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E-International Scientific Research JournalISSN: 2094-1749 Volume: 2 Issue: 4, 2010Species diversity was determined using the Shannon index of diversity and speciesrichness.ResultsColiform Contamination. Water samples from all seven stations in both samplingswere positive for total coliform (Table 1). In 2006, Stations 5 (Banonong) and 2 (Linabo) hadthe highest counts of Salmonella sp, with counts of 7.75 colonies x 10 3 100 ml -1 (±0.250) and7.1667 colonies x 10 3 100 ml -1 (± 0.347 ), respectively. The former station recorded evenhigher count (TNTC, too numerous to count) in the 2010 sampling, along with station 4(Ambogoc). Linabo recorded the second highest followed by Cawa-cawa and Polo. Esherichiacoli colonies were also too numerous to count in both stations on the same sampling period. Inthe 2006 sampling, the fecal coliform was highest in Ambogoc( 2.0 colonies x 10 3 100 ml -1 ±0.304) followed by Linabo (1.917 colonies x 10 3 100 ml -1 ± 0.344). These values were smallercompared to the counts obtained in November 1999 (Table 1) except for the TNTC readingsfor Salmonella sp. in Ambogoc and Banonong during the last sampling. Salmonella countsduring the 2010 sampling was significantly higher compared to the 2006 sampling but wascomparable to the 1999 sampling of SUAKCREM [F(2,17)= 4.156, p=0.034].Plankton Community. The plankton community in Liboran River were categorizedinto diatoms dinoflagellates and zooplankton (Fig. 3). As shown, the latter comprised 50% and46% of the total community in 2006 and 2010, respectively. The diatoms made up the 29%in both sampling periods while the dinoflagellates comprised the 21% (2006) and 25%(2010). Species composition and estimated population densities of plankton in Liboran Riverare presented in Tables 2 and 3.In 2006, the diatoms were composed of fifty-seven species with five dominant genera:Coscinodiscus, Navicula, Gyrosigma, Chaetoceros and Amphiprora. The blue-green alga,Oscillatoria was also abundant Table 2. A total of fourteen species of dinoflagellates wereidentified belonging to 11 genera. Three of these genera, Dinophysis, Ceratium andPeridinium are known to cause red tides. The first two genera dominated the dinoflagellatecommunity. Dinophysis has also toxin-producing species. Zooplankton was made up of 21species typically dominated by crustaceans particularly, the copepods. In 2010, there wereonly 44 species of diatoms, 14 dinoflagellates and 11 zooplankton species identified. Withregard to the diversity of the plankton community, richness and Shannon diversity indices were2.54 ±0.340 and 1.12 ±0.069, respectively in 2010 and 2.84 ±0.34 and 1.20 ± 0.10 in 2006.Table 1. Comparison of mean total coliform, Escherichia coli and Salmonellatyphymurium counts (colonies 100 ml -1 )with the study conducted bySUAKCREM in 1999.StationsSUAKCREM, 1999Colonies 100This studycolonies 100 ml -1 Colonies 100 -120102006Salmonella E. coli Salmonella E.coli Salmonella E. colisp.spsp369