scholarly journals Dissolved Nitrogen Acquisition in the Symbioses of Soft and Hard Corals With Symbiodiniaceae: A Key to Understanding Their Different Nutritional Strategies?

2021 ◽  
Vol 12 ◽  
Author(s):  
Chloé A. Pupier ◽  
Renaud Grover ◽  
Maoz Fine ◽  
Cécile Rottier ◽  
Jeroen A. J. M. van de Water ◽  
...  
Keyword(s):  
Nitrogen Assimilation ◽  
Soft Coral ◽  
C:N Ratio ◽  
Gulf Of Aqaba ◽  
Coral Host ◽  
Soft Corals ◽  
Hard Coral ◽  
Dissolved Nitrogen ◽  
Algal Symbionts ◽  
Nutritional Strategies

Nitrogen is one of the limiting nutrients for coral growth and primary productivity. Therefore, the capacity of different associations between corals and their algal symbionts (Symbiodiniaceae) to efficiently exploit the available nitrogen sources will influence their distribution and abundance. Recent studies have advanced our understanding of nitrogen assimilation in reef-building scleractinian (hard) coral-Symbiodiniaceae symbioses. However, the nutrient metabolism of other coral taxa, such as Alcyoniina (soft corals), remains underexplored. Using stable isotope labeling, we investigated the assimilation of dissolved nitrogen (i.e., ammonium, nitrate, and free amino acids) by multiple species of soft and hard corals sampled in the Gulf of Aqaba in shallow (8–10 m) and mesophotic (40–50 m) reefs. Our results show that dissolved nitrogen assimilation rates per tissue biomass were up to 10-fold higher in hard than in soft coral symbioses for all sources of nitrogen. Although such differences in assimilation rates could be linked to the Symbiodiniaceae density, Symbiodiniaceae species, or the C:N ratio of the host and algal symbiont fractions, none of these parameters were different between the two coral taxa. Instead, the lower assimilation rates in soft coral symbioses might be explained by their different nutritional strategy: whereas soft corals may obtain most of their nitrogen via the capture of planktonic prey by the coral host (heterotrophic feeding), hard corals may rely more on dissolved nitrogen assimilation by their algal symbionts to fulfill their needs. This study highlights different nutritional strategies in soft and hard coral symbioses. A higher reliance on heterotrophy may help soft corals to grow in reefs with higher turbidity, which have a high concentration of particles in suspension in seawater. Further, soft corals may benefit from lower dissolved nitrogen assimilation rates in areas with low water quality.

Distribution, diversity and abundance of coral communities in the coastal waters of Pakistan

2013 ◽  
Vol 94 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Amjad Ali ◽  
Rupert Ormond ◽  
Wera Leujak ◽  
Pirzada Jamal A. Siddiqui
Keyword(s):  
Coastal Waters ◽  
Coral Species ◽  
Soft Coral ◽  
Single Species ◽  
Abundant Species ◽  
Pocillopora Damicornis ◽  
Soft Corals ◽  
Hard Coral ◽  
Black Coral ◽  
Coral Communities

We assessed the distribution, diversity and abundance of corals in Pakistani waters. A total of 29 hard coral species (eight families and 14 genera), one black coral species and eight soft coral species (three families and seven genera) were recorded from 18 dive sites at nine locations along the coastline. Distribution of hard corals was extremely poor at Mubarak Village and Sandspit, and corals were not found at Goth Abdul Rehman, Gadani (Kuchiani) and Buleji. Moderately rich coral communities were recorded at Churna Island and at more exposed sites around Astola Island. By contrast highly diverse hard coral communities, with up to 80% cover, were found only at the northern sheltered side of Astola Island where Favites complanata, Favites pentagona, Coscinaraea monile and Porites nodifera were the most abundant species. Favites complanata was recorded from most dive sites at Astola Island. Porites nodifera and Pocillopora damicornis, and to a lesser extent Porites harrisoni, Leptastrea pruinosa and Psammocora obtusangulata formed large single species stands. No ‘true’ coral reef was found at any dive site; however, the formation of proto-reefs was evident around Astola Island. Soft corals were dominant at most exposed sites, particularly at Ormara (Roadrigues Shoals) and Jiwani. By comparing diversity with other locations in the region, corals distribution and growth appear to be fairly poor in Pakistan.

scholarly journals TUTUPAN KARANG LUNAK DI PERAIRAN DESA PANDANGA KABUPATEN PULAU MOROTAI

2020 ◽  
Vol 5 (1) ◽  
pp. 53-63
Author(s):  
Kismanto Koroy ◽  
Nurafni Nurafni ◽  
Nurman Husain
Keyword(s):  
Coral Reefs ◽  
Reef Flat ◽  
Soft Coral ◽  
Coral Cover ◽  
Biological Activities ◽  
Shallow Waters ◽  
Percent Cover ◽  
Soft Corals ◽  
Hard Coral ◽  
Flat Area

Terumbu karang memiliki keunikan diantara asosiasi atau komunitas lautan yang seluruhnya dibentuk oleh kegiatan biologis. Umumnya terdapat karang keras (hard coral) dan karang lunak (soft coral). Karang lunak (Octocorallia, Alcyonacea) merupakan hewan anggota Colenterata yang hidup di perairan dangkal tropis dan subtropis. Tujuan penelitian ini adalah untuk mengidentifikasi karang lunak, dan menganalisis persen tutupan terumbu karang pada daerah rataan dan daerah tubir di perairan Desa Pandanga, Kabupaten Pulau Morotai. Penelitian ini dilakukan pada bulan November - Desember 2019. Pengambilan data karang menggunakan metode LIT, dengan menetapkan 4 (empat) stasiun pengamatan masing-masing stasiun yang dibagi menjadi 2 (dua) daerah yaitu pada daerah tubir dan rataan. Setiap lifeform karang yang dilewati transek di dokumentasi dalam bentuk gambar yang selanjutnya akan diidentifikasi dan menghitung persentase tutupan karang lunak. Hasil penelitian menunjukan karang lunak yang ditemukan sebanyak 7 (tujuh) genus yaitu Sinularia, Isis, Cladiella, Lobophytum, Sarcophyton, Klyxum, dan Rumphella. Hasil analisis persen tutupan tertinggi untuk semua stasiun terdapat pada genus Sinularia (20,6%) di daerah tubir, sedangkan pada daerah rataan dengan persentase tertinggi terdapat pada genus Lobophytum (8,0%).SOFT CORAL COVERAGE IN PANDANGA VILLAGE WATERS, MOROTAI ISLAND REGENCY. Coral reefs are unique among oceanic associations or communities that are entirely formed by biological activities. Generally there are hard corals and soft corals. Soft corals Octocorallia, Alcyonacea) are members of the Colenterata that live in tropical and subtropical shallow waters. The aim of this study was to identify soft corals and analyze the percent cover of coral reefs in the flat areas and slope areas in the waters of Pandanga Village, Morotai Island Regency. This research was conducted in November - December 2019. The collection of coral data using the LIT method, by determine 4 (four) observation stations of each station which are divided into 2 (two) regions that in reef flat areas and reef slope areas. Each coral lifeform crossed by a transect is in the form of an image which will then be identified and calculate the percentage of soft coral cover. The results showed that there were 7 (seven) genera of soft corals Sinularia, Isis, Cladiella, Lobophytum, Sarcophyton, Klyxum, and Rumphella. The results of the highest percent cover analysis for all stations are in the genus Sinularia (20.6%) in the flat area, in reef flat areas the highest percentage in the genus Lobophytum (8.0%).

scholarly journals Species Diversity and Secondary Metabolites of Sarcophyton-Associated Marine Fungi

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3227
Author(s):  
Yuanwei Liu ◽  
Kishneth Palaniveloo ◽  
Siti Aisyah Alias ◽  
Jaya Seelan Sathiya Seelan
Keyword(s):  
Secondary Metabolites ◽  
Soft Coral ◽  
Marine Fungi ◽  
Indole Alkaloids ◽  
Structural Diversity ◽  
Future Research ◽  
Soft Corals ◽  
Diverse Range ◽  
Symbiotic Relationships ◽  
Bioactive Secondary Metabolites

Soft corals are widely distributed across the globe, especially in the Indo-Pacific region, with Sarcophyton being one of the most abundant genera. To date, there have been 50 species of identified Sarcophyton. These soft corals host a diverse range of marine fungi, which produce chemically diverse, bioactive secondary metabolites as part of their symbiotic nature with the soft coral hosts. The most prolific groups of compounds are terpenoids and indole alkaloids. Annually, there are more bio-active compounds being isolated and characterised. Thus, the importance of the metabolite compilation is very much important for future reference. This paper compiles the diversity of Sarcophyton species and metabolites produced by their associated marine fungi, as well as the bioactivity of these identified compounds. A total of 88 metabolites of structural diversity are highlighted, indicating the huge potential these symbiotic relationships hold for future research.

BIODIVERSITI DAN PEMULIHARAAN TERUMBU KARANG DI TIGA BUAH PULAU, MELAKA (Biodiversity and Conservation of Coral Reefs in Three Islands in Malacca)

2021 ◽  
Vol 22 (1) ◽  
pp. 180-197
Author(s):  
SYAIMAK ISMAIL ◽  
MOHAMAD SAUPI BIN ISMAIL ◽  
MUHAMMAD SAIFUL ISLAM ISMAIL ◽  
AEMY AZIZ
Keyword(s):  
Coral Reefs ◽  
Biodiversity Conservation ◽  
Soft Coral ◽  
Good Condition ◽  
Scuba Diving ◽  
Field Studies ◽  
The State ◽  
Hard Coral ◽  
Wide Range ◽  
State Museum

In the state of Melaka, there are eighteen islands recorded by the Melaka State Museum Corporation (PERZIM). Part of this island serves as a tourist island, and developed islands are also uninhabited islands. However, three islands are recorded to have amazing coral reefs that are still in good condition. The Penang Batu Maung Fisheries Research Institute (AkuaTAR) has conducted a study on the biodiversity of coral reefs around the waters of Pulau Dodol, Pulau Serimbun, and Pulau Undan. AkuaTAR researchers are using scuba diving methods, and at the same time, they did conservation on coral reefs that have been identified in the waters of the Straits of Melaka. The objective of this study is to record the types of community forms such as living corals and identify the species of coral reefs found in three islands in the state of Melaka in Pulau Undan, Pulau Dodol, and Pulau Serimbun. The study also implemented method observation by conducting field studies on the islands involved by doing scuba diving. Results and discussion of the search, these three islands are located in very clean, uninhabited waters. They have a wide range of coral biodiversity using soft coral reefs and hard coral reefs. The study also found that the three islands in the state have the largest coral reefs in the waters of the Straits of Melaka. Keywords: Biodiversity; Conservation; Coral; Three island; Melaka

Chlorinated and brominated persistent compounds in hard coral, soft coral, and parrotfish from remote Mascarene islands

Chemosphere ◽  
2021 ◽  
Vol 267 ◽  
pp. 129316
Author(s):  
Veronica van der Schyff ◽  
Marinus du Preez ◽  
Karin Blom ◽  
Nee Sun Choong Kwet Yive ◽  
Jana Klánová ◽  
...  
Keyword(s):  
Soft Coral ◽  
Hard Coral ◽  
Mascarene Islands

scholarly journals Flexibility of nutritional strategies within a mutualism: food availability affects algal symbiont productivity in two congeneric sea anemone species

2020 ◽  
Vol 287 (1940) ◽  
pp. 20201860
Author(s):  
Samuel A. Bedgood ◽  
Sarah E. Mastroni ◽  
Matthew E. S. Bracken
Keyword(s):  
Food Availability ◽  
Sea Anemone ◽  
Symbiotic Association ◽  
Sea Anemones ◽  
External Resources ◽  
Carbon And Nitrogen ◽  
Algal Symbionts ◽  
Algal Symbiont ◽  
Nutritional Strategy ◽  
Nutritional Strategies

Mutualistic symbioses are common, especially in nutrient-poor environments where an association between hosts and symbionts can allow the symbiotic partners to persist and collectively out-compete non-symbiotic species. Usually these mutualisms are built on an intimate transfer of energy and nutrients (e.g. carbon and nitrogen) between host and symbiont. However, resource availability is not consistent, and the benefit of the symbiotic association can depend on the availability of resources to mutualists. We manipulated the diets of two temperate sea anemone species in the genus Anthopleura in the field and recorded the responses of sea anemones and algal symbionts in the family Symbiodiniaceae to our treatments. Algal symbiont density, symbiont volume and photosynthetic efficiency of symbionts responded to changes in sea anemone diet, but the responses depended on the species of sea anemone. We suggest that temperate sea anemones and their symbionts can respond to changes in anemone diet, modifying the balance between heterotrophy and autotrophy in the symbiosis. Our data support the hypothesis that symbionts are upregulated or downregulated based on food availability, allowing for a flexible nutritional strategy based on external resources.

Studies of Australian soft corals. VI - a new cembranolide diterpene from the soft coral lobophytum crassum

1977 ◽  
Vol 18 (41) ◽  
pp. 3661-3662 ◽  
Author(s):  
B.F. Bowden ◽  
J.A. Brittle ◽  
J.C. Coll ◽  
N. Liyanage ◽  
S.J. Mitchell ◽  
...  
Keyword(s):  
Soft Coral ◽  
Soft Corals

Studies of Australian soft corals. IX. A novel nor-diterpene from the soft coral Sinularia leptoclados

1978 ◽  
Vol 31 (9) ◽  
pp. 2049 ◽  
Author(s):  
BF Bowden ◽  
JC Coll ◽  
SJ Mitchell ◽  
J Mulder ◽  
GJ Stokie
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
Soft Coral ◽  
Parent Compound ◽  
Soft Corals ◽  
X Ray

The structure of a novel nor-cembranoid diterpene of formula C19H24O6 (1) is reported. The compound was extracted from the soft coral Sinularia leptoclados, and spectroscopic data were collected on the parent compound (1) and a series of derivatives. It was not possible to assign an unambiguous structure on purely spectroscopic grounds, and so single-crystal X-ray analysis was used to prove the structure (1): (4R*,8S*,11R*,13S*,14R*)-14-hydroxy-4-isopropenyl-11-methyl-6,9-dioxo-8,11-epoxycyclotetradec-1-ene-1,13-carbolactone.

scholarly journals Chemical Diversity of Soft Coral Steroids and Their Pharmacological Activities

Marine Drugs ◽  
2020 ◽  
Vol 18 (12) ◽  
pp. 613
Author(s):  
Ekaterina V. Ermolenko ◽  
Andrey B. Imbs ◽  
Tatyana A. Gloriozova ◽  
Vladimir V. Poroikov ◽  
Tatyana V. Sikorskaya ◽  
...  
Keyword(s):  
Pharmacological Activity ◽  
Confidence Level ◽  
Soft Coral ◽  
Chemical Diversity ◽  
Soft Corals ◽  
Related Activity ◽  
Pharmacological Activities ◽  
Steroid Glycosides ◽  
Different Types ◽  
Specific Activities

The review is devoted to the chemical diversity of steroids produced by soft corals and their determined and potential activities. There are about 200 steroids that belong to different types of steroids such as secosteroids, spirosteroids, epoxy- and peroxy-steroids, steroid glycosides, halogenated steroids, polyoxygenated steroids and steroids containing sulfur or nitrogen heteroatoms. Of greatest interest is the pharmacological activity of these steroids. More than 40 steroids exhibit antitumor and related activity with a confidence level of over 90 percent. A group of 32 steroids shows anti-hypercholesterolemic activity with over 90 percent confidence. Ten steroids exhibit anti-inflammatory activity and 20 steroids can be classified as respiratory analeptic drugs. Several steroids exhibit rather rare and very specific activities. Steroids exhibit anti-osteoporotic properties and can be used to treat osteoporosis, as well as have strong anti-eczemic and anti-psoriatic properties and antispasmodic properties. Thus, this review is probably the first and exclusive to present the known as well as the potential pharmacological activities of 200 marine steroids.

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