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Articles by Arun
Total Records ( 1 ) for Arun
  N. Jeyaraj , Stebin Joseph , Arun , A. Suhaila , L. Divya and S. Ravikumar
  Zooplankton plays an important role in the marine food chain as intermediate link between phytoplankton and fish. Many of them are known to play important roles in marine ecosystems, including those in the food chain and matter transfer but there are also many species whose distribution and ecology are mostly unknown. The present study accounts deals with aspect of distribution and tidal influence of zooplankton from Estuarine regions along the Northern Kerala. The samples were taken in horizontal hauls using Hydro-Bios net (15 μm mesh size and 0.5 m mouth diameter) during high and low tide. The zooplankton community consisted of 65 species. Copepoda was the most important group both in term of species number and abundance. The species documented during low tide belong to groups with average percentage composition (%) such as calonoidia (25.37), cyclopodia (7.87), Harpacticoida (10.82), copepodites (18.11), foraminifera (1.99), ciliata (18.11), chaetognatha (2.88), cladocera (6.82), isopods (2.8) and larvae (13.28). While during high tide (%) groups include calonoidia (29.34), cyclopodia (4.69), Harpacticoida (4.38). The remaining groups viz., ctenophore, doliolids, siphonophores, isopods, ostracoda, cladocera, ctenophore, decapoda and fish eggs occurred sporadically and in small numbers. The highest abundance (1096 No. L-1) was observed during high tide from Azhlithala-Station 2, while the lowest (117 No. L-1) was detected during high tide from Chittari palam-Station 2. Both diversity and evenness was higher in Azhithala-Station 1 during high tide whereas the lowest diversity was observed during low tide from Chittari palam-Station 2 and no significant differences in dominance and total taxa of the studied area. The significant negative correlation obtained between the zooplankton density and evenness (-0.954) while positive correlation (0.993) obtained between diversity index and evenness. Further, multivariate analysis such as cluster analysis and PCA was engaged to correlate the zooplankton diversity. These analyses afford a superior significant in similarity and dissimilarity with in zooplankton community and studied sites.
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