Mangrove community structure survey in Barangay Guisi and Linayasan, Altavas, Aklan

Abstract

The mangrove forest is a complex and unique community of medium to large tress, shrubs, vines and palms, oddly thriving with luxuriant growth in the least inviting habitats which have the barest and limited conditions for the growth and survival of higher plant life. This study aims to assess the community structure of mangroves in Barangay Guisi and Linayasan, Altavas, Aklan using accepted ecological indicators. The sampling site, Altavas, Aklan is located at the upper median of Panay Island. There was a total of 15 true mangrove species belonging to the 9 families in the area. The nine families are Family Myrsinaceae represented by Aegiceras corniculatum, Family <i>Avicenniaceae</i> represented by <i>Avicennia alba, Avicennia marina, Avicennia officinalis</i> and <i>Avicennia rumphiana</i>; Family Rhizophorceae represented by <i>Rhizophora apiculata, Rhizophora mucronata, Bruguiera gymnorrhiza</i> and <i>Bruguiera parviflora</i>; Family Bombacaceae represented by <i>Camptostemon phihppensis</i>; Family Rubiaceae represented by <i>Scyphiphora hydrophylaceae</i>; Family Meliaceae represented by <i>Xylocarpus granatum</i> and Family Palmae represented by <i>Nypa fruticans</i>. <i>Avicennia rumphiana</i> has the highest mean basal area of 23.21 (m2/ha), while <i>Xylocarpus granatum</i> had the lowest mean basal area of 0.01 (m2/ha). <i>Avicennia rumphiana</i> has the highest relative density of 57, while <i>Xylocarpus granatum</i> has the lowest relative density with a value of 1. <i>Avicennia rumphiana</i> and <i>Avicennia officinalis</i> had the highest relative frequency of 19.8667 <i>Aegiceras corniculatum, Excoecaria agallocha, Scyphtphora hydrophylaceae</i> and <i>Xylocarpus grunatum</i> on the other hand had the lowest relative frequency of 0.4. <i>Avicennia rumphiana</i> is the dominant species with a relative dominance value of 23.66, and <i>Xylocarpus granatum</i> is the least dominant species with relative dominance value of 0.01. <i>Avicennia rumphiana</i> is the most important species in the area with an importance value of 127.1816, and the least important species, as observed, is <i>Xylocarpus granatum</i> with an importance value of 1.685863. The index of diversity is 0.918655 for the entire area.