Coral recruitment on concrete blocks at Gosong Pramuka, Kepulauan Seribu, Jakarta

Abstract

The current research was conducted to study the coral recruitment on concrete blocks at Gosong Pramuka, in Kepulauan Seribu. The concrete blocks were observed based on the wave exposure, i.e. the exposed area and sheltered area. A total of 247 coral recruits colonies was recorded on concrete substrates in Gosong Pramuka. The number of coral colonies in the exposed area (210 colonies) was higher than in the sheltered area (37 colonies). Coral recruit density in the exposed area was 1.37 colony/m2 and in the sheltered area was 0.23 colony/m2. A total of four genera was observed in these areas (Acropora, Porites, Montipora, and Pavona). The branching Acropora colonies were predominant for both areas, while encrusting non-Acropora was primarily found in the exposed area and massive non-Acropora was the major colonies in the sheltered area. The coral size of branching and encrusting Acropora in the sheltered area was significantly bigger than in the exposed area (P <0.05). In the exposed area, corals are found in the center of the concrete, but in the sheltered area, they are located in the corner and the edge of the concrete.

Hard Coral (Scleractinia) Recruitment Based on the Geomorphology Zone in Bintan Island Waters, Riau Islands

“…Data rekrutmen karang yang diperoleh selanjutnya dikelompokkan berdasarkan genus, bentuk pertumbuhan (life form) dan sebaran ukuran. Selanjutnya dilakukan analisis uji t untuk melihat pengaruh perbedaan geomorfologi di setiap lokasi penelitian terhadap kelimpahan rekrutmen karang berdasarkan genus, bentuk pertumbuhan dan ukuran (Subhan et al, 2020).…”

“…Berdasarkan taxa, ditemukan juvenil karang sebesar 21 genera dari 12 famili yang didominasi oleh genus Fungia (karang jamur) di perairan Sulawesi Tenggara (Palupi & Rahmadani, 2018). Hasil penelitian Subhan et al (2020) terdapat 210 koloni karang rekrutmen yang ditemukan pada perairan terbuka dan 37 koloni karang rekrutmen yang ditemukan pada perairan terlindung di kawasan perairan Gosong Pramuka, Kepulauan Seribu.…”

Contrasting coral community structures between natural and artificial substrates at Koh Tao, Gulf of Thailand

“…Fitzhardinge and Bailey-Brock, 1989;Schuhmacher, 2002;Lam, 2003;Arnold and Steneck, 2011;Hylkema et al, 2021). Many such substrates have also been used in the construction of artificial reefs, some of which in turn have been used in the study of coral recruitment (Ng et al, 2017;Higgins et al, 2019;Subhan et al, 2019). However, there is growing evidence for significant divergences in the community structure of corals recruiting onto artificial reefs, and those of nearby natural reefs (Budd and Pandolfi, 2010;Kramer et al, 2019;Hill et al, 2021).…”

Coral Recruitment on Artificial Patch Reefs Deployed in The Marginal Reefs: Effect of Multilevel Substrate on Density of Coral Recruit

“…The main objective of coral reef restoration efforts using artificial substrate is to provide a substrate for coral settlement and coral transplantation (Meesters et al, 2015;BostrÖm-Einarsson et al, 2020). However coral recruitment on artificial reefs deployed in the marginal environment waters were not satisfying as indicated by the low density of recruited coral (Chui & Ang 2017;Otãno-Cruz et al, 2019;Subhan et al, 2019). Moreover, many experiments of coral recruitment in the marginal waters using settlement plate also resulted in low recruitment and mostly composed by the pioneer corals i.e., Acroporid and Pocilloporid (Faiz et al, 2017;Purnomo & Afiati 2018;Lubis et al, 2018).…”