River Research Articles

Reappraisal of Goezeella Fuhrmann, 1916 (Cestoda: Proteocephalidae), parasites of Neotropical catfishes (Siluriformes), with description of a new species from Pimelodella cristata (Heptapteridae)

The cestode genus GoezeellaFuhrmann, 1916 is reviewed on the basis of taxonomic evaluation of type and newly collected material from pimelodid and heptapterid catfishes (Siluriformes) in the Amazon River basin, South America, and its generic diagnosis is amended. The genus is typified by the exclusively ventral position of the cortical vitelline follicles, the inner longitudinal musculature formed by dense individual muscle fibres, rather than forming bundles as in other proteocephalids, a well-developed metascolex and biloculate suckers. The type species, G. siluriFuhrmann, 1916, is redescribed based on its syntype from Cetopsis coecutiens (type-host) (Cetopsidae) and specimens from Pinirampus pirinampu (Pimelodidae). The validity of G. danbrooksi de Chambrier, Rego & Mariaux, 2004 from Ageneiosus pardalis (Auchenipteridae) is confirmed and some erroneous morphological traits are corrected based on examination of its holotype. A new species, Goezeella mariae sp. nov., is described from the heptapterid catfish Pimelodella cristata (Heptapteridae). The new species differs from congeners by its overall size (much smaller compared to G. siluri), morphology of the scolex (strongly wrinkled metascolex and weakly developed interlocular septum of suckers) and number of the testes. This is the third proteocephalid cestode described from a heptapterid catfish in South America and the first helminth parasite reported from P. cristata. Goezeella is unusual among other Neotropical proteocephalids by its occurrence in catfishes of as many as four families; all species of the genus are known only from the Amazon and Orinoco River basins. Molecular data on two of the three valid species and a key to their identification are provided.

On a Boulder in the River

If I were a film critic I’d be giving five stars because Voices of the Rainforest (Feld 2019b) is ethnographically brilliant. In this review, I'll pay attention to how Feld and colleagues draw our ...

Sustainable Tourism Development: A Case Study of Southern Red River Delta, Vietnam

Tourism development in general and sustainable tourism development in particular play an important role in promoting socio-economic development in most countries. This empirical study is conducted according to qualitative methods to study influencing factors such as environment, society, and economy that affect the sustainable tourism development of the South Red River Delta. The author has collected the opinions of experts, surveyed tourists, people, tourism businesses to present the scale of the above factors. On the basis of this research, future researchers can apply this method to research by quantitative methods to verify the reliability of the scale and check whether the above three factors and the variables. Whether the survey is included in each factor or there are other latent factors as well as testing the reliability of the research model. By identifying the factors, the author will expand the scope of the study further and will try to propose possible solutions that can ensure proper use of each factor to remove obstacles in the South Delta. Red River becomes a sustainable tourism destination.

Excessive-life time cancer risks due to concentration of radionuclides and quantification of contamination of sediments from dredged portion of Niger River Nigeria

Excessive-life time cancer risks due to concentration of radionuclides and quantification of contamination of sediments from dredged portion of Niger River Nigeria

Una nueva especie de lagartija del género Liolaemus (Iguania: Liolaemidae) endémica de la Puna del sur de Perú

The Andes of southern Peru contain a biodiversity with high degree of endemism due to itspeculiar geography and bioclimate. In this work a new endemic species of the genus Liolaemusis described which would be restricted to an altitude between 3870–4100 m s.n.m., in theSalado river basin of the district and province of Espinar, department of Cusco. This speciesis characterized by the unique combination of morphological characters and the color patternthat distinguish it from the rest of the species of the genus Liolaemus, mainly within of L. ortiziclade of the L. montanus group, where the new species is located according to our phylogenetichypothesis based on morphological evidence presented in this study.

Sitting in the River

Sitting in the River

Assessment of the environmental flow and habitat of the river ecosystem through ecosystem function model

Assessment of the environmental flow and habitat of the river ecosystem through ecosystem function model

Changes in Landscape Characteristics of Stream Habitats with the Construction and Operation of River-Crossing Structures in the Geum-gang River, South Korea

Changes in Landscape Characteristics of Stream Habitats with the Construction and Operation of River-Crossing Structures in the Geum-gang River, South Korea

Evaluation of the anti-microbial efficiency of scrap metal-based coagulant and local salt modified-biomaterials for point-of-use water treatment

The anti-microbial efficiency of a composite material formulated from a scrap metal-based (iron (III) sulphate) coagulant and indigenous salt (NaCl) activated biomaterials (coconut shell carbon and counter wood) were evaluated by using the composite materials as coagulant and disinfectant adsorbent by treating borehole water and river samples at point-of-use. The results of the microbial analysis of the untreated and treated ABW, FBW, ERWA, and EBRW samples revealed a 75, 75, 80, and 66.6% bacteria genera removal was obtained during rainy season while there was 100, 66.6, 80, and 100% bacteria genera removal during rainy and dry seasons, respectively. Over 500 isolates of Escherichia coli, Pseudomonas species, Salmonella species and Vibrio cholera; Pseudomonas spp., E. coli, Bacillus species and Salmonella spp.; Shigella species, E. coli, Pseudomonas spp., Salmonella spp. and Staphylococcus species; E. coli, Salmonella spp. and Pseudomonas spp. bacteria genera were identified each in the untreated ABW, FBW, ERWA and EBRW samples during the rainy season, while Bacillus spp. and Citrobacter freundi; Klebsiella pneumoniae, E. coli and Pseudomonas spp.; E. coli, Salmonella spp., Shigella spp., K. pneumonia and Staphylococcus spp.; E. coli and E. faecium bacteria genera were identified during the dry season, respectively. After treatment, 3 and 2 genera of bacteria each were present in 48 and 9 isolates during rainy and dry seasons, respectively. The means of the aerobic bacteria count (ABC) during the two seasons showed no significant variations at p Eƒ 0.05 confidence limit. Key words: Anti-microbial activity, disinfection, coagulant, activated biomaterials.

Calculation (Computation) of Habitat Suitability Index for Swimming Fish Species Living in Miho Stream in Geum River Water System

Calculation (Computation) of Habitat Suitability Index for Swimming Fish Species Living in Miho Stream in Geum River Water System

ESTIMACIÓN DE CAUDALES EN CUENCAS NO AFORADAS POR EL MODELO HIDROLÓGICO CEQUEAU

El agua es un recurso natural fundamental para la vida en la Tierra y es el componente básico del ciclo hidrológico. La evaluación de la cantidad de agua disponible en una cuenca es un requisito para el desarrollo y administración de los recursos hídricos, ya sea para suministrar agua a la población, agricultura, industria o para la producción de energía. La modelación hidrológica es una de las herramientas principales usadas para estimar caudales en cuencas no aforadas. En este estudio se aplicó el modelo hidrológico distribuido CEQUEAU para estimar los caudales en cuatro sitios no aforados de la cuenca del río Tacotalpa para el periodo de 1965 a 1999. Para la evaluación de la eficiencia del modelo se usaron tres estadísticas: el coeficiente de eficiencia de Nash-Sutcliffe (NSE), el porcentaje de sesgo (PBIAS) y el coeficiente de determinación (R2). De acuerdo con los criterios estadísticos el modelo es muy bueno. CEQUEAU realizó simulaciones con una buena respuesta natural de los escurrimientos de la cuenca.

The Relationship between Kanngiqtugaapik/Clyde River and Greenpeace: An Interview with Mayor Jerry Natanine

The Relationship between Kanngiqtugaapik/Clyde River and Greenpeace: An Interview with Mayor Jerry Natanine

Complex sandstone reservoir evaluation based on petrophysical facies classification: a case study of Huizhou Sag in the Pearl River Mouth Basin#br#

Complex sandstone reservoir evaluation based on petrophysical facies classification: a case study of Huizhou Sag in the Pearl River Mouth Basin#br#

Effect of Irrigation of River Water and Swine Slurry Liquid Fertilizer on Kenaf (Hibiscus cannabinus L.) Growth Cultivated Using Soil Moisture Control System in Reclaimed Land

Effect of Irrigation of River Water and Swine Slurry Liquid Fertilizer on Kenaf (Hibiscus cannabinus L.) Growth Cultivated Using Soil Moisture Control System in Reclaimed Land

Development of suspended solid concentration measurement technique based on multi-spectral satellite imagery in Nakdong River using machine learning model

Development of suspended solid concentration measurement technique based on multi-spectral satellite imagery in Nakdong River using machine learning model

Conceptualizing rivers as ecosystems

Conceptualizing rivers as ecosystems

Use of environmental management data for mass flow estimations of plastic debris in rivers: The Seine River and The Huveaune River, France.

Methods to quantify plastic transport in rivers have greatly improved during the past few years. As a first approach, visual counting is currently the simplest way to assess plastic transport with minimal effort and cost. It usually results in underestimations of plastic input into the sea of about one to two order of magnitude when compared to models such as the Jambeck's approach. The latter shows statistical weaknesses and data availability issues leading to large uncertainties, while visual counting miss the water column compartment and often has a low spatiotemporal representativeness. In order to give another ground-truth estimation of plastic transport able to challenge both models and visual counting, we developed innovative methods based on environmental management data in the Seine estuary (500 m3/s) and the Huveaune River ( 2 m3/s; Marseille, France). First, we used data from institutional cleaning in the Seine estuary that consist in litter collection on riverbanks. Their efficiency was measured based on capture-recapture design. Mass flows of plastic debris were then calculated based on the capture rate over one year, the estimation of the fraction of plastic debris which are never collected (hidden or too small) and the assumption that all plastic debris strand on riverbanks. Second, we used data from bar screens spaced of 3 cm in the Huveaune, a small urban river flowing in Marseille, South France. All the water column is screened, and captured waste are automatically collected in dumpsters. Grab sampling were performed after a dry, a wet and a flood period. The corresponding annual mass flows of plastic debris was then calculated relative to the mean fraction of time corresponding to those hydrological periods over 2017 and 2018. Annual mass flows of plastic debris were normalized to the population in both basins. Although methods were different, mass flows of plastic debris per capita are very similar with 8.5 - 13.6 g/cap/yr for the Seine River and 2.4 - 14.9 g/cap/yr for the Huveaune River. This is one to two order of magnitude lower than the Jambeck's approach. However, when focusing on the fraction ending into the Sea, bar screens in Marseille enable to decrease the mass flow of plastic debris of about one additional order of magnitude, while cleaning of riverbanks decreases it of about 10%. This is related to the nature of the rivers that calls for different solutions, screening the whole Seine River being a tricky idea. Nevertheless, when normalized to water volume, the Huveaune River is visually much more polluted (16.4-102.2mg/m3) than the Seine estuary (9.0-14.5 mg/m3). In onclusion, environmental management data can help to estimate mass flows of plastic debris and calls for better consideration. However, they often need an improved scientific framework.

Characteristics and environmental driving factors of water transformation in the Balaguer River watershed of Inner Mongolia steppe.

Inner Mongolian steppe is one of the ecological barriers in China. The variation of water resources is very important for the development of social-economy and the protection of eco-environment. We collected 254 water samples of precipitation, river, and shadow groundwater during wet-season and dry-season of 2018-2019 from Balaguer River watershed and meansured the physical-chemical indicators, δD and δ18O of water samples. The stable isotope technology, mathematical statistics, and the inverse distance weighting method were used to analyze the stable isotope composition, spatial-temporal variation, and impact factors. Moreover, the d-excess and the isotopic mixing ratio formula were used to analyze the conversion characteristics of different water and to identify their environment driving variables. The results showed that δD and δ18O of precipitation, river and shallow groundwater were higher in wet season than in dry season. The driving factors of different water transformation in the watershed were air temperature, altitude, and groundwater depth. Altitude was significantly negatively correlated with river δD, and the δD and δ18O of groundwater. δD and δ18O of groundwater fluctuated significantly in the area with groundwater depth less than 10 m, but were stable in other areas. There was a positive correlation between precipitation δ18O and air temperature. The d-excess in wet season was higher than that in dry season, with a decreasing distribution characteristic from southern to northern part in the study area. More than 50% river in upper stream came from precipitation, while more than half river water converted to groundwater, with different recharge-drainage relationships existed between surface water and groundwater in different river reaches.

Vegetation coverage change of the demonstration area of ecologically friendly development in the Yangtze River Delta, China based on GEE and BRT during 1984-2019.

The demonstration area of ecologically friendly development in the Yangtze River Delta is a major national strategy area, and thus eco-environmental protection should be a priority for the sustainable development. Exploring the spatial-temporal variations of franctional vegetation coverage (FVC) is conducive to accurate assessing the ecological quality of environment, which is of great significance to regional sustainable development. In this study, the characteristics and trends of spatial-temporal variation of vegetation cover during 1984-2019 in the demonstration area were analyzed based on Google Earth Engine (GEE). The effects of different ecological factors on FVC were quantified by the boosted regression tree (BRT). Results showed that,the changing trend of FVC in the study area shifted from decreasing to increasing trend from 1984 to 2019. The spatial distribution of FVC in the study area varied with both stages and regions. FVC was mainly degraded. Compared with the year 1984, the area of vegetation degradation and improvement in 2019 accounted for 49.8% and 12.8%, respectively. The vegetation degradation mainly occurred in the north of Wujiang, south of Jiashan, and northeast of Qingpu. Human activities severely weakened the influence of natural factors on FVC. Our findings suggested that the GEE is an effective tool for monitoring the dynamics of vegetation coverage.

Temporal-spatial variation and the affecting factors of protected areas in Guizhou, China.

The establishment of protected areas is the bottom line of ecological security for promoting the construction of ecological civilization and supporting economic and social development, which is an important strategy to realize sustainable development and maintain ecological security. In order to reveal the large spatial process of protected areas and its influencing factors, we used the methods of nearest neighbor index, kernel density, and standard deviational ellipse to analyze the temporal-spatial variation characteristics of the protected areas in Guizhou Province from 2002 to 2017, as well as the influencing factors combined with geo-detectors. The results showed that, during the study period, the number, area, and types of protected areas in Guizhou Province showed a diversified and rapid development, forming a protected area system with nature reserves, forest parks and scenic spots as the main body and wetland parks, geoparks and natural heritage sites as the supplement. The spatial cohesion of protected areas was strengthened, the scope of spatial distribution was expanding, and the speed of spatial movement was declining, forming a spatial pattern dominated by the northeast-southwest direction and gradually stable. The coalescence process in protected areas was strongly influenced by topography and vegetation distribution. The protected areas tended to cluster in gentle terrain around rivers and mountains and in areas of concentrated vegetation. The spatial differentiation of protected areas was jointly affected by multiple factors at different levels. The explanatory power of different factors to the spatial differentiation of protected areas was different. Among them, the normalized difference vegetation index, areas of forest and highway mileage were the common main factors affecting the spatial differentiation of the number and area of protected areas, and the explanatory power of different factors was significantly consolidated after interaction, characterized as nonlinear or bi-factor enhancement.