Abstract. Ginantra IK, Muksin IK, Suaskara IBM, Joni M. 2020. Diversity and distribution of mollusks at three zones of mangrove in Pejarakan, Bali, Indonesia. Biodiversitas 21: 4636-4643. The diversity of mangrove species in mangrove zonations on the coast of Pejarakan plays an important role in the existence of faunal diversity, including those from mollusks. Mollusks are the dominant phylum associated with mangrove habitats, in addition to the species of the Crustacean subphylum. This research aimed to determine the diversity of mollusks and their distribution patterns in three mangrove zones in Pejarakan, Buleleng District, Bali Province, Indonesia. Data collection was conducted by establishing sampling plots across three mangrove zones, i.e. seaward zone, middle zone, and landward zone. There were 23 sampling plots in total with size of each plot was 1x1m. The species and number of individuals of each species of mollusks were recorded in each quadrat plot. The diversity of mollusks was calculated using the Shannon-Wiener index, evenness index, and dominance index, while the pattern of distribution of mollusks was measured using the Morisita index. The results of the study found 27 species of mollusks, consisting of 19 species from Gastropods group, 7 species from Bivalvia group and 1 species from Polyplacophora (chiton). The seaward zone showed the highest species diversity, while the landward zone had the lowest. Terebralia palustris had the highest abundance with 217 individuals/m2 and was distributed in the three mangrove zones. Planaxis sulcatus showed the highest abundance (87 ind./m2) in the seaward zone, and Telescopium telescopium showed a fairly high abundance and were distributed in the mid zone and the landward zone. In general, mollusks in the mangrove area of Pejarakan was distributed in a group/clustered pattern. The data from this research can serve as a reference in mangrove forest conservation efforts and mangrove forest used for ecotourism.

This study aims to identify the species of mangrove constituents and determine the zonation of the growing community of mangrove plants from the seaward to the landward zone, of the Nature Conservation Forum (NCF) Putri Menjangan coastal Pejarakan village Buleleng from July to October 2017. Identification of mangrove plant species based on the following characteristics: habitus, root type, fruit shape, inflorescence, leaf shape and leaf arangement. Zoning of mangrove grown is determined from vegetation analysis conducted in 3 zones (front zone, middle zone and back zone) with quadrat method, the area of each square is 20 m x 20 m. Parameters specified in each kwadrat are the density, dominance and frequency of presence of each species. Zoning of mangrove community is determined based on the important value of mangrove plant species. The diversity of the mangrove community is calculated by the Shanon-Wiener Diversity Index. The results of the study identified 13 species of true mangrove plants (mangrove) and 14 mangrove mangrove associates. The dominant species are Sonneratia alba (important value / iv is 98.19), Lumnitzera racemosa (iv. is 40.75), Rhizophora apiculata (iv.is 35.53), Rhizophora mucronata (iv. 33.02), Ceriops decandra (iv.23.61) and Avicennia marina (iv. 22.22). The diversity index of mangrove species (H) is 2.07, then it is considered good. The pattern of growing mangrove plants in coastal Pejarakan Buleleng, in general follow the natural pattern of mangrove zonation. Typical characteristics and patterns of growing mangrove zonation become interesting attractions and reference for mangrove area managers in ecotourism development and efforts to conserve mangrove forests.

Abstract. Ginantra IK, Muksin IK, Joni M. 2021. Crab diversity as support for ecotourism activities in Pejarakan Mangrove Forest, Buleleng, Bali, Indonesia. Biodiversitas 22: 4139-4145. This research aims to determine the diversity of crabs to support ecotourism activities in the coastal mangrove forest of Pejarakan Buleleng. Sampling of crabs was carried out using the square method, as many as 23 squares were spread over three mangrove zones, namely the front zone, the middle zone, and the rear zone. The number of individual crustacean species in each square plot was counted. Crab identification is based on morphological characters (shell color, claw shape, body-color, body size). Habitat use activities are observed directly. The diversity of crabs was calculated using the Shannon-Wiener diversity index. The results showed that in the coastal mangrove area of Pejarakan Buleleng, there were 11 species of crabs (9 species of crabs and 2 species of hermit crabs). Species diversity is in the medium category (index 2.25) and evenness index is high (E = 0.93, mangrove conditions are stable). The seaward mangrove zone shows a higher diversity of crab species than the middle zone and the rear zone. The species of crabs that are quite abundant in the three zonings are Uca vocans, Chiromanthes sp., and Coenobita sp. Characteristics of crabs, activities, habitat use in mangrove zoning are attractions for ecotourism activities.

Research has been carried out on bird diversity to support ecotourism attractions in the mangrove area of Lembongan Island. The research was conducted in April - August 2021. The focus of this research is the identification, description of bird species and the use of habitats for bird activities. To achieve this goal, the following steps were taken: Identification of bird species based on morphological characteristics, determining the abundance of bird species using the point count method, determining bird activity at each ecosystem site of mangroves with ad libitum sampling method. Bird species diversity was determined by the Shannon-Wiener index. The results of the study found 32 species of birds belonging to 26 families. Most of the birds found were terrestrial birds with 21 species, and water birds (shore birds) with 11 species. Overall, the diversity of bird species in the mangrove ecosystem is in the high category (diversity index 3.03) and the species evenness index is high (evenness index 0.87). The types of vegetation used by birds at the 7 research sites were mangrove vegetation, mangrove associations and dry land vegetation. The presence of birds, bird conservation status, bird activities, habitat use by birds in mangrove habitats are attractive attractions for ecotourism.

Capung merupakan serangga yang berperan penting dalam keseimbangan ekosistem, berperan sebagai bioindikator dan predator. Sebagian besar fase hidupnya berada di air dalam bentuk larva. Beberapa jenis capung menempati tipe habitat perairan yang spesifik. Penelitian ini bertujuan untuk mengetahui keanekaragaman jenis capung dan pemanfaatan nimfanya sebagai nilai tambah pendapatan di persawahan Bendungan Latu Abiansemal . Metode penelitian yang digunakan adalah metode deskriptif dengan cara koleksi langsung menggunakan jaring serangga (insect net) untuk diidentifikasi. Hasil penelitian menunjukkan bahwa jumlah spesies capung yang ditemukan di sekitar Bendungan Latu sebanyak 7 spesies termasuk kedalam 2 famili dengan  kemelimpahan relatif Orthetrum Sabina (47%), Pantala flavescens(44%), Neurothermis terminate (4%), Agriocnemis femina (2%), Neurothemis ramburii, Orthetrum chrysis dan Aethriamanta brevipennis masing masing 1%. Pola penyebaran capung  4 spesies mengelompok dan 3 spesies acak. Indeks keanekaragaman capung sangat rendah (H=1,04) dan pemanfaatan nimfa capung oleh petani digunakan sebagai lauk pauk untuk dijual serta penjualan nimfa capung hidup untuk pemenuhan kebutuhan taman capung di Desa Kemenuh Kabupaten Gianyar.   Keywords: bioindikator,  Orthetrum ,  Pantala, Neurothemis, Agriocnemis