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Summary

Metadata record for data from ASAC Project 229
See the link below for public details on this project.

From the abstracts of some of the referenced papers:

In January 1985 a net sampling survey was carried out on the distribution and abundance of euphausiid larvae in the Prydz Bay region. Euphausia superba occurred in low abundance, probably due to ... sampling preceding the main spawning period. Thysanoessa macrura occurred throughout the study area in consistently high abundance. Euphausia crystallorophias as marginally more abundant within its restricted range. Distinct north-south variations in larval age and development stages of T. macrura were observed indicating regional differences in spawning. Euphausia frigida was mainly confined to the upper 200 m of the Antarctic Circumpolar Current. Larvae originating on the shelf moved rapidly west in the East Wind drift. E. crystallorophias had the same westward dispersion, but some larvae appeared to return eastward via the Prydz Bay Gyre and remain in the region. The data indicate that most E. superba larvae, providing they survive injurious cold temperature and food deprivation, will leave the area, suggests that Prydz Bay krill may not be a self sustaining stock.

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This paper presents results of net sampling carried out in four marine science cruises between 1981 and 1985, in the Prydz Bay region of Antarctica by the Australian Antarctic Division. Krill exhibited a patchy distribution and overall low abundance. The majority of sampling sites in January 1985 returned no post-larval krill or densities of less than 1 individual per 1000 cubic metres. The estimated mean abundance of E. superba in January 1985 was 6 indivduals or 2 g (wet wt.) per 1000 cubic metres integrated for the upper 200m of the water column which represented 3.4% of the total zooplankton biomass. No more than five years-groups, including the larvae, were observed in Prydz Bay, with mean lengths of groups 1+, 2+, 3+ and 4+ being 24, 38, 46 and 53 mm (standard 1), respectively in the middle of January. A high proportion of naupliar stages observed in January 1985 indicated that spawning in Prydz Bay begins in January and examination of adult maturation showed that the spawning continues at least to March.

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Sixty female Antarctic krill (Euphausia superba Dana) spawned in shipboard experiments and the interval between egg-laying and ecdysis was noted. The number of eggs laid per female ranged from 263-3662, most females produced only one batch of eggs before moulting, and the post spawn ovaries of all females contained few, if any, mature oocytes. As reported in other studies, the total number of eggs produced per female was not well correlated with body size. Females appeared to spawn at all times during the moulting cycle and although no diurnal rhythm in spawning was observed, moulting occurred mainly at night-time despite the animals being kept in near-constant darkness. No evidence of synchronous moulting was detected.

Geographic Coverage Spatial coordinates   

N: -67.0

S: -70.0

E: 78.0

W: 70.0

Temporal Coverage

Start Date: 1981-01-20 Stop Date: 1995-03-31

Location Keywords

CONTINENT > ANTARCTICA > Prydz Bay OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR

Science Keywords

BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > SPECIES LIFE HISTORY BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > POPULATION DYNAMICS BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > SURVIVAL RATES

ISO Topic Category

BIOTA OCEANS

Platform

SHIPS

Instrument

TRAWL

Quality

Values provided in temporal and spatial coverage are approximate only.

Access Constraints

PDF copies of some of the referenced papers are available for download from the URL given below.

Ancillary Keywords

Krill Distribution Abundance Spawning Moulting Euphausia superba Euphausia crystallorophias Thysanoessa macrura larvae

Data Set Progress

COMPLETE

Data Center

Australian Antarctic Data Centre, Australia Data Center URL: http://data.aad.gov.au Data Center Personnel Name: DATA OFFICER AADC Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: metadata at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia

Distribution

Distribution Media: HTTP Distribution Size: 13,608 kb Distribution Format: pdf Fees: free

Personnel

GRAHAM HOSIE Role: INVESTIGATOR Role: TECHNICAL CONTACT Phone: +61 3 6232 3364 Fax: +61 3 6232 3158 Email: graham.hosie at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia STEPHEN NICOL Role: INVESTIGATOR Role: TECHNICAL CONTACT Phone: +61 3 6232 3324 Fax: +61 3 6232 3351 Email: stephen.nicol at aad.gov.au Contact Address: 203 Channel Highway Australian Antarctic Division City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia DAVE CONNELL Role: DIF AUTHOR Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: dave.connell at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia

Related URL

Link: GET DATA Description: Download point for the data - papers Link: VIEW PROJECT HOME PAGE Description: Public information for ASAC project 229 Link: VIEW RELATED INFORMATION Description: Citation reference for this metadata record and dataset

Publications/References

Nicol S., Stolp M., Hosie G.W. (1991) Accumulation of fluorescent age pigments in a laboratory population of Antarctic krill Euphausia superba Dana. Journal of Experimental Marine Biology and Ecology 146. 153-161

Hosie G.W. (1991) Distribution and abundance of euphausiid larvae in the Prydz Bay region, Antarctica. Antarctic Science 3(2). 167-180

Hosie G.W., ... Cochran T.G. (1994) Mesoscale distribution patterns of macrozooplankton communities in Prydz Bay, Antarctica - January to February 1991. Marine Ecology Progress Series 106. 21-39

Hosie G.W. (1994) The macrozooplankton communities in the Prydz Bay region, Antarctica. El-Sayed S.Z. Southern Ocean Ecology. The BIOMASS Perspective 93-123

Hosie G.W. (1994) Multivariate analyses of the macrozooplankton community and euphausiid larval ecology in the Prydz Bay region, Antarctica. ANARE Reports 137. 209 pp.

Higginbottom I., Hosie G.W. (1989) A super swarm of krill in Prydz Bay, Antarctica. Marine Ecology Progress Series 58. 197-203

Nicol S., Stolp M., Hosie G.W. (1991) Age structure of Antarctic krill (Euphausia superba) populations as determined by age-pigment analysis and by size-frequency analysis. Memoirs of the Queensland Museum 31. 394

Hosie G.W., Ikeda T., Stolp M. (1988) Distribution, abundance and population structure of the Antarctic krill (Euphausia superba Dana) in the Prydz Bay region, Antarctica. Polar Biology 8. 213-224

Nicol S. (1989) Apparent independence of the spawning and moulting cycles in female Antarctic krill (Euphausia superba Dana). Polar Biology 9. 371-375

Nicol S. (1989) Who's counting on krill? New Scientist 1690. 20-23

Hosie G.W., Stolp M. (1989) Krill and zooplankton in the western Prydz Bay region, September-November 1985. Proceedings of the NIPR Symposium on Polar Biology 2. 34-45

Hosie G.W., Kirkwood J.M. (1986) Euphausiid larvae collected from the Prydz Bay region during the Nella Dan cruise (SIBEX I). Memoirs of National Institute of Polar Research Special Issue 40. 110-116

Chiba S., Ishimaru T., Hosie G.W., Fukuchi M. (2002) Spatio-temporal variability in life cycle strategy of four pelagic Antarctic copepods: Rhincalanus gigas, Calanoides acutus, Calanus propinquus and Metridia gerlachei. Polar Biosciences 15. 27-44

Ikeda T., Hosie G., Stolp M. (1986) SIBEX II cruise krill/zooplankton sampling data. ANARE Research Notes 32. 70 pp.

Hosie G.W., Ikeda T., Stolp M., Williams R. (1987) ADBEX III cruise krill/zooplankton sampling data. ANARE Research Notes 57. 34 pp.

Hosie G.W., Kitchener J., Stolp M., Cochran T.G., Williams R. (1991) AAMBER 86/87 cruise krill/zooplankton sampling data. ANARE Research Notes 79. 54 pp.

Hosie G.W. (1992) Multivariate Analyses of the Macrozooplankton Community and Euphausiid Larval Ecology in the Prydz Bay Region, Antarctica.

Creation and Review Dates

DIF Creation Date: 2000-07-20 Last DIF Revision Date: 2008-04-10

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