Which Method for Which Purpose? A Comparison of Line Intercept Transect and Underwater Photogrammetry Methods for Coral Reef Surveys

The choice of ecological monitoring methods and descriptors determines the effectiveness of a program designed to assess the state of coral reef ecosystems. Here, we comparer the relative performance of the traditional Line Intercept Transect (LIT) method with three methods derived from underwater photogrammetry: LIT on orthomosaics, photoquadrats from orthomosaics, and surface analyses on orthomosaics. The data were acquired at Reunion Island on five outer reef slopes and two coral communities on underwater lava-flows. Coral cover was estimated in situ using the LIT method and with LITs and photoquadrats digitized on orthomosaic. Surface analyses were done on the same orthomosaics. Structural complexity of the surveyed sites was calculated from digital elevation models using three physical descriptors (fractal dimension, slope, surface complexity), and used to explore their possible influence in coral cover estimates. We also compared the methods in terms of scientific outputs, the human expertise and time required. Coral cover estimates obtained with in situ LITs were higher than those obtained with digitized LITs and photoquadrats. Surfaces analyses on orthomosaics yielded the lowest but most the precise cover estimates (i.e., lowest sample dispersion). Sites with the highest coral cover also had the highest structural complexity. Finally, when we added scientific outputs, and requirements for human expertise and time to our comparisons between methods, we found that surface analysis on the orthomosaics was the most efficient method. Photoquadrats were more time-consuming than both in situ and digitized LITs, even though they provided coral cover estimates similar to those of digitized LITs and yielded more than one descriptor. The LIT in situ method remains the least time-consuming and most effective for species-level taxonomic identifications but is the most limited method in terms of data outputs and representativeness of the ecosystem.

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Analysis Condition of Coral Reef Covering in Pramuka Island Waters, Seribu Islands using Line Intercept Transect (LIT) Method

Jurnal Riset Biologi dan Aplikasinya ◽

10.26740/jrba.v2n2.p77-81 ◽

2020 ◽

Vol 2 (2) ◽

pp. 77

Author(s):

Rega Permana ◽

Nora Akbarsyah ◽

Pringgo KDNY Putra ◽

Aulia Andhikawati

Keyword(s):

Coral Reef ◽

Coral Reefs ◽

Coral Cover ◽

Life Forms ◽

Anthropogenic Factors ◽

Coral Reef Ecosystem ◽

Marine Tourism ◽

Tourist Destinations ◽

Line Intercept ◽

Reef Ecosystem

The coral reef ecosystem is one of the typical tropical ecosystems with high biodiversity which has an important role both biologically, ecologically, physically as well as socially and economically. Several coral reef areas in Indonesia were reported to have suffered damage, not only due to climate change which has an impact on rising sea surface temperatures and ocean acidification but also due to anthropogenic factors and irresponsible management of marine tourism. This study aimed to analyze the condition of coral reefs based on covering in Pramuka Island, which is one of the famous tourist destinations in the Seribu Islands. The study was conducted using Line Intercept Transect (LIT) method at predetermined coordinate points. The results showed that the dominant coral reef life form was Acropora Submassive (ACS), namely 18.9%, and Acropora Branching (ACB) as much as 12.48%. Besides, the types of life forms found were coral foliase (9.42%), Miliepora Coral (9.2%), Coral Massive (4.8%), Acropora Encrustring (4.24%), and so on. Based on the results of this study, it can be concluded that the condition of coral reefs in Pramuka Island is still relatively good with a total coral cover percentage of 72.38%. Efforts to protect the coral reef ecosystem in this area need to be considered so that its condition can be maintained.

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Urgent need for coral demography in a world where corals are disappearing

Marine Ecology Progress Series ◽

10.3354/meps13205 ◽

2020 ◽

Vol 635 ◽

pp. 233-242 ◽

Cited By ~ 11

Author(s):

PJ Edmunds ◽

B Riegl

Keyword(s):

Coral Reef ◽

Coral Reefs ◽

Coral Cover ◽

Ecological Monitoring ◽

Economic Importance ◽

Coral Abundance ◽

Scientific Endeavor ◽

Reef Monitoring

Coral reefs have long attracted attention because of their biological and economic importance, but this interest now has turned to examining the possibility of functional extirpation. Widespread declines in coral abundances have fueled the shift in motivation for studying reefs and catalyzed the proliferation of monitoring to record the changes underway. Despite appreciation of monitoring as a scientific endeavor, its primary use has continued to be the quantification of cover of coral, macroalgae, and a few other space holders. The limitations of coral cover in evaluating the consequences of changing coral abundance were highlighted decades ago. Yet neglect of the tools most appropriate for this task (demographic approaches) and continuing emphasis on a tool (coral cover) that is not ideal, indicates that these limitations are not widely appreciated. Reef monitoring therefore continues to underperform with respect to its potential, thus depriving scientists of the approaches necessary to project the fate of coral reefs and test hypotheses focused on the proximal causes of declining coral cover. We make the case that the coral reef crisis creates a need for coral demography that is more acute now than 4 decades ago. Modern demographic approaches are well suited to meet this need, but to realize their potential, consideration will need to be given to the possibility of expanding ecological monitoring of coral reefs to provide the data necessary for demographic analyses of their foundation taxon, the Scleractinia.

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Dampak Kegiatan Pariwisata terhadap Status Tutupan Terumbu Karang dan Valuasi Ekonomi di Kepulauan Karimunjawa The Impact of Tourism Activities on The Status of Coral Reef Cover and Economic Valuation in Karimunjawa Island

Management of Aquatic Resources Journal (MAQUARES) ◽

10.14710/marj.v9i1.27762 ◽

2020 ◽

Vol 9 (1) ◽

pp. 72-80

Author(s):

Ary Hendri Pribadi ◽

Suryanti Suryanti ◽

Churun Ain

Keyword(s):

Coral Reef ◽

Coral Reefs ◽

Coral Cover ◽

Economic Valuation ◽

Economic Value ◽

Travel Cost ◽

Travel Cost Method ◽

The Status ◽

The Impact ◽

Line Intercept

ABSTRAK Pulau Karimunjawa adalah salah satu objek destinasi wisata keindahan ekosistem terumbu karang. Kunjungan wisatawan di Karimunjawa dapat berdampak pada terumbu karang dan nilai ekonomi pariwisata. Penelitian ini dilaksanakan pada April-Mei 2019 di Kepulauan Karimunjawa, Kabupaten Jepara. Tujuan dari penelitian ini untuk mengetahui dampak pariwisata terhadap nilai status tutupan terumbu karang dengan menggunakan metode Line Intercept Transect (LIT) di Pulau Tanjung Gelam, Pulau Menjangan Besar dan Pulau Cemara Kecil serta nilai valuasi ekonomi pariwisata dengan menggunakan metode biaya perjalanan atau Travel Cost Method (TCM). Hasil yang didapatkan dari penelitian ini yaitu jumlah kunjungan wisatawan yang datang ke Pulau Karimunjawa meningkat sejak tahun 2016 hingga tahun 2018. Kondisi status tutupan terumbu karang yang diperoleh dalam kondisi baik dengan nilai karang hidup yang didapatkan pada Pulau Tanjung Gelam 61,6%, Pulau Menjangan Besar 70,8% dan Pulau Cemara Kecil 57,3%. Luasan terumbu karang pada tahun 2016 hingga tahun 2018 di Pulau Mejangan Besar dan Cemara Kecil mengalami penurunan. Sedangkan nilai valuasi ekonomi tahun 2016 sejumlah Rp.125.426.860,- 2017 dan 2018 sejumlah Rp.135.437.480,- dan Rp.156.932.039,-. Dampak wisatawan yang berkunjung tahun 2016-2018 pada valuasi ekonominya tiap tahunnya mengalami peningkatan. Hasil nilai valuasi ekonomi yang didapatkan pada penelitian ini,nilai rata-rata TCM pada wilayah Kabupaten Jepara Rp.1.111.023,- dan nilai ekonomi pertahunnya Rp.3.369.031.988,-. Rata-rata biaya perjalanan luar wilayah Kabupaten Jepara Rp.1.146.314,- dan nilai biaya pertahunnya Rp.12.324.171.938,-. Nilai total valuasi ekonomi dari dalam wilayah Kabupaten Jepara dan luar wilayah Kabupaten Jepara yaitu Rp.156.693.203.925,-. ABSTRACT Karimunjawa Island is one of the tourist destinations of the beauty of the coral reef ecosystem. Tourist visits in Karimunjawa can have an impact on coral reefs and the economic value of tourism. This research was conducted in April-May 2019 in the Karimunjawa Islands, Jepara Regency. The purpose of this study was to determine the impact of tourism on the status of coral cover status using the Line Intercept Transect (LIT) method on Tanjung Gelam Island, Menjangan Besar Island and Cemara Kecil Island and the economic valuation value of tourism using the travel cost method or the Travel Cost Method ( TCM). The results obtained from this study are the number of tourist arrivals to Karimunjawa Island increased from 2016 to 2018. The status of coral cover status obtained in good condition with the value of live coral obtained on Pulau Tanjung Gelam 61.6%; Pulau Menjangan Besar 70.8% and Pulau Cemara Kecil 57.3%. The extent of coral reefs in 2016 to 2018 on Pulau Mejangan Besar and Pulau Cemara Kecil declined. While the value of economic valuations in 2016 amounted to Idr.125,426,860,- 2017 and 2018 amounted to Idr.135,437,480,- and Idr.156,932,039,-. The impact of tourists visiting 2016-2018 on their economic valuations has increased each year. The results of the economic valuation obtained in this study, the average value of TCM in the Jepara Regency region is Idr.1,111,023, and the annual economic value is Idr.3,369,031,988. The average cost of trips outside the area of Jepara Regency is Idr.1,146,314, and the annual cost is Idr.12,321,171,938. The total value of economic valuations from within the Jepara Regency and outside the Jepara Regency is Idr.156,693,203,925.

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

DEPIK ◽

10.13170/depik.10.2.19995 ◽

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

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Coral Reef Zone Analysis in Development of Segmentation Ecotourism in Karimunjawa National Park

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2019/v4i430062 ◽

2019 ◽

pp. 1-15

Author(s):

Aramita Livia Ardis ◽

Mega Laksmini Syamsudin ◽

Herman Hamdani ◽

Lantun Paradhita Dewanti

Keyword(s):

Remote Sensing ◽

Coral Reef ◽

Carrying Capacity ◽

National Park ◽

Coral Cover ◽

Sea Surface ◽

Remote Sensing Technology ◽

Sensing Technology ◽

Coral Reef Ecosystems

Karimunjawa is one of the main destinations that present underwater beauty that is quite popular. But due to increased tourism activities provide economic benefits but also have a negative impact on coral reef ecosystems so that prudent and sustainable management is needed, these characteristics are felt capable of being helped by remote sensing technology. The purpose of this research is to analyze the coral reef zoning for the development of ecotourism segmentation and the carrying capacity of coral reef ecosystems and to map the condition of coral reef ecosystems in the Karimunjawa National Park area through remote sensing technology. The method used in data collection uses a survey method which is divided into 2 types in-situ conducted on 19th April 2019 to 2nd May 2019 and ex-situ taken for 4 years for coral cover and 1 year for sea surface temperature. By using quantitative descriptive analysis, land suitability results are obtained based on the land suitability index approach and the percentage of coral cover in determining the mapping of ecotourism segmentation areas. The results of this research show that through in-situ approach, data collection in three stations on Sintok and Menjangan Kecil Islands has good coral cover while Cemara Besar is damaged. The appropriate Tourism Conformity Index value is on Menjangan Kecil Island while the other two stations are not so that the carrying capacity calculation is only done on the appropriate and very appropriate island. Inversely proportional through the analysis of the Scenic Beauty Estimation value, Cemara Besar Island which shows a high value while on the Menjangan Kecil Island the lowest. Spatial analysis shows that the fluctuation in sea surface temperature during one year is not too significant and is still limited to the optimum temperature range for coral growth so that it does not affect the conditions causing damage to coral reefs, called bleaching. Looking at the distribution of coral reefs via satellite, over the past 4 years shows an increase in dead coral cover leaving 6,752,802 m2 in 2019.

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Kondisi Terumbu Karang Di Pantai Empu Rancak Kabupaten Jepara

Jurnal Kelautan Tropis ◽

10.14710/jkt.v21i1.2301 ◽

2018 ◽

Vol 21 (1) ◽

pp. 49 ◽

Cited By ~ 1

Author(s):

Suryono Suryono ◽

Edi Wibowo ◽

Raden Ario ◽

Nur Taufiq SPJ ◽

Ria Azizah

Keyword(s):

Coral Reef ◽

Coral Reefs ◽

Coastal Waters ◽

Coral Cover ◽

Good Condition ◽

Ecological Impacts ◽

Marine Tourism ◽

Run Off ◽

Index Value ◽

Line Intercept

Abstract Coral Reef Condition In Coastal Waters of Empu Rancak, Mlonggo, Regency of Jepara Empu Rancak coastal waters in Karanggondang village, Mlonggo District is one of the coral reef ecosystem location in coastal area of Jepara Regency. Following the growth of culinary and Marine tourism bring the need for monitoring the condition of coral reefs so that such activity does not provide ecological impacts against the condition of coral reefs. The method used to assess the condition of coral reefs is Line Intercept Transect which done by percentage calculation of living coral coverage. The research results shows that the condition of the coral reefs in a depth of 3 metres found coral cover percentage of 4.5%, while at a depth of 6 meters found coral cover percentage of 9.7%. From this result indicates the coral reefs in critical condition，however the high biodiversity and dominance index value is presumed that these coral reefs was in good condition. It`s showed by the high percentage of coral die either at a depth of 3 metres (95.54%) or at a depth of 6 meters(90.30%). The diversity of species of coral were found at a depth of 3 meters consist of 6 genus, they are: Goniastrea sp., Favia sp., Galaxea sp., Porites, Acropora sp. and Montipora sp., whereas at a depth of 6 meters were found more species of coral diversity for at least 11 genus, they are: Acropora sp., Favites sp., Echinopora sp., Goniastrea sp. Symphyllia agaricia sp, Favia sp., Goniopora sp., Porites sp., Montipora sp., Platygyra sp., and Montastrea sp. The condition of coral reefs cover which relatively critical are caused by decreasing the quality of waters ecology that caused by sedimentation rate and runoff processes of land activity, high waves in northwest monsoon and the growth of culinary tourism as well as marine tourism in Empu Rancak coastal waters gradually worsen the condition of coral reefs. Keywords : Coral reef, tourism, Line Intercept Transect, AbstrakPerairan pantai Empu Rancak desa Karanggondang, Kecamatan Mlonggo merupakan salah satu lokasi ekosistem terumbu karang yang berada pesisir di kabupaten Jepara. Dengan berkembangnya aktivitas wisata kuliner serta wisata bahari, maka perlu dilakukan pemantauan kondisi terumbu karang agar kegiatan tersebut tidak tidak memberikan dampak ekologi terhadap kondisi terumbu karang. Metode yang dipergunakan untuk menilai kondisi terumbu karang adalah dengan metode perhitungan persentase penutupan karang hidup menggunakan Line Intercept Transect. Hasil penelitian menunjukan bahwa Kondisi terumbu karang di kedalaman 3 meter ditemukan prosentasi tutupan karang sebesar 4,5 %, sedangkan pada kedalaman 6 meter ditemukan prosentase tutupan karang sebesar 9,7 %, maka kondisi terumbu karang di perairan pantai empu rancak Mlonggo, dalam kondisi buruk sekali, namun tingginya keanekaragaman dan nilai indeks dominasi, maka diduga bahwa terumbu karang dilokasi penelitian pernah dalam kondisi baik sebelumnya. Hal ini ditunjukan dengan tingginya prosentase karang mati baik pada kedalaman 3 meter (95,54 %) maupun pada kedalaman 6 meter (90,30 %). Keanekaragaman jenis karang yang ditemukan pada kedalaman 3 meter terdiri atas 6 genus yaitu : GoniastreaSp., Favia Sp., Galaxea Sp., Porites Sp., Acropora Sp.,dan Montipora Sp.,sedangkan pada kedalaman 6 meter ditemukan keanekaraamanan jenis karang yang lebih banyak (11 genus), yaitu : Acropora sp., Favites sp., Echinopora sp., Goniastrea sp., Symphyllia agaricia, Favia sp., Goniopora sp., Porites sp., Montipora sp., Platygyra sp. ,dan Montastrea sp. Kondisi tutupan terumbu karang yang relatif buruk sekali diduga diakibatkan oleh menurunnya kualitas ekologi perairan yang diakibatkan oleh oleh tekanan laju sedimentasi serta proses run off dari aktivitas didaratan, tingginya paparan gelombang pada saat musim barat serta berkembangnya wisata kuliner serta wisata bahari di perairan Pantai Empu rancak yang memperburuk kondisi terumbu karang. Kata Kunci : Terumbu Karang, pariwisata, Line Intercept Transect

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Ecological Conditions And Economic Values Of Coral Reef Flats In Mattiro Deceng Village, Badi Island, Pangkajenne Kepulauan Regency, South Sulawesi

JURNAL ILMIAH PLATAX ◽

10.35800/jip.7.1.2019.22596 ◽

2019 ◽

Vol 7 (1) ◽

pp. 142

Author(s):

Ella Maria Tudang ◽

Unstain N. W. J. Rembet ◽

Adnan S Wantasen

Keyword(s):

Coral Reef ◽

Economic Value ◽

Coral Reef Ecosystem ◽

Outer Reef ◽

Reef Area ◽

Ecological Conditions ◽

South Sulawesi ◽

Total Economic Value ◽

Line Intercept ◽

Reef Ecosystem

This research was carried out in Badi Island waters on Mattiro Deceng Village, Pangkajenne Kepulauan Regency, South Sulawesi. The aims of this study are to know the ecological conditions of the coral reef ecosystem at; and to calculate the economic value of coral reef ecosystems at the research area. To determine the ecological conditions of coral reefs, data were obtained by using the Transect Line Intercept (LIT) method which were used in 3 different locations including: inner reef, middle reef, and outer reef. All benthic biota passed through the transect were recorded based on their growth form. On the other hand, to obtain the total economic value, interviews were conducted within the community who were active in utilizing the coral reef ecosystem by using the purposive sampling method. The condition of the coral reef of Badi Island on inner reef area (48.62%) was considered in the medium category and for the middle reef area is 64.10% and the outer reef area is 50.01% were both considered in the good category. The total economic value of Badi Island's coral reef ecosystem in Mattiro Deceng Village is Rp. 10,567,286,000 / year, whereas for the direct benefit calculated value is Rp. 9,213,714,286 / year and for the value of indirect benefits is totaling Rp. 1,353,572,000/year.Keywords: Ecological Conditions, Economic Value, Coral ReefsABSTRAKPenelitian ini dilakukan di Perairan Pulau Badi Desa Mattiro Deceng Kabupaten Pangkajenne Kepulauan, Sulawesi Selatan dengan tujuan untuk: 1. Mengetahui kondisi ekologi ekosistem terumbu karang pada lokasi penelitian. 2. Mengetahui nilai ekonomi ekosistem terumbu karang pada lokasi penelitian. Untuk menentukan kondisi ekologi terumbu karang akan di peroleh dengan menggunakan metode Line Intercept Transek (LIT) pada 3 lokasi berbeda yaitu inner reef, middle reef, dan outer reef, dimana setiap biota bentik yang dilewati transek akan dicatat menurut bentuk pertumbuhannya. Sedangkan untuk memperoleh nilai ekonomi total dilakukan wawancara kepada masyarakat yang beraktivitas di ekosistem terumbu karang dengan menggunakan metode Purposive Sampling. Kondisi terumbu karang Pulau Badi pada inner reef (48,62%) termasuk dalam kategori sedang dan pada middle reef ( 64,10%) dan outer reef (50,01%) termasuk dalam kategori baik. Nilai total ekonomi ekosistem terumbu karang Pulau Badi Desa Mattiro Deceng sebesar Rp. 10.567.286.000/tahun, dimana untuk nilai manfaat langsung sebesar Rp. 9.213.714.286/tahun untuk nilai manfaat tidak langsung sebesar Rp. 1.353.572.000/tahun.Kata Kunci : Kondisi Ekologi, Nilai Ekonomi, Terumbu Karang

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

Jurnal Ilmiah Perikanan dan Kelautan ◽

10.20473/jipk.v10i2.10516 ◽

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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The Correlation of Coral Reef Cover and Rugosity with Coral Reef Fish Density in East Java Waters

Jurnal Ilmiah Perikanan dan Kelautan ◽

10.20473/jipk.v12i1.14356 ◽

2020 ◽

Vol 12 (1) ◽

pp. 131

Author(s):

Wahyu Andy Nugraha ◽

Faizun Mubarak ◽

Eko Husaini ◽

Hasyim Evendi

Keyword(s):

Coral Reef ◽

Reef Fish ◽

Coral Reef Fish ◽

Coral Cover ◽

Fish Abundance ◽

Fish Density ◽

High Productivity ◽

Tropical Area ◽

Belt Transect ◽

Line Intercept

HighlightsCoral cover, rugosity, and reef fish abundance was determinedThe relationship between coral cover and rugosity and fish abundance was analyzed.Coral cover in East Java were categorized as medium – good.The rugosity index and the fish abundance were highest in Bangsring Waters.There are no relationships between coral cover and fish abundance, but there is relationship between rugosity and fish abundance.AbstractA coral reef is one of the most complex and specific ecosystems in a tropical area. It is identified by its high productivity and biodiversity. This research aims to discover the percentage of coral reef cover and rugosity, as well as the fish abundance in several locations in East Java, Indonesia. In addition, this research aims to investigate the correlation of coral reef cover and rugosity with the density of coral reef fish. This research was conducted in three locations, i.e., Bangsring Waters of Wongsorejo District, Banyuwangi Regency; Gili Noko Bawean Island, Gresik Regency; and Kramat Island, Gili Genting District, Sumenep Regency. This research employed the Line Intercept Transect (LIT) method to calculate the percentage of coral reef cover, the Chain Intercept Transect (CIT) method to determine the coral reef rugosity, and the Belt Transect method to estimate the fish abundance. From this research, it was revealed that the highest coral reef cover was in Bawean waters, while the highest rugosity was in Bangring waters. In addition, the highest coral reef fish density was in Bangsring waters. Meanwhile, the coral reef fish density did not correlate with the percentage of coral reef cover. In contrast, it correlated with the coral reef rugosity.

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3D HABITAT COMPLEXITY OF CORAL REEFS IN THE NORTHWESTERN HAWAIIAN ISLANDS IS DRIVEN BY CORAL ASSEMBLAGE STRUCTURE

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-2-w10-61-2019 ◽

2019 ◽

Vol XLII-2/W10 ◽

pp. 61-67 ◽

Cited By ~ 3

Author(s):

J. H. R. Burns ◽

A. Fukunaga ◽

K. H. Pascoe ◽

A. Runyan ◽

B. K. Craig ◽

...

Keyword(s):

Coral Reef ◽

Habitat Complexity ◽

Coral Cover ◽

Light Availability ◽

Structural Complexity ◽

Assemblage Structure ◽

Natural Environments ◽

Live Coral ◽

Ecological Processes ◽

Coral Assemblage

<p><strong>Abstract.</strong> Corals act as ecosystem engineers by secreting structurally complex calcium carbonate skeletons on the benthic substrate that provide habitat for a diverse array of associated reef organisms. Communities of living corals create large and dynamic benthic structures that directly affect ecological parameters such as habitat provisioning and light availability, thus influencing overall ecosystem function. Despite the important role 3D structural complexity plays in ecosystem biodiversity and productivity, the field of coral ecology has lacked accessibility to practical technology capable of quantifying 3D characteristics of underwater habitats. Advancements in the field of computer vision has led to Structure-from-Motion (SfM) photogrammetry, which provides a simple and cost-effective method for creating high-resolution and spatially accurate 3D reconstructions of natural environments. Integrating SfM approaches into coral reef research and monitoring has provided useful insight into the relationship between 3D habitat complexity and ecological processes. In this study, we examined the relationships among 2D estimates of live coral cover and several metrics of 3D habitat structural complexity among eleven long-term monitoring sites at French Frigate Shoals. Our findings show that coral assemblage structure acts as a significant driver of 3D structural complexity of coral reef habitats at this atoll. This study highlights the importance of diverse and abundant coral assemblages in supporting structurally complex coral reef habitats and provides a framework for future investigations into the ecological role of various coral morphotypes.</p>

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