Ucu Arbi
Indonesian Institute of Sciences, Marine Biology, Faculty Member
Fluctuations in Megabentos Conditions in Ternate waters, North Maluku The coral reef was a habitat for several groups of biota that live in this ecosystem. Some species or group species of benthic fauna are known to be ecologically... more
Fluctuations in Megabentos Conditions in Ternate waters, North Maluku The coral reef was a habitat for several groups of biota that live in this ecosystem. Some species or group species of benthic fauna are known to be ecologically important and others are economically important so that they can be used as indicators to assess reef health. Research on megabenthic fauna in Ternate and its surrounding waters, North Maluku, was carried out in 2012, 2015, 2016, 2017 and 2018 at fourteen permanent stations. The purpose of this study was to determine the fluctuations in several megabenthic faunae temporarily. Data were collected using the modified Belt Transect Method, namely Benthos Belt Transek method. Eight species or groups of megabenthic fauna in the coral reef have been observed. The highest distribution and abundance of megabenthic fauna was coral polyps eating-snail of Drupella spp. The species wealth index decreased from 2012 to 2017 (1.17 to 1.05) but experienced an increase in 2018 (to 1.29). The relatively high dominance found in the megabenthic fauna community was observed in 2015, 2016 and 2017, while in 2012 and 2018 it had relatively low dominance. The megabenthic fauna community observed in 2012 and 2018 has relatively high diversity, whereas in 2015, 2016 and 2017, the diversity is relatively low. The megabenthic fauna community observed in 2012 and 2018 has spread evenly, while in 2015, 2016 and 2017, the relative prevalence of fauna is relatively uneven. Abstrak Terumbu karang merupakan habitat bagi beberapa kelompok biota yang hidup di dalamnya. Beberapa spesies atau kelompok spesies bentos diketahui bernilai ekologis pentingdan yang lainnya bernilai ekonomis penting sehingga dapat dijadikan sebagai indikator untuk menilai kesehatan terumbu. Penelitian fauna megabentos di perairan Ternate dan sekitarnya, Maluku Utara dilakukan pada tahun 2012, 2015, 2016, 2017 dan 2018 pada empat belas stasiun permanen. Tujuan penelitian ini adalah untuk mengetahui fluktuasi beberapa indeks ekologi megabentos dari tahun ke tahun. Pengambilan data menggunakan metode Benthos Belt Transect yang dimodifikasi dari Belt Transect Method. Sebanyak delapan kelompok jenis atau kelompok jenis megabentos pada perairan terumbu karang telah diamati. Sebaran dan kelimpahan megabentos tertinggi adalah siput pemakan polip karang Drupella spp. Indeks kekayaan spesies mengalami penurunan tahun 2012 hingga 2017 (1,17 menjadi 1,05), namun mengalami peningkatan pada tahun 2018 (menjadi 1,29). Dominansi yang relatif tinggi dijumpai pada komunitas megabentos yang teramati pada tahun 2015, 2016 dan 2017, sedangkan pada tahun 2012 dan 2018 memiliki dominansi yang relatif rendah. Komunitas megabentos yang teramati pada tahun 2012 dan 2018 memiliki keanekaragaman yang relatif tinggi, sedangkan pada tahun 2015, 2016 dan 2017 berkeanekaragaman relatif rendah. Komunitas megabentos yang teramati pada tahun 2012 dan 2018 memiliki kemerataan fauna yang relatif merata, sedangkan pada tahun 2015, 2016 dan 2017 memiliki kemerataan fauna yang relatif tidak merata.
Research Interests:
Pesisir selatan Gunung Kidul memiliki tipe ekosistem seperti kebanyakan pantai di sepanjang pantai selatan Pulau Jawa, yaitu memiliki kondisi yang ekstrim, dengan energi tinggi yang berupa gelombang besar dan ekosistem berbatu cadas.... more
Pesisir selatan Gunung Kidul memiliki tipe ekosistem seperti kebanyakan pantai di sepanjang pantai selatan Pulau Jawa, yaitu memiliki kondisi yang ekstrim, dengan energi tinggi yang berupa gelombang besar dan ekosistem berbatu cadas. Beberapa kelompok moluska diketahui memiliki daya adaptasi yang tinggi terhadap kondisi lingkungan yang ekstrim tersebut. Penelitian fauna moluska di pesisir selatan Gunung Kidul, Daerah Istimewa Yogyakarta telah dilakukan pada bulan Januari dan Februari 2010. Tujuan dari penelitian ini adalah untuk mendapatkan gambaran awal mengenai jenis-jenis Gastropoda yang beradaptasi pada ekosistem berenergi tinggi di perairan Gunung Kidul. Penelitian dilakukan di zona intertidal dengan menggunakan metode transek acak dengan batasan waktu pada dua belas lokasi. Hasil penelitian, diperoleh sebanyak 64 jenis Gastropoda, dan sebagian besar jenis Gastropoda yang ditemukan tersebut merupakan jenis-jenis moluska yang khas pada daerah dengan gelombang besar. Gastropoda yang ditemukan pada ekosistem bernergi memiliki adaptasi yang baik terhadap hempasan ombak.
Research Interests:
Research Interests:
1. In the planning of marine protected areas for the conservation of coral reef systems, it is important to be able to distinguish between certain bioregions, i.e. regions with distinct species assemblages. This was done off western... more
1. In the planning of marine protected areas for the conservation of coral reef systems, it is important to be able
to distinguish between certain bioregions, i.e. regions with distinct species assemblages. This was done off western
Halmahera (Moluccas, Indonesia), where three such bioregions were distinguished based on species inventories of
41 coral reef sites.
2. The relative value of species belonging to different trophic groups was examined with regard to their possible
role as indicators for these three regions. The study focused on ascidians (Ascidiacea), macroalgae, mushroom
corals (Fungiidae), and a selection of coral-associated gastropods (Epitoniidae and Coralliophilidae).
3. The best results for the detection of bioregions were obtained when datasets of all four trophic groups were
pooled. When comparing the taxa and their indicator values, ascidians were the most suitable, followed by
macroalgae, corals and gastropods with 98, 83, 71 and 66 % certainties, respectively. The occurrence of 17
species correlated strongly with the bioregions, which therefore were identified as potential indicator species
consisting of 13 ascidians, three macroalgae, and one mushroom coral. These data suggest that ascidians have a
significant value as indicators to evaluate bioregion boundaries.
4. Water quality measurements indicated that salinity and turbidity could be responsible for at least part of the
differences between the species assemblages in the three bioregions.
to distinguish between certain bioregions, i.e. regions with distinct species assemblages. This was done off western
Halmahera (Moluccas, Indonesia), where three such bioregions were distinguished based on species inventories of
41 coral reef sites.
2. The relative value of species belonging to different trophic groups was examined with regard to their possible
role as indicators for these three regions. The study focused on ascidians (Ascidiacea), macroalgae, mushroom
corals (Fungiidae), and a selection of coral-associated gastropods (Epitoniidae and Coralliophilidae).
3. The best results for the detection of bioregions were obtained when datasets of all four trophic groups were
pooled. When comparing the taxa and their indicator values, ascidians were the most suitable, followed by
macroalgae, corals and gastropods with 98, 83, 71 and 66 % certainties, respectively. The occurrence of 17
species correlated strongly with the bioregions, which therefore were identified as potential indicator species
consisting of 13 ascidians, three macroalgae, and one mushroom coral. These data suggest that ascidians have a
significant value as indicators to evaluate bioregion boundaries.
4. Water quality measurements indicated that salinity and turbidity could be responsible for at least part of the
differences between the species assemblages in the three bioregions.