71 research outputs found
Penempelan Larva Siput Laut (Haliotis varia) : Suatu Percobaan di Laboratorium
No full textSettlement of abalone (Haliotis varia) focusing on substrate quality and larval behavior were studied. Four types of substrate, shell and mucous, algae Gracilaria sp and Halimeda sp, and plastic petri-dish were used to test whether the larva might respond and settle on those substrates. At the same time, the mortality of larvae was also determined during the settlement. Without petri-dish, substrate of shell and mucous, algae, as well as polyvinyl chloride (PVC) plate were tested to find out substrate preferences when settlements occured. The result showed that variation of substrata, shell and mucous, algae and plastic “petri-dish” possessed a stimuli responded by larva to settle. Shell and mucous as well as substrate algae were attractive among of substrata, since high of settlement on it were recorded. High larval mortality on shell and mucous as well as on substrata of algae were recorded. Substrate of shell and mucous and alga were favorable to substrata when settling. Several factors affecting settlement of larval abalone were discussed
Persentase tutupan dan struktur komunitas mangrove di sepanjang pesisir Taman Nasional Bunaken bagian utara
No full textTujuan dari penelitian ini adalah menghitung persentase tutupan mangrove dan mengetahui struktur komunitas mangrove. Penelitian ini dilakukan di sepanjang pesisir Taman Nasional Bunaken bagian Utara. Metode yang di gunakan dalam penelitian ini yaitu metode line transect dan metode hemisperichal photography. Data hasil penelitian ditemukan 6 jenis mangrove yaitu Sonneratia alba, Avicennia officinalis, Avecennia marina, Rhizophora apiculata, Rhizophora mucronata dan Bruguiera gymnorrhiza yang termasuk dalam 4 famili Sonneratiaceae, Avicenniaceae, Rhizophoraceae dan juga Bruguieraceae. Nilai tutupan kanopi mangrove yang tertinggi pada stasiun 2 (Meras) di transek 2 mencapai nilai 82,78% dan yang terendah pada stasiun 1 (Molas) di transek 1 yaitu 61,24%
STRUKTUR KOMUNITAS MANGROVE GAMLAMO, KECAMATAN JAILOLO, HALMAHERA BARAT, PROVINSI MALUKU UTARA
No full textMangrove is one of coastal plants that have many benefits both to the environment and society. Mangroves can be found growalong the coast and influenced by tides. This research conducted in Gamlamo Village, Jailolo Sub-district, West Halmahera Regency, North Maluku Province. The purposes of this study were to determine the mangrove community structure and identify mangroves species in Gamlamo Village. The method used in this research was line transect method. There are 3 stations established onthis research area and each station has two line transects, so the total line transect are six. Moreover, within each line transect five quadrants (10 x 10 cm2) were laid. This study found that at three stations in the research area, there were three mangrove species Rhizophora mucronata, Sonneratia alba and Bruguiera gymnorrhiza. The highest density value was found at station 2 of R. mucronata 0,36 ind/m2 and the relative density value was 60%. The highest frequency was found at station 2, belong to R. mucronata 1 ind/m2 and the relative value was 41,67%. The highest dominance wasfound at station 1 of S. alba 52,89 m2 and dominance relative 53,31%. For the highest important value index was at station 2, of R. mucronata with a value of 136,57% and the found at station 3 B. gymnnorrhiza. The highest diversity index (H’) 1,03 was found at station 1 while the lowest 0,95 was at station 2.Keywords: Gamlamo Village, Mangrove, Community Structur
Estimasi penyerapan karbon hutan mangrove Bahowo Kelurahan Tongkaina Kecamatan Bunaken
No full textHutan mangrove merupakan sumber daya alam daerah pesisir yang mempunyai banyak manfaat sangat luas baik secara ekologis, ekonomis, maupun sosial. Tujuan penelitian ini adalah mengestimasi potensi kandungan karbon (C) dan serapan karbondioksida (CO2) pohon mangrove Bahowo di Kelurahan Tongkaina Kecamatan Bunaken. Estimasi potensi biomassa, kandungan karbon, dan serapan karbondioksida pada pohon mangrove dilakukan dalam empat plot 10 x 10 m2 dengan jarak antar plot sejauh 50 m serta menggunakan persamaan allometrik. Setiap pohon yang ada dalam plot dicatat jumlah, jenis, dan diameternya. Hasil penelitian yang didapat menunjukan total biomassa adalah sebesar 433,69 ton/ha dan hasil estimasi kandungan karbon (C) serta serapan karbondioksida (CO2) sebesar 203,83 ton C/ha dan 748,07 ton CO2/ha
STRUKTUR KOMUNITAS MANGROVE DI KELURAHAN TAPUANG, KECAMATAN TAHUNA, KABUPATEN SANGIHE
No full textThe information about mangrove forest community structure in Tapuang village has never been reported. The location of the mangrove forest in this village is near to the settlements. Three line transects with 50 m distance were laid perpendicular to the shore. In each line transect, 5 quadrants (10 x 10 m2) were established. The data were analyzed using several parameters density, frequency, dominance, important index value and diversity. This study found 5 mangrove species namely Avicennia marina, Sonneratia alba, Sonneratia ovata, Rhizophora stylosa and Nypa fruticans. Avicennia marina was the most species found in each transects and had the highest density, frequency, and dominance values. The highest important value index (INP) was found in Avicennia marina in transect 2 with a INP value 183.80. Mangrove species diversity index for tree category in each transect was low (H'≤1) ranges from 0.99.Key Words: Tapuang Village, Mangrove, Community StructureÂ
ESTIMASI KANDUNGAN KARBON BIOMASA PNEUMATOFOR Avicennia marina
No full textMangrove forests play an important role in mitigating the effects of global warming as mangroves can absorbs and stores carbon therefor, mangrove plants including A. marina can act as carbon sinks. The study aim is to estimate the carbon content contained in A. marina pneumatophore biomass. The data was taken b using line transect method. The number of research stations are 3 stations contain 3 plots (10 x 10 m2) for each station. Samples were taken at low tide by established 3 microplots (50 x 50 cm2) in each 10 x10 m2 plots. The results showed that the highest biomass value was found at Station 3 of 0.49 Kg/m2, followed by Station 1 of 0.42 Kg/m2, and the least pneumatophore biomass value was found at Station 2 of 0.41 Kg/m2.  This finding is in line to the potenntial potential carbon content in pneumatophores where Station 3 has C content (0.08 Kg C/m2), dand 0.07 Kg C/m2 for both station 1 and 2 respectively. The average of C Contain in pneumatphores was 0.28 Kg C/m2. Keyword : Carbon Content, Biomass, Pneumatophores, Avicennia marin
Die moderne belydenisbeweging in Suid-Afrika - en Calvyn
No full textStarting with the Barmen Declaration of 1934, a new desire to confess the Christian faith in situations of political tension erupted worldwide, resulting in the formulation of new confessional statements. In South Africa a number of declarations and testimonies emanated from the struggle against apartheid. Not all these confessional statements had the same character and impact. The author of this article concentrates on the three most important documents which may have been influenced by Barmen: The Message to the People of South Africa (1968), the Belhar Confession (1982) and the Kairos Document (1985/6. He also refers to several other statements, including the document Geloof en protes (1987), which subscribes to apartheid as a matter of faith. The author concludes with a few critical remarks from a Calvinist point of view
Kajian Kesesuaian Lahan Ekowisata Mangrove Di Desa Arakan Kabupaten Minahasa Selatan Sulawesi Utara
No full textStudy Of Land Suitability For Mangrove Ecotourism In Arakan Village, Minahasa Selatan District, North Sulawesi The purpose of this study was to determine community structure, mangrove canopy cover and land suitability of mangrove ecotourism. This study used the line transect method for mangrove community structure, interviews for questionnaires and hemispherical photography for the percentage of mangrove cover. The results of the study on mangrove community structure showed that The highest important value index is found in transect 3, namely R. stylosa with value of 292,935 and the lowest on transect 3 is A. officinalis with a value of 7.065. For the suitability of mangrove ecotourism land shows that all transects belong to the suitable category with value of 55.74% on transect 1, 65.57% on transect 2, 68.85% on transect 3, 63.93% on transect 4 and 68.85% on transect 5.Keywords: Mangrove, Ecotourism, Arakan Village Tujuan dari penelitian ini adalah untuk mengetahui struktur komunitas, tutupan kanopi mangrove dan kesesuaian lahan ekowisata mangrove. Penelitian ini menggunakan metode line transek terhadap struktur komunitas mangrove, wawancara untuk kuisioner dan hemispherical photography untuk persentase tutupan mangrove. Hasil penelitian struktur komunitas mangrove yaitu indeks nilai penting tertinggi terdapat pada transek 3 jenis R.stylosa 292.935 dan terendah pada transek 3 jenis A.officinalis 7.065. Untuk kesesuaian lahan ekowisata mangrove bahwa pada semua transek masuk kategori sesuai dengan nilai kesesuaian transek 1 55.74%, transek 2 nilai 65.57%, transek 3 nilai 68.85%, transek 4 nilai 63.93% dan transek 5 nilai 68.85%.Kata kunci: Mangrove, Ekowisata, Desa Arakan
KONDISI PADANG LAMUN DI PERAIRAN SEKITAR DESA BULO KECAMATAN WORI KABUPATEN MINAHASA UTARA
No full textPenelitian ini bertujuan untuk mengetahui kondisi padang lamun yang berada di Perairan Sekitar Desa Bulo Kecamatan Wori Kabupaten Minahasa Utara. Lamun (Seagrass) adalah salah satu tumbuhan ada di ekosistem atau lingkungan laut. Lamun merupakan tumbuhan tingkat tinggi (Anthophyta) yang hidup dan berkembang di lingkungan laut serta berkembang biak secara generatif dan vegetatif. Lamun adalah tumbuhan berbunga (Angiospermae) yang hidup dan berkembang di kolom perairan yang dangkal. Tumbuhan lamun ini memiliki akar, batang yang menjalar yang disebut (Rhizome), daun, bunga, dan buah. Padang lamun yaitu tumbuhan yang menutupi suatu areal pesisir laut dangkal pada pasang surut intertidal maupun subtidal yang dapat terbentuk oleh satu spesies lamun atau lebih dengan kerapatan jarang atau padat. Metode yang dilakukan dalam pengambilan data menggunakan metode line transek kuadrat yang terdiri dari transek dan frame yang berbentuk kuadrat. Hasi dari penelitian ini menemukan kondisi atau tutupan lamun di stasiun I dengan rata-rata 10%, pada stasiun II 10,34%, dan pada stasiun III 11,25, dengan rata-rata persentase tutupan dari ketiga stasiun yaitu 10,53% dapat di simpulkan lamun di Perairan Desa Bulo dalam dikategorikan dalam kondisi miskin/jarang. jenis lamun yang di temukan Enhalus acoroides.
Kata kunci: Desa Bulo, Kondisi, Lamun
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