Chemical composition of the small rivers of the north-western part of Lake Tanganyika

1999 ◽  
pp. 75-80 ◽  
Author(s):  
S. Kimbadi ◽  
A. Vandelannoote ◽  
H. Deelstra ◽  
M. Mbemba ◽  
F. Ollevier
Keyword(s):  
Chemical Composition ◽  
Lake Tanganyika ◽  
Small Rivers ◽  
The North ◽  
North Western

scholarly journals Species composition of algae small rivers of the North-Western Black Sea region

Algologia ◽  
2020 ◽  
Vol 30 (4) ◽  
pp. 406-420
Author(s):  
O.M. Mironyuk ◽  
◽  
F.P. Tkachenko ◽  
Keyword(s):  
Black Sea ◽  
Rare Species ◽  
Floristic Composition ◽  
Hydrological Regime ◽  
Small Rivers ◽  
Taxonomic Structure ◽  
Black Sea Region ◽  
The North ◽  
Short Period ◽  
North Western

The article presents the results of research on the species diversity of algae of small steppe rivers of the north-western Black Sea coast (NWBS). These are the rivers of Kohylnyk, Chaha, Sarata, Hadjider, Kuchurhan, Yahorlyk, Baraboy, Veliky Kuyalnik, Maly Kuyalnik, Kodyma, Tylihul, Tsarehol, Chichikleya. A total of 329 species (340 infraspecific taxa) of algae belonging to 8 divisions (Bacillariophyta, Cyanobacteria, Chlorophyta, Euglenozoa, Ochrophyta, Charophyta, Dinophyta and Rhodophyta) were identified. The basis of the taxonomic structure of reservoirs are representatives of Bacillariophyta (40%), Cyanobacteria and Chlorophyta (17% each), Charophyta (10.5%), Euglenozoa (10.2%). The total share of other departments is 4.1%. The Tylihul River had the most diverse composition of algae. It is one of the largest small rivers in the region, which dries up every year for a short period. According to the Sørensen-Chekanovsky coefficient, the greatest degree of similarity of the floristic composition of algae was established by pairwise comparison of the rivers of Sarata–Kohylnyk (0.614), Sarata–Hadjider (0.544), and Kohylnyk–Hadjider (0.517). These reservoirs are located in the Danube–Dniester interfluve, have almost the same mineralization and a similar hydrological regime. Among the identified algae species, only 12 are common to all studied rivers. New records for the NWBS were Peranema pleururum Skuja, Phacus platyaulax Pochmann, Monomorphina pyrum (Ehrenberg) Mereschkowsky and Euglena van-goori Deflandre. A rare species Spirulina flavovirens Wisl. was found in in the Kohylnyk River. Anabaena bergii Ostenfeld, Phacus alatus G.A.Klebs, Monomorphina pyrum, Pleurosira laevis (Ehrenberg) Compère, Campylodiscus bicostatus Smith ex Roper, Closterium dianae Ehrenb. ex Ralfs and Batrachospermum gelatinosum (Linnaeus) De Candolle are regionally rare species. In the ecological aspect, the waters of the studied small rivers can be characterized as brackish, poorly flowing, and alkaline. According to the level of organic pollution, they correspond to the β-mesosaprobic zone.

scholarly journals Determination of the Toxicological Risk of Urban Waste from the City of Uvira Dumped into the North-Western Coast in Lake Tanganyika (Democratic Republic of Congo)

2021 ◽  
Vol 12 (10) ◽  
pp. 677-693
Author(s):  
Lumami Kapepula Vercus ◽  
Théophile Ndikumana ◽  
Njoyim Estella Buleng Tamungang ◽  
Musibono Dieu-Donné ◽  
Lukusa Mbaya Alain ◽  
...  
Keyword(s):  
Lake Tanganyika ◽  
Democratic Republic ◽  
Democratic Republic Of Congo ◽  
Western Coast ◽  
Urban Waste ◽  
The North ◽  
Toxicological Risk ◽  
The City ◽  
North Western

Anandite, a new barium iron silicate from Wilagedera, North Western Province, Ceylon

1967 ◽  
Vol 36 (277) ◽  
pp. 1-4 ◽  
Author(s):  
D. B. Pattiaratchi ◽  
Esko Saari ◽  
Th. G. Sahama
Keyword(s):  
Chemical Composition ◽  
Iron Ore ◽  
Iron Silicate ◽  
Space Group ◽  
Magnetite Ore ◽  
Western Province ◽  
The North ◽  
Ore Body ◽  
North Western ◽  
Simplified Formula

SummaryAnandite is a new barium iron silicate found in the magnetite ore zone of the Wilagedera iron ore body, in the North Western Province of Ceylon. The mineral is named after the late Dr. Ananda Coomaraswamy, the first director of the Mineral Survey of Ceylon.Anandite is monoclinic, with a 5·412, b 9·434, c 19·953 Å, β 94° 52′, space group C2/c. D 3·94, hardness 3–4. Optically positive, b ‖ β, γ ∧ a 12°, β 1·855, γ > 1·88. Pleochroism: β green, γ brown. Chemical composition corresponds to the simplified formula (Ba,K) (Fe,Mg)a (Si,Al,Fe)4O10 (O,OH)2 with Z = 2. The data available indicate that the mineral has the trioctahedral structure of the brittle micas.

Geographic variation in Neolamprologus niger (Poll, 1956) (Perciformes: Cichlidae) from Lake Tanganyika (Africa)

Zootaxa ◽  
2008 ◽  
Vol 1857 (1) ◽  
pp. 21 ◽  
Author(s):  
SARAH RISCH ◽  
JOS SNOEKS
Keyword(s):  
Geographic Variation ◽  
Morphological Variation ◽  
Geographical Variation ◽  
Lake Tanganyika ◽  
The North ◽  
Taxonomic Research ◽  
Group A ◽  
African Cichlids ◽  
Intraspecific Morphological Variation ◽  
North Western

Intraspecific morphological variation in Neolamprologus niger from seven localities along the north-western shoreline of Lake Tanganyika (Luhanga, Bemba, Ubwari West, Ubwari East, Yungu, Kabimba and Kalemie) was investigated. As a result of geographical variation, the populations could be categorized into a northern, a central and a southern group. A clear clinal pattern was found for several meristics and measurements. The lack of knowledge on the geographical variation in African cichlids and its implication for further taxonomic research is discussed.

scholarly journals A Recent Inventory of the Fishes of the North-Western and Central Western Coast of Lake Tanganyika (Democratic Republic Congo)

2011 ◽  
Vol 41 (3) ◽  
pp. 201-214 ◽  
Author(s):  
Maarten Van Steenberge ◽  
Maarten P.M. Vanhove ◽  
Donatien Muzumani Risasi ◽  
Théophile Mulimbwa N'Sibula ◽  
Fidel Muterezi Bukinga ◽  
...  
Keyword(s):  
Lake Tanganyika ◽  
Democratic Republic ◽  
Western Coast ◽  
The North ◽  
North Western

scholarly journals Engineering and geological conditions of the north-western territory of Makhachkala due to flooding

2021 ◽  
pp. 45-54
Author(s):  
В.М. Кондаков ◽  
С.А. Мамаев ◽  
М.А. Мусаев ◽  
А.С. Мамаев
Keyword(s):  
Chemical Composition ◽  
Environmental Consequences ◽  
The North ◽  
Hydrogeological Parameters ◽  
Western Area ◽  
Geological Conditions ◽  
Caspian Lowland ◽  
Horizontal Type ◽  
North Western

Определение геоморфологических и геологических условий северо-западной площади г. Махачкалы, включая Новолакский район (Новострой), в связи с процессами засоления, осолонцевания и подтопления сельскохозяйственных земель. В настоящее время город интенсивно расширяется во все стороны. Особенно актуально изучение северо-западной территории г. Махачкалы в связи с подтоплением. Район относится к Прикаспийской низменности с отрицательными отметками рельефа. Отсутствие исследований по указанным проблемам может привести к нежелательным материальным и экологическим последствиям. В связи с подтоплением изменяются и несущие способности грунтов. Изменяются сейсмоакустические свойства грунтов, т.е. скорости распространения продольных (Vp) и поперечных (Vs) волн, а также соответствующие коэффициенты и декременты их поглощения. Цель работы. Определить границы слабо дренированных и весьма слабо дренированных зон, которые выявляют барражные участки территории, и гидрогеологические районы в зависимости от водопроводимости составных верхней и нижней толщ грунтов. Методы исследований. Сбор базы данных инженерно-геологических изысканий по химическому составу грунтовых вод и литологии покровных толщ грунтов. Сбор гидрогеологических параметров разных типов грунтов и гранулометрического состава песков целью интерпретации их фильтрационных свойств. Определение уклона рельефа местности с целью выявления зон дренированности территории. Результаты работы. Представлены таблицы химического состава грунтовых вод по 19-ти объектам и гидрогеологических условий площади по данным инженерно-геологических изысканий по 39-ти объектам, в том числе глубины залегания грунтовых вод, типа грунтов по сейсмичности, глубины залегания коренных пород, трех таксонов гидрогеологических районов, уклонов рельефа. Для выделенных гидрогеологических районов: для ГР-1 рекомендуется горизонтальный тип дренажа, для ГР-2 – вертикальный или комбинированный типы дренажа, для ГР-3 – подземный дренаж не эффективен. Указано о необходимости сейсмического микрорайонирования не только исследованного района, но и всего города Махачкалы, с перспективой дальнейшей застройки. Determination of the geomorphological and geological conditions of the north-western area of Makhachkala, including the Novolaksky district (Novostroy), in connection with the processes of salinization, alkalinization and flooding of agricultural lands. Currently, the city is intensively expanding in all directions. Particularly interesting is the study area of ​​the northwestern territory of Makhachkala due to flooding. It belongs to the Caspian lowland with negative relief marks. Lack of research on these problems can lead to undesirable material and environmental consequences. Due to flooding, the bearing capacity of the soil also changes. The seismoacoustic properties of soils change, i.e. the velocities of propagation of longitudinal (Vp) and transverse (Vs) waves, as well as the corresponding coefficients and decrements of their absorption. Aim.Determine the boundaries of poorly drained and very poorly drained zones, which reveal barrage areas of the territory, and hydrogeological areas, depending on the water permeability of the composite upper and lower soil strata. Methods. Collecting a database of geotechnical surveys on the chemical composition of groundwater and lithology of cover layers of soils. Collecting hydrogeological parameters of different types of soils and granulometric composition of sands in order to interpret their filtration properties. Determination of the slope of the terrain in order to identify the drainage zones of the territory. Results.Presented are tables of the chemical composition of groundwater for 19 objects and hydrogeological conditions of the area according to engineering and geological surveys for 39 objects, including the depth of groundwater, the type of soil in terms of seismicity, the depth of bedrock, three taxa of hydrogeological regions, slopes of the relief. For the selected hydrogeological regions: GR-1 - a horizontal type of drainage is recommended, for GR-2 - vertical or combined types of drainage, for GR-3 - underground drainage is not effective. It is indicated that it is necessary to seismic microzoning not only of the investigated area, but of the entire city of Makhachkala with the prospect of further development.

scholarly journals On the Identification of Pebble Material Sources of Paleo-Rivers

2021 ◽  
Vol 20 (3) ◽  
pp. 213-221
Author(s):  
I.Y. Ilaltdinov ◽  
◽  
B.M. Osovetsky ◽  
Keyword(s):  
Chemical Composition ◽  
Flow Direction ◽  
Source Rocks ◽  
Western Slope ◽  
South Urals ◽  
Middle Urals ◽  
Sandy Gravel ◽  
The North ◽  
Material Sources ◽  
North Western

The chemical composition of chromespinelides in the Permian sandy-gravel deposits of the western slope of the Urals was investigated by microprobe analysis. The correlation of minals is used for identification of source rocks for these sediments. They were originated by the river of the Permian age, which had the north-western flow direction and were eroded of chromite-bearing massive in the South Urals. Some details of chromites chemical composition pointed to the influence of another source rocks (for instance, Saranovskiy Massive in the Middle Urals).

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