scholarly journals An assessment of small islands coral cover and coral-reef fish diversity at Oba Sub-district, Halmahera Island

2021 ◽  
Vol 890 (1) ◽  
pp. 012060
Author(s):  
F Ismail ◽  
N Akbar ◽  
I Tahir ◽  
R E Paembonan ◽  
I Marus ◽  
...  
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Cover ◽  
Coral Growth ◽  
Systematic Sampling ◽  
Fish Diversity ◽  
Live Coral ◽  
Small Islands ◽  
Study Results ◽  
High Diversity

Abstract Study on the percentage of coral cover four small islands of Oba Sub-district, Halmahera Island of North Maluku Utara Province was carried out in April 2021.The four small islands of Oba Sub-district studied are Woda Island, Raja Island, Tamin Island, and Guratu Island. The study applied systematic sampling method that included collecting coral reef data using UPT (Underwater Photo Transect) method and coral fish data collection using visual census method. Study results showed that live coral coverage of reefs on the four small islands of Oba Sub-district had the highest value of 5.415% and the lowest value of 4.29%. There was positive relationship between coral growth form diversity and fish diversity. High diversity of coral growth forms was significantly related to high diversity of target reef fish.

scholarly journals Benthic structure drives butterflyfish species composition and trophic group abundance

2019 ◽  
Author(s):  
Miguel Barbosa ◽  
Neil Coupland ◽  
Clara Douglas ◽  
Ellen Harrison ◽  
Kelly M James ◽  
...  
Keyword(s):  
Species Richness ◽  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Fish Assemblages ◽  
Coral Cover ◽  
Food Sources ◽  
Fish Diversity ◽  
Live Coral ◽  
Benthic Composition

Corals provide structure and food sources vital for the maintenance of coral reef fish diversity. However, coral reefs are currently under threat from climate change, which has led to the largest recorded loss of live coral. The loss of live coral, and corresponding shift in reef benthic composition, are predicted to impact the abundance and composition of coral reef fish species and communities. In this study, we investigate the effect of changes in reef benthic composition (eg. live coral, dead coral, algae), on the diversity and composition in an assemblage of butterflyfish species, in Faafu Atoll in the Maldives after the 2016 bleaching event. We show that differences in community composition of butterflyfish are associated to benthic structure, reflecting species feeding preferences. Interestingly, however, we also show that lower coral cover is not associated to lower abundance and species richness of butterflyfish. Our results suggest that maintenance of coral reef structure after a disturbance provides key microhabitats to accommodate non-corallivorous butterflyfish, thus maintaining abundance and species richness. Overall our study provides support for regulation of richness and abundance of coral reef fish assemblages to short term changes in coral reef benthic composition after disturbance via turnover in composition.

scholarly journals Benthic structure drives butterflyfish species composition and trophic group abundance

2019 ◽  
Author(s):  
Miguel Barbosa ◽  
Neil Coupland ◽  
Clara Douglas ◽  
Ellen Harrison ◽  
Kelly M James ◽  
...  
Keyword(s):  
Species Richness ◽  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Fish Assemblages ◽  
Coral Cover ◽  
Food Sources ◽  
Fish Diversity ◽  
Live Coral ◽  
Benthic Composition

Corals provide structure and food sources vital for the maintenance of coral reef fish diversity. However, coral reefs are currently under threat from climate change, which has led to the largest recorded loss of live coral. The loss of live coral, and corresponding shift in reef benthic composition, are predicted to impact the abundance and composition of coral reef fish species and communities. In this study, we investigate the effect of changes in reef benthic composition (eg. live coral, dead coral, algae), on the diversity and composition in an assemblage of butterflyfish species, in Faafu Atoll in the Maldives after the 2016 bleaching event. We show that differences in community composition of butterflyfish are associated to benthic structure, reflecting species feeding preferences. Interestingly, however, we also show that lower coral cover is not associated to lower abundance and species richness of butterflyfish. Our results suggest that maintenance of coral reef structure after a disturbance provides key microhabitats to accommodate non-corallivorous butterflyfish, thus maintaining abundance and species richness. Overall our study provides support for regulation of richness and abundance of coral reef fish assemblages to short term changes in coral reef benthic composition after disturbance via turnover in composition.

scholarly journals Benthic structure drives butterflyfish species composition and trophic group abundance

2019 ◽  
Author(s):  
Miguel Barbosa ◽  
Neil Coupland ◽  
Clara Douglas ◽  
Ellen Harrison ◽  
Kelly M James ◽  
...  
Keyword(s):  
Species Richness ◽  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Fish Assemblages ◽  
Coral Cover ◽  
Food Sources ◽  
Fish Diversity ◽  
Live Coral ◽  
Benthic Composition

Corals provide structure and food sources vital for the maintenance of coral reef fish diversity. However, coral reefs are currently under threat from climate change, which has led to the largest recorded loss of live coral. The loss of live coral, and corresponding shift in reef benthic composition, are predicted to impact the abundance and composition of coral reef fish species and communities. In this study, we investigate the effect of changes in reef benthic composition (eg. live coral, dead coral, algae), on the diversity and composition in an assemblage of butterflyfish species, in Faafu Atoll in the Maldives after the 2016 bleaching event. We show that differences in community composition of butterflyfish are associated to benthic structure, reflecting species feeding preferences. Interestingly, however, we also show that lower coral cover is not associated to lower abundance and species richness of butterflyfish. Our results suggest that maintenance of coral reef structure after a disturbance provides key microhabitats to accommodate non-corallivorous butterflyfish, thus maintaining abundance and species richness. Overall our study provides support for regulation of richness and abundance of coral reef fish assemblages to short term changes in coral reef benthic composition after disturbance via turnover in composition.

scholarly journals CONDITION OF CORAL AND REEF FISH IN THE LOCATION OF FISH CATCHING USING DYNAMITE FISHING IN KAPOPOSANG WATER PARK AND THE SURROUNDING SEA

2020 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Mahmudin Mahmudin ◽  
Chair Rani ◽  
Hamzah Hamzah
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Cover ◽  
Low Cost ◽  
Fish Abundance ◽  
Live Coral ◽  
Coral Reef Ecosystem ◽  
Control Location ◽  
Target Fish ◽  
Reef Ecosystem

Dynamite fishing is one of the causes of damage to the coral reef ecosystem in Indonesia. Fishing activities using explosives (dynamite fishing) occur because of the desire of fishermen to get a lot of catch with low cost in a short time. Kapoposang Water Park (WP) is a region rich in marine biological resources. However, dynamite fishing activities which are still found within the area have caused the coral reef ecosystem to be severely damaged. The results showed a lower difference in the percentage of live coral cover at dynamite fishing locations (DF1, DF2) compared to control locations (K1, K2). In addition, the highest average values of coral fish abundance were found at locations K1, DF1, and DF2. Conversely, the results of the analysis found the lowest fish abundance at the K2 location. Different from the average number of reef fish species that were higher at the control location (K1, K2) compared to dynamite fishing locations (DF1, DF2). For the target fish biomass there is no real difference between the control location and dynamite fishing.

scholarly journals Keanekaragaman dan Biomassa Ikan Karang serta Keterkaitannya dengan Tutupan Karang Hidup di Perairan Manggis, Kabupaten Karangasem, Bali

2018 ◽  
Vol 5 (2) ◽  
pp. 164
Author(s):  
I Made Raditya Putra ◽  
I Gusti Ngurah Putra Dirgayusa ◽  
Elok Faiqoh
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Coral Cover ◽  
Total Biomass ◽  
Live Coral ◽  
Strong Positive Correlation ◽  
Living Coral ◽  
Positive Correlation ◽  
Live Coral Cover

The existence of coral reef fish is closely related to the availability of coral reef resource as a habitat. Coral reef fish is a biota that has a fascination with a variety of color patterns and fascinating. Differences in coral cover conditions will affect the abundance of coral reef fish, especially those with strong linkages to living corals. This research was conducted in June - August 2017 by using line intercept transect (LIT) method for coral cover percentage and visual census method for biodiversity and biomass of coral reef fish with 3 research stations in Manggis waters, Karangasem. From the research results, it shows that the diversity index ranged between 2.54 - 2.70 which means the diversity of coral reef fish in the medium category and the stability of the community is in the medium. Furthermore, total biomass of coral reef fish ranged between 186,17 - 1692,08 kg / ha. The results stated that the percentage of live coral cover in Manggis waters ranged from 3.83% to 12.44% which means that live coral cover is categorized as bad. A very strong positive correlation between living coral conditions and coral reef fish biomass was 92.42%. Meanwhile, the relationship between living coral conditions and the diversity of coral reef fish had a strong positive correlation of 65.4%. The diversity of coral reef fish in waters is not only caused by live coral cover; however, it is caused by coral reef ecosystems that are associated in the bottom of the waters.

scholarly journals Condition of coral reef in Batee Island waters, Peukan Bada Sub-District, Aceh Besar

DEPIK ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 115-119
Author(s):  
Maria Ulfah ◽  
Saiful Mahlil ◽  
Muhammad Nasir ◽  
Sayyid Afdhal El Rahimi ◽  
Syahrul Purnawan ◽  
...  
Keyword(s):  
Coral Reef ◽  
Coral Cover ◽  
Marine Biota ◽  
Live Coral ◽  
Small Islands ◽  
Live Coral Cover ◽  
Coral Reef Ecosystems ◽  
The Indian Ocean ◽  
Average Condition ◽  
Line Intercept

Batee Island is one of the small islands in the Aceh Besar region and is uninhabited and directly faces the Indian Ocean. Batee Island's waters have the potential for marine biota, especially coral reef ecosystems, and other associated biotas. This study aims to determine the percentage and comparison of live coral cover in Batee Island waters and determine the genus' composition in Batee Island waters. This research was conducted in October-November 2016. Collecting coral reef data using the LIT (Line Intercept Transect) method. The results showed that the live coral cover in Batee Island's waters differed between the East and West Batee Islands. The coral reefs' average condition in Batee Island waters at shallow depths (0-5m) is 41.41%, and deep (6-10m) is 36.52%. Overall, the conditions and live coral cover in the waters of Batee Island are classified as moderate. In the waters of Batee Island, there are 31 coral genera. The highest percentage of corals was the genus Acropora (50.02%).Keywords:Batee IslandConditionCoral reefCoral cover

scholarly journals Associated Of Coral Reef With Reef Fish In Northern And Southern Gili Air Island And Gili Trawangan Island Lombok

2018 ◽  
Vol 47 ◽  
pp. 04003
Author(s):  
Trisna Wahyu A P ◽  
Helmi Mubarak ◽  
Damar Lazuardy Rolian ◽  
Hanson Geraldi Pardede ◽  
Prabowo ◽  
...  
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Cover ◽  
Linear Regression Analysis ◽  
Live Coral ◽  
Simple Linear Regression ◽  
Visual Census ◽  
Underwater Visual Census ◽  
A Value ◽  
Coral Reef Ecosystems

Damage to coral reef ecosystems is a major problem on the islands of Gili Air and Gili Trawangan. This will have an impact on the presence of reef fish in the area. This study aims to look how much relation caused by associated between live coral cover and reef fish in Gili Air and Gili Trawangan island.. This research method using Line Intersept Transect (LIT), Underwater Visual Census and simple linear regression analysis to know the relation. The percentage of coral cover on Gili Air Island and Gili Trawangan Island on reef flats (1-5 m) is 11.75% and 11.67% respectively, on the reef slopes (6-10 m) the percentage is 50.4% and 48.9%. In addition we observed the existence of 11 families reef fish. The abundance of reef fish on Gili Air and Gili Trawangan islands on reefs flat with an average of 0,406 ind / m2 and 0,137 ind / m2, on the reef slope on average - respectively 0,434 ind / m2 and 0,274 ind / m2. The determinant value in Southern part of both island indicates a value close to +1 and in Northern part of both island indicates a value close to -1.

scholarly journals HUBUNGAN PERSENTASE TUTUPAN KARANG DENGAN KELIMPAHAN IKAN KARANG DI PULAU MENJANGAN KECIL, KEPULAUAN KARIMUNJAWA, KABUPATEN JEPARA,JAWA TENGAH (Relationship of Coral Cover Percentage with Reef Fishes Abundance in Menjangan Kecil Island, Karimunjawa Island, Jepara)

2018 ◽  
Vol 6 (4) ◽  
pp. 333-338
Author(s):  
Fahmi Fahmi ◽  
Supriharyono Supriharyono ◽  
Abdul Ghofar
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Reef Fish ◽  
Coral Cover ◽  
Reef Fishes ◽  
Line Transect ◽  
Live Coral ◽  
East Side ◽  
Visual Census ◽  
West Side

Ekosistem terumbu karang merupakan kekayaan sumberdaya laut yang memiliki peranan penting dalam mendukung kehidupan berbagai organisme perairan. Salah satu organisme yang memiliki ketergantungan hidup pada terumbu karang adalah ikan karang. Hal ini dikarenakan ikan karang melalui fase hidup sebagian atau seluruhnya di terumbu karang, sehingga terumbu karang menjadi tempat tinggal, tempat mencari makan, tempat berlindung dan tempat berkembang biak.  Penelitian dilaksanakan pada bulan Mei 2017, dengan tujuan untuk mengetahui persentase tutupan karang hidup dan kelimpahan ikan. Serta hubungan persentase tutupan karang dengan kelimpahan ikan karang pada sisi Barat dan Timur Pulau Menjangan Kecil kedalaman 1 dan 3 meter. Metode yang digunakan adalah metode observasi lapangan, dengan metode sampling menggunakan transek garis (line transect) pada data karang dan visual census untuk data ikan sepanjang 25m. Hasil dari penelitian ini menunjukkan bahwa Persentase rata-rata tutupan karang yang diperoleh pada kedalaman 1 meter sisi Barat adalah 73,39%, sedangkan pada kedalaman 3 meter adalah 85,97%. Persentase tutupan karang pada kedalaman 1 meter sisi Timur adalah 63,73%, sedangkan pada kedalaman 3 meter adalah 77,61%. Secara keseluruhan kondisi terumbu karang masih tergolong baik. Kelimpahan rata-rata ikan pada sisi Barat kedalaman 1 meter adalah 70 individu/125 m2, sedangkan pada kedalaman 3 meter adalah 232 individu/125 m2. Kelimpahan ikan sisi Timur kedalaman 1 dan 3 meter masing-masing adalah 49 dan 138 individu/125 m2. Hasil perhitungan indeks korelasi secara keseluruhan menghasilkan nilai 0,8415 dengan koefesien determinasi sebesar 0,7081. Hal ini menunjukkan bahwa pola hubungan persentase tutupan karang dengan kelimpahan ikan karang kuat (signifikan) dan positif (searah). Coral reef ecosystem is a wealth of marine resources that have an important role in supporting the life of various aquatic organisms. One of the organisms that has a living dependence on coral reefs is reef fish. This is because coral fish through a partial or complete life phase on the coral reef, so that coral reefs become a place to live, a place to find food, shelter and breeding ground. The study was conducted in May 2017, with the objective of knowing the percentage of live coral cover and fish abundance. And the correlation of percentage of coral cover with abundance of reef fish on West and East side of Menjangan Kecil Island depth of 1 and 3 meters. The method used is field observation method, with sampling method using line transect on coral data and visual census for fish data along 25m. The results of this study indicate that the average percentage of coral cover obtained at a depth of 1 meter west side is 73.39%, while at a depth of 3 meters is 85.97%. The percentage of coral cover at depth of 1 meter East side is 63,73%, while at depth 3 meter is 77,61%. Overall the condition of coral reefs is still quite good. The average abundance of fish on the west side of 1 meter depth is 70 individuals / 125 m2, while at 3 meters depth is 232 individuals / 125 m2. The abundance of fish on Eastern side, depth of 1 and 3 meters respectively were 49 and 138 individu / 125 m2. Result of calculation of correlation index as a whole yield value 0,8415 with coefficient of determination equal to 0,7081. This shows that the pattern of correlation of percentage of coral cover with abundance of reef fish is strong (significant) and positive (unidirectional).

scholarly journals Coral reef fish assemblages at Clipperton Atoll (Eastern Tropical Pacific) and their relationship with coral cover

2016 ◽  
Vol 80 (4) ◽  
pp. 479 ◽  
Author(s):  
Aurora M. Ricart ◽  
Fabián A. Rodríguez-Zaragoza ◽  
Carlos González-Salas ◽  
Marco Ortiz ◽  
Amílcar L. Cupul-Magaña ◽  
...  
Keyword(s):  
Species Richness ◽  
Coral Reef ◽  
Reef Fish ◽  
Coral Reef Fish ◽  
Fish Assemblage ◽  
Fish Assemblages ◽  
Coral Cover ◽  
Live Coral ◽  
Assemblage Composition ◽  
Live Coral Cover

Clipperton Atoll, one of the most isolated coral reefs worldwide, is of great scientific interest due to its geomorphology and high levels of endemism. This study explored the reef fish assemblage structure of Clipperton Atoll and its relationship with live coral cover. Nine stations were sampled at three sites and three depths (6, 12 and 20 m) around the reef, measuring fish species richness and biomass and hermatypic coral cover (at genus level). We evaluated variation in species richness, biomass and diversity of fish assemblages among sites and depths, as well as the relationship between the entire fish assemblage composition and live coral cover. The results showed that species richness and biomass were similar among sites, but differed across depths, increasing with depth. In contrast, diversity differed among sites but not among depths. Multivariate analyses indicated that fish assemblage composition differed among sites and depths in relation to changes in cover of coral of the genera Pocillopora, Porites, Pavona and Leptoseris, which dominate at different depths. The results showed that fish species richness and diversity were low at Clipperton Atoll and that, in isolated coral reefs with a low habitat heterogeneity and low human disturbance, live coral cover has a significant influence on the spatial variation of the reef fish assemblages. This study highlights the importance of coral habitat structure in shaping coral reef fish assemblages.

scholarly journals Profil Terumbu Karang Pulau Kangean, Kabupaten Sumenep, Indonesia [Coral Reef Profile of Kangean Island, Sumenep District, Indonesia]

2018 ◽  
Vol 10 (2) ◽  
pp. 76
Author(s):  
Apri Arisandi ◽  
Badrud Tamam ◽  
Achmad Fauzan
Keyword(s):  
Coral Reef ◽  
Reef Fish ◽  
Coral Cover ◽  
Marine Ecosystem ◽  
Marine Biota ◽  
Live Coral ◽  
Visual Census ◽  
Coral Reef Ecosystems ◽  
Marine Ecotourism ◽  
Line Intercept

Abstrak Ekosistem terumbu karang merupakan bagian dari ekosistem laut yang penting, karena menjadi sumber kehidupan bagi biota laut.  Penelitian ini bertujuan untuk mengumpulkan data berupa persentase penutupan karang hidup, lifeform dan jumlah karang.  Kelimpahan ikan karang dan kondisi perairan kepulauan yang terdapat ekosistem terumbu karang bisa menjadi dasar untuk mendukung kesesuaian suatu kawasan menjadi objek ekowisata bahari.  Penelitian dilaksanakan pada bulan juli-Agustus dan dilakukan menggunakan metode Line Intercept Transect (LIT), sepanjang 50 meter sejajar garis pantai pada kedalaman 3 dan 10 meter. Persentase penutupan karang mengacu kepada lifeform dan data ikan karang diambil menggunakan metode pencacahan langsung (visual census).  Hasil penelitian menunjukkan bahwa persentase tutupan karang berada pada kisaran 60-73% yang artinya kondisi ekosistem terumbu karang di Pulau Kangean adalah baik, dan merupakan habitat yang nyaman bagi ikan-ikan karang seperti spesies Apogon sp., Chelmon sp., Chaetodon sp., Lethrinus sp., dan Cheilodipterus sp. AbstractCoral reef ecosystems are part of an important marine ecosystem because they are a source of life for marine biota. This study was aimed to collect data in the form of a percentage of live coral cover, lifeform and number of corals. The abundance of reef fish and the condition of island waters that have coral reef ecosystems can be the basis for supporting the suitability of an area to become an object of marine ecotourism. The study was conducted in July-August and was carried out using the Line Intercept Transect (LIT) method, along 50 meters parallel to the coastline at depths of 3 and 10 meters. The percentage of coral cover refers to the lifeform and data on reef fish are taken using the visual census method. The results showed that the percentage of coral cover was in the range of 60-73%, which means that the condition of the coral reef ecosystem in Kangean Island is good, and is a comfortable habitat for reef fish such as the species Apogon sp., Chelmon sp., Chaetodon sp., Lethrinus sp., and Cheilodipterus sp.

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