Paper Title
Zooplankton Community Structure Of Sungai Lukut And Its Estuary, Negeri Sembilan

Abstract
The zooplankton community structure was studied in Sungai LukutNegeri Sembilan between February to April 2015. Sampling station included the estuary as well as the river until freshwater (estuarine, brackish and freshwater). Sampling was conducted utilizing a tow net with a 30 cm diameter having a 150 µm-mesh. The zooplankton sampling was conducted during floods and ebbs for both spring and neap tides. Physico-chemical parameters including salinity (estuary=34.17±1.22, brackish=31.79±1.83, freshwater=28.13±5.37), dissolved oxygen(DO) (estuary=104.92±17.30, brackish=91.24±19.02, freshwater=78.23±24.53), temperature (Estuarine=30.01±0.82, brackish=30.27±0.55, freshwater=30.08±0.67), and pH (estuary=8.87±0.71, brackish=8.55±0.80, freshwater=8.42±0.62) were recorded in situ station during sampling utilizing YSI meter model 556 MPS. The density and range of zooplankton during Spring tide for floods and ebbs for nine stations were (mean=215.47±62.59ind.m3; range=117.22 to 306.59) and (mean=223.17±58.20 ind.m3; range=136.99 to 315.75) respectively. Whereas for density and range of zooplankton during Neap tide for floods and ebbs for nine stations were (mean=244.24±58.20 ind.m3; range=159.71 to 321.25) and (mean=297.98±107.52 ind.m3; range=175.46 to 470.35) respectively.The species diversity (H’), species richness (d) and species evenness (J) for neap flooding were H’=2.2; d=6.36 and J=0.68 respectively. For neap ebbing however, the species diversity was H’=2.16, species richness d=6.21 and species evenness was J=0.67 which showed that the evenness stay constant (J=0.6) during neap tide for both flooding and ebbing. Spring tide for flooding showed different reading which were species diversity (H’=2.19), species richness (d=6.44) and species evenness (J=0.68) while for ebbing the species diversity was (H’=2.31), species richness (d=6.49) and species evenness (J=0.71). Keywords— Zooplankton, Community Structure, Density, Sungai Lukut.