Abstract
St. Martin's Island is one of the unreached areas for the field of ecology, phycology and biodiversity research in global perspective. This study explored the present status of avaiable seaweeds and water physico-chemical properties through three locations (ST.1, ST.2 and ST.3) of the island. A total of 51 seaweed species were listed under 3 major groups, where Rhodophyceae possessed 41% species, following Phaeophyceae (31%) and Chlorophyceae (28%). The southern part (ST.3) consisted highest number of species (37%) and showed comparatively rich diversity according to three diversity indices (Shannon Weiner index, Simpson Index and Margalef index). The overall temperature found almost homogeneous in winter (24.68 °C) and pre-monsoon (29.05 °C). The lowest pH was recorded in northwestern location (ST.1) during high tide of winter (pH 8.34±0.24). The water was comparatively less saline in ST.2, and higher dissolved oxygen produced at ST.3 (7.05 to 7.58 mg/L). There were found significant relations among the physico-chemical properties and the seaweed groups in the island.
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