Aquatic Science and Technology最新文献

Effects of Vermicompost on Growth of Cyprinid Fish and Water Quality of Warm Water Earthen Ponds 蚯蚓堆肥对鲤科鱼类生长及温水土池水质的影响

Aquatic Science and Technology Pub Date : 2023-02-22 DOI: 10.52941/ast.v11i1.42

Mehran Moslemi, Gholamreza Rafiei, H. Pourbagher, Arsh Javanshir

引用次数: 0

Diversity of Large and Medium Sized Mammals and Their Challenges in Abay (Blue Nile) Gorge in the Amhara Region of Ethiopia 埃塞俄比亚阿姆哈拉地区阿贝(青尼罗河)峡谷大中型哺乳动物多样性及其挑战

Aquatic Science and Technology Pub Date : 2023-01-26 DOI: 10.52941/ast.v11i1.39

Dessalegn Taye, M. Wale

{"title":"Diversity of Large and Medium Sized Mammals and Their Challenges in Abay (Blue Nile) Gorge in the Amhara Region of Ethiopia","authors":"Dessalegn Taye, M. Wale","doi":"10.52941/ast.v11i1.39","DOIUrl":"https://doi.org/10.52941/ast.v11i1.39","url":null,"abstract":"The diversity and threats of medium and large‐sized mammals was studied in Abay (Blue Nile) Gorge, Amhara Region, Ethiopia using direct and indirect survey techniques on transect lines crossing natural forest, riverine forest and woodlands. Footprints, camera traps and group discussions were used. Data were analyzed using detrended correspondence analysis, cluster analysis, non-metric multidimensional scaling, and diversity indices. A total of 25 medium and large mammal species belonging to 6 orders and 12 families were recorded. Order Carnivora was the most abundant followed by Artiodactyla, whereas Tubulidentata, Lagomorpha and Procaviida were rare. Leopard is threatened species. The plotting of the detrended correspondence analysis between mammal species and districts showed 61% on axis 1 and 22% on axis 2 and Gozamin district stood at the left side of the plot and Andabet, Enebise Sar Midir and Borena at the extreme right, contributing to the observed association. The mammal species were found lined up along axis 1, where Lycaon pictus and Reducna redunca were closely associated to Gozamin. The cluster analysis based on the Bray-Curtis single linkage similarity index showed differences and similarities between the mammals species composition recorded in the six districts. P. anubis, C. pygerythrus, S. grimmia, O. oreotragus, G. genetta, P. pardus pardus, H. hyaena, G. sanguinea, H. brucei, P. capensis, H. cristata stood out clearly separated from the rest of them and showed linkage at almost 50% similarity. The highest similarity (at about 96% similarity) was a cluster of four species, i.e., T. sylvaticus, T.strepsiceros, S. scrofa and K. ellipsiprymnus. Non-metric multidimensional scaling also gave clusters of similar districts but not mammal species. Species diversity (H′) ranged from low (1.1) to average (1.9). Anthropogenic impacts were associated with decline in abundance of species and populations. Conservation schemes (nature reserves) need to be launched as soon as possible.","PeriodicalId":219976,"journal":{"name":"Aquatic Science and Technology","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132750588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diversity, Composition, and Abundance of Avian Species in and around SemienMecha District Wetlands North Western, Ethiopia 埃塞俄比亚西北部SemienMecha湿地及其周边鸟类的多样性、组成和丰度

Aquatic Science and Technology Pub Date : 2023-01-26 DOI: 10.52941/ast.v11i1.40

Dessalegn Taye, Edeget Merawi, G. Faris

{"title":"Diversity, Composition, and Abundance of Avian Species in and around SemienMecha District Wetlands North Western, Ethiopia","authors":"Dessalegn Taye, Edeget Merawi, G. Faris","doi":"10.52941/ast.v11i1.40","DOIUrl":"https://doi.org/10.52941/ast.v11i1.40","url":null,"abstract":"The objective of the present study was assessing the species composition, relative abundance and species diversity of avifauna found in wetlands of Semin Mecha District. The diversity, relative abundance and distribution of the avian species were investigated from January 2019 to August 2019 both wet and dry seasons. Both point count and line transect methods were employed to identify birds from the three wetlands. A total of 39 species, 28 genera 14 families and 8 orders were identified. The order Charadriiformes dominated the list (4 families with 14 species) followed by Pelecaniformes (2 families with 9 species), Gruiformes (2 families with 4 species), suliformes 2 families with 3 species), psseriformes (1 family with 6 species), the rest Accipitriformes, phoenicopteriformes and podicipediformes(1 family with 1 species) each. Out of total 39 species, one species (Black billed gull) was endangered, two species (wattled crane and Black crowned crane were vulnerable, one specie (Rouget's rail) was near threatened, and thirty five bird species recorded were under the Least Concern category. Species abundance and diversity varied between the three habitats. Weinner Simpson index showed significant diversity of birds in Koga reservoir had higher species diversity (H’=5.9) followed by kurt Bahir dembar(H’=4.15) and lower species diversity Kurt Bahir (H’=2.53).The study shows that habitat destruction due to anthropogenic activities:- over-grazing, sedimentation, poor management of catchment, recession farming, over-utilization of resources, lack of awareness , Lack of sense of ownership, giving less attention to conservation were the main threats to the survival of wetland birds in the study area. The current management of wetlands is poor because of misuse of wetlands as the result birds are endangered. Thus urgent conservation measures are recommended to conserve the bird species.","PeriodicalId":219976,"journal":{"name":"Aquatic Science and Technology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125749261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Fertilizer Regimen on Water Chemistry and Filamentous Green Algae in Earthen-Substrate Ponds 施肥方案对土基质池塘水化学及丝状绿藻的影响

Aquatic Science and Technology Pub Date : 2022-02-14 DOI: 10.52941/ast.v10i1.28

M. Ward

{"title":"The Influence of Fertilizer Regimen on Water Chemistry and Filamentous Green Algae in Earthen-Substrate Ponds","authors":"M. Ward","doi":"10.52941/ast.v10i1.28","DOIUrl":"https://doi.org/10.52941/ast.v10i1.28","url":null,"abstract":"Water chemistry patterns can be indicative of production potential during pond culture of walleye (Sander vitreus, ≈30 mm total length). However, achieving desired water chemistry patterns that reflect an increase in zooplankton, a reduction in phytoplankton, and a lack of nuisance filamentous green algae in large, earthen-substrate ponds can be challenging. During 2020, water chemistry variables and the occurrence of filamentous green algae were compared in fishless, earthen-substrate ponds (0.72 ha) that received either alfalfa meal (AFM, n=2) or alfalfa meal combined with inorganic nitrogen (AFM+28:0:0, n=2) over an approximate 30-day period. Alfalfa meal use was standard across all ponds (476 kg), while the concentration of inorganic nitrogen (ammonia-N + nitrate-N) was initially raised to 1.25 mg/L with subsequent applications, at three to five-day intervals, having a target concentration of 0.64 mg/L. Initial pH and dissolved oxygen were significantly higher, but pH became significantly lower over time in the AFM+28:0:0 treatment. Ammonia-nitrogen began similarly low (<0.1 mg/L) in both treatments but became and remained significantly higher (peaked 0.44 mg/L on June 9) with 28:0:0 supplementation. Nuisance, filamentous green algae were not observed with 28:0:0 supplementation but were present on the substrate of both ponds in the AFM treatment. Supplementing an alfalfa meal regimen with inorganic nitrogen every three to five days in earthen-substrate ponds deterred filamentous green algae and promoted water chemistry indicative of enhanced walleye fingerling production in previous trials.","PeriodicalId":219976,"journal":{"name":"Aquatic Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129276395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluate the Effect of Using Source of Nitrogen (Soaked Brown Lentils) on Chemical Composition for Marine Microalgae Nannochlorpsis oceanica 不同氮源(浸泡褐扁豆)对海洋微藻化学成分的影响

Aquatic Science and Technology Pub Date : 2021-09-08 DOI: 10.52941/ast.v10i1.19

Ali M. Abugrara

引用次数: 0

Reviewer Acknowledgements 审核人确认

Aquatic Science and Technology Pub Date : 2020-12-29 DOI: 10.5296/ast.v9i1.18121

Maggie Liu

引用次数: 0

Priority Areas for Water Resources Conservation: Study Case Canal Guandu Watershed 水资源保护优先区域——以运河官渡流域为例

Aquatic Science and Technology Pub Date : 2020-09-24 DOI: 10.5296/AST.V9I1.17502

J. Vieira, H. Pinheiro, Mateus Marques Bueno, W. C. Junior, N. R. Pereira, Daniel Costa de Carvalho, Paula Soares

引用次数: 0

Influence of Particle and Grain Size on Sand Filtration: Effect on Head Loss and Turbidity 颗粒和粒度对砂过滤的影响:对水头损失和浊度的影响

Aquatic Science and Technology Pub Date : 2020-08-11 DOI: 10.5296/ast.v8i2.17512

Racha Medjda Bouchenak Khelladi, Abdelghani Chiboub Fellah, M. Pontie, Fatima Zohra Guellil

{"title":"Influence of Particle and Grain Size on Sand Filtration: Effect on Head Loss and Turbidity","authors":"Racha Medjda Bouchenak Khelladi, Abdelghani Chiboub Fellah, M. Pontie, Fatima Zohra Guellil","doi":"10.5296/ast.v8i2.17512","DOIUrl":"https://doi.org/10.5296/ast.v8i2.17512","url":null,"abstract":"Sand filtration is an eco-friendly method to treat either drinking water or wastewater ; it requires only natural granular media. It is also easy to use and to maintain ; the only problem they face is clogging that affects filter performance, that can be detected when head loss or turbidity increase. The purpose of this work is to see what are the factors that influence the performance of filter operation, for this, we used a pilot consisting on a circular column filled with sand (from South Algeria), where various parameters were tested; pressure, flow rate, sand granulometry, suspended matters and particle concentration of the water which is filtered. After eighteen weeks of operation, we have found that head loss increases by decreasing granulometry and increasing flow rate, pressure, particle size, and concentration. However, turbidity increases by decreasing particle size and increasing granulometry and particle concentration. Turbidity and head loss have different behaviour towards the same parameter; that is why it is necessary to take them into account in order to find a compromise between acceptable head loss / turbidity for a good functioning of the filter.","PeriodicalId":219976,"journal":{"name":"Aquatic Science and Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115443949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Wastewater Treatment of Mariout Lake Drains Using Combined Physical, Chemical, and Biological Methods in Microcosm Experiments 物理、化学和生物相结合的方法处理Mariout湖排水的微观实验

Aquatic Science and Technology Pub Date : 2019-06-03 DOI: 10.5296/AST.V7I2.14651

Hermine R.Z. Tadros, S. Hamdona, M. Ghobrial, Mona F. El-Naggar, Omayma H Abd El-Hamid

{"title":"Wastewater Treatment of Mariout Lake Drains Using Combined Physical, Chemical, and Biological Methods in Microcosm Experiments","authors":"Hermine R.Z. Tadros, S. Hamdona, M. Ghobrial, Mona F. El-Naggar, Omayma H Abd El-Hamid","doi":"10.5296/AST.V7I2.14651","DOIUrl":"https://doi.org/10.5296/AST.V7I2.14651","url":null,"abstract":"The treatment of wastewater is a must due to the decrease of clean water and the increase in the consumption of fresh water for domestic uses. This study discusses the physical, chemical, and biological treatments of water from different types of Mariout Lake drains. It also aims at a designation of appropriate wastewater treatment process for sewage water (El-Qalah drain), agriculture water (El-Umoum drain), and raw drinking water before treatment (Nubareya canal) so as to adopt an appropriate procedure to be applied as the drains discharge their wastewaters in Mariout Lake affecting its water quality as well as its fish productivity. Obtaining secure effluents for discharge in natural water bodies (El-Mex bay), or using treated effluents in agriculture or industrial purposes, is a target too, open for estimation. Alum, aeration beside two natural medicinal plants, piper nigrum (Black Pepper) and dry ginger (Zingiber officinalis), and the eukaryotic microorganism yeast, were used for treatment, in addition to the freshwater submerged macrophyte Ceratophyllum demersum.The results of the physicochemical parameters revealed that the best material for treatment in El-Qalaa sewage drain was by Alum + Aeration + Ginger + Ceratophylum demersum.The most preferable material for both the raw drinking water of Nubareya canal and El-Umoum agricultural wastewater was Alum + Aeration + Yeast + Ceratophylum demersum.Regarding the four trace metals' (Zn, Pb, Fe, and Cu) concentration treatments, the best treatment in all cases was found to be Alum + Aeration + Yeast + Ceratophylum demersum, except for Zn in El-Qalaa sewage water which had to be treated by Alum + Aeration + Ginger + Ceratophylum demersum.","PeriodicalId":219976,"journal":{"name":"Aquatic Science and Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122871474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Alteration of Feeding and Filtering Rates of Two Species of Marine Copepods Exposed to Different pH Levels 两种海洋桡足类在不同pH环境下摄食和过滤速率的变化

Aquatic Science and Technology Pub Date : 2019-05-20 DOI: 10.5296/AST.V7I2.14738

Yanqun Wang, Boyuan Wang, Z. Xue, Liyan Zhu

引用次数: 2