Diversity and Importance Value Index of Mangrove Vegetation at Jembatan Merah Village, North Gorontalo Regency

Abstract

This study aims to determine the diversity and Importance Value Index of mangrove vegetation in Jembatan Merah Village, Tomilito District, North Gorontalo Regency. Data collection was carried out from February to March 2017 using the line transect method drawn from the sea to the land. The research location was divided into 3 stations, and each station consisted of 3 observation lines. The data collected were analyzed to determine the level of diversity and Important Value Index. The results showed that in Jembatan Merah Village there were 15 species of mangroves, namely Aegiceras floridium, Avicennia alba, Avicennia marina, Avicennia oficinalis, Bruguiera cyllindrica, Bruguiera gymnorizha, Ceripos decandra, Ceriops tagal, Rhizophora apiculate, Rhizophora mucrocynata, Rhizhopora hydrocyiccea, Sonneratia alba, Sonneratia ovata, and Sonneratia caseolaris. The diversity index for the tree and sapling levels was included in the high category at all stations, while at the seedling level the diversity index was different, where Stations I and III were in the high category and Station II was in the medium category. The results of the Important Value Index analysis showed that the species that had the highest value were Sonneratia alba, Sonneratia caseolaris and Avicennia marina, respectively.