Seasonal Variations in the Composition and Distribution of Planktonic Fauna in the Eastern Lagos Lagoon, Nigeria

Journal of Applied Sciences and Environmental Management

Bello, B.O.¹  Nkwoji, J.A.¹  Ajani, G.E.¹  Renner, K.O.¹  Balogun, K.J.¹  Igbo, J.K.¹  Yakub, A.S.¹ 

关键词: Zooplankton;    Juvenile stages;    Abundance;    Diversity;    Salinity;   

DOI  :  

学科分类：环境科学（综合）

来源: University of Port Harcourt * Department of Pure and Industrial Chemistry

【 摘 要 】

The composition and distribution of planktonic fauna (adult form of zooplankton and planktonicjuvenile forms of higher animals) within the eastern part of the Lagos Lagoon were investigated in July, 2008 andMarch, 2009 representing rainy and dry season respectively. Samples of water and planktonic fauna were collectedfrom twelve stations within the eastern axis of the Lagoon and analyzed using standard methods. The study areahad brackish water characteristics with fresh water condition (0‰ salinity across the 12 stations) in the rainyseason whereas the salinity ranged from 11.4‰ to 30.5‰ in the dry season. The adult forms zooplankton recordedin the rainy season were mainly Crustaceans, Chaetognathans and Rotifers while those collected during dry seasonbelonged to Crustacean, Cnidaria and Chordata. Crustaceans dominate both adult zooplankton and planktonicjuvenile fauna in the two seasons. The rainy season adult zooplankton count (515) was lower than that of dryseason (580) but the reverse was the case for the juvenile stages count (520 and 325 in rainy and dry seasonrespectively). Higher species abundance was recorded for both adult zooplankton (20) and juvenile stages (10) inrainy than dry season when 14 and 8 were recorded for the two groups respectively. Higher values were also ofcommunity structure indices (Margalef species richness and Shannon-Wiener species diversity) were recorded inthe rainy than dry season for the two groups of planktonic fauna. The findings show the influence of salinitygradients on distribution of planktonic fauna of the Lagos Lagoon.

【 授权许可】

Unknown