Elok Faiqoh

Struktutr Komunitas Ikan dan Tutupan Karang di Area Biorock Desa Pemuteran, Buleleng, Bali

Biorock is new method of coral reef rehabilitation. Today, the structure Biorock been made in various shapes and sizes. Therefore, assessment of reef fish communities and coral cover on the artificial reef Biorock of different sizes are needed as a as the basic information and the utilization of the results of the conservation area. From this research, it is known that the six Biorock structure obtained reef fish composition consisting of 18 Family and 45 fish species and abundance of total 2065 individuals. In accordance with the classification of diversity index Shannon - wiener all sizes Biorock the research object falls into the range of values diversity moderately 1.57 - 2.95. The results of the uniformity index show that in every size Biorock has equal distribution of species. From the results of the dominance of index calculation (C) is included in the low category. Where in any size Biorock not happen domination by a single species. In all sizes Biorock have value mengindikasinkan that coral is in good shape. The highest coral cover in sequence contained in the structure of Small-sized Biorock 1, 1 medium, 2 Large, 2 Small, 2 Medium, and 1 Large. From analysis using Bray-Curtis similarity index gained 2 groups Biorock structures that have similar types of fish encountered. The first group is the first Large-sized Biorock structure, Large 2, and the medium 1. The second group is the structure of Small-sized Biorock 1, 2 medium and 2 Small.

Variasi Geografik Kelimpahan Zooplankton di Perairan Terganggu, Kepulauan Seribu, Indonesia

Zooplankton play a significant role in ecosystem as secondary producer. Climate change will potentially affect the abundance and global composition of zooplankton. This research aimed to study the geographical variation of zooplankton abundance relative to anthropogenic pressure. The research was conducted in April 2014 in area with presumably distinct anthropogenic level by its relative distance to the mainland of Jakarta. Samples were collected at Pramuka Island, Karang Beras Island, Kotok Island, and Sepa Island where subsequently lying to the nearest until furthest distance from mainland. Zooplankton samples were collected by towing the plankton net for 10 minutes for each site for three replicates. Abundance was obtained from Pramuka Island was 266698,214 ind/L, Karang Beras Island was 597363,1 ind/L, Kotok Island was 526447,8 ind/L and Sepa Island was 438225,3 ind/L. Overall, the closer to mainland, the richer nutrient and the more abundant zooplankton was conceived in the waters. Surprisingly, in Pramuka Island, the nearest island to mainland among other sites, had the lowest abundance of zooplankton although nutrient level was the richest among others.

Analisis vegetasi dan struktur komunitas Mangrove Di Teluk Benoa, Bali

Mangrove forest is one of the natural resources having value and mean a lot both in terms of its physical, biological and socioeconomic. Due to the increasing needs of human’s livelihood causing them to intervered in these ecosystems. It can be seen from the land’s conversion of these mangroves into saltwater fishponds, human settlements, industrial areas and others. One of the mangrove area in Bali is Benoa Bay. This study aims is to determine the structure and vegetation and also the dominant mangrove species in the Benoa Bay mangrove forest in Bali. The method used in this study is a sample survey or a field survey method. At each observation station along the transect line, plots are made with a size of 10m x 10m with 3 plots for each station. Then, on each observation plot any individuals mangrove species found are counted per each species. For the data analysis purposes, each trees, saplings and seedlings individual are noted its name type and the trunk circumference at chest level, while for vegetation strata seedling are noted its name type and the number of individuals of each species. For the mangrove vegetation were found that its consists of 11 true mangrove species and one species of mangrove follow which was Waru Sea (Thespesia popunema). At the I station, the tree level mangrove vegetation is dominated by Sonneratia alba (INP) counted to 130.61, as the seedlings level was dominated by Rhizophora mucronata (INP) of 246.11. At the II station, tree level mangrove vegetation is dominated by Rhizophora mucronata (INP) counted to 109.59, while the seedling rate was dominated by Rhizophora stylosa (INP) of 91.60. At the III station, tree level mangrove vegetation is dominated by Rhizophora apiculata (INP) of 92.26, while the seedlings rate was dominated by Rhizophora apiculata (INP) of 82.89. At the IV station, tree level mangrove vegetation is dominated by Sonneratia alba (INP) of 93.77, while the seedlings rate was dominated by Avicennia marina (INP) of 103.04. At station V, tree level mangrove vegetation is dominated by Bruguira gymnorrhyiza (INP) amounted to 115.31, while the seedlings rate was dominated by Rhizophora stylosa (INP) of 136.62.