Fitriadi CA, Dhahiyat Y, Purba NP, Harahap SA, Prihadi DJ. 2017. Coral larvae recruitment based on oceanography condition in Biawak Islands, West Java,. This research aimed to know the recruitment pattern of planula in the Biawak Island. The dispersion of planula and corals recruitment as an important factor to determine the distribution of the adult corals. The spawning and brooding are the beginning processes of planula dispersion. Dispersion factors are highly influenced by water environment factors. The main factor in planula dispersion is sea currents, wind, tide, and bathymetry. The circulation of sea currents on Biawak Islands waters is influenced by the tidal movement. The results of research showed that Biawak Islands waters have mixed tide prevailing semidiurnal type of tidal movement. Currents of Biawak Islands waters moved from the northern toward the southern with a range of speed between 0.045-0.075 m/s on northeast and south and for west and north range of speed of sea currents are between 0.015-0.195 m/s, the sea currents movement of Biawak Islands waters was dominated by tidal movement. Biawak Islands have varying wind speed, the most direction of wind moved to northwestern toward southeastern by predominance speed 4.8-7.2 m/s. The results of research showed that planula on the Biawak Island moved to northern and northeastern at high tide and then moved to southern and southeastern at a low ebb with the furthest movement of planula on the Biawak Island was 2.2 km. The furthest movement of planula on the Gosong Island was 1.66 km and planula dispersed to the east and west region of Gosong Island, on the Cendikia Island planula dispersed to northern and eastern with the furthest movement of planula on the Cendikia Island was 0.44 km. Based on the movement of planula can be concluded that source of coral reefs on the Gosong Island derived from the coral reefs on the Biawak Island.
This research aims to determine the ecosystems connectivity by observing the distribution of inter-island mangrove propagules in the territorial waters of Biawak Island. The data used are wind, tidal, and bathymetry of 2018. They are modeled according to the propagules’ weight and the particle trajectory module. The results showed that the entire propagules (Rhizopora sp, Sonneratia sp, and Brugueira sp) dominantly moved to the west and southeast. They are carried by the currents that are influenced by the west and east monsoon. The propagules of Rhizopora sp moves from east to southeast, Sonneratia sp moves from east to south, and propagules Brugueira sp moves from west to north. In addition to oceanographic factors, other parameters that can influence the pattern of propagules movement is the propagule’s mass; the lighter it is, the easier it is to be carried away.
Instrumen Lagrangian telah banyak digunakan untuk pengumpulan data arus laut dan observasi di perairan Indonesia membutuhkan data yang langsung dapat diketahui (real time). Kajian ini menekankan pada pengembangan GPS Drifter Combined (GERNED) dari sisi desain dan sistem pengukuran. Hasil pengujian menunjukkan bahwa GERNED dapat digunakan di danau, perairan dangkal, dan laut terbuka. Konstruksi terdiri dari bahan akrilik, Polyethylene, dan aluminium. Desain konstruksi terdiri dari bagian atas sebagai penutup dan juga tempat sensor udara dan lampu indikator, bagian tengah yang merupakan pusat mikro-kontroller, catu daya, sensor-sensor, penyimpanan data manual dan pengiriman data via satelit. Biaya yang dibutuhkan untuk membuat alat ini sekitar 15.000.000 (lima belas juta rupiah) dengan biaya terbesar adalah kontrol pengiriman data. Pada bagian bawah merupakan baling-baling statik. Pengujian yang dilakukan di laboratorium untuk melihat posisi lokasi sudah menunjukkan data yang sama dengan data lapangan sedangkan untuk pengujian lapangan yang dilakukan di pulau Untung Jawa menunjukkan bahwa arah dan pergerakan GERNED sama dengan pergerakan float tracking umumnya.
Abstract. Vatani L, Hosseini SM, Akbarinia M, Shamsi S. 2017. Natural woody species biodiversity after Cypress (Cupressus sempervirens var. horizontalis) reforestation in Hyrcanian Forest,. The present study was conducted to investigate the impact of Cypress (Cupressus sempervirens var. horizontalis) reforestation (15 years old ) on woody species diversity comparison natural Hyrcanian forests. 9 sample plots with 20 × 20m area were taken in each stand by a random systemic statistical method and also control area, then natural regeneration number of woody species were measured. Shannon-Wiener for diversity index, Mechanic for richness index and Simpson for evenness index were calculated to evaluate species biodiversity, using Ecological Methodology and SPSS software. The results showed that sixteen tree and shrub species were appeared in Cypress understory naturally, that some of the species were rare. There was no significant difference between the diversity and richness index obtained for Cypress reforestation and natural forest. Regarding the rate of evenness, only in one area was found a significant difference was observed between Cypress reforestation and natural forest that in reforestation was more than natural forest (p<0.05). Regarding the results obtained on the study, Cypress reforestation did not reduce the woody plant biodiversity until the age of fifteen years old and findings of this investigation suggested that the conditions under the Cypress canopy might be suitable for the presence of some woody species, 15 years after reforestation.
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