Distribution and Condition of Sonneratia caseolaris Mangroves in the Siak River Tidal Area, Pekanbaru City

Marine Science Department of Faculty of Fisheries and Marine Scince Universitas Riau, Pekanbaru 28293

^* Corresponding author: efriyeldi@lecturer.unri.ac.id

Abstract

This research was carried out in the tidal area of the Siak River, Pekanbaru, Riau Province. The purpose of this research is to determine the distribution and condition of Sonneratia caseolaris in the tidal areas of the Siak River in Pekanbaru as a basis for assessing future sea level rise. The method used in this research is a survey method and purposive sampling technique was used to determine the sampling points. The distribution of S. caseolaris was mapped by determining the current most upstream distribution point. S. caseolaris is presented in terms of tree diameter and condition. The distribution and condition of S. caseolaris were analyzed descriptively. The results show that the distribution of S. caseolaris in the upstream direction currently reaches the point 0°32′48.39″ N and 101°27′25.97″ E. The density of S. caseolaris ranged from 1.67 – 2.67 ind/100m² for the sapling group and ranged from 3.67 – 18.67 ind/100m² for the tree group. S. caseolaris is found along river flows towards the estuary with tree diameters ranging from 1.91 – 3.82 cm for sampling and 4.14.- 48.09 for tree. The average diameter of the tree becomes larger towards the river mouth.