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  • Artikel  (4)
  • Artikel (Open Access)  (4)
  • Marine pollution  (3)
  • Chemistry  (1)
  • United States
  • Alexandria: National Institute of Oceanography and Fisheries  (3)
  • Maputo, CDS-MICOA  (1)
  • 2005-2009  (4)
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  • 2005-2009  (4)
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  • 1
    Publikationsdatum: 2021-05-19
    Beschreibung: A poluição marinha e costeira em Moçambique é umas das questões ambientais mais preocupantes, não só em termos ecológicos como também em termos económicos. O desenvolvimento da indústria turística, além de benefícios directos para a economia local, regional e até nacional, pode igualmente acarretar aspectos negativos.. como é, por exemplo, o aumento da poluição costeira. O distrito de Matutuíne, Província de Maputo - Sul de Moçambique, apresenta um elevado potencial de desenvolvimento turístico, que.. durante a sua implementação irá, certamente, ser acompanhada por um aumento da poluição das praias por resíduos sólidos, vulgarmente denominados "lixo do turista". … Assim, em Janeiro do presente ano, foi efectuada uma avaliação da composição e quantidade de resíduos sólidos existentes em quatro áreas à volta da Ponta Malongane. Duas técnicas foram usadas para tal: (i) recolha aleatória (cobrindo uma área aproximada de 4 000 m2) realizadas por 2 pessoas durante 10 minutos; e (ii) recolhas sistemáticas através de 5 quadrículas de 10 x 10 m. A amostragem aleatória foi efectuada apenas numa das áreas (praias em frente ao Parque de Campismo) com o objectivo de se fazer uma comparação entre as duas técnicas. Da amostragem aleatória e sistemática, obteve-se resultados muito similares, demonstrando que a escolha de qualquer uma delas deverá ser baseada em factores de ordem puramente logística (disponibilidade de tempo, dinheiro, recursos humanos, etc). De todas as categorias de resíduos sólidos consideradas, os plásticos dominaram com percentagens que variaram de 68 a 93 %. De um modo geral, as áreas mais usadas como destino turístico apresentaram maior quantidade e diversidade de resíduos sólidos. É de salientar a relativamente elevada percentagem de alcatrão na praia em frente ao Parque de Campismo. A quantidade total de resíduos encontrados foi considerada baixa (sempre inferior a 1 Kg / 100 m2) e as praias de Malongane foram consideradas em estado não crítico de poluição. Por isso, e tendo em conta o potencial de crescimento da indústria turística da zona, são providenciadas medidas de acção preventiva de modo a manter e se possível, melhorar o estado de conservação e limpeza das praias.
    Beschreibung: Published
    Schlagwort(e): Marine pollution ; Heavy metals
    Repository-Name: AquaDocs
    Materialart: Working Paper , Non-Refereed
    Format: 376495 bytes
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    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Unbekannt
    Alexandria: National Institute of Oceanography and Fisheries
    Publikationsdatum: 2021-05-19
    Beschreibung: This Journal is published by National Institute of Oceanography and Fishereies, Alexandria, Egypt
    Beschreibung: The distribution of (Fe, Mn, Zn, Cu, Pb, Ni, Co and Cd) concentrations were determined in surface marine sediments and coral reefs at Wadi El-Gemal in the Red Sea area. There were significant differences in concentrations of heavy metals in the marine sediments relative to the coral reefs. Some heavy metal concentrations in sediments and coral reefs in the study area are high compared to that in the impact areas of the Egyptian Red Sea coast. The results indicate that the high concentrations of heavy metals in marine sediments and coral reefs are particularly affected by the high contribution of terrigenous materials through the stream of Wadi El-Gemal. Generally, heavy metals concentration in the sediments decreased with increasing distance from the shoreline with the exception of Pb, which increased with increasing distance from the shoreline. On the other hand, Pb concentration in coral reefs is high compared to that in some sediment samples at Wadi El- Gemal area. The grain size, carbonate, organic matter, phosphorus and heavy metals distribution reflect marked changes in lithology, biological activities in the sea and land geology of the study area. Carbonate content mainly of biogenic origin varies from 5.7 –69.5% of the sediments. Organic matter contents of the sediments (1.7 to 6.5%) and phosphorus content (110 to 5097ppm) usually reflect significant terrigenous influences. On the other hand, heavy metals show an increasing tendency in the mud fraction of Wadi El-Gemal area. The present work reflects how much the marine sediments and coral reefs are influenced by natural impacts from this wadi. The collected data will be useful in management and suitable development of the area, beside being helpful as database in the future.
    Beschreibung: NIOF
    Beschreibung: Published
    Schlagwort(e): Hard corals ; Wadi El-Gemal ; Natural impacts ; Heavy metals ; Environment ; Marine ecology ; Environments ; Marine ecology ; Marine pollution ; Sediments ; Coral reefs
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 1169765 bytes
    Format: 456258 bytes
    Format: 40425 bytes
    Format: application/pdf
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  • 3
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    Unbekannt
    Alexandria: National Institute of Oceanography and Fisheries
    Publikationsdatum: 2021-05-19
    Beschreibung: This journal is published by NIOF, Alexandria, Egypt
    Beschreibung: Polycyclic aromatic hydrocarbons (PAHs), the real contaminants of petroleum, were detected in the surface seawater of Alexandria coastal area in winter and spring seasons of 1995. Their order of predominance, particularly for the individual components were principally due to the processes of input, transport and fluxes. Variation of PAHs was not following seasonal changes but it was slightly affected by partial dissolution of the lowerboiling aromatic hydrocarbons. The most abundant component of aromatic hydrocarbons was pyrene (PAH),112ngI-1 followed by naphthalene(56ngI-1) and its alkylated derivatives (dicyclic), then phenanthrene(14ngI-1) and its methylated derivatives (tricyclic). The potential fish carcinogenic PAH, dibenz [a & c] anthracene was found in extremely trace levels. Most aromatic hydrocarbons present in seawater were arised from combustion of various petroleum and non-petroleum products, while few aromatics were found as a result of petroleum pollution. PAHs were also detected in rain water(25ngI-1). Plasticiser mate rials (phthalates) were determined everywhere at considerable levels in the coastal area of Alexandria; which is the first district in Egypt for producing and recycling polyethylene, plastics and nylons.
    Beschreibung: NIOF
    Beschreibung: Published
    Beschreibung: Polycyclic aromatic hydrocarbons, Sources, Seasonal changes, Natural variation, Plasticizer materials, Rain water
    Schlagwort(e): Marine environment ; Environment ; Chemical analysis ; Environments ; Marine environment ; Marine pollution ; Oil pollution
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 588590 bytes
    Format: 34554 bytes
    Format: application/pdf
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    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Unbekannt
    Alexandria: National Institute of Oceanography and Fisheries
    Publikationsdatum: 2021-05-19
    Beschreibung: This journal is published by the NIOF, Egypt
    Beschreibung: Lake Manzalah; the largest delta Lake in Egypt represents a dynamic system that has been undergoing continuous and pronounced changes since long times. In the last year’s this Lake faced drastic problems that retarded its environmental and fisheries development; the most serious one is the discharge of waste water. It is attempted in the present study to investigate the chemical characters of Lake Manzalah water during 2001-2002. Water temperature ranged from an average of 12.35oC in January and 29.14oC in July. Dissolved Oxygen, pH and total dissolved solids were found in ranges optimum for the living of marine and freshwater fish species. The average concentrations of nutrients lied in the following ranges: 1.24 to 4.89 μmol PO4 -3 l-1 , 5.08 to 28.73 μmol SiO4 -2 l-1 and 1.81 to 17.7 μ_mol NO3-1 l-1 The concentrations of phosphorus and nitrogen compounds were found to be relatively higher at the southern regions of the Lake near to the outlets of the drains.
    Beschreibung: NIOF
    Beschreibung: Published
    Schlagwort(e): Hydrography ; Water ; Chemistry ; Chemical composition ; Water content ; Environment ; Chemical composition ; Environments ; Water content ; Fisheries
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed , Article
    Format: 1623488 bytes
    Format: 46916 bytes
    Format: application/pdf
    Format: application/pdf
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