000			nam a22 7a 4500
999			_c9368 _d9368
003			OSt
005			20181226101655.0
008			181214b xxu||||| |||| 00| 0 eng d
040			_cNARA
100			_917447 _aDe Silva, K.H.W.L.
245			_aSubstrate characteristics & species diversity of marine angiosperms in a micro-tidal basin estuary on the west coast of Sri Lanka
260			_aSri Lanka, _bSri Lanka Association for Fisheries & Aquatic Resources, _c2007,
300			_a103-114p.
440			_917449 _aSri Lanka Journal of Aquatic Science _n; Vol.12
520			_aDiversity of marine angiosperm species (seagrasses) at Kadolkele in Meegamnwa (Negombo) estuary was studied with a view to understanding the effect of substrate characteristics on diversity. Seagrass samples were obtained along three line transects, laid perpendicular to the shoreline at 20 m intervals. Shannon-Wiener index was used to determine the species diversity of seagrasses in the study site at Kadolkele that was divided into three strata, demarcated by the distance, i.e. 0-10 m. 10-20 m and 20-30 m from the shoreline. Comparison of Shannon-Wiener index values indicated that the diversity' of first stratum close to the shoreline was sienificantlv different * C / m' from that of the other two among which no significant difference was found to occur. Substrate pH, soil electrical conductivity, organic mater content and particle size distribution were measured from the substrate samples taken from each stratum. No statistically significant difference was observed with pH (3.92-6.82) and particle size distribution among the three strata. Soil electrical conductivity and organic matter content of stratum 3 however, was significantly different (p< 0.05) from the other two strata. Kadolkele seagrass bed consisted of two species and Halodule pinifolia (5822 shoots nD) dominated over Halophila oval is (1030 shoots nf2). The area adjacent (0-3 m) to thejnangroves at the shoreline was devoid of seagrasses ancff ovalis was absent in stratum 1, indicating that substrate characteristics have a marginal effect on the species richness of the seagrasses. Although species richness was similar in the other two strata, higher (Shannon) evenness (0.231), despite the relatively low abundance in stratum 2, contributes to its higher species diversity. Present study therefore documents the subtle habitat partitioning of co-existing marine angiosperm species in a limited area in Meegamuwa estuary.
700			_917448 _aAmarasinghe, M.D.
942			_cRP _2ddc