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Title: Study on the salinity gradient of Chilika lake before and after opening of new mouth to sea and its impact on seaweed diversity
Authors: Mohanty, Debabrata
Adhikary, Siba Prasad
Keywords: Chilika lake;New mouth;Salinity gradient;Seaweed diversity;Gracilaria verrucosa;RAPD
Issue Date: Aug-2015
Publisher: NISCAIR-CSIR, India
Abstract: Chilika lake, popularly known as chilka lake showed wide variation in salinity in its 4 sectors varying from almost zero in the Northern sector to 33 ppt in the Outer channel sector during the last decade of the 20th Century. Changes in the salinity gradient of Chilika at its different sectors after opening of a new mouth to Bay of Bengal in 2001 and it influence on seaweed diversity of the lagoon was assessed. Due to influx of seawater from the Bay of Bengal the Outer channel sector, especially after opening of the mouth remained higher throughout the year in all the seasons showing 8 to 15.7 ppt in post-monsoon, 22 to 28.5 ppt in winter and 32 to 35 ppt in summer seasons which was much higher than the salinity level of the lake in 2000. Comparative study of qualitative and quantitative occurrence of seaweeds in different sector in 2011 with the earlier reports up to 2000 showed that Chaetomorpha linum was recorded in all the sectors of the lagoon though earlier it was not recorded in the Northern sector prior to opening of the new mouth. Similarly Enteromorpha compressa recorded in Northern sector and Central sector at low to moderate salinity which was earlier confined to Central sector only. Enteromorpha intestinalis presently occurring all through the lake in abundance was earlier recorded in lower quantity in the Central and Southern sectors at moderate salinity levels. Growth of Gracilaria verrucosa was earlier recorded from Southern and Central sector only, however, it appeared in the Outer channel sector due to increase in salinity all through the lagoon. RAPD analysis showed that the two different of Gracilaria verrucosa occurring in the lagoon are genetically different, hence, could be two different ecophene of the species.
Page(s): 1176-1180
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.44(08) [August 2015]

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