Brown,S.L.,Landry,M.R.,Christensen,S.,Garrison,D.,Gowing,M.M.,Bidigare,R.R.,Campbell,L.
Microbial community dynamics and taxon-specific phytoplankton production in the Arabian Sea during the 1995 monsoon seasons Journal Article
In: Deep-Sea Research Part II, vol. 49, no. 57, pp. 2345-2376, 2002.
Abstract | BibTeX | Tags: Arabian Sea, assessment, growth, population, prey, Upwelling
@article{,
title = {Microbial community dynamics and taxon-specific phytoplankton production in the Arabian Sea during the 1995 monsoon seasons},
author = {Brown,S.L.,Landry,M.R.,Christensen,S.,Garrison,D.,Gowing,M.M.,Bidigare,R.R.,Campbell,L.},
year = {2002},
date = {2002-01-01},
journal = {Deep-Sea Research Part II},
volume = {49},
number = {57},
pages = {2345-2376},
abstract = {As part of the US JGOFS Arabian Sea Process Study in 1995, we investigated temporal and spatial patterns in microbial dynamics and production during the late Southwest (SW) Monsoon (August-September 1995) and the early Northeast (NE) Monsoon (November-December 1995) seasons using the seawater-dilution technique. Experiments were coupled with population assessments from high-performance liquid chromatography, flow cytometry, and microscopy to estimate further taxon-specific phytoplankton growth, grazing and production. Dilution estimates of total primary production varied substantially, from 7 to 423 mg Cl-1 d-1, and were generally in good agreement with rate estimates from 14C-uptake incubations. Both primary production and secondary bacterial production were, on average, 2.5xhigher during the SW Monsoon than the NE Monsoon. Relative to the total community, photosynthetic prokaryotes contributed 23% and 53% of production during the SW and NE Monsoons, respectively. Prochlorococcus spp. production was well balanced by grazing losses, while >50% of Synechococcus spp. production during the SW Monsoon appeared to escape grazing by protists. Diatoms comprised >30% of primary production at a high biomass station during the SW Monsoon but <30% at all stations during the NE Monsoon. Growth rates of Synechococcus spp. and diatoms appeared to be limited by inorganic nitrogen concentrations, while Prochlorococcus spp., dinoflagellates and Phaeocystis spp. were not. Losses to protistan grazing were strongly correlated with phytoplankton biomass and production. Despite sufficient prey levels, protistan biomass was modest and constant across the region during both seasons. Of the larger taxa, diatoms were grazed the least effectively with only 50% of daily production accounted for by protistan grazing. Combined estimates of protistan and mesozooplankton grazing at upwelling stations during the SW Monsoon leave ~10% of primary production unaccounted for and available for sinking and/or lateral advection. Similarly high rates of net production at northern coastal stations during the NE Monsoon suggest that this area also may contribute to regional export flux},
keywords = {Arabian Sea, assessment, growth, population, prey, Upwelling},
pubstate = {published},
tppubtype = {article}
}
As part of the US JGOFS Arabian Sea Process Study in 1995, we investigated temporal and spatial patterns in microbial dynamics and production during the late Southwest (SW) Monsoon (August-September 1995) and the early Northeast (NE) Monsoon (November-December 1995) seasons using the seawater-dilution technique. Experiments were coupled with population assessments from high-performance liquid chromatography, flow cytometry, and microscopy to estimate further taxon-specific phytoplankton growth, grazing and production. Dilution estimates of total primary production varied substantially, from 7 to 423 mg Cl-1 d-1, and were generally in good agreement with rate estimates from 14C-uptake incubations. Both primary production and secondary bacterial production were, on average, 2.5xhigher during the SW Monsoon than the NE Monsoon. Relative to the total community, photosynthetic prokaryotes contributed 23% and 53% of production during the SW and NE Monsoons, respectively. Prochlorococcus spp. production was well balanced by grazing losses, while >50% of Synechococcus spp. production during the SW Monsoon appeared to escape grazing by protists. Diatoms comprised >30% of primary production at a high biomass station during the SW Monsoon but <30% at all stations during the NE Monsoon. Growth rates of Synechococcus spp. and diatoms appeared to be limited by inorganic nitrogen concentrations, while Prochlorococcus spp., dinoflagellates and Phaeocystis spp. were not. Losses to protistan grazing were strongly correlated with phytoplankton biomass and production. Despite sufficient prey levels, protistan biomass was modest and constant across the region during both seasons. Of the larger taxa, diatoms were grazed the least effectively with only 50% of daily production accounted for by protistan grazing. Combined estimates of protistan and mesozooplankton grazing at upwelling stations during the SW Monsoon leave ~10% of primary production unaccounted for and available for sinking and/or lateral advection. Similarly high rates of net production at northern coastal stations during the NE Monsoon suggest that this area also may contribute to regional export flux
Wilson,S.,Baldwin,R.M.
Environmental Impact Assessment for Seismic Surveying Block 41-Block 22, Offshore Oman Technical Report
no. 507, 2001.
Abstract | BibTeX | Tags: assessment, Gulf of Masirah, marine, monitoring, noise pollution, Oman, seismic surveys, survey
@techreport{,
title = {Environmental Impact Assessment for Seismic Surveying Block 41-Block 22, Offshore Oman},
author = {Wilson,S.,Baldwin,R.M.},
year = {2001},
date = {2001-01-01},
number = {507},
pages = {1-83},
abstract = {The report describes the scope of surveying work to be undertaken, and the general parameters of the marine environment that could be impacted. The potential environmental impacts to the seabed, water quality, air quality, wildlife and local communities are discussed, and recommendations for mitigation of these impacts are made. Recommendations re also made for environmental monitoring to take place during the survey.},
keywords = {assessment, Gulf of Masirah, marine, monitoring, noise pollution, Oman, seismic surveys, survey},
pubstate = {published},
tppubtype = {techreport}
}
The report describes the scope of surveying work to be undertaken, and the general parameters of the marine environment that could be impacted. The potential environmental impacts to the seabed, water quality, air quality, wildlife and local communities are discussed, and recommendations for mitigation of these impacts are made. Recommendations re also made for environmental monitoring to take place during the survey.
By Ministry of Regional Municipalities; Environment/Petroleum Development Oman LTD in association with Fisheries Extension & Technical Services,marine Science; Fisheries Centre; Sultan Qaboos University
Artificial reefs - Investigation of colonisation of tyre and concrete reefs in Omani coastal waters with particular regard to possible toxicity expression by tyres Technical Report
no. 341, 1997.
Abstract | BibTeX | Tags: artificial reefs, assessment, cadmium, development, Fisheries, marine, Oman, zinc
@techreport{,
title = {Artificial reefs - Investigation of colonisation of tyre and concrete reefs in Omani coastal waters with particular regard to possible toxicity expression by tyres },
author = {By Ministry of Regional Municipalities and Environment/Petroleum Development Oman LTD in association with Fisheries Extension & Technical Services,marine Science and Fisheries Centre and Sultan Qaboos University},
year = {1997},
date = {1997-01-01},
number = {341},
pages = {1-31},
abstract = {From Muscat to the Musandam in Oman , a distance of 200kms , the continental shelf is narrow , sandy and few hard features exist. This has resulted in the artisanal fishery being almost solely dependant on pelagic fish species for its catch (tuna, sardines and kingfish). On a number of occasions Batinah Coast fishery groups have requested that artificial reefs be installed with the intention of promoting pelagic fish aggregation and establishing a demersal fishery. Inshore currents along the Batinah coast run northwards from the substantial Muscat reef area and it is possible therefore that colonisation of any artificial reefs on the Batinah coast by reef organisms could be rapid To date permission for artificial reel' deployment has not been granted by the Ministry of Regional Municipality and Environment since waste materials only were to be used and in particular redundant tyres. Concern has been expressed that tyres could leach cadmium, zinc and Polyaromatic Hydrocarbons and affect the local marine environment. It has been established , however , that fishery groups on the Batinah Coast are already deploying tyres as artificial reefs. It is essential therefore that experimental assessment oh the effects of such deployments in Omani waters and the benefits or otherwise arc quickly established. Petroleum Development Oman over a number of years have built up a stockpile of some 20,000 old tyres which is growing at the rate of 2000 a year and suggested that rather than dump all the tyres they could be used for artificial reef building. They expressed a willingness to help in any pre-deployment research considered necessary to enable such a use for the tyres to be decided. IT IS TO BL EMPHASISED THAT THE MINISTRY OF REGIONAL MUNICIPALITIES AND ENVIRONMENT IS NOT ADVOCATING OR SUPPORTING THE DEPLOYMENT OF TYRE ARTIFICIAL REEFS ;THE MINISTRY ONLY WISHES TO ESTABLISH IF SUCH DEPLOYMENTS ARE ENVIRONMENTALLY SAFE OR NOT, AS THE CASE MAY BE.},
keywords = {artificial reefs, assessment, cadmium, development, Fisheries, marine, Oman, zinc},
pubstate = {published},
tppubtype = {techreport}
}
From Muscat to the Musandam in Oman , a distance of 200kms , the continental shelf is narrow , sandy and few hard features exist. This has resulted in the artisanal fishery being almost solely dependant on pelagic fish species for its catch (tuna, sardines and kingfish). On a number of occasions Batinah Coast fishery groups have requested that artificial reefs be installed with the intention of promoting pelagic fish aggregation and establishing a demersal fishery. Inshore currents along the Batinah coast run northwards from the substantial Muscat reef area and it is possible therefore that colonisation of any artificial reefs on the Batinah coast by reef organisms could be rapid To date permission for artificial reel' deployment has not been granted by the Ministry of Regional Municipality and Environment since waste materials only were to be used and in particular redundant tyres. Concern has been expressed that tyres could leach cadmium, zinc and Polyaromatic Hydrocarbons and affect the local marine environment. It has been established , however , that fishery groups on the Batinah Coast are already deploying tyres as artificial reefs. It is essential therefore that experimental assessment oh the effects of such deployments in Omani waters and the benefits or otherwise arc quickly established. Petroleum Development Oman over a number of years have built up a stockpile of some 20,000 old tyres which is growing at the rate of 2000 a year and suggested that rather than dump all the tyres they could be used for artificial reef building. They expressed a willingness to help in any pre-deployment research considered necessary to enable such a use for the tyres to be decided. IT IS TO BL EMPHASISED THAT THE MINISTRY OF REGIONAL MUNICIPALITIES AND ENVIRONMENT IS NOT ADVOCATING OR SUPPORTING THE DEPLOYMENT OF TYRE ARTIFICIAL REEFS ;THE MINISTRY ONLY WISHES TO ESTABLISH IF SUCH DEPLOYMENTS ARE ENVIRONMENTALLY SAFE OR NOT, AS THE CASE MAY BE.