Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean
A detailed hydrographic and biological survey was conducted in the region of the Subtropical Convergence in the Indian sector of the Southern Ocean in April 2007. Hydrographic data revealed that the subsurface expression of the Subtropical Convergence (at 200 m), marked by the 10°C isotherm, appeare...
Main Authors: | , , , , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2007
|
Subjects: | |
Online Access: | http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:6966 http://hdl.handle.net/10962/d1012030 |
id |
ftsealsdc:vital:6966 |
---|---|
record_format |
openpolar |
spelling |
ftsealsdc:vital:6966 2024-09-30T14:44:06+00:00 Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean Froneman, P William Ansorge, Isabelle J Richoux, Nicole B Blake, Justin Daly, Ryan Sterley, Jessica A Mostert, Bruce P Heyns, Elodie R Sheppard, Jill N Kuyper, B Hart, N George, C Howard, J Mustafa, E Pey, F Lutjeharms, Johan R E 2007 3 pages pdf http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:6966 http://hdl.handle.net/10962/d1012030 English eng vital:6966 http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:6966 http://hdl.handle.net/10962/d1012030 Article 2007 ftsealsdc 2024-09-02T23:48:10Z A detailed hydrographic and biological survey was conducted in the region of the Subtropical Convergence in the Indian sector of the Southern Ocean in April 2007. Hydrographic data revealed that the subsurface expression of the Subtropical Convergence (at 200 m), marked by the 10°C isotherm, appeared to meander considerably between 41°S and 42°15’S. Total surface chlorophyll- a concentration was low and ranged from 0.03 to 0.42 µg l–1 and was always dominated by the pico- (<2 µm) and nano- (2–120 µm) size classes, which contributed between 81% and 93% of the total pigment. The total chlorophyll-a integrated over the top 150m of the water column showed no distinct spatial trends, and ranged from 12.8 to 40.1mg chl-a m–2. There were no significant correlations between the total integrated chlorophyll- a concentration and temperature and salinity (P > 0.05). The zooplankton community was dominated, numerically and by biomass, by mesozooplankton comprising mainly copepods of the genera, Oithona,Paraeuchaeta, Pleuromamma, Calanus and Clausocalanus. An exception was recorded at those stations in the region of the front where the tunicate, Salpa thompsoni, dominated the total zooplankton biomass. Article in Journal/Newspaper Southern Ocean Copepods SEALS Digital Commons (South East Academic Libraries System, South Africa) Southern Ocean Indian |
institution |
Open Polar |
collection |
SEALS Digital Commons (South East Academic Libraries System, South Africa) |
op_collection_id |
ftsealsdc |
language |
English |
description |
A detailed hydrographic and biological survey was conducted in the region of the Subtropical Convergence in the Indian sector of the Southern Ocean in April 2007. Hydrographic data revealed that the subsurface expression of the Subtropical Convergence (at 200 m), marked by the 10°C isotherm, appeared to meander considerably between 41°S and 42°15’S. Total surface chlorophyll- a concentration was low and ranged from 0.03 to 0.42 µg l–1 and was always dominated by the pico- (<2 µm) and nano- (2–120 µm) size classes, which contributed between 81% and 93% of the total pigment. The total chlorophyll-a integrated over the top 150m of the water column showed no distinct spatial trends, and ranged from 12.8 to 40.1mg chl-a m–2. There were no significant correlations between the total integrated chlorophyll- a concentration and temperature and salinity (P > 0.05). The zooplankton community was dominated, numerically and by biomass, by mesozooplankton comprising mainly copepods of the genera, Oithona,Paraeuchaeta, Pleuromamma, Calanus and Clausocalanus. An exception was recorded at those stations in the region of the front where the tunicate, Salpa thompsoni, dominated the total zooplankton biomass. |
format |
Article in Journal/Newspaper |
author |
Froneman, P William Ansorge, Isabelle J Richoux, Nicole B Blake, Justin Daly, Ryan Sterley, Jessica A Mostert, Bruce P Heyns, Elodie R Sheppard, Jill N Kuyper, B Hart, N George, C Howard, J Mustafa, E Pey, F Lutjeharms, Johan R E |
spellingShingle |
Froneman, P William Ansorge, Isabelle J Richoux, Nicole B Blake, Justin Daly, Ryan Sterley, Jessica A Mostert, Bruce P Heyns, Elodie R Sheppard, Jill N Kuyper, B Hart, N George, C Howard, J Mustafa, E Pey, F Lutjeharms, Johan R E Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean |
author_facet |
Froneman, P William Ansorge, Isabelle J Richoux, Nicole B Blake, Justin Daly, Ryan Sterley, Jessica A Mostert, Bruce P Heyns, Elodie R Sheppard, Jill N Kuyper, B Hart, N George, C Howard, J Mustafa, E Pey, F Lutjeharms, Johan R E |
author_sort |
Froneman, P William |
title |
Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean |
title_short |
Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean |
title_full |
Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean |
title_fullStr |
Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean |
title_full_unstemmed |
Physical and biological processes at the Subtropical Convergence in the South-west Indian Ocean |
title_sort |
physical and biological processes at the subtropical convergence in the south-west indian ocean |
publishDate |
2007 |
url |
http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:6966 http://hdl.handle.net/10962/d1012030 |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Southern Ocean Copepods |
genre_facet |
Southern Ocean Copepods |
op_relation |
vital:6966 http://vital.seals.ac.za:8080/vital/access/manager/Repository/vital:6966 http://hdl.handle.net/10962/d1012030 |
_version_ |
1811645594913996800 |