Genetic diversity of Pongamia pinnata (Millettia pinnata, aka. malapari) populations in Java Island, Indonesia

Abstract

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.

Microplastics Patch Based on Hydrodynamic Modeling in The North Indramayu, Java Sea

“…Current can be generated by tidal propagation and wind force [17]. Current circulation of Biawak Islands coastal waters in the Java Sea is dominated by tidal forcing [18]. In this research, a comparison of tidal current velocities and wind-forced current velocities is conducted in order to determine the dominant force of microplastics transport in the Java Sea.…”

Kondisi Tutupan Terumbu Karang di Pulau Panjang Taman Nasional Kepulauan Seribu, DKI Jakarta

“…Rehabilitasi terumbu karang dibutuhkan melihat pentingnya ekosistem ini terhadap banyak aspek, keberlangsungan hidup biota yang berasosiasi didalamnya yang paling utama (van Oppen et al, 2015). Pembangunan wilayah pesisir dan pulaupulau kecil harus memperhatikan faktor konektivitas larva karang (Fitriadi et al, 2017) sehingga tidak menganggu proses keberlangsungan terumbu karang secara alami.…”

Model Numerik Lintasan Sebaran Larva Karang Di Kandidat Lokasi Penempatan Bekas Struktur Anjungan Migas Lepas Pantai (Rig To Reef)

“…Tipe pasang surut perairan Bontang merupakan tipe pasang surut campuran condong semidiurnal, dengan kecepatan arus rata-rata pesisir sepanjang muara 0,4-0,55 m/s dengan kecepatan arus permukaan dekat selat Makassar mencapai 1,15 m/s (Utami, 2016). Pergerakan larva karang yang merupakan plankton dipengaruhi terutama oleh pergerakan arus pasang surut yang merupakan arus bolak balik untuk menempel di substrat yang sesuai (Pranowo et al, 2004;Fitriadi et al, 2017;Nurulita et al, 2018). Waktu yang diperlukan planula untuk menempel di substrat yang sesuai 4-7 hari setelah pembuahan dan dapat bertahan mencapai 26 -78 hari di perairan jika belum menemukan substrat dan kondisi lingkungan yang sesuai (Lugo-Fernandez et al, 2001;Fitriadi et al, 2017).…”