Physical oceanography in the Scotia Sea during the CCAMLR 2000 survey, austral summer 2000

Brandon, Mark A.; Naganobu, Mikio; Demer, David A.; Chernyshkov, Pavel P.; Trathan, P. N.; Thorpe, Sally; Kameda, Takahiko; Berezhinskiy, Oleg A.; Hawker, Elizabeth J.; Grant, Sharon

doi:10.1016/j.dsr2.2004.06.006

Cited by 38 publications

(26 citation statements)

References 46 publications

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“…In the presence of this meander, the SAF and PF meet at 58°W before separating downstream. It is interesting to note that the joining of the SAF and PF at 58°W and 58°S was observed during one hydrographic section along WOCE SR1 [ Brandon et al , 2004]. Downstream, the SAF continues northward as the PF meanders around the OSD (Figure 17b).…”

Section: Float Period In An Altimetric Perspectivementioning

confidence: 95%

“…Most information about the Ona Basin circulation comes from the WOCE SR1 repeat sections, which were performed either in summer or late spring (Figure 1). These sections always encountered one to three deep eddies in the Ona Basin [ Cunningham et al , 2003; Brandon et al , 2004]. Cunningham et al [2003] found that these eddies have weak vertical velocity shears and large bottom velocities, increasing the recirculation transport to values as large as + or −25 Sv.…”

Section: Introductionmentioning

confidence: 99%

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Circulation in the Ona Basin, southern Drake Passage

et al. 2008

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International audienceFive Argo floats trapped in the Ona Basin, in the southern Drake Passage, provided unprecedented information on the water masses and the circulation present in all the seasons from March 2002 to April 2006. Their profiles recorded evidence of deep-penetrating eddies, interleaving of water masses, and branching of the Southern Front of the Antarctic Circumpolar Current as it meets the Shackleton Fracture Zone. Ten-day mean-velocity estimates at the float parking depth (2000 db) often exceeded 15 cm s^-1, revealing the intensity of the mesoscale field. Satellite data showed that the trapping period of the floats corresponded to the presence of an anticyclonic meander of the polar front over a depression in the topography to the northwest of the Ona Basin. The presence of this meander seems to be linked to low-frequency modes of variability in sea surface height in the Yaghan Basin

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Section: Float Period In An Altimetric Perspectivementioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Circulation in the Ona Basin, southern Drake Passage

et al. 2008

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“…2000 m depth (Schodlok et al. , 2002; Brandon et al. , 2004)] and that Chaenocephalus aceratus adults are benthic and display sedentary behaviour (Jones et al.…”

Section: Discussionmentioning

confidence: 99%

Population genetic structure and gene flow patterns between populations of the Antarctic icefish Chionodraco rastrospinosus

Papetti

Pujolar

Mezzavilla

et al. 2012

Journal of Biogeography

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Aim A lack of genetic structure is predicted for Antarctic fish due to the duration of pelagic larval stages and the strength of the currents in the Southern Ocean, particularly the Antarctic Circumpolar Current. In this study we explored the population structure of the ocellated icefish, Chionodraco rastrospinosus, by means of analysing a total of 394 individuals collected at four geographical areas off the Antarctic Peninsula in the period 1996–2006. Location Elephant Island, southern South Shetlands, Joinville Island and South Orkneys in the Southern Ocean. Methods The spatio-temporal genetic structure of Chionodraco rastrospinosus was explored using seven microsatellite loci. Existence and direction of gene flow across sampling locations were investigated using the isolation-by-migration procedure. Results Microsatellite data showed a lack of genetic structuring in the area studied, with no differences found at both the geographical or temporal level, and an eastward unidirectional gene flow among sites. This suggested a lack of genetic barriers for this species, attributable to larval dispersal following the Antarctic Circumpolar Current, which fits well with the predicted pattern for Antarctic fish. Re-examination of genetic data of the closely related icefish Chaenocephalus aceratus, with similar larval duration but displaying genetically structured populations, indicated a weak but significant bidirectional gene flow. Main conclusions Our results point to a relationship that is more complex than expected between potential for dispersal and realized gene flow in the marine environment. In addition to ocean circulation and larval dispersal, other major life-history traits might be driving connectivity, particularly larval retention

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“…Variability in recruitment may be related to oceanographic conditions, which may determine the retention of larvae over the Shag Rocks shelf. Brandon et al (2004) did identify a gyre over the Shag Rocks shelf, but it is not known how persistent it is.…”

Section: Discussionmentioning

confidence: 99%

“…The Shag Rocks shelf lies c. 161 km to the north‐west of South Georgia, occupying an area of c. 5000 km 2 , and separated from the South Georgia shelf by a deep channel. Shag Rocks are south of the mean position of the Antarctic Polar Front (APF) within the Antarctic Circumpolar Current (ACC), although there is evidence of a cyclonic circulation around the shelf (Brandon et al , 2004).…”

Section: Introductionmentioning

confidence: 99%

Distribution, growth, diet and foraging behaviour of the yellow‐fin notothen Patagonotothen guntheri (Norman) on the Shag Rocks shelf (Southern Ocean)

Collins

Shreeve

Fielding

et al. 2008

Journal of Fish Biology

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The distribution, total length (L T ) frequency and diet of Patagonotothen guntheri are described from 14 bottom trawl surveys conducted on the Shag Rocks and South Georgia shelves in the austral summers from 1986 to 2006. Patagonotothen guntheri (80-265 mm L T ) were caught on the Shag Rocks shelf from depths of 111 to 470 m, but no specimens were caught on the South Georgia shelf. Multiple cohorts were present during each survey and L T -frequency analysis of these cohorts suggests that growth was slow (von Bertalanffy K ¼ 0Á133). Evidence from stomach contents and acoustic data (2005 and 2006) showed that P. guntheri is primarily a pelagic feeder, migrating from the sea floor towards the surface to feed during daylight. The diet of smaller fish (<140 mm) was dominated by copepods, predominantly Rhincalanus gigas, whilst larger fish principally consumed the pelagic hyperiid amphipod, Themisto gaudichaudii and Antarctic krill Euphausia superba. Some larger fish also took benthic prey.

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Physical oceanography in the Scotia Sea during the CCAMLR 2000 survey, austral summer 2000

Cited by 38 publications

References 46 publications

Circulation in the Ona Basin, southern Drake Passage

Circulation in the Ona Basin, southern Drake Passage

Population genetic structure and gene flow patterns between populations of the Antarctic icefish Chionodraco rastrospinosus

Distribution, growth, diet and foraging behaviour of the yellow‐fin notothen Patagonotothen guntheri (Norman) on the Shag Rocks shelf (Southern Ocean)

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