Data/hora: 01/06/2024 18:11:47

Provedor de dados: | 20
País: | Belgium

Título:

Seasonal dynamics of phytoplankton community in the bitter lakes and temsah lake

الديناميكية الفصلية لعشيرة الهائمات النباتية في البحيرات المرة وبحيرة التمساح

Autores: | Nassar, M.Z.; Shams El-Din, N.G.
Data: | 2007-01-16
Ano: | 2006
Palavras-chave: | Hydrobiology Studies; Biodiversity Phytoplankton Phytoplankton http://aims.fao.org/aos/agrovoc/c_13344.
Resumo: | Water and phytoplankton samples were sampled on a seasonally basis, from autumn 2002 to summer 2003 at five stations located in Bitter Lakes and four at Temsah Lake. A total of 116 taxa were identified, among which 72 taxa of diatoms, 16 dinoflagellates, 14 chlorphytes, 11 cyanophytes, two euglenophytes and one silicoflagellate species. Bitter Lakes were more diversified than Temsah Lake, although the highest population density was recorded at Temsah Lake. A total of 108 taxa were identified in Bitter Lakes among which 68 taxa of diatoms, 15 dinoflagellates, 11 chlorophytes, 11 cyanophytes two euglenophytes and one silicoflagellate species, while 102 taxa were identified among which 60 taxa of diatoms, 14 dinoflagellates, 14 chlorophytes, 11 cyanophytes, two euglenophytes and one silicoflagellate species in Temsah Lake. The very high phosphate and nitrate concentrations in the two lakes are indicators of pollution which may be due to the discharge of agricultural and sewage wastes enriched with nutrients as well as the human activities there. Chlorophyll-a content showed similar pattern of changes as that of phytoplankton abundance. It varied between 0.40 mg/m3 and 1.03 mg/m3 (Bitter Lakes) and between 0.67 mg/m3 and 1.54 mg/m3 (Temsah Lake)with annual average of 0.65 mg/m3 and 1.02 mg/m3 , respectively. Diversity values varied between 2.64 nats and 3.92 nats (Bitter Lakes) and between 1.28 nats and 3.78 nats  (Temsah Lake), with annual average of 3.3 nats and 2.59 nats respectively. Statistically, positive correlations were found between phytoplankton counts and dissolved oxygen (r = 0.64 &amp; 0.93), nitrate (r = 0.52 for Bitter Lakes), phosphate (r = 0.48 &amp; 0.64)for Bitter Lakes and Temsah Lake, respectively. While an inverse correlation was observed between the phytoplankton abundance and species diversity (r = -0.75) in Temsah Lake. In addition the stepwise multiple regression equations were calculated for the biological characteristics in relation to physico-chemical characteristics for each lake. The present study indicates that the phytoplankton in the two lakes of Suez Canal was slightly more diversified than other adjacent areas (Suez and Aqaba Gulfs of the Red Sea as well as the Egyptian waters of eastern Mediterranean). There was a pronounced drop in phytoplankton abundance and high nutrient concentrations in the two lakes when compared with previous studies. Our recommendation is to avoid as far as possible the discharge of oil spills, sewage and agriculture wastes into the water of Suez Canal, specially at Temsah Lake.
Tipo: | Journal Contribution
Idioma: | Inglês

Identificador:

Egyptian journal of aquatic research, 32(1). p. 198-219

1687-4285

http://hdl.handle.net/1834/1443

Editor: | National Institute of Oceanograhy and Fisheries (NIOF)

Formato:

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