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Distribution of molluscan fauna in the Karangad estuarine mangroves, South East Coast of India

Advances in Environmental Sciences 01/2010;
Source: DOAJ

ABSTRACT A survey has been made during February 2010 to know the pattern of molluscan fauna inthe mangroves located along the Karangad estuary. During the present investigation in the researcharea, 25 species of molluscs were recorded. They belong to 14 genera, 10 families and 5 orders. Inthe study area, 13 species of gastropods namely, Cerithidea fluviatilis, Terebralia palustris, Cerithiumcitrinum, C. scabridum, C. obeliscus, Littorina scabra, L. undulata, Planaxis sulcatus, Drupamargariticola, D. heptagonalis, Thais rudolphi, T. bufo, and T. tissoti and 12 species of bivalves –Gafrarium tumidum, G. pectinatum, Crassostrea madrasensis, Mactra cuneata, Tellina ala, T. bruguieri,Saccostrea cucculata, Modiolus metcalfei, M. tulipa, M. traillii, Meretrix meretrix and M. casta - wererecorded.

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    ABSTRACT: Intertidal distribution of Cerithium scabridum was studied on rocky Intertidal areas at Sutrapada (SP), Dhamlej (DH) and Kodinar (KO) along the coastal Saurashtra, Gujarat, India. Total 10 Line transect intercepted with 0.25 m2 quadrate were laid perpendicular to the shore line at each study site every month (December, 2011 to December, 2012). Total 6 quadrates (0.25 m2) were laid randomly per line transect from upper to lower intertidal mark for the quantification of the species. Maximum abundance of the C. Scabridum was observed in upper intertidal zone of all the study sites. Ecological attributes like abundance, density and frequency of occurrence of species were also calculated and they exhibited significant spatio-temporal variations at different study sites. Seasonal variability of sea water parameters like sea water temperature, salinity and pH were also studied and correlated with ecological attributes of species. Sea water temperature showed significant correlation with mean seasonal abundance of the species at all the study sites (SP: R2=0.77, P<0.05, DH: R2=0.91, P<0.05, KO: R2=0.78, P<0.05). In the present study, It was observed that seasonal changes in abiotic factors and chemical properties of sea water has prominent effect on the intertidal distribution of the species.
    National Conference On Biodiversity: Status and Challenges In conservation, B. N. Bandodkar Collage of Science, Thane, Maharashtra, India; 11/2013

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