THE ABUNDANCE OF POTENTIALLY TOXIC EPIPHYTIC DINOFLAGELLATES AND NUTRIENTS FROM  BALI AND GILI TRAWANGAN, INDONESIA

There are strong indicators that the degradation of coral reefs may increase the intensity and frequency of ciguatera fish poisoning (CFP) outbreaks when denuded reef surfaces are colonised by macro algae that are the preferred hosts of toxic dinoflagellates that can cause the disease. Ciguatera field studies have concentrated on the dinoflagellate genus Gambierdiscus, well known to be the producer of ciguatoxin precursors. Moreover the potential of toxins from other dinoflagellate genera such as Prorocentrum and Ostreopsis is less often considered. Whilstit is known that toxic compounds produced by Ostreopsis species include ostreotoxins (OTX) and ostreocins, the potential harmful impacts of Ostreopsis, Prorocentrum and Gambierdiscus species on coral reef organisms (and ecological impacts) are largely unknown. In addition, CFP has historically largely occurred on the oceanic islands of the worldâ€™s tropical seas, but has only recently been reported in the major archipelagoes of Indonesia and thePhilippines. In view of their degraded coral reef ecosystems and the potential link between reef health and CFP, this study examined three sites in Bali and Gili Trawangan over one year, to assess the prevalence and distribution of CFP related dinoflagellate species. Beside finding Gambierdiscus, Ostreopsis and Prorocentrum at most sites, water column nitrogen nutrient levels were also found on the average to be 3âˆ’4 times higher than that recommended for a healthy coral reef (0.013mg/L). However the maximum abundance of Prorocentrum, Ostreopsis and Gambierdiscus found were low (103, 2,860 and 28 cells per gram of wet weight of host macroalgae, respectively). A factor thatmay play a part in the potential for toxicity at these sites is the abundance of sea grass (and associated micro flora and fauna) which are often present within and adjacent to coral reef ecosystems across the Indonesian archipelago.

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KONDISI EKSISTING FAUNA MEGABENTHOS DI PERAIRAN LABUHAN PANDAN LOMBOK TIMUR PASCA GEMPA BUMI LOMBOK 7.0 SKALA RICHTER

JURNAL BIOLOGI TROPIS ◽

10.29303/jbt.v19i2.1303 ◽

2019 ◽

Vol 19 (2) ◽

pp. 172

Author(s):

Noar Muda Satyawan ◽

Novita Tri Atriningrum

Keyword(s):

Coral Reef ◽

External Disturbance ◽

Acanthaster Planci ◽

Coral Reef Ecosystem ◽

Dominance Index ◽

Ecological Changes ◽

Coral Reef Ecosystems ◽

Reef Health ◽

Belt Transect ◽

Reef Ecosystem

Abstrak : Gangguan eksternal pada ekosistem terumbu karang dapat terjadi secara alami ataupun karena aktifitas manusia yang menimbulkan perubahan fisik maupun ekologis. Perubahan ekologis dapat terlihat dari perubahan komposisi biota yang berasosiasi di dalamnya. Salah satu kelompok biota yang berasosiasi dengan terumbu karang adalah megabenthos. Tujuan dari penelitian ini adalah untk mengetahui kondisi eksisting fauna megabenthos pada ekosistem terumbu karang di perairan Labuhan Pandan Lombok Timur. Pengamatan dilakukan pada 5 stasiun yaitu Gili Bidara (BDR_01), Gili Kondo (KND_01), Gili Petagan 1 (PTG_01), Gili Petagan 2 (PTG_02), dan Gili Petagan 3 (PTG_03). Pengambilan data megabenthos dilakukan dengan metode Benthos Belt Transect (BBT). Hasil penelitian menunjukkan bahwa ditemukan 15 jenis megabenthos yang termasuk dalam 5 Phylum (Mollusca, Echinodermata, Chordata, Annelida, dan Platyhelminthes). Jumlah jenis tertinggi ditemukan pada phylum Echinodermata (10 jenis), kemudian diikuti oleh Mollusca (2 jenis), Chordata (1 jenis), Annelida (1 jenis), dan Platyhelminthes (1 jenis). Kepadatan megabenthos tertinggi ditemukan pada stasiun BDR_01 (10.571 ind/Ha), kemudian diikuti oleh stasiun KND_01 (10.214 ind/Ha), PTG_02 (9.857 ind/Ha), PTG_03 (8.429 ind/Ha) dan PTG_01 (1.714 ind/Ha). Keanekaragaman jenis tertingi ditemukan pada stasiun PTG_01 (H’=1,14), kemudian diikuti oleh BDR_01 (H’=0,76), KND_01 (H’=0,69), PTG_03 (H’=0,17) dan PTG_02 (H’=0,09). Hasil perhitungan indeks dominansi menunjukkan bahwa Didemnum molle (phylum Chordata) ditemukan dominan pada seluruh stasiun pengamatan. Ditemukan juga jenis megabenthos pemangsa hewan karang yaitu Acanthaster planci pada stasiun PTG_03 serta Drupella sp. pada stasiun BDR_01, KND_01 dan PTG_02. Beberapa jenis megabenthos yang ditemukan dapat dijadikan bioindikator dalam pemantauan kesehatan ekosistem terumbu karang di Perairan Labuhan Pandan, Lombok Timur.Kata Kunci: Kondisi eksisting, Megabenthos, Gempa Bumi, Labuhan Pandan, Lombok TimurAbstract: External disturbance to the coral reef ecosystem occured by naturally or due to human activities that cause physical and ecological changes. Ecological changes could be seen from changes in the composition of the associated biota. One of the biota groups that associated with coral reefs were megabenthos. The purpose of this study were to determine the condition of the megabenthos fauna on coral reef ecosystems in the Labuhan Pandan waters, Eastern Lombok. Observations were made at 5 stations namely Gili Bidara (BDR_01), Gili Kondo (KND_01), Gili Petagan 1 (PTG_01), Gili Petagan 2 (PTG_02), and Gili Petagan 3 (PTG_03). Data of Megabenthos were collected by Benthos Belt Transect (BBT) method. The results showed that found 15 species of megabenthos included in 5 phylum (Mollusca, Echinoderm, Chordata, Annelida, and Platyhelminthes). The highest number of species were found in Echinoderms phylum (10 species), followed by Mollusca (2 species), Chordata (1 species), Annelida (1 species), and Platyhelminthes (1 species). The highest megabenthos density were found at BDR_01 station (10,571 ind / Ha), then followed by stations KND_01 (10,214 ind / Ha), PTG_02 (9,857 ind / Ha), PTG_03 (8,429 ind / Ha) and PTG_01 (1,714 ind / Ha). The highest species diversity were found at stations PTG_01 (H '= 1.14), then followed by BDR_01 (H' = 0.76), KND_01 (H '= 0.69), PTG_03 (H' = 0.17) and PTG_02 (H '= 0.09). The calculation result of dominance index shows that Didemnum molle (phylum Chordata) were found dominant in all observation stations. Also found species of coral predator Acanthaster planci at PTG_03 station and Drupella sp. at stations BDR_01, KND_01 and PTG_02. Several species of megabenthos can be used as bioindicators to monitoring of coral reef health in Labuhan Pandan Waters, East Lombok.Keywords: Existing conditions, megabenthos, earthquake, Labuhan Pandan, Eastern Lombok

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Review on hard coral recruitment (Cnidaria: Scleractinia) in Colombia

Universitas Scientiarum ◽

10.11144/javeriana.sc16-3.rohc ◽

2011 ◽

Vol 16 (3) ◽

pp. 200 ◽

Cited By ~ 2

Author(s):

Alberto Acosta ◽

Luisa F. Dueñas ◽

Valeria Pizarro

Keyword(s):

Coral Reef ◽

Field Studies ◽

Population Connectivity ◽

Coral Recruitment ◽

Indirect Measure ◽

Juvenile Coral ◽

Management Plans ◽

Coral Communities ◽

Reef Health ◽

And Function

AbstractRecruitment, defined and measured as the incorporation of new individuals (i.e. coral juveniles) into a population, is a fundamental process for ecologists, evolutionists and conservationists due to its direct effect on population structure and function. Because most coral populations are self-feeding, a breakdown in recruitment would lead to local extinction. Recruitment indirectly affects both renewal and maintenance of existing and future coral communities, coral reef biodiversity (bottom-up effect) and therefore coral reef resilience. This process has been used as an indirect measure of individual reproductive success (fitness) and is the final stage of larval dispersal leading to population connectivity. As a result, recruitment has been proposed as an indicator of coral-reef health in marine protected areas, as well as a central aspect of the decision-making process concerning management and conservation. The creation of management plans to promote impact mitigation, rehabilitation and conservation of the Colombian coral reefs is a necessity that requires firstly, a review and integration of existing literature on scleractinian coral recruitment in Colombia and secondly, larger scale field studies. This motivated us to summarize and analyze all existing information on coral recruitment to determine the state of knowledge, isolate patterns, identify gaps, and suggest future lines of research.Key words: Recruitment, juvenile, coral, Scleractinia, structure, reef, Colombia, density, richness, monitoring.

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Utilization of eDNA metabarcoding to assess coral reef health in Okinawa, Japan

10.7287/peerj.preprints.26791 ◽

2018 ◽

Author(s):

James D Reimer ◽

Joseph DiBattista ◽

Piera Biondi ◽

Giovanni D Masucci ◽

Michael Stat ◽

...

Keyword(s):

Coral Reef ◽

Environmental Dna ◽

Global Scale ◽

Coastal Development ◽

Marine Biodiversity ◽

Critical Data ◽

Coral Reef Ecosystems ◽

Reef Health ◽

Seawater Samples ◽

Over Exploitation

Environmental DNA (eDNA) metabarcoding has great potential in assessing comparative total biodiversity, and facilitating robust comparisons across a wide variety of sites and taxa. In particular, eDNA combined with next-generation sequencing can help address the huge critical data gaps in our understanding of marine biodiversity, especially in regions with high levels of understudied diversity such as the coral reefs of the Indo-Pacific region. Within this region, Okinawa is known for its high levels of marine biodiversity and endemicity, and also for the threats shallow coral reef ecosystems face from a variety of stressors including local-scale coastal development and over-exploitation to global scale threats such as climate change. In this study, we generated eDNA metabarcoding sequences from sediment and seawater samples from various reefs in Okinawa, Japan. At the same time, we developed a simple methodology to assess the relative health of these reefs based on anthropogenic and natural stressors. We discuss our eDNA results in comparison to coral reef health, identify potential bioindicator taxa, and explore the relative biodiversity of coral reef communities across sites. Our results indicate that taxa asides from the corals (Scleractinia) can provide robust information on coral reef health.

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Utilization of eDNA metabarcoding to assess coral reef health in Okinawa, Japan

10.7287/peerj.preprints.26791v1 ◽

2018 ◽

Author(s):

James D Reimer ◽

Joseph DiBattista ◽

Piera Biondi ◽

Giovanni D Masucci ◽

Michael Stat ◽

...

Keyword(s):

Coral Reef ◽

Environmental Dna ◽

Global Scale ◽

Coastal Development ◽

Marine Biodiversity ◽

Critical Data ◽

Coral Reef Ecosystems ◽

Reef Health ◽

Seawater Samples ◽

Over Exploitation

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Restaurant decision-maker perceptions of barriers and opportunities for invasive lionfish consumption

10.31235/osf.io/p9wrq ◽

2021 ◽

Author(s):

Kate Burgess ◽

Nathan Smith ◽

Jennifer N. Solomon ◽

Kaylin Clements ◽

Joanne Burgess ◽

...

Keyword(s):

Coral Reef ◽

Reef Fishes ◽

Marine Ecosystems ◽

Ecological Impacts ◽

Economic Damage ◽

Western Atlantic ◽

Pterois Miles ◽

Coral Reef Ecosystems ◽

Invasive Lionfish ◽

Barriers And Opportunities

Lionfish (Pterois volitans, Pterois miles), invasive coral reef fishes in the western Atlantic, cause extensive negative impacts to marine ecosystems. Following their introduction in Florida in the 1980’s, lionfish colonized numerous coral reef ecosystems and have been documented at depths ranging from 1-300m. In addition to depleting native reef fish biomass and threatening macroalgae induced phase shifts on shallow reefs, the invasion of lionfish has caused severe economic damage in the form of reduced native fish yields for local fisher people and high costs of management. While few examples exist of successful management of marine invasive species, studies have shown that lionfish removal can decrease their density and increase prey species biomass. A critical component and challenge for any effective lionfish removal effort is to maintain consistently high levels of lionfish harvesting so as to reduce lionfish abundance to levels that mitigate their negative ecological impacts. One popular market-based option that may achieve this is increasing the demand for the consumption of lionfish. This management solution offers potential benefits to both human livelihoods and marine ecosystems. Our study focuses on Florida’s consumptive lionfish market and fills a gap in understanding the lionfish supply chain for Florida’s restaurant industry. Although lionfish are commercially available in Florida, they are not currently widely consumed with consistency. We conducted interviews with twenty restaurant decision-makers in FL to understand their perceptions of barriers and opportunities for increasing their use of invasive lionfish. The most commonly identified barriers were: price and consistency of supply, while the most prominent opportunities were: improved awareness and culinary potential to increase the demand for lionfish. Conservation managers and policymakers should leverage these findings to facilitate opportunities, address barriers, and promote public education about invasive lionfish and their impacts.

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Identifikasi Kondisi Kesehatan Ekosistem Terumbu Karang di Pulau Sepa, Kepulauan Seribu

BULETIN OSEANOGRAFI MARINA ◽

10.14710/buloma.v10i1.32169 ◽

2021 ◽

Vol 10 (1) ◽

pp. 23-32

Author(s):

Ankiq Taofiqurohman ◽

Ibnu Faizal ◽

Kholid Agil Rizkia

Keyword(s):

Coral Reef ◽

Coral Reefs ◽

Coral Cover ◽

Health Condition ◽

Anthropogenic Factors ◽

Tourist Attractions ◽

Coral Reef Ecosystems ◽

Thousand Islands ◽

Reef Health ◽

Color Score

Kepulauan Seribu merupakan gugusan pulau di perairan utara Jakarta yang memiliki daya tarik wisata terutama untuk snorkeling dan diving dengan adanya terumbu karang, salah satunya adalah Pulau Sepa. Ekosistem terumbu karang merupakan ekosistem yang rentan mengalami degradasi oleh berbagai faktor. Kegiatan snorkeling menjadi salah satu ancaman yang terjadi pada terumbu karang, oleh karena itu diperlukan pengukuran mengenai kondisi kesehatan ekosistem terumbu karang, khususnya Pulau Sepa kepulauan Seribu, sebagai bentuk integrasi konservasi ekosistem dan pengelolaan wisata. Riset ini dilakukan di Pulau Sepa, Taman Nasional Kepulauan Seribu pada Bulan Maret-Agustus 2020. Wilayah yang diamati merupakan spot snorkeling pada kedalaman 1-5 m pada 10 stasiun penelitian , dengan mengklasifikasikan warna kesehatan dan juga tipe karang menggunakan klasifikasi dari Coral Watch. Skor warna kesehatan terumbu karang pada zona snorkeling Pulau Sepa, didominasi dengan kondisi kurang sehat pada skor warna 4, dengan dominasi tipe karang branching dan boulder dan sedikit tipe pertumbuhan plate dan soft. Kriteria kesehatan terumbu karang mayoritas berada pada kurang sehat, sedikit sehat dan tidak ditemukan yang tidak sehat. Rincian kriteria kesehatan terumbu karang kurang sehat di temui pada stasiun 1-10 dengan masing masing persentase 92%, 72%, 100%, 94%, 78%, 94%, 100%, 100%, 67%, dan 89%, untuk rincian kriteria kesehatan terumbu karang sehat pada stasiun 1-10 dengan masing-masing persentase 8%, 28%, 0%, 6%, 22%, 6%, 0%, 0%, 33%, 11%. Faktor lingkungan seperti kecerahan yang dipengaruhi oleh sedimentasi serta tekanan antropogenik dari aktivitas manusia mempengaruhi kondisi tutupan karang di pulau ini. The Thousand Islands are a group of islands in the northern waters of Jakarta which have tourist attractions, especially for snorkeling and diving with the presence of coral reefs, one of which is Sepa Island. Coral reef ecosystem is an ecosystem that is prone to degradation by various factors. Snorkeling activities are one of the threats that occur on coral reefs, therefore it is necessary to measure the health condition of coral reef ecosystems, especially Sepa Island, the Thousand Islands, as a form of integration of ecosystem conservation and tourism management. This research was conducted on Sepa Island, Thousand Islands National Park on March - August 2020. The area observed is a snorkeling spot at a depth of 1-5 m at 10 research stations, by classifying the color of health and also the type of coral using the classification from Coral Watch. The coral reef health color score in the Sepa Island snorkeling zone, was dominated by unhealthy conditions at a color score of 4, with a dominance of branching and boulder coral types and few plate and soft growth types. The majority of coral reef health criteria are unhealthy, slightly healthy and not found unhealthy. Details of the health criteria for unhealthy coral reefs were found at stations 1-10 with each percentage of 92%, 72%, 100%, 94%, 78%, 94%, 100%, 100%, 67%, and 89%, respectively. details of health criteria for healthy coral reefs at stations 1-10 with each percentage of 8%, 28%, 0%, 6%, 22%, 6%, 0%, 0%, 33%, 11%. Environmental factors such as clarity which influenced by sedimentation and anthropogenic factors from human activities affect the condition of coral cover on this island.

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General practitioners and clinical pharmacology

Psychiatry and Psychobiology ◽

10.1017/s0767399x00002820 ◽

1989 ◽

Vol 4 (4) ◽

pp. 241-244

Author(s):

P. Lemoine

Keyword(s):

Clinical Pharmacology ◽

General Practitioners ◽

Field Studies ◽

Discussion Group ◽

Group Method ◽

Study Group ◽

Test Drug ◽

Monthly Basis ◽

One Year ◽

The One

SummaryIt is difficult to undertake field studies with non marketed psychotropic drugs because of two apparently contradictory conditions : on the one hand, the methodology has to be rigorously controlled, and on the other hand, such studies have to be carried out in their future environment by general practitioners (GPs). Bearing in mind the lack of training and experience regarding this kind of approach, the author adopted a discussion group method according to the techniques developed by M. Balint. The study group comprised five GPs, a clinical pharmacology expert and a doctor from the pharmaceutical laboratory which had developed the test drug. These persons met on a monthly basis over a one year period. In the present paper, the author indicates the benefits of such a methodology, based on six years’ experience and several trials, with special emphasis placed on the pedagogical aspects.

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