Patterns of microbial activity in the shallow bottom sediments of Lake Manzala, Egypt

  • M Bahgat
  • FM El Fawal
  • F Al-Misned
  • HA El-Serehy
  • S Shaheen

Abstract

General microbial activity, determined by hydrolysis of fluoresceine diacetate (FDA), was investigated in two sediment cores collected from Manzala Lake during November 2011. FDA hydrolysis positively correlated with total bacterial counts, bacterial biomass and chlorophyll a in both cores. The 10–20 cm subsurface layer in both cores had higher bacterial counts (2.03 x 106 and 1.6 x 106 cells g–1) and a higher Vmax (kinetic parameter of esterase activity; 177.8 and 117.8 μmol g–1 h–1), respectively, than the top 0–10 cm. In both cores the upper 40 cm had not received any Nilotic sediments, which may account for the atypical vertical profiles observed.

Keywords: bacteria, chlorophyll a, enzyme activity, pheophytin

African Journal of Aquatic Science 2013, 38(3): 323–329

Author Biographies

M Bahgat
Botany Department, Port Said University, Port Said, Egypt
FM El Fawal
Geology Department, Port Said University, Port Said, Egypt
F Al-Misned
Department of Zoology, College of Sciences, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
HA El-Serehy
Department of Zoology, College of Sciences, King Saud University, PO Box 2455, Riyadh 11451, Saudi Arabia
S Shaheen
Geology Department, Port Said University, Port Said, Egypt
Published
2013-12-05
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914