POPULATION STRUCTURE OF ACANTHASTER PLANCI ON THE REEF FLAT AT THE SOUTHERN PART OF BUNAKEN ISLAND

The information on population structure of Acanthaster planci in Bunaken National Park (BNP) is urgent to be presented in order to be considered in decision making especially on coral reef management in BNP. The objectives of this study was to examine the population structure of A. planci, represented by the diameter and weight, number of arms, while the density, distribution and types of coral predation by reef animals in the Southern part of Bunaken Island also observed. Data were collected at the three locations namely, front reef flat (FRF), middle reef flat (MRF) and back reef flat (BRF) with total coverage area of 100 x 50 meters. Sixty two individuals (41 at night and 21 at day time) were found with a body diameter ranging between 14 – 28 cm, whereas body weight ranged from 80 – 700 gr, with the number of arms between 9 until 17. The density of A. planci during day time was 0.0042 ind/m2, while the night time was 0.0082 ind/m2, moreover the animal is generally spread aggregated. The results of this study indicated that the population of A. planci in BNP was an adult population with density is still relatively normal, despite an alert sign for the sustainability of coral reef ecosystems in the BNP.

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Bias associated with the detectability of the coral-eating pest crown-of-thorns seastar and implications for reef management

Royal Society Open Science ◽

10.1098/rsos.170396 ◽

2017 ◽

Vol 4 (8) ◽

pp. 170396 ◽

Cited By ~ 6

Author(s):

Mohsen Kayal ◽

Pauline Bosserelle ◽

Mehdi Adjeroud

Keyword(s):

Coral Reef ◽

Marine Invertebrates ◽

Structural Complexity ◽

Density Range ◽

Coral Mortality ◽

Acanthaster Planci ◽

Reef Management ◽

Coral Reef Management ◽

Nocturnal Species ◽

And Control

Outbreaks of the predator crown-of-thorns seastar (COTS) Acanthaster planci cause widespread coral mortality across the Indo-Pacific. Like many marine invertebrates, COTS is a nocturnal species whose cryptic behaviour during the day can affect its detectability, particularly in structurally complex reef habitats that provide many refuges for benthic creatures. We performed extensive day and night surveys of COTS populations in coral reef habitats showing differing levels of structural complexity and COTS abundance. We tested whether estimations of COTS density varied between day and night observations, and if the differences were related to changes in COTS abundance, reef structural complexity and the spatial scale of observation. Estimations of COTS density were on average 27% higher at night than during the day. Differences in COTS detection varied with changing seastar abundance but not reef structural complexity or scale of observation. Underestimation of COTS abundance in daytime was significant for a broad seastar density range, thus potentially affecting most outbreak events. Our study suggests that portions of COTS populations can be undetected during conventional surveys and control campaigns, which are exclusively conducted by day, and significantly affect the trajectory of coral reefs. Accounting for bias in COTS detection can strengthen coral reef management broadly.

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MANAGEMENT ON CORAL REEF ECOSYSTEM IN THE SIANTAN TENGAH DISTRICT, ANAMBAS ISLANDS

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.28930/jitkt.v7i1.9804 ◽

2015 ◽

Vol 7 (1) ◽

Author(s):

Rifki Aldi Ramadhani ◽

Ario Damar ◽

Hawis Madduppa

Keyword(s):

Coral Reef ◽

Ecosystem Management ◽

Multidimensional Index ◽

Coral Reef Ecosystem ◽

Reef Management ◽

Dimensional Scaling ◽

Coral Reef Management ◽

Coral Reef Ecosystems ◽

Reef Ecosystem ◽

Multi Dimensional Scaling

Coral reef ecosystem management in Siantan Tengah District, Anambas Islands need to be improved to obtain the optimal results. Currently, the coral reef ecosystem management is conducted sectorally, therefore, it can cause a damage on coral reef ecosystem. The purposes of this study were to analyze sustainability status of coral reefs managements in the District Central Siantan and to formulate the sustainability of coral reef ecosystem management. Multi Dimensional Scaling (MDS) with Rap-Insus COREMAG approach was used to analyze the sustainability status of coral reef management. The results showed that the sustainability status of coral reef management in Siantan Tengah District was sustainable with multidimensional index of 51.457. Dimensions that need to be improved to achieve the optimal management of coral reef ecosystems in a sustainable manner is social dimension to the value of sustainability by 42.324 and institutional dimensions of 49.85 which is classed as less sustainable. This results of this research are expected to be able to facilitate the stakeholders to arrange the sustainability of coral reef ecosystem management in the Siantan Tengah District. Keywords: coral reef management, sustainability analysis, Siantan Tengah District, Anambas Island, Multi Dimensional Scaling (MDS)

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MANAGEMENT ON CORAL REEF ECOSYSTEM IN THE SIANTAN TENGAH DISTRICT, ANAMBAS ISLANDS

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v7i1.9804 ◽

2015 ◽

Vol 7 (1) ◽

Author(s):

Rifki Aldi Ramadhani ◽

Ario Damar ◽

Hawis Madduppa

Keyword(s):

Coral Reef ◽

Ecosystem Management ◽

Social Dimension ◽

Coral Reef Ecosystem ◽

Reef Management ◽

Dimensional Scaling ◽

Coral Reef Management ◽

Coral Reef Ecosystems ◽

Reef Ecosystem ◽

Multi Dimensional Scaling

Coral reef ecosystem management in Siantan Tengah District, Anambas Islands need to be improved to obtain the optimal results. Currently, the coral reef ecosystem management is conducted sectorally, therefore, it can cause a damage on coral reef ecosystem. The purposes of this study were to analyze sustainability status of coral reefs managements in the District Central Siantan and to formulate the sustainability of coral reef ecosystem management. Multi Dimensional Scaling (MDS) with Rap-Insus COREMAG approach was used to analyze the sustainability status of coral reef management. The results showed that the sustainability status of coral reef management in Siantan Tengah District was sustainable with multidimensional index of 51.457. Dimensions that need to be improved to achieve the optimal management of coral reef ecosystems in a sustainable manner is social dimension to the value of sustainability by 42.324 and institutional dimensions of 49.85 which is classed as less sustainable. This results of this research are expected to be able to facilitate the stakeholders to arrange the sustainability of coral reef ecosystem management in the Siantan Tengah District. Keywords: coral reef management, sustainability analysis, Siantan Tengah District, Anambas Island, Multi Dimensional Scaling (MDS)

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Condition and the state of coral reef management in Lembeh Island waters of Bitung City

JURNAL ILMIAH PLATAX ◽

10.35800/jip.3.2.2015.13223 ◽

2016 ◽

Vol 3 (2) ◽

pp. 79

Author(s):

Steven Ch. Kaunang ◽

Laurentius T. X. Lalamentik ◽

Ari B. Rondonuwu

Keyword(s):

Coral Reef ◽

Coral Cover ◽

Good Condition ◽

The State ◽

Small Island ◽

Community Life ◽

Reef Management ◽

Coral Reef Management ◽

Management And Development ◽

Coral Reef Ecosystems

Lembeh Island is a small island part of the minicipality of Bitung, It is an area that supportincluding the category of small island, but it is an area that support community life in the mainland who mainly living as fishermen. Those fishermen generally made coral reef ecosystems as a location for fishing. This research is aimed to provide information such as ecological conditions and states of coral reef, that can be used appropriately in planning and decision making for the development of Lembeh Island waters, especially in the management of coral reef ecosystems. Intern of coral cover Lembeh island can be categorized in good condition and the state of coral reef management can be seen from the utilization activity that still good but tend to degrade over time. The implication, shows that the management and development of today tend to cause less sustainableto coral ecosystems. Keywords : Lembeh Island, coral reef, manajement, sustainability A B S T R A K Pulau Lembeh merupakan pulau di Kota Bitung, termasuk kategori pulau kecil, tetapi merupakan kawasan yang menunjang kehidupan masyarakat di daratan utama, Masyarakat Pulau Lembeh yang berprofesi sebagai nelayan, umumnya menjadikan ekosistem terumbu karang sebagai lokasi penangkapan ikan karang. Penelitian ini dapat memberikan informasi berupa kondisi ekologi serta status pengelolaan ekosistem terumbu karang, sehingga dapat digunakan secara tepat dalam proses perencanaan dan pengambilan keputusan guna pengembangan perairan Pulau Lembeh, khususnya dalam pengelolaan ekosistem terumbu karang di masa mendatang. Kondisi terumbu karang Pulau Lembeh berdasarkan tutupan karang batu dapat dikategorikan baik, dan status pengelolaan terumbu karang dilihat dari kegiatan pemanfataan saat ini masih baik tapi cenderung menurunkan kualitas kawasan. Implikasinya, memperlihatkan bahwa pengelolaan dan pembangunan saat ini cenderung ditata ke arah kurang berkelanjutan. ________________________________________________________________ Keywords : pulau lembeh, terumbu karang, pengelolaan, keberlanjutan _____________________ 1 Alumni Program Studi Manajemen Sumberdaya Perairan FPIK Unsrat 2Staf Pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi 3;Staf Pengajar Fakultas Perikanan dan Ilmu Kelautan Universitas Sam Ratulangi

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