MUSTAMIN IBRAHIM1,2♥,ABUBAKAR SIDIK KATILI1,2, ZULIANTO ZAKARIA1,2

1Department of Biology, Faculty of Mathematics and Natural Science, Universitas Negeri Gorontalo. Jl. Jenderal Sudirman No. 6, Gorontalo City 96128, Gorontalo Province, Indonesia. Tel: +62 812-4259-8182, ♥Email: tamin@ung.ac.id
2Center of Coastal Ecology Studies Based on Local Wisdom, Department of Biology, Universitas Negeri Gorontalo. Jl. Jenderal Sudirman No. 6, Gorontalo City 96128, Gorontalo Province, Indonesia

Abstrak

This study aimed to examine the potential carbon biomass value Rhizophoraceae stem. The study focused on description of the potential carbon biomass value on Rhizophoraceae stem. The study was conducted in Tabongo, Boalemo District, Gorontalo Province. The method used is a descriptive, while data analysis using quantitative descriptive method. The collection of data using the point center quarter meter (PCQM) method with make a line transect perpendicular from the coast toward the land. Four sampling point placed random research to be pushed. At each sampling point there are four quadrants. The calculation of the value of biomass carbon done with the measurement of the diameter of the tree 1.3 m above the surface of the ground. The calculation of the density of the vegetation using common mangrove allometry. The value of biomass carbon estimated by multiplying the value of biomass with carbon constant 50%. The research results obtained that biomass value of Rhizophoraceae stem was 15,708.88 kg/ ha or 245.45 kg/tree. Now the carbon in biomass in the stem of the mangrove was 7,854.44 kg/ha or 122.73 kg/tree. The average absorbed-carbon on the Rhizophoraceae was 450.40 kg/tree.

Keywords: Mangrove, rhizophoraceae, biomass, carbon

ABUBAKAR SIDIK KATILI♥, YULIANA RETNOWATI
1Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Gorontalo. Jl. Jenderal Sudirman No. 6, Kota Gorontalo 96128, Indonesia. Tel: +62-435-821125-821752, Fax.: +62-435-821752, ♥email: dikykatili@gmail.com
2Coastal Ecology Based Local Wisdom Research Center, Universitas Negeri Gorontalo. Kota Gorontalo 96128, Indonesia
Manuscript received: 16 March 2016. Revision accepted: April 2017.

Abstract. Katili AS, Retnowati Y. 2017. Short Communication: Isolation of Actinomycetes from mangrove ecosystem in Torosiaje, Gorontalo, Indonesia. Biodiversitas 18: xxxx. Actinomycetes is a group of positive gram microorganism known to produce secondary metabolic compounds that works as antibiotics, anti-fungus, anti-virus, anti-cancer, and other important enzymes for the industry. This research aimed at discovering the potentials of Actinomycetes of mangrove ecosystem in Torosiaje, Gorontalo, Indonesia. It focused on finding out the diversity of Actinomycetes at mangrove ecosystem in Torosiaje. Hence, various types of Actinomycetes that have potentials to create secondary metabolic compounds/bioactive compounds for industrial purposes can be found. This purpose can only be attained through isolation of actinomycetes. This isolation was conducted through characterization of morphological characteristics of the colony and the spore, molecular characterization through isolation of DNA genome of the actinomycetes, amplication of 16S rRNA through PCR, sequencing and reconstruction of phylogenetic tree. We were able to obtain the actinomycetes isolate from the sediment in ryzosphere area of Ceriops tagal, Bruguiera gymnorrhiza, Xylocarpus sp., Rhizophora apiculata, Avichenia sp., and Sonneratia alba species of mangrove. Each isolated actinomycetes has specific morphological characteristics. The density of isolated actinomycetes in Torosiaje mangrove area was very low with an average of 1 x 105 CFU gram-1 in each sediment.
Keywords: Actinomycetes, diversity, mangrove

Abstract

This research aimed to assess the degradation level of mangrove forest and the strategy to reduce the degradation level. The overall research time was 1 year, focusing on identification of mangrove forests degradation level, exploration of mangrove vegetation structure and preparation for mangrove degradation reduction strategy. The research was located in Tabongo Village, Dulupi District, Boalemo Regency, Gorontalo Province. The method used in the research was explorative survey, while the data analysis was done with quantitative descriptive analysis. The collecting method used was point centered quarter meter (PCQM) method. The degradation level of mangrove forests was analyzed by standard criteria of mangrove destruction according to Ministerial Decree of State Minister for The Environment (Kepmen. LH) No. 201 in 2004. Results showed that there are 4 species of mangrove plants in Tabongo village, Dulupi district namely Rhizophora apiculata Blume, Rhizophora mucronata Lamk., Ceriops tagal (Perr) C.B.Rob, and Bruguiera which included in the Rhizophoraceae family. Rhizophora apiculata had the highest IVI value at the stage of tree and sapling, while Rhizophora mucronata Lamk had the highest IVI value at the stage of seedling. Tabongo mangrove area was a Scrub or dwarf forest type generally. This type was classified as a typical mangrove found in low edges. Based on the relative coverage values of each mangrove species, the conditions were in the damage criteria due to the coverage value of <50%/ha. The reduction strategy that could be implemented to recover the quality of mangrove areas include (a) the assessment of the importance of the mangrove areas with regard to their ecological and economic value, (b) improving quality of mangrove habitat, (c) educational approach by making the mangrove areas as learning media and source, and (d) empowerment of people living around the mangrove areas.

Keywords: Degradation of mangrove forest, density, coverage value