- 期刊
- OpenAccess
Spatio-temporal Distribuution, Abundance and Species Composition of Zooplankton of Woji-okpoka Creek, Port Harcourt, Nigeria
並列摘要
Woji-Okpoka Creek is situated in a strategic location in Port Harcourt, Rivers State, Nigeria and it receives domestic and industrial wastes from the Trans-amadi industrial Layout, main Port Harcourt abattoir and riverine communities. There is little information on the zooplankton of this creek. The study investigated species composition, diversity, abundance and distribution of zooplankton as well as some physico-chemical parameters that affect this organism. Zooplankton and surface water samples were collected monthly from May 2004-April 2006 at low and high tides from ten stations according to APHA methods. These were analysed for temperature, turbidity, transparency, salinity, dissolved oxygen (DO), biological oxygen demand (BOD), pH and nutrients. Zooplankton was identified microscopically. Species diversity was calculated using standard indices. Data was analysed using analysis of variance, Duncan multiple range and descriptive statistics. Zooplankton demonstrated significant temporal variation (P＜0.05). A total of 85 species dominated by copepods (43.4%) were identified. Diversity indices for copepods were: 1.0±0.03 (Margalef) and 0.5±0.02 (Shannon). Water temperature 28.6±0.06℃, turbidity 3.6±0.32 NTU and transparency 0.7±0.01m showed significant temporal variations (P＜0.05). Water chemical parameters were: salinity, 14.4±4.67‰; DO, 5.0±0.10mg/l; BOD, 3.3±0.09mg/l and alkalinity, 84.1±1.41mg/l. Phosphate and ammonia exceeded FEPA and USEPA acceptable levels for natural aquatic bodies. Phosphate demonstrated significant spatial variation (P＜0.05). The presence of dominant copepods indicates an environment under stress. The domestic and industrial effluents should be recycled or and treated instead of being discharged into this creek.
延伸閱讀
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