International Journal of Environmental Sciences

Volume 5 Issue 2 2014- September 2014    Pages: 423- 431 <<Previous    Next>>

Studies on biomass of Seagrass, Seaweed and its associated fauna from    Chilika lagoon

Author Information:

Mitali Priyadarsini Pati1, Lakshman Nayak2, Satyabrata Das Sharma3
P.G. Department of Marine Sciences, Berhampur University, Berhampur
Bhanja Bihar, Berhampur, India

ABSTRACT

Chilika is the largest brackish water lagoon of India which is situated in state of Odisha. It harbours fresh water, brackish water and marine organisms. It is rich in floral and faunal diversity which is the unique feature of this lagoon. The present study is to highlight on seagrass, seaweed and its associated fauna in the southern sector of this lagoon. During the study period it was observed that there were 2 species of seagrasses (Holophila ovalis and Holodule uninervis) and a single species of seaweed (Gracillaria verrucosa) were available abundantly in this sector. The average biomass (Dry weight) of Holophila ovalis, Holodule uninervis and Gracillaria verrucosa were 113, 47.4 and 89 gms/m2 respectively. In addition to the availability of seagrass and seaweed, different species of Molluscan fauna were also collected from different vegetative parts of the seagrass and seaweed beds. The average biomass (Dry weight) of the Molluscan species in three respective seagrass and seaweed bed were 31.4, 45.6 and 255 gms/m2 respectively. Out of seven classes of Molluscan group, two classes were found from the seagrass and seaweed bed. Four species were recorded from gastropoda (Telescopium telescopium, Cerithidea cingulata, Oliva oliva and Conus virgo) and other two species were encountered from Bivalvia (Modiolus striatulus and Donax scortum) which were associated with the seagrasses and seaweed. Among different species of Gastropoda, Cerithidea cingulata was abundant and dominant species which was contributed maximum biomass (79%) associated with Holophila ovalis, where as this species was counted very less (9%) in the grass bed of Holodule uninervis with in the same area. The dominant species in the grass bed of Holodule uninervis was Modiolus striatulus which was contributing maximum biomass (82%). This is the unique feature in its distribution. Though Modiolus striatulus is rarely available in Holophila ovalis but plentily available in the seaweed beds of Gracillaria verrucosa. The reason of its ecological distribution is unknown. As it is a preliminary study on the associated fauna linked with seagrass and seaweed bed in Chilika lagoon, a detail study is required to know its ecological reasons of their distribution

Keywords: Biomass, Seagrass, Seaweed, associated Molluscan fauna.

DOI:10.6088/ijes.2014050100036

© 2014 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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