Bacterioplankton abundance and production in Indian Ocean regions

Ramaiah, N.; Fernandes, Veronica; Rodrigues, Veera; Paul, Jane T.; Gauns, Mangesh

doi:10.1029/2008gm000711

Cited by 10 publications

(8 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results show high PP in the equatorial Indian Ocean and low PP below this region, whereas Fernandes [2008] indicated that there does not exist a pronounced latitudinal difference in Chlorophyll a concentration as well as PP values in the Indian Ocean. Similarly, the bacterial abundances and production rates measured during Southwest Monsoon and Northeast Monsoon in the equatorial Indian Ocean were found to be lower than those in other regions of the Indian Ocean [Ramaiah et al, 2009]. Present study carried out during spring intermonsoon shows that in the Indian Ocean from equator to 25.38S, there is a decrease in PP by a factor of 3.…”

Section: Primary Production and 234 Th Fluxmentioning

confidence: 99%

“…At times of low autotrophic production, sizeable heterotrophic bacterial biomass and particulates served as source of food for microzooplankton and mesozooplankton. Heterotrophic bacterial productivity (using 3 H-thymidine) incorporation experiments conducted in the bay during spring intermonsoon showed increased bacterial production in the upper 200 m of water column [Ramaiah et al, 2009]. Maximum abundance of heterotrophic dinoflagellates and phaeosomes was also found in the Bay of Bengal during this season [Jyothibabu et al, 2006].…”

Section: Primary Production and 234 Th Fluxmentioning

confidence: 99%

See 1 more Smart Citation

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive ²³⁴Th

et al. 2017

View full text Add to dashboard Cite

The northern Indian Ocean is globally significant for its seasonally reversing winds, upwelled nutrients, high biological production, and expanding oxygen minimum zones. The region acts as sink and source for atmospheric CO2. However, the efficiency of the biological carbon pump to sequester atmospheric CO2 and export particulate organic carbon from the surface is not well known. To quantify the upper ocean carbon export flux and to estimate the efficiency of biological carbon pump in the Bay of Bengal and the Indian Ocean, seawater profiles of total 234Th were measured from surface to 300 m depth at 13 stations from 19.9°N to 25.3°S in a transect along 87°E, during spring intermonsoon period (March–April 2014). Results showed enhanced in situ primary production in the equatorial Indian Ocean and the central Bay of Bengal and varied from 13.2 to 173.8 mmol C m−2 d−1. POC export flux in this region varied from 0 to 7.7 mmol C m−2 d−1. Though high carbon export flux was found in the equatorial region, remineralization of organic carbon in the surface and subsurface waters considerably reduced organic carbon export in the Bay of Bengal. Annually recurring anticyclonic eddies enhanced organic carbon utilization and heterotrophy. Oxygen minimum zone developed due to stratification and poor ventilation was intensified by subsurface remineralization. 234Th‐based carbon export fluxes were not comparable with empirical statistical model estimates based on primary production and temperature. Region‐specific refinement of model parameters is required to accurately predict POC export fluxes.

show abstract

Section: Primary Production and 234 Th Fluxmentioning

confidence: 99%

Section: Primary Production and 234 Th Fluxmentioning

confidence: 99%

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive ²³⁴Th

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Distribution of LOD size-classes in the EQ zone exhibited the typical lognormal distribution for most natural assemblages. While phytoplankton biomass was lower during the inter-monsoon compared with monsoon seasons, bacterial production was highest in the Indian Ocean (Ramaiah et al 2009). High bacterial extracellular enzymatic activities (Caru so et al 2004) enabled a trophic difference in available resources (e.g.…”

Section: Mechanism Governing Community Diversitymentioning

confidence: 99%

Tintinnid community structure in the eastern equatorial Indian Ocean during the spring inter‑monsoon period

Zhang¹,

Sun²,

Wang³

et al. 2017

Aquat. Biol.

View full text Add to dashboard Cite

Tintinnid community structure was investigated by plankton net (20 µm) sampling in the water column (0−200 m) at 33 stations during the spring inter-monsoon (10 March to 9 April 2012) in the eastern equatorial Indian Ocean. A total of 126 species belonging to 32 genera were recorded. Tintinnid abundance and biomass in the range of 193−2983 ind. m −3 and 0.99−14.75 µg C m −3 were positively related to integrated chlorophyll a (chl a) concentration. Taxonomic and morphological diversity were not significantly related to integrated chl a concentration and size diversity, estimated by size-fractionated chl a concentration in the water column of 0−200 m, but were negatively correlated to the depth of the deep chlorophyll maximum. Species abundance distributions at most stations (31 of 33) and in the 3 zones -the northern zone of the equator, the southern zone of the equator (SEQ) and the equator (EQ) -followed a typical lognormal distribution. The geometric distribution gave the best fit for the distribution of lorica oral diameter sizeclasses in the NEQ and SEQ. Our results suggest that the community structure of tintinnids is governed by the underlying water column environment rather than by the neutral theory of random colonization from a large species pool.

show abstract

“…During spring inter monsoon, the water column remains warmer and highly stratified with nutrient deficient surface waters, whereas, wind driven coastal upwelling during southwest monsoon and convective 4 overturning of surface waters due to winter cooling in the northeast monsoon render the water column well mixed during both the monsoons (Prasanna Kumar and Prasad 1996;Gerson et al 2014). Several studies have reported seasonal variations in bacterial abundance and primary productivity associated with physical forcing in the Arabian Sea (Campbell et al 1998;Ramaiah et al 2009). High primary productivity during the southwest monsoon was found to be associated with high nutrient availability (Prasanna Kumar et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Seasonal variations in viral distribution, dynamics, and viral-mediated host mortality in the Arabian Sea

et al. 2021

View full text Add to dashboard Cite

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

show abstract

Bacterioplankton abundance and production in Indian Ocean regions

Cited by 10 publications

References 60 publications

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive ²³⁴Th

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive ²³⁴Th

Tintinnid community structure in the eastern equatorial Indian Ocean during the spring inter‑monsoon period

Seasonal variations in viral distribution, dynamics, and viral-mediated host mortality in the Arabian Sea

Contact Info

Product

Resources

About

Bacterioplankton abundance and production in Indian Ocean regions

Cited by 10 publications

References 60 publications

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive 234Th

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive 234Th

Tintinnid community structure in the eastern equatorial Indian Ocean during the spring inter‑monsoon period

Seasonal variations in viral distribution, dynamics, and viral-mediated host mortality in the Arabian Sea

Contact Info

Product

Resources

About

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive ²³⁴Th

Spatial variability of upper ocean POC export in the Bay of Bengal and the Indian Ocean determined using particle‐reactive ²³⁴Th