Enhanced chlorophyllaand primary production in the northern Arabian Sea during the spring intermonsoon due to greenNoctilucascintillansbloom

Madhu, N.V.; Jyothibabu, R.; Maheswaran, P. A.; Jayaraj, K. A.; Achuthankutty, C.T.

doi:10.1080/17451000.2011.605143

Cited by 36 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observational data during the present expedition indicated favourable condition for Noctiluca bloom. However, no such signature was observed as reported earlier in the same geographical area 3 , 13 , 23 . On the contrary, the area was found to be dominated by picophytoplankton (77–85%).…”

Section: Resultscontrasting

confidence: 48%

Physicochemical controls on the initiation of phytoplankton bloom during the winter monsoon in the Arabian Sea

Lakshmi

Prakash

Lotliker

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Occurrence of phytoplankton bloom in the northern Arabian Sea (NAS) during the winter monsoon is perplexing. The convective mixing leads to a deeper and well-oxygenated (> 95% saturation) mixed layer. We encountered low chlorophyll conditions though the nutrient conditions were favorable for a bloom. The mean ratio of silicate (Si) to DIN (Dissolved Inorganic Nitrogen: nitrate + nitrite + ammonium) in the euphotic zone was 0.52 indicating a “silicate-stressed” condition for the proliferation of diatoms. Also, the euphotic depth was much shallower (~ 49 m) than the mixed layer (~ 110 m) suggesting the Sverdrup critical depth limitation in the NAS. We show that the bloom in this region initiates only when the mixed layer shoals towards the euphotic zone. Our observations further suggest that two primary factors, the stoichiometric ratio of nutrients, especially the Si/DIN ratio, in the mixed layer and re-stratification of the upper water column, govern the phytoplankton blooming in NAS during the later winter monsoon. The important finding of the present study is that the Sverdrup’s critical depth limitation gives rise to the observed low chl-a concentration in the NAS, despite having enough nutrients.

show abstract

Section: Resultscontrasting

confidence: 48%

Physicochemical controls on the initiation of phytoplankton bloom during the winter monsoon in the Arabian Sea

Lakshmi

Prakash

Lotliker

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The NoctilucaPedinomonas association is regularly observed in the tropical and subtropical areas of Southeast Asia (e.g., Thailand, India, Philippines, New Guinea) in the Indian and Pacifi c Oceans, and in the Red Sea (Harrison et al 2011 ). In these regions, the Noctiluca symbiosis can have a signifi cant ecological impact since it regularly forms extensive blooms, called "green" tides, where densities can reach up to 5 × 10 6 cells L −1 (Harrison et al 2011 ;Madhu et al 2012 ). N. scintillans can also remain strictly heterotrophic, feeding on a large variety of prey with its tentacle, and can reach bloom densities in temperate, tropical and polar waters (Elbrächter and Qi 1998 ).…”

Section: Dinofl Agellate Hostsmentioning

confidence: 99%

Photosymbiosis in Marine Planktonic Protists

2015

View full text Add to dashboard Cite

Some of the most enigmatic components in the plankton are the diverse eukaryotic protists that live in close association with one or more partners. Mutualistic and commensal planktonic interactions are most commonly encountered in the oligotrophic open ocean at tropical and subtropical latitudes. They are functionally and ecologically distinct, and involve a great taxonomic diversity of single-celled partners. Protists like Foraminifera, Radiolaria, dinofl agellates and diatoms can all harbor microalgal symbionts of eukaryotic and prokaryotic origin inside (endosymbiosis) and/or outside (ectosymbiosis) their cytoplasm. Such symbioses (photosymbioses) combine phototrophy, heterotrophy and sometimes dinitrogen (N 2 ) fi xation (reduction of N 2 to ammonium). Symbiotic microorganisms therefore represent an important component of marine ecosystems and play a role in the food web and biogeochemical cycling (e.g., carbon and nitrogen). Despite their important ecological function and early recognition in the late nineteenth century, our knowledge about the diversity, distribution, and metabolic exchanges for many of the photosymbioses remains rudimentary compared with the other marine and terrestrial symbioses. Recent technical advances in single-cell genomics and imaging have greatly improved our understanding about planktonic symbioses. This review aims to present and compare many eukaryote-eukaryote and eukaryote-prokaryote photosymbioses described so far in the open ocean with an emphasis on their ecology and potential function in the ecosystem.

show abstract

“…1d) and a colorless one lacking the symbiont. The green form produced large blooms (3 × 10 6 cells l -1 ) in the northern Arabian Sea during the 2000 spring intermonsoon bloom, covering a vast area between 17-21 degrees N and 66-70 degrees E (Madhu et al 2012), confirming earlier reports of similar blooms in the northeast Monsoon and the Spring Intermonsoon (Gomes et al 2008). The presence of the symbiont in these naturally occurring N. scintillans populations may contribute to their explosive growth, making the northeastern Arabian Sea highly productive (mean 607 ± 338 mg C m -2 d -1 ) even during oligotrophic periods such as the spring intermonsoon.…”

Section: Dinoflagellatesmentioning

confidence: 99%

Living Together in the Plankton: A Survey of Marine Protist Symbioses

Anderson

2014

Acta Protozool.

View full text Add to dashboard Cite

Our best evidence is that life arose in the marine environment, and over many millennia of evolutionary proliferation, punctuated by occasional massive extinctions, marine protists have developed remarkably elegant and sometimes complex relationships with prokaryotic and eukaryotic symbionts. Current evidence of the range of marine protist taxa possessing symbionts, including their diversity and physiological functional relationships, is reviewed within an ecological context. Some perspectives are presented on potential opportunities for new avenues of research in unraveling the remarkable adaptive value of two or more genetically diverse marine unicellular organisms living in a close structural and physiological relationship.

show abstract

Enhanced chlorophyllaand primary production in the northern Arabian Sea during the spring intermonsoon due to greenNoctilucascintillansbloom

Cited by 36 publications

References 12 publications

Physicochemical controls on the initiation of phytoplankton bloom during the winter monsoon in the Arabian Sea

Physicochemical controls on the initiation of phytoplankton bloom during the winter monsoon in the Arabian Sea

Photosymbiosis in Marine Planktonic Protists

Living Together in the Plankton: A Survey of Marine Protist Symbioses

Contact Info

Product

Resources

About