Biodiversity and extracellular enzymatic activity of heterotrophic bacterial communities in Bardawil Lagoon, Egypt

  • M Bahgat
  • A Dewedar
  • HM Shafik
  • EE Shabana

Abstract

The biodiversity of heterotrophic viable bacteria (209 isolates) in the hypersaline Bardawil Lagoon, Egypt, was studied. Composition and extracellular activities of viable culturable heterotrophic bacteria (VCHB) in the water and in non-colonised and seagrass-colonised sediments of Bardawil Lagoon were determined bimonthly during 1997 and 1998. The average ± SD total Kjeldhal nitrogen was 1.69 ± 0.44 mg l–1 in water, 335.95 ± 19.22 mg kg–1 in colonised sediments, and 215.5 ± 16.0 mg kg–1 in non-colonised sediments. Exoenzymatic bacterial activity (glycosidase) presented a seasonal trend with average values of 1.02 ± 0.16 μM cm–3 min–1 in colonised sediment samples and was 0.36 ± 0.27 μM cm–3 min–1 in non-colonised sediments. Mean of VCHB was 4 017 ± 565 cfu g–1 and 1 195 ± 242 cfu g–1 for colonised and non-colonised sediments, respectively. Bacterial isolates from Bardawil Lagoon water and sediments yielded a wide diversity of VCHB: a total of 209 different species, belonging to 13 genera from the water and 12 genera from the sediments.

African Journal of Aquatic Science 2010, 35(2): 199–203

Author Biographies

M Bahgat
Department of Botany, Faculty of Sciences, Port Said University, Port Said, Egypt
A Dewedar
Department of Botany, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
HM Shafik
Department of Botany, Faculty of Sciences, Port Said University, Port Said, Egypt
EE Shabana
Department of Botany, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
Section
Articles

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eISSN: 1727-9364
print ISSN: 1608-5914