Occurrence of Diaphanosoma excisum (Sars) on a sandy beach at Balramgari (Orissa), India |
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Authors: | Anil Chatterji Z A Ansari J K Mishra Parveen Rattan A H Parulekar |
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Institution: | (1) National Institute of Oceanography, Dona Paula, 403 004 Goa, India;(2) College of Fisheries, Ratnagiri |
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Abstract: | The occurrence of Diaphanosoma excisum (Sars), a freshwater cladoceran, in benthic samples of an intertidal sandy beach is reported. Population density was seasonal. A relatively high density was recorded from June to September (south-west monsoon season) with a maximum (46 ind 10 cm–2) in September at a depth of 10–15 cm of sediment. A sudden decline occurred during north-east monsoon (October to January), and in the fair season (February to May), the cladocerans disappeared. Mean density varied (P<0.001) with sediment depth and season and showed a contagious dispersion. Abundance was negatively correlated with salinity (r = –0.76) but positively with POC (r =0.79) and mean grain size of the sediment (r = 0.93). The density of D. excisum was highest in fine sand. |
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Keywords: | Diaphanosoma excisum occurrence seasonality sandy beach |
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