Ramesh CH

Ramesh CH
National Institute of Oceanography | nio · Biological Oceanography Division ( BOD )

M.Sc & PhD in Marine Biology

About

117
Publications
50,262
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
500
Citations
Citations since 2017
94 Research Items
475 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
Bioluminescence, Fluorescence, Pigments, Coral Reefs, Deep-sea Biology, Evolution of life, Marine molecular ecology
Additional affiliations
September 2019 - present
National Institute of Oceanography
Position
  • Researcher
September 2018 - September 2019
National Centre for Coastal Research
Position
  • Researcher
September 2016 - August 2018
National Institute of Ocean Technology
Position
  • PostDoc Position
Education
September 2011 - August 2016
Pondicherry University
Field of study
  • Marine Biology
June 2009 - April 2011
Andhra University
Field of study
  • Marine Biology and Fisheries
June 2006 - April 2009
Andhra Christian College
Andhra Christian College
Field of study
  • Botany Zoology Chemistry

Publications

Publications (117)
Article
Full-text available
In 2021, a reef restoration programme was introduced to the selected sites of Palk Bay to improve coral nurseries and assist with the establishment of artificial reefs by implementing local coral transplantation. To monitor the growth and survival of transplanted corals, numerous fish assemblages have been observed in restoration sites which are po...
Article
Full-text available
Pigments from bacteria, fungi, yeast, cyanobacteria, and microalgae have been gaining more demand in the food, leather, and textile industries due to their natural origin and effective bioactive functions. Mass production of microbial pigments using inexpensive and ecofriendly agro-industrial residues is gaining more demand in the current research...
Article
Full-text available
The global emergence of antimicrobial resistance (AMR) needs no emphasis. In this study, the in vitro stability, safety, and antimicrobial efficacy of nanosilver-entrapped cinnamaldehyde (AgC) against multi-drug-resistant (MDR) strains of enteroaggregative Escherichia coli (EAEC) were investigated. Further, the in vivo antibacterial efficacy of AgC...
Article
Since the discovery of the Green fluorescent protein from crystal jellyfish Aequorea victoria, many fluorescent organisms have been identified from different parts of the world. As a result, various fluorescent proteins such as GFP, RFP, and DsRed are discovered and widely used in genetic engineering studies to label a wide range of proteins and ge...
Article
Full-text available
The occurrence of polypropylene and polyethylene bags in the coral reefs of the Mandapam group of Islands has become a concern. These plastic bags pose a potential threat to corals, reef-associated animals, and divers. Field surveys were conducted to track the source of origin of these plastics along the islands and mainland beaches. This study ind...
Chapter
Seaweeds are a commanding component of the marine plant life complex in the structure of coastal environmental biodiversity, and they are functioning as renewable living wherewithal to the global coastal communities. They are the source materials approximately for 27 health benefits and varied makeup applications. The important applications of seaw...
Article
Aims: Present study aims to highlight an accidental death of a male Dwarf Sperm Whale scientifically known as Kogia sima which found to be as Least Concern (LC) as per IUCN Red List data. Kogia sima represents important higher trophics of marine ecosystem which faced the several threats and conservation need in Gulf of Mannar, India. Study Design:...
Article
Bioluminescence is a natural light emitting phenomenon that occurs due to a chemical reaction between luciferin and luciferase. It is primarily an innate and inherited trait in most terrestrial luminous organisms. However, most luminous organisms produce light in the ocean by acquiring luminous symbionts, luciferin (substrate), and/or luciferase (e...
Article
Bioluminescence is a natural light emitting phenomenon that occurs due to a chemical reaction between luciferin and luciferase. It is primarily an innate and inherited trait in most terrestrial luminous organisms. However, most luminous organisms produce light in the ocean by acquiring luminous symbionts, luciferin (substrate), and/or luciferase (e...
Article
Full-text available
Marine Streptomyces species are underexplored for their pigment molecules and genes. In this study, we report the genome of the undecylprodigiosin biosynthesizing gene cluster carrying Streptomyces sp. strain BSE6.1, displaying antioxidant, antimicrobial, and staining properties. This Gram-positive obligate aerobic bacterium was isolated from the c...
Article
Full-text available
Seaweed exploitation in mainland India was started in early 1970s for various applications. The checklist of seaweeds of mainland India was well documented during 2001. However, rich marine macroalgal diversity found in island ecosystems of Andaman and Nicobar Islands have not been explored until today due to inaccessibility to most remote and prot...
Article
Full-text available
Coral bleaching now becomes an annual phenomenon in Gulf of Mannar (GoM) and Palk Bay (PB). In 2019 and 2020, reefs are completely bleached by the effect of high sea surface temperature which not only impinge on the reef building corals but also triggers the growth of unwanted macroalgae in live reefs. The consequences of this major threats are lon...
Article
Full-text available
The term bioluminescence refers to a conspicuous light emission displayed by numerous aquatic and terrestrial organisms. This phenomenon has so far not been observed in several taxonomic groups like archaea, protista, platyhelminthes, chelicerata, cephalochordata, amphibians, reptiles, birds, plants, and mammals. However, some luminescent bacteria,...
Article
Toxic heavy metals pollution posed severe health hazards to the environment and biodiversity. Therefore, the development of rapid and non-invasive bioassays is in the race to monitor toxic chemicals using novel approaches. This study isolated and characterized an intense blue luminescence-producing marine bacteria, Vibrio campbellii STF1, for biose...
Article
Full-text available
The term bioluminescence refers to a conspicuous light emission displayed by numerous aquatic and terrestrial organisms. This phenomenon has so far not been observed in several taxonomic groups like archaea, protista, platyhelminthes, chelicerata, cephalochordata, amphibians, reptiles, birds, plants, and mammals. However, some luminescent bacteria,...
Article
Full-text available
Marine tunicates are identified as a potential source of marine natural products (MNPs), demonstrating a wide range of biological properties, like antimicrobial and anticancer activities. The symbiotic relationship between tunicates and specific microbial groups has revealed the acquisition of microbial compounds by tunicates for defensive purpose....
Article
In April 2019, massive blooms of Trichodesmium erythraeum (8×10 5 filaments/ml) forming several long chains extended up to few kilometres were observed nearby the Mandapam group of islands, Southeast coast of India, Tamil Nadu. Bloom of Synechococcus sp. (3×10 5 cells/ml) was also recorded near the Kundukal jetty, Mandapam region merely. There were...
Article
Full-text available
Mass mortality of sea urchin, Salmacis virgulata scattered over the periphery of Dhanushkodi beach, was observed on February 13, 2019. More than 100 numbers of recently dead and dying specimens were found within a 10 m 2 area on the sandy beach. Beach profiles indicated several hundreds of exoskeletons of previously dead S. virgulata were washed as...
Article
Full-text available
Coral reefs provide a suitable habitat for many marine flora and fauna. Zoanthid is one of the most common inhabitants in coral reef habitats. A sub-massive colony of Sphenopid Zoanthid species Palythoa tuberculosa belonging to the order Zoantharia was documented for the first time from Gulf of Mannar (GoM) during an intensive coral reef monitoring...
Article
Full-text available
Coral reefs provide a suitable habitat for many marine flora and fauna. Zoanthid is one of the most common inhabitants in coral reef habitats. A sub-massive colony of Sphenopid Zoanthid species Palythoa tuberculosa belonging to the order Zoantharia was documented for the first time from Gulf of Mannar (GoM) during an intensive coral reef monitoring...
Article
Full-text available
Rhodoliths are the prominent global reef builders, providing a hard calcium carbonate substrate to develop coral polyps and several marine algae. Studies on rhodoliths in the Gulf of Mannar Biosphere Reserve are very scarce. The present study investigated the various forms of crustose coralline algae inhabiting coral reefs in three islands of the G...
Article
Full-text available
Microbial pigments play multiple roles in the ecosystem construction, survival, and fitness of all kinds of organisms. Considerably, microbial (bacteria, fungi, yeast, and microalgae) pigments offer a wide array of food, drug, colorants, dyes, and imaging applications. In contrast to the natural pigments from microbes, synthetic colorants are widel...
Article
Full-text available
A massive Scyphozoan jellyfish bloom has been encountered in branching coral, Acropora dominated reef area in the southern part of Hare Island of Gulf of Mannar region, Tamil Nadu. The live specimens were identified as Pelagia noctiluca (Forskål, 1775), adding a new occurrence record to the Gulf of Mannar biodiversity. A sudden outburst of P. nocti...
Article
Several kilometers of green tides (GT) formed by seaweed and seagrass were recently observed in intertidal, swash, and shallow subtidal zones of Palk Bay and Gulf of Mannar regions, southeast coast of Tamil Nadu, India. On a finer scale (few hundreds of Kgs), GT of Ulva rigida observed in the Palk Bay region during November 2018 was due to eutrophi...
Article
Full-text available
The phytoplankton diversity, distribution, density and their relationships to physicochemical variables were investigated using multivariate analyses. Day and night samples were collected monthly between November 2011 and April 2012 from two different stations, Chatham and Junglighat in South Andaman Island. A total of 204 species and 65 genera wer...
Article
Full-text available
Several kilometers of green tides (GT) formed by seaweed and seagrass were recently observed in intertidal, swash, and shallow subtidal zones of Palk Bay and Gulf of Mannar regions, southeast coast of Tamil Nadu, India. On a finer scale (few hundreds of Kgs), GT of Ulva rigida observed in the Palk Bay region during November 2018 was due to eutrophi...
Article
Full-text available
The phytoplankton diversity, distribution, density and their relationships to physicochemical variables were investigated using multivariate analyses. Day and night samples were collected monthly between November 2011 and April 2012 from two different stations, Chatham and Junglighat in South Andaman Island. A total of 204 species and 65 genera wer...
Article
Full-text available
The inception of bioluminescence by Harvey (1952) has led to a Nobel Prize to Osamu Shimomura (Chemistry, 2008) in biological research. Consequently, in recent years, bioluminescence-based assays to monitor toxic pollutants as a real-time marker, to study various diseases and their propagation in plants and animals, are developed in many countries....
Article
The discovery of green fluorescent protein (GFP) from jellyfish Aequorea victoria has provoked numerous studies to unveil the myriads of biomedical applications. Consequently, several studies also revealed the prevalence of fluorescence in different marine and terrestrial organisms. However, since GFP's discovery or the Nobel prize award on GFP, th...
Article
Full-text available
Seagrasses are unique marine flowering plants that play an important ecological role by yielding primary production and carbon sequestration to the marine environment. Seagrass ecosystems are rich in organic matter, supporting the growth of bio-medically important epi and endophytic microorganisms and harbor rich marine biodiversity. They are an es...
Article
Full-text available
Heat sensitive pigment production by various coral forms has been observed in the reef flats of Gulf of Mannar Marine Biosphere Reserve, southeast coast of Tamil Nadu, India. Around 13% corals have produced purple-blue pigmentation to yellowish cream colors. These colors indicate the immunity response of corals to tolerate heat stress during bleach...
Article
The diversity, distribution, and mechanisms of bacterial speciation of Vibrio species belonging to Harveyi clade are an important global research interests due to their pathogenic activity in coastal environments. Luminous bacteria are also known to act as environmental indicators in coastal waters. This study demonstrates that luminous bacteria be...
Article
Full-text available
Coral bleaching in Gulf of Mannar and Palk Bay was encountered while intensive reef health monitoring surveys conducted during the month of April to May, 2019. Surveys were carried out at 12 different locations of Gulf of Mannar and 2 locations of Palk Bay region. Reef building coral genera Porites sp., Acropora sp., Montipora sp., Favites sp., and...
Article
The global climate change is known to involve in the decline of biodiversity from different ecosystems, including coral reefs worldwide. The spatial distribution of reef associated flora and fauna in the Gulf of Mannar (GoM) Marine Biosphere Reserve (GOMMBR) are declined due to damage of coral reefs by three major global problems observed in coral...
Article
Full-text available
On 11 th September, 2019, coastal waters near to offshore islands of Mandapam region appeared in dark green colour, which is caused by bioluminescent dinoflagellate Noctiluca scintillans, commonly called as Sea Sparkle. Extensive monitoring was carried out during 11 th to 25 th September, 2019 to assess the impact of this bloom on offshore islands...
Article
Full-text available
The application of marine plants such as seagrasses, seaweeds and mangroves for the production of perfumes are relatively less familiar to perfume industry. In the present study, a red seaweed Portieria hornemannii showing strong fragrance, collected from coral reefs of Gulf of Mannar, southeast coast of Tamil Nadu, India is proposed as a potential...
Article
The diversity, distribution, and mechanisms of bacterial speciation of Vibrio species belonging to Harveyi clade are an important global research interests due to their pathogenic activity in coastal environments. Luminous bacteria are also known to act as environmental indicators in coastal waters. This study demonstrates that luminous bacteria be...
Article
Full-text available
Coral reefs in the Gulf of Mannar (GoM) and Palk Bay regions are facing potential threats from climate change, sedimentation and anthropogenic activities. Considerably, coral reefs in these two regions are highly damaged due to frequent bleaching events caused by increased sea surface temperature (SST) recorded over the past two decades. Recently,...
Article
Full-text available
The present study investigated luminous bacterial species composition from non-bioluminescent big fin reef squid, Sepioteuthis lessoniana for the first time and revealed a new insight on the occurrence of five distinct luminous bacterial species such as Vibrio harveyi, V. campbellii, V. vulnificus, V. alginolyticus and Photobacterium damselae indic...
Article
Since past three decades, coral reefs of the world are degrading at large scales due to climate change and through combination of anthropogenic and natural disturbances. Coral reefs in the 21 islands of Gulf of Mannar Marine Biosphere Reserve, Southeast coast of Tamil Nadu, India are also greatly damaged by frequent bleaching events, destructive fi...
Article
Full-text available
This study is aimed to determine the distribution, diversity and bioprospecting aspects of marine pigmented bacteria (MPB) isolated from pristine Andaman Islands, India. A total of 180 samples including seawater, sediment, marine plants, invertebrates, and vertebrates were collected and investigated for isolating pigmented bacteria. Results reveale...
Article
Full-text available
Occurrence of massive blooms of dinoflagellates and other phytoplankton species in the coastal waters indicate the health condition of coastal waters. Dinoflagellate blooms reported around the world are known to be harmful to the coastal marine flora and faunal communities. Therefore monitoring such blooms occurring in the coastal waters are import...
Article
Bacterial bioluminescence is emitted due to regulation by lux genes present on the chromosomal DNA. Earlier studies have attempted to find possible occurrence of lux genes on plasmid DNA (pDNA) but did not find such incident. Evidently, the present study reveals the rare incidence of luxA gene on pDNA analysed using poly-merase chain reaction. We d...
Article
Full-text available
Indigenous and non-indigenous invasive algal species introduction or prevalence is one of the major conce rns to protect the native coastal environment. Globally, several studies have reported the effect of invasive alga Caulerpa on coral reefs. To establish the genetic variation between indigenous and non-indigenous invasive species, attempts have...
Article
Full-text available
Geologic processes are the major drivers for constructive and destructive topography of Island and mainland. Therefore, understanding these processes is of great importance to protect the coastal lands from erosion. Although coral reefs of Gulf of Mannar (GoM) and Palk Bay regions are well studied, several other geological aspects are apparently sc...
Article
Full-text available
During an intensive coral reef monitoring survey at Hare Island and Manoli Island under Mandapam group of Islands, and Valimunai Island of Keezhakarai group, in the month of February 2019, the common brittle star Ophiactis savignyi was found inside the tissue of chocolate sponge Spheciospongia sp. Adult, young and juveniles of O. savignyi were enco...
Article
Luminous fireflies are a roadside attraction group of insects which act as environmental indicators and indicate the quality of surrounding milieus. However, recent studies suggest that water pollution and climate change are involved in the decline of firefly populations around the world, and have sounded an alarm regarding the conservation of the...
Article
Full-text available
In the present study bleaching of different sea anemone species such as Stichodactyla mertensii, Stichodactyla gigantean, Stichodactyla spp., Stichodactyla haddoni, and Cryptodendrum spp. were observed from Appa Island in Gulf of Mannar region. This bleaching was due to elevated sea surface water temperature.
Article
Full-text available
Reef associated ascidians are least studied from coral reef environments of Gulf of Mannar region. The present study observed the infestations of two ascidians on coral reef biota of Hare Island in Gulf of Mannar region, southeast coast of Tamil Nadu, India. These two ascidian species are observed to cause smothering on reef biota. Therefore, it is...
Article
Full-text available
Coral Reefs in Gulf of Mannar is degrading with fatser rate due to several environmental stress over the past few decades. Under this severe degredation phase, our work has observed significant coral recruitment at Hare Island and Manoli & Manoliputti Island of Gulf of Mannar. Occurrenc of new recruitment of corals increseas the live coral cover pe...
Article
Full-text available
Coral Reefs in Gulf of Mannar is degrading with fatser rate due to several environmental stress over the past few decades. Under this severe degredation phase, our work has observed significant coral recruitment at Hare Island and Manoli & Manoliputti Island of Gulf of Mannar. Occurrenc of new recruitment of corals increseas the live coral cover pe...
Article
Full-text available
Coral reefs are extensively studied around the world with regard to their taxonomy, distribution, diversity, bleaching events, diseases, conservation, and restoration aspects. However, exhibition of blue pigmentation by corals under certain stressed condition such as high temperature and bleaching events has not been widely investigated. In the...
Article
Full-text available
Current days enzymes obtained from the marine microorganisms are gaining global market value because of their unique nature and catalytic properties. Marine is a complex environment and has vastly diversified ecosystem. Organisms which live in this environment secrete multifarious enzyme systems to become accustomed to surrounding habitats. Marine...
Article
Full-text available
The present perspective discusses the current need for following the standard journal citation to researchers, scientists and new comers into research field. Based on the current situation, we understand that standard citation style would certainly help everyone to progress their research. This universal style will play an important role in saving...
Article
Full-text available
Coral reefs in the Gulf of Mannar Marine Biosphere Reserve (GOMMBR) have been facing potential threats from bleaching, sedimentation and significantly algal assemblages. In the present study, bloom of cyanobacterium Lyngbya majuscula overgrowing reef building corals Acropora sp., Porites sp., Echinopora sp. and Goniastrea sp. was observed in Poovar...
Article
Full-text available
A rare habitat of massive coral Porites lutea growing on concrete manhole rings was observed at Vedalai coastal waters in the present study. This coral species is attacked by boring sponge Cliona sp. which is usually prevalent in coral reef areas. Interestingly, this boring sponge, Cliona sp. attacking P. lutea was also observed to be attacked by a...
Article
Full-text available
Antimicrobial properties of several nonpigmented bacteria isolated from the marine environment have been well understood. However, marine bacteria with distinct asset of pigmentation have not been studied intensively and explored unlike nonpigmented bacteria. Recently, several studies have found multidrug-resistant microbes against various diseases...
Article
Full-text available
Coral reef is vulnerable marine ecosystem which critically responses to the trifling environmental changes. Presently, this ecosystem is degrading at an alarming rate due to climate change impacts. Coral recruitment acts as positive health indicator for degraded reef ecosystem. During coral reef monitoring survey at Keezhakarai group of Islands in...
Article
Full-text available
Microbial oddities such as versatile pigments are gaining more attention in current research due to their widely perceived applications as natural food colorants, textiles, antimicrobial activities, and cytotoxic activities. This indicates that the future generation will depend on microbial pigments over synthetic colorants for sustainable liveliho...
Article
Full-text available
Gulf of Mannar Marine Biosphere Reserve (GOMMBRE) is the first marine biosphere reserve in India and Southeast Asia. It has a rich marine biodiversity including coral reefs, but now facing threats from different environmental factors and anthropogenic interferences. Particularly, coral reefs distributed in the 21 islands under the Gulf of Mannar (G...
Article
Full-text available
Soldier crab Dotilla myctiroides distributed in the Indian coast are usually espied in large numbers of dozens to hundreds on sandy beaches. However, in a rare occurrence, an unusual swarm movement of D. myctiroides was observed near shoreward side of Kundukal Bay, Pamban, on the southeast coast of Mandapam area under the Gulf of Mannar region. Thi...
Article
Full-text available
The increasing anthropogenic activities, especially plastic dumping and fishing operations in the ocean have become potential threats to several marine animals including sea turtles. Directly or indirectly, turtles are reported to face mortality due to the lack of regular monitoring of coastal activities, mainly the fisheries operations. The presen...
Article
The present study is aimed to determine the draft genome of novel species of Zooshikella strain S2.1, a potential red pigmented strain isolated recently from the coastal sediment of Andaman and Nicobar Islands, India. This Gram negative, rod shaped aerobic bacterium produces pink, yellowish-red and dark red with metallic green sheen pigmentation on...
Article
Full-text available
Luminous bacteria are light emitting prokaryotes found in terrestrial, freshwater and mostly in marine environments. The taxonomy, ecology and pathogenicity of several luminous bacterial species (except Aliivibrio fischeri, Vibrio harveyi, Photobacterium leiognathi, P. phosphoreum, Photorhabdus luminescens and Shewanella hanedai) have not been deli...