PLANT AND GASTROPODS ZONATION IN SUNGAI SEJAIE MANGROVE, SARAWAK by Shabdin Mohd. Long & Hidir Marzuki Plant and gasropods were studied in Sungai *iti" ti1t:Lt-::"t' P"";;, S.u"7* 'o at'ermine their zonations' The transect llne was esrablished from high t" l"* iia" levels' Plants and gastropods found in the rransecr vr.r .... or,l.j. Similarly all gastrooods found from sediment surface to uP on ,t" "ttJ*"'"-J'o "toidtd' Platttt within high tide to 150 metres ttansect to"'i"ta of several species' namely Deris elliptica' Nypa fruiticans, Sonneratia caseolaris' Brugueira gynnothiza' Acanthus ,1ii,iit,,y,.y:::r::",i;;';"i)':{;*r*;,*'#;,t';:,::f,:,"'};; :::::I:' i ^:i:#^ff i. ;;- t "u.,, ul,d .*i,,. u"o''' w ithinI 8 0 to 2 8 0 rn.rr", from the nigh tiat lt" el' Sonneratia alba was found at 280 metres from the high tide rt"ii ""i^f"rmed the front zone in Sungai Seiaie mangrove for"st' Plantlot'otio" in the Sungai Seiaie mangrove forest is not clearly defrned' nft""" species of gusttloods were identifred fronr rhe Sr-rneai s","'t t"i-*-t::-t i;tt;' nimelv Th'tt "::t::''',1","':,'':,', Abstract 'ii)J* Io!: ;' ;; ; i; ;; ;; ;;, ;', 1-, )a* ;: 1, ;'ro1ry o r':'as rro pod so' r' :'' -r n d from high co low tide levels' Two groups o[gastropods \r'ere r-er::-:]h. zone from sediment surface uP to rwo metres heighc on the mf,t.!:r'r\'' trees.Thedifferencesi"ftotito"tulandverticalzonationofgastropodtlr the Sungai Sejaiemangrove forest were Possibly.d": t: th-tt-9ril::trl' ability to withstand t*io""t above the water' microhabit4t preterences and food availabilitY' j l INTRODUCTION lrr{he mangrove is a unique ecosystem, rich and complex in fauna I and flora. tntu"g'o"t iott" occurs ulong the Sarawak coastline I and wirhin ,iie, estrruries where sedlmet't (mostly silt and clay) brought do*" b; 'h" rivers is being deposited' This area is