a good ecological status, which can be considered as sanctuaries for important ecological and economic fish species. Also, climate change can be added as another driver. This research almost doubled the number of known fish species in this area.

Causal Effect of Hydro-Ecological Attributes on Spatio-Temporal Distribution of Abiotic and Biotic Factors of Meghna River Basin (Bangladesh)

Fri, 12 Dec 2025 00:00:00 GMT

The Meghna River, vital for Bangladesh’s ecosystems and livelihoods, faces threats from urbanization, agriculture, industrialization, pollution, and climate change. This study examines the basin’s spatio-temporal dynamics, focusing on hydro-physico-chemical properties (temperature, pH, dissolved oxygen, salinity) and bio-resources (phytoplankton, zooplankton, and benthic macroinvertebrates). Field surveys, laboratory analyses, and satellite imagery revealed consistent patterns, highlighting the ecosystem’s vulnerability and the urgent need for conservation strategies to sustain ecological balance and livelihoods.

Assessment of Growth Performance, Feed Utilization and Survival of Kursha, Labeo Dero Fry in Aquarium with Different Stocking Density

Fri, 12 Dec 2025 00:00:00 GMT

Approximately, 0.36 ± 0.10 g weight of kursha, Labeo dero (Hamilton, 1822) fry were stocked in aquaria and fed with commercial feed for 45 days to evaluate the effect of different stocking densities on growth performance, feed utilization, and survival. Three different treatment with the stocking density was maintained at 1 fry L−1 (T1), 1.5 fry L−1 (T2) and 2 fry L−1 (T3) respectively with having three replicates. The survival rate of all treatments was found to be above 90%. After 45 days of rearing period, growth performances (mean weight gain, SGR) and feed utilization parameters (FCR, PER) was found significantly (p < 0.05) better in T2 followed by T1 and T3.

Species Abundance and Richness Patterns of Wintering Waterbirds in Sétif Wetlands Complex (Algeria)

Fri, 02 May 2025 00:00:00 GMT

Surveys of wintering waterbirds were conducted in 17 wetland areas along the wetland complex of the Sétif region, with the aim to determine the variability of waterbird populations and the ornithological value of these wetlands for further strengthening of their management and conservation. Our survey revealed a total species richness of 47 waterbird species. The total regional population averages 31921 individuals per year recorded from 2014 to 2021. Among these species, 12 are dominant representing 94%. Based on the calculated occurrence index for each species, the population consists of two common species, 10 frequent species, and 35 rare species. The Kruskal-Wallis test (also referred to as one-way ANOVA) was utilized to compare the distribution of data series related to species richness, average abundance, and values of Shannon diversity and evenness among the different studied sites, showing highly significant differences between the wetlands.

On The Behavior of Mallard Anas Platyrhynchos in the Lake of Birds (El-Tarf Province ‒ Northeast Algeria)

Fri, 02 May 2025 00:00:00 GMT

This research show the daily behavior of the Mallard in Lac des Oiseaux. The study was conducted over three consecutive years (2020, 2021, 2022) (morning and afternoon). The variation in the number of Mallard individuals did not follow a time-series trend, with the peak number of individuals observed in November-December. Foraging dominated the diurnal time budget of this duck. The proportion of each activity differed significantly between the morning and afternoon periods, except for flying activity. Energetic activities were positively correlated and observed during both the morning and afternoon. Wetland management should incorporate behavior of the species in order to ensure effective conservation strategies.

Invasive Aquatic Plants as Stressors of Freshwater Aquatic Ecosystems

Fri, 02 May 2025 00:00:00 GMT

This paper documents the different ways in which invasive alien species are introduced into new areas. The pathways by which invasive alien species spread, their history, and the characteristics of plants that enable them to spread successfully are described. The article discusses the competitive abilities of invasive alien species, their negative effects on other organisms, and the impact of global change on their spread.

Distribution of Common Chub, Common Dace and Roach Across Environmental Gradients on the East Edge of Europe

Fri, 02 May 2025 00:00:00 GMT

The probability of occurrence, optimums, niche breadth, and distribution of three fish species in 559 small rivers on the eastern edge of Europe were studied. Roach was the most abundant species, while common chub was the most frequent by occurrence. The probability of occurrence of common chub, common dace, and roach differs significantly between our studies in the extreme east of Europe and those in river basins in the west of the continent. Cohabitation of all three species was noted in 13.1% of rivers. The highest percentage (22.9%) of cohabited fish was observed for chub and dace. Elevation and river depth were the main environmental factors influencing the distribution of all the selected fish species. Our research on the eastern edge of Europe shows that fish niche widths can vary significantly between species for some environmental factors, while being similar for others.

Estimation of the Fecundity of Threatened Chagunius Chagunio from Atrai River (Dinajpur, Bangladesh)

Fri, 02 May 2025 00:00:00 GMT

An investigation was carried out to assess the fecundity of Chagunius chagunio. A total of 50 gravid females were collected and then divided into various groups of length and weight, respectively. The fecundity ranged from 1,038 to 22,174 with a mean value of 6,201.46 ± 4,068.25 for a corresponding length and weight of 15.2 cm to 31 cm and 35.98 g to 427.99 g respectively. The fecundity increased with the total length, body weight, and ovary weight following the equation, Y = 1,081.59X-1,6025, (r = 0.76, 0.80, 0.90). The regression line for the TL, BW, GL, and GW of the sample fishes was linear when plotted against their fecundity. The present study’s findings will help recognize the proper breeding season of Chagunius chagunio.

Land Cover Analysis in the Yangtze River Basin for Detection of Wetland Agriculture and Urban Dynamics in Wuhan Area (China)

Fri, 02 May 2025 00:00:00 GMT

This study presents environmental analysis of the Yangtze River Basin, Wuhan region of central China, performed using machine learning (ML) methods of Remote Sensing (RS) data classification. The workflow is performed using Geographic Resources Analysis Support System (GRASS) Geographic Information System (GIS) scripting software for processing Landsat images by two approaches: unsupervised clustering and supervised ML algorithms. Six Landsat images were taken biennially in autumn from 2013 to 2023 to detect wetland changes in the Wuhan area. This article demonstrates the application of ML in GIS for analysis of landscape dynamics to detect changes in riverine and lacustrine areas around the Yangtze River.

Children’s Involvement in Artisanal Fishing in Selected Fishing Communities of Badagry, Lagos (South-West Nigeria)

Fri, 02 May 2025 00:00:00 GMT

This study investigates children’s involvement in artisanal fishing in Badagry, Nigeria. Their tasks varied by age: children aged 3-5 years bailed water, 6-8 years sorted fish, 9-11 years set fishing gear, 12-14 years paddled, and 15-17 years engaged in cast netting and hook-and-line fishing. Boys were the only participants, with peak involvement in November 2020. Seasonal trends showed reduced boats and crew between September 2020 and February 2021, coinciding with an increased reliance on child labor during peak fishing months. School attendance remained low, dropping to 13.44% in December 2020 before moderately improving in early 2021.

The Trophic Spectra of Squalius Cephalus (Linnaeus, 1758) and Rhodeus Amarus (Bloch, 1782) Fish Species From Dâmbovnic River (Neajlov/Danube Basin)

Fri, 02 May 2025 00:00:00 GMT

The trophic level highlights the relation between fish and macroinvertebrates. This was achieved by qualitative and quantitative analysis of the macroinvertebrates found in the stomach contents of chub (Squalius cephalus) and European bitterling (Rhodeus amarus) living in the Dâmbovnic River, a tributary of the Neajlov River. Fish sampling was performed by electro-shocking method in the summer of 2006. Macroinvertebrates in the stomach contents were identified down to the lowest taxon possible. The analysis revealed that nearly all the specimens found in the stomach contents of the fish belong to the class Insecta. The highest values of abundance were recorded from the Order Diptera.