Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown

Rodhouse, P. G.; Piatkowski, Uwe

doi:10.1007/bf00349152

Cited by 23 publications

(10 citation statements)

References 17 publications

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“…They were not caught during the present study but have been. sampled by nets in earlier studies in the PFZ (Rodhouse 1991, Rodhouse & Piatkowski 1995. However, the most frequent squid in the net samples, Brachioteuthls ?picta, I S entirely absent from the albatrosses' diets.…”

Section: Discussionmentioning

confidence: 90%

Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions

Rodhouse¹,

Prince²,

Trathan³

et al. 1996

Mar. Ecol. Prog. Ser.

101

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Predator data and exploratory fishing in the Scotia Sea have revealed the presence of cephalopod stocks in the Antarctic Polar Frontal Zone (PFZ). This is a vast, remote region where large epipelagic cephalopods aggregate into highly mobde schools making them difficult to locate and sample. We used satellite tagged predators and shipboard acoustics for coarse and fine scale location of cephalopod concentrations, and sampled them with commercial and scientific nets to determine the relationship between cephalopod distribution and mesoscale oceanographic features at the PFZ. Satellite tags were attached to 9 grey-headed albatrosses Diomedea chrysostoma, breeding at Bird Island, South Georgia, to monitor foraging at sea in January-March 1994. A foraging area at the PFZ, north of South Georgia, was located, an acoustic survey undertaken and a fixed station established where acoustic targets were found. A net survey was carried out with a commercial pelagic trawl, a rectangular midwater trawl 25 mZ (RMT25), a horizontal multiple plankton sampler and a neuston net. Acoustic layers were targeted and the RMT25 sampled 200 m layers to 1000 m in daylight and darkness. Cephalopods were sinlultaneously recovered from food samples fed to D chrysostoma chicks at Bird Island. Two CTD transects, approximately normal to the major current flow, were undertaken across the PFZ and remote-sensed sea-surface temperature images from NOAA polar orbiting satellites were obtained aboard ship. The pelagic trawl sampled a cephalopod community that closely resembled that exploited by D. chrysostorna. The largest and most conspicuous species was the ommastrephid squid Martialia hyadesi which is the most important cephalopod prey species. Net-sampled M. hyadesi had been feeding on crustaceans and mesopelagic fish. The cephalopod community was sampled in a feature, interpreted as a warm core ring, in an area characterised by mesoscale features associated with the bathymetry of the northern end of the Northeast Georgia Rise and near a gap in the Falkland Ridge. The association of these mesoscale features with the bathyrnetry suggests that they may be predictable foraging locations for the cephalopods and their predators.

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Section: Discussionmentioning

confidence: 90%

Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions

Rodhouse¹,

Prince²,

Trathan³

et al. 1996

Mar. Ecol. Prog. Ser.

101

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“…The species with circumpolar distributions in the Antarctic are: C. glacialis, M. hamiltoni, P. glacialis, A. antarcticus (Rodhouse & Piatkowski 1995), K. longimana (Roper et al 1985), M. psychrophila (Rodhouse 1990) and M. knipovitchi (Nemoto et al 1988).…”

Section: Discussionmentioning

confidence: 99%

A Geographical Information System (GIS) Atlas of cephalopod distribution in the Southern Ocean

et al. 1999

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“…To our knowledge, no research cruise has beenspecifically devoted to targeting cephalopods in waters surrounding subantarctic archipelagoes (but see Rodhouse et al 1992 andPiatkowski 1995 for cephalopod paralarvae and juveniles occurring in the vicinity of the Falkland Islands and South Georgia, respectively). In the southern Indian Ocean, only 1 preliminary study based on specimens opportunistically collected listed a total of 11 species of cephalopods (5 squid, 1 sepiolid and 5 octopuses) caught in the vicinity of Prince Edwards, Crozet, Kerguelen and Heard Islands (Lu & Mangold 1978).…”

Section: Introductionmentioning

confidence: 99%

Cephalopod fauna of subantarctic islands: new information from predators

Cherel¹,

Duhamel

Gasco

2004

Mar. Ecol. Prog. Ser.

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Using top predators as biological samplers, we collected information on the poorly known -but ecologically important -cephalopod fauna of the Southern Ocean. A total of 4527 cephalopod beaks were identified from stomach contents of Patagonian toothfish caught in slope waters at Crozet and Kerguelen Islands (Indian Ocean). Main prey were the squid Gonatus antarcticus and Kondakovia longimana at both localities, Taonius sp. B (Voss) and Slosarczykovia circumantarctica at Crozet, and Chiroteuthis veranyi and Mastigoteuthis psychrophila at Kerguelen. Fish diet together with the feeding habits of sharks and seabirds show that at least 36 and 38 different cephalopod species inhabit Crozet and Kerguelen waters, respectively. Oegopsid squid dominate the assemblages (29 and 32 taxa at Crozet and Kerguelen, respectively) over octopods (7 and 5 taxa), 1 species of sepiolid occurring at Kerguelen. These rich communities include pelagic squid, benthopelagic cirrate octopods and a few endemic benthic octopodids. The results emphasize the importance of onychoteuthids and gonatids in the nutrition of top consumers in the Southern Ocean and they shed new light on the role of chiroteuthids, mastigoteuthids and cirrate octopods in the trophic web of the marine ecosystems.KEY WORDS: Crozet · Kerguelen · Octopus · Patagonian toothfish · Slope · Southern Ocean · Squid Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 266: [143][144][145][146][147][148][149][150][151][152][153][154][155][156] 2004 collected listed a total of 11 species of cephalopods (5 squid, 1 sepiolid and 5 octopuses) caught in the vicinity of Prince Edwards, Crozet, Kerguelen and Heard Islands (Lu & Mangold 1978). Other information is sparse and adds only a few species in the area (Nesis 1987, Piatkowski et al. 1991, Duhamel & Piatkowski 1993, Piatkowski 1993, Xavier et al. 1999. The paucity of cephalopods collected by oceanographic cruises contrasts with their importance in the diet of top predators there, namely toothed whales (Mikhalev et al. 1981, seals (Slip 1995) and seabirds, including penguins, albatrosses and petrels (Ridoux 1994, 2002d. At Crozet and Kerguelen Islands, it has been estimated that the communities of breeding seabirds and seals consume more than 400 000 tons of cephalopods, mainly squid, each year (Guinet et al 1996).Our main goal was to collect information on the cephalopod communities inhabiting waters surrounding Crozet and Kerguelen archipelagoes by using top consumers as biological samplers. The study focused on the cephalopod diet of the Patagonian toothfish Dissostichus eleginoides, a species with subadults and adults living mainly in slope waters in the 400 to 1500 m depth range (Duhamel 1992). Patagonian toothfish is potentially an efficient biological sampler because first it is a large opportunistic predator feeding on a wide range of taxa (Garcia de la Rosa et al. 1997, Pilling et al. 2001, Goldsworthy et al. 2002. Second, subadults and adults are mainly resident , thus ...

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Fine-scale distribution of juvenile cephalopods in the Scotia Sea and adaptive allometry of the brachial crown

Cited by 23 publications

References 17 publications

Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions

Cephalopods and mesoscale oceanography at the Antarctic Polar Front:satellite tracked predators locate pelagic trophic interactions

A Geographical Information System (GIS) Atlas of cephalopod distribution in the Southern Ocean

Cephalopod fauna of subantarctic islands: new information from predators

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