scholarly journals Variation in black and white band disease progression in corals of the Gulf of Mannar and Palk Bay, Southeastern India

2014 ◽  
Vol 110 (3) ◽  
pp. 227-234 ◽  
Author(s):  
T Thinesh ◽  
G Mathews ◽  
KD Raj ◽  
JK Patterson Edward
Keyword(s):  
Disease Progression ◽  
Gulf Of Mannar ◽  
Black And White ◽  
White Band ◽  
Palk Bay ◽  
White Band Disease

Production of Novel Bioactive Compounds by the Bacteria Associated with Some Marine Sponges of Gulf of Mannar and Palk Bay, Southeast Coast of India

2018 ◽  
Vol 6 (8) ◽  
pp. 183
Author(s):  
V. Ramadas ◽  
G. Chandralega
Keyword(s):  
Bioactive Compounds ◽  
Bacterial Species ◽  
Marine Sponges ◽  
Marine Organisms ◽  
Gulf Of Mannar ◽  
Bacterial Symbionts ◽  
Palk Bay ◽  
Excellent Source

Sponges, exclusively are aquatic and mostly marine, are found from the deepest oceans to the edge of the sea. There are approximately 15,000 species of sponges in the world, of which, 150 occur in freshwater, but only about 17 are of commercial value. A total of 486 species of sponges have been identified in India. In the Gulf of Mannar and Palk Bay a maximum of 319 species of sponges have been recorded. It has been proved that marine organisms are excellent source of bioactive secondary metabolites and number of compounds of originated from marine organisms had been reported to possess in-vitro and in-vivo immuno stimulatory activity. Extracts from 20 sponge species were tested for bacterial symbionts and bioactive compounds were isolated from such associated bacterial species in the present study.

scholarly journals Blue carbon stock of the seagrass meadows of Gulf of Mannar and Palk Bay off Coromandel Coast, south India

2020 ◽  
Vol 67 (4) ◽  
Author(s):  
P. Kaladharan ◽  
P.U. Zacharia ◽  
S. Thirumalaiselvan ◽  
A. Anasukoya ◽  
Lavanya Ratheesh ◽  
...  
Keyword(s):  
Carbon Stock ◽  
South India ◽  
Blue Carbon ◽  
Gulf Of Mannar ◽  
Organic Carbon Content ◽  
Seagrass Meadows ◽  
Soil Carbon Density ◽  
Palk Bay ◽  
Syringodium Isoetifolium ◽  
Coromandel Coast

Blue carbon stock of the seagrass meadows of Gulf of Mannar and Palk Bay, off Coromandel Coast, south India, were computed from the organic carbon content and dry bulk densities of sediment core taken from the seagrass meadows of these two ecosystems. The Gulf of Mannar (GoM) and Palk Bay (PB) harbour 13 seagrass species dominated by Cymodocea serrulata and Syringodium isoetifolium. The soil carbon density of both GoM and PB were higher in subsurface cores. The blue carbon stock of seagrass meadows of the GoM was estimated as 0.001782 Tg and that of PB as 0.043996 Tg. The estimated value of blue carbon stored in seagrass meadows of GoM was 17820 US$ and that of PB was 43,99,682 US$. The results of this study are discussed in the light of climate change mitigation, emphasising the need to conserve these underwater meadows.

scholarly journals Experimental antibiotic treatment identifies potential pathogens of white band disease in the endangered Caribbean coral Acropora cervicornis

2014 ◽  
Vol 281 (1788) ◽  
pp. 20140094 ◽  
Author(s):  
M. J. Sweet ◽  
A. Croquer ◽  
J. C. Bythell
Keyword(s):  
Coral Disease ◽  
Causal Agent ◽  
Acropora Palmata ◽  
Acropora Cervicornis ◽  
Coral Diseases ◽  
White Band ◽  
Disease Causation ◽  
Community Shifts ◽  
White Band Disease ◽  
Experimental Treatments

Coral diseases have been increasingly reported over the past few decades and are a major contributor to coral decline worldwide. The Caribbean, in particular, has been noted as a hotspot for coral disease, and the aptly named white syndromes have caused the decline of the dominant reef building corals throughout their range. White band disease (WBD) has been implicated in the dramatic loss of Acropora cervicornis and Acropora palmata since the 1970s, resulting in both species being listed as critically endangered on the International Union for Conservation of Nature Red list. The causal agent of WBD remains unknown, although recent studies based on challenge experiments with filtrate from infected hosts concluded that the disease is probably caused by bacteria. Here, we report an experiment using four different antibiotic treatments, targeting different members of the disease-associated microbial community. Two antibiotics, ampicillin and paromomycin, arrested the disease completely, and by comparing with community shifts brought about by treatments that did not arrest the disease, we have identified the likely candidate causal agent or agents of WBD. Our interpretation of the experimental treatments is that one or a combination of up to three specific bacterial types, detected consistently in diseased corals but not detectable in healthy corals, are likely causal agents of WBD. In addition, a histophagous ciliate ( Philaster lucinda ) identical to that found consistently in association with white syndrome in Indo-Pacific acroporas was also consistently detected in all WBD samples and absent in healthy coral. Treatment with metronidazole reduced it to below detection limits, but did not arrest the disease. However, the microscopic disease signs changed, suggesting a secondary role in disease causation for this ciliate. In future studies to identify a causal agent of WBD via tests of Henle–Koch's postulates, it will be vital to experimentally control for populations of the other potential pathogens identified in this study.

Community-Based 16S rDNA Fingerprinting Analysis of Geographically Distinct Marine Sediments of Unexplored Coastal Regions of Palk Bay and Gulf of Mannar

2022 ◽  
Vol 79 (2) ◽  
Author(s):  
Chairmandurai Aravindraja ◽  
Dharmaprakash Viszwapriya ◽  
Alaguvel Valliammai ◽  
Shunmugiah Karutha Pandian
Keyword(s):  
16S Rdna ◽  
Marine Sediments ◽  
Gulf Of Mannar ◽  
Coastal Regions ◽  
Community Based ◽  
Fingerprinting Analysis ◽  
Palk Bay

Ocean currents structuring the mesozooplankton in the Gulf of Mannar and the Palk Bay, southeast coast of India

2013 ◽  
Vol 110 ◽  
pp. 27-48 ◽  
Author(s):  
L. Jagadeesan ◽  
R. Jyothibabu ◽  
A. Anjusha ◽  
Arya P. Mohan ◽  
N.V. Madhu ◽  
...  
Keyword(s):  
Ocean Currents ◽  
Gulf Of Mannar ◽  
Southeast Coast Of India ◽  
Southeast Coast ◽  
Palk Bay

scholarly journals Distribution Pattern of Seahorse species (Genus: Hippocampus) in Tamilnadu and Kerala Coasts of India

2013 ◽  
Vol 5 (1) ◽  
pp. 20-24 ◽  
Author(s):  
Aaron Premnath LIPTON ◽  
Muthusamy THANGARAJ
Keyword(s):  
Dominant Species ◽  
Body Shape ◽  
Tail Length ◽  
Gulf Of Mannar ◽  
Meristic Characters ◽  
Trunk Length ◽  
Snout Length ◽  
Shrimp Trawl ◽  
Palk Bay ◽  
By Catch

The survey along the Tamilnadu and Kerala coats of India reveled that six species of seahors (Hippocampus fuscus, H. kelloggi, H. kuda, H. histrix H. mohnikei and H. trimaculatus) were distributed with different density. Out of the six species, H. fuscus, H. kuda and H. trimaculatus, were the commonly available species in all the observed areas. In Palk Bay, H. kuda was the dominant species constituting 49.10% of the total seahorses encountered. Hippocampus trimaculatus was the second dominant species which accounting 39.28%. The Gulf of Mannar region also most abounded with H. kuda (68.98%) followed by H. trimaculatus (20.80%), H. fuscus (9.80%), H. kelloggi (2.23%) and H. histrix (0.37%). In Kerala coast, H. trimaculatus was the dominant species (79.68%) followed by H. kuda (9.89%), H. kelloggi (8.33%) and H. fuscus (2.08%). To infer the variation of six seahorse species the morphometric and meristic characters were analysed. The important morphometric and meristic characters are trunk rings, tail rings, pectoral and dorsal fin rays, trunk length, tail length, coronet height, head length, snout length, snout depth and head depth. Variation in overall body shape, relative snout length, coronet height, number of tail ring was sufficient to separate the specimens to Hippocampus fuscus, H. kelloggi, H. kuda, H. histrix H. mohnikei and H.trimaculatus. The species density and diversity depends on the habitat and biogeography of those areas. Majority of seahorse fishing in Tamilnadu was by shrimp trawl, by-catch and very few target catch by divers also seen in some villages of Palk Bay and Gulf of Mannar region. The shrimp trawl by-catch only bringing more H. trimaculatus than the other species in Kerala coasts.

Contemporary white-band disease in Caribbean corals driven by climate change

2015 ◽  
Vol 5 (4) ◽  
pp. 375-379 ◽  
Author(s):  
C. J. Randall ◽  
R. van Woesik
Keyword(s):  
Climate Change ◽  
White Band ◽  
White Band Disease
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