Consulta: subjectFacets:"Anthropogenic factors"
Registros recuperados: 11
Data/hora: 08/06/2024 17:03:12

Акватория и берега Севастополя: экосистемные процессы и услуги обществу
Provedor de dados: 13
Autores: Шадрин, Н. В.; Павлова, Е. В.
В монографии представлены результаты изучения современной экологической ситуации в акватории Севастополя. Рассмотрены также вопросы взаимосвязей функционирования экосистем и социально-экономического развития. Для экологов, экономистов, менеджеров, студентов и жителей Севастополя.
Tipo: Book
Palavras-chave: Ecosystems; Scales; Models; Anthropogenic factors; Eutrophication; Ichthyoplankton; Phytoplankton; Zooplankton; Oil pollution; Litter; Mortality; Coastal zone; Biodiversity; Rivers; Zooplankton; Ecosystems; Scales; Models; Eutrophication; Rivers; Biodiversity; Phytoplankton; Anthropogenic factors; Mortality; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_6838; Http://aims.fao.org/aos/agrovoc/c_4881; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_33949; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999
URL: http://repository.ibss.org.ua/dspace/handle/99011/381

Проблемы антропогенного эвтрофирования и развития гипоксии в северо-западной части Черного моря
Provedor de dados: 13
Autores: Берлинский, Н. А.; Гаркавая, Г. П.; Богатова, Ю. И.
Рассмотрены этапы изучения влияния речного стока на процессы развития антропогенного эвтрофирования и гипоксии в северо-западной части Черного моря. Показано, что на современном этапе речной сток не является единственным источником биогенных веществ в северо-западной части Черного моря. Большую роль в динамике биогенных веществ этого региона играют процессы, протекающие в контактных зонах моря: “река – море”, “море – атмосфера”, “придонный слой – донные отложения” и “берег – море”.
Tipo: Journal Contribution
Palavras-chave: Anthropogenic factors; Anthropogenic factors; Http://aims.fao.org/aos/agrovoc/c_34996.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/479

Impact de l'anthropisation du lac sud de Tunis (Tunisie) sur la structure automnale des peuplementsde nematodes libres
Provedor de dados: 20
Autores: Hermi, M.; Aissa, P.
The answer of the free nematode populations to the physico - chemical state of  “ lake ” south Tunis has been studied in autumn 96 from 10 sampling sites. Their very weak specific diversity (Hermi, 2001) and the non selective détritivorous proliferation (1B) bound to the strong contents in recorded organic matter (Hermi, 2001) revealed the sensitivity of nematodes to the eutrophication and nutritionnal pollution. According to several interrelationships calculations, the waters saturation in oxygen, their contents in abeyance matter and in nitrogen as well as the sediments granulometry and their contents in certain heavy metals, appeared the most lagoonar determining parameters.  Otherwise, the answer of nematofaunistic communities living in South lake was...
Tipo: Journal Contribution
Palavras-chave: Species diversity; Trophic structure; Anthropogenic factors; Species diversity; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2002
URL: http://hdl.handle.net/1834/245

Characterizing and Comparing the Spawning Habitats of Sardine (Sardinops sagax) and Anchovy (Engraulis encrasicolus) in the Northern Benguela Region
Provedor de dados: 20
Autores: Tjizoo,Mbeurora Beau.
Spawning habitats of sardine and anchovy in eastern boundary current systems are characterized in an attempt to understand the fluctuations observed in their abundance. The northern Benguela, as an eastern boundary current system, is characterized by turbulent conditions that seem to govern the variability observed in the abundance of these species. Sardine and anchovy have developed mechanisms that enable them to maximize productivity. In the northern Benguela, spawning intensity is historically known to be high in periods and vicinities where turbulence is reduced. However, it is believed that selection of conditions for spawning by these species may change withfluctuations in abundance of fish.
Tipo: Theses and Dissertations
Palavras-chave: Sardine fisheries; Spawning; Anchovy fisheries; Habitat; Ecosystems; Sea surface temperature; Salinity; Spatial distribution; Climatic changes; Anthropogenic factors; Pelagic environment; Circulation; Coastlines.
Ano: 2008
URL: http://hdl.handle.net/1834/5231

Essai d'évaluation de la qualité des eaux de ruissellement du bassin versant de la lagune de Bizerte
Provedor de dados: 20
Autores: Hammami, J.; Brahim, M.; Gueddari, M.
:تقع بحيرة بنزرت في الشمال التونسي وتغذيها عدة أودية تنبع من حوض يمتد على مساحة شاسعة. وتمثل التقلبات المناخية والأنشطة الإقتصادية المتزايدة في السنوات الأخيرة أهم العوامل المؤثرة في هذا الحوض وفي السيول التي تنبع منه في اتجاه البحيرة.  لقد قمنا في شهر فيفري في سنة 2003 باقتـاء عينات من الماء مـن 15 مصـب لتحليلـها ( درجة الحرارة، درجة الحموضة، نسبة الأكسجين، الكلوروفيل والمواد العضوية والمعدنية الأزوتية والفسفورية) قصد دراسة هذه الظاهرة.  وبينت النتائج التي تم الحصول عليها بأن مياه روافد بحيرة بنزرت تتميز عموما بنسبة عالية للأكسجين وبدرجة حموضة عادية إلى مرتفعة نوعا ما. لكن مياه مصب وادي المرازيق وقنيش والذين يقعان بالتوالي في الشمال الغربي والجنوب الشرقي للبحيرة محملا بأكثر نسبة من المواد الأزوتية والفسفورية. تظهر هذه النتيجة واضحة في التحاليل الإحصائية...
Tipo: Journal Contribution
Palavras-chave: Runoff; Anthropogenic factors; Chlorophylls; Physical properties; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Anthropogenic factors; Chlorophylls; Physical properties; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005
URL: http://hdl.handle.net/1834/1533

Implications of climate change on the management of Rift Valley lakes in Kenya. The case of lake Baringo
Provedor de dados: 20
Autores: Ngaira, Josephine K.
Climate patterns of the World became very variable during the last half of the twentieth century. Causes of this variability/change have been identified as: Sun Spot activity, ozone depletion, decline in the solar beam, with the more pronounced especially in Africa being Increased atmospheric carbondioxide, and albedo change due to anthropogenic factors. The most affected weather elements by the above mentioned factors particularly in the tropics are Rainfall and Temperature, and the climatic environments most affected by the named weather elements are the arid and semi-arid lands which are already moisture constrained. The rift valley in Kenya, where most of the lakes are located experience Arid and Semi-Arid climate. The lakes located in this region are...
Tipo: Proceedings Paper
Palavras-chave: Climatic changes; Resource management; Lake basins; Anthropogenic factors; Inland waters; Environmental impact; Water policy; Lake dynamics; Arid environments; Rainfall; Water resources.
Ano: 2006
URL: http://hdl.handle.net/1834/1472

Distribution and Abundance of Finfish in Godineau Swamp
Provedor de dados: 20
Autores: Ramsundar, H.
The Godineau Swamp is home to several species of plants, wildlife, fish and waterfowl, including our protected Scarlet Ibis. It has been heavily influenced by anthropogenic activities and probably needs careful regulation of its development in order to obtain the maximum benefits from the swamp without destroying it. The Fisheries component of the Godineau Swamp Research Project aims to document the fish species that live in the swamp, their relative distribution and abundance and characterize the fishing practices in the area. The first phase has been completed and the second phase, characterisation of the fishing practices, is carded to begin in mid- November. The whole Godineau Research project is directed at assessing the ecology of the swamp in its...
Tipo: Other
Palavras-chave: Anthropogenic factors; Finfish fisheries; Anthropogenic factors; Http://aims.fao.org/aos/agrovoc/c_34996.
Ano: 2002
URL: http://hdl.handle.net/1834/2914

Water quality trends and input loads to Lake Nakuru
Provedor de dados: 20
Autores: Kulecho, Andrew; Muhandiki, Victor.
Water quality trends of Lake Nakuru, Kenya and its feeder streams were monitored in 2001-2004. Water samples were obtained from eleven stations in the lake and five points on inflowing streams. The items monitored were physico-chemical and biological components. The drainage basin was characterized by recurrence of dry spells throughout the period with water losses in the lake exceeding the amount received to cause a fall in water volume. The lake water salts content rose – conductivity and alkalinity reached 58 ms/cm and 5,200 mg/l respectively. PH was more or less constant (10.00 – 10.36). Daytime oxygen concentration in the mid-lake system rose (to greater than 20 mg/l) while remaining low in the inflow portions of the lake. On one occasion, the lake...
Tipo: Proceedings Paper
Palavras-chave: Water quality; Biomass; Mortality causes; Anthropogenic factors; Phytoplankton; Pollution effects; Degradation; Man-induced effects; Inland waters; Freshwater pollution; Physicochemical properties; Inflow; Environmental monitoring; Land use; Urbanization; Environmental impact; Pollution; Freshwater.
Ano: 2006
URL: http://hdl.handle.net/1834/5312

Essai d’évaluation de la qualite des eaux de ruissellement du bassin versant de la lagune de Bizerte
Provedor de dados: 20
Autores: Hammami, J.; Brahim, M.; Gueddari, M.
La lagune de Bizerte, située en Tunisie nord-orientale, constitue un bassin récepteur d’un réseau hydrographique bien développé. Afin d’apprécier l’impact des facteurs naturels et anthropiques sur les eaux de ruissellement du bassin versant de cette lagune, une campagne de prélèvement d’eau a été effectuée en février 2003 (période de crue) au niveau de la partie aval de quinze cours d’eau, à raison d’un échantillon par cours d’eau. Les échantillons d’eau prélevés ont fait l’objet de mesure in situ des variables physico-chimiques (température, pH et O2 dissous) et d’analyses au laboratoire de la chlorophylle a et des différentes formes organiques et inorganiques dissoutes de l’azote et du phosphore. Les résultats obtenus ont montré que les eaux de...
Tipo: Journal Contribution
Palavras-chave: Anthropogenic factors; Chemical properties; Chlorophylls; Nitrogen; Phosphorus; Physical properties; Pollution monitoring; Runoff; Water quality; Chemical properties; Nitrogen; Phosphorus; Runoff; Water quality; Chlorophylls; Anthropogenic factors; Physical properties; Http://aims.fao.org/aos/agrovoc/c_9754; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804; Http://aims.fao.org/aos/agrovoc/c_35388; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13328.
Ano: 2005
URL: http://hdl.handle.net/1834/3747

Impact of agro-industrial activities on the water quality of River Nyando, Lake Victoria Basin, Kenya
Provedor de dados: 20
Autores: Raburu, P. O.; Okeyo-Owuor, J.B.
The impact of agro-industrial activities on the water quality within River Nyando, Lake Victoria Basin (Kenya) was studied at different hierarchical levels between August 1997 and June 1999. Triplicate water samples were collected on a monthly basis from various stations ranging from the source to the mouth of the river and analyzed for selected physical and chemical water quality parameters using standard analytical methods. Statistical analysis was performed using MINITAB and STATISTICA computer packages. Agricultural land use was found to be the major factor contributing to changes in water quality. Salinity and pH varied at river basin scale, turbidity, TDS and conductivity at catchment scale, while DO, alkalinity and pH at subcatchment and river reach...
Tipo: Proceedings Paper
Palavras-chave: Water quality; Environmental impact; Industrial wastes; Inland waters; Rivers; Anthropogenic factors; River basin management; Statistical analysis; Physicochemical properties; Land use; Limnological data; Environmental monitoring; Resource management; Environment management; Agricultural pollution; Water quality; Environmental impact; Rivers; Statistical analysis; Land use; Environmental monitoring; Industrial wastes; Inland waters; Anthropogenic factors; Physicochemical properties; Resource management; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_24420; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_7378; Http://aims.fao.org/aos/agrovoc/c_4182; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_11763; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_13330; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006
URL: http://hdl.handle.net/1834/3501

A case study of ships forming and not forming tracks in moderately polluted clouds
Provedor de dados: 27
Autores: Noone, K.J.; Öström, E.; Ferek, R.J.; Garrett, T.; Hobbs, P.V.; Johnson, D.W.; Taylor, J.P.; Russell, L.M.; Flagan, R.C.; Seinfeld, J.H.; O'Dowd, C.D.; Smith, M.H.; Durkee, P.A.; Nielsen, K.; Hudson, J.G.; Pockalny, R.A.; De Bock, L.; Van Grieken, R.E.; Gasparovic, R.F.; Brooks, I.
The effects of anthropogenic particulate emissions from ships on the radiative, microphysical, and chemical properties of m(oderately polluted marine stratiform clouds are examined. A case study of two ships in the same air mass is presented where one of the vessels caused a discernible ship track while the other did not. &lt;i&gt;In situ&lt;/i&gt; measurements of cloud droplet size distributions, liquid water content, and cloud radiative properties, as well as aerosol size distributions (outside cloud, interstitial, and cloud droplet residual particles) and aerosol chemistry, are presented. These are related to measurements of cloud radiative properties. The differences between the aerosol in the two ship plumes are discussed; these indicate that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerosols; Air pollution; Albedo; Anthropogenic factors; Atmospheric boundary layer; Atmospheric particulates; Chemical plumes; Cloud physics; Clouds; Droplets; Fuels; Ocean-atmosphere system; Pollution effects; Radiative transfer; Ships; Size distribution.
Ano: 2000
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8840