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Physiological Tolerances of Some Antarctic Zooplanktons

Created 17/11/2025

Updated 17/11/2025

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Colonisation of Lake Fletcher, a hypersaline, meromictic lake in the Vestfold Hills, Antarctica, by the calanoid copepod Drepanopus bispinosus, the cyclopoid copepod Oncea curvata and an undescribed cydippid ctenophore is discussed. In 1978, salinity direstly under the ice was 66 ppt and repeated net hauls found no zooplankton. In 1983, adults of D. bispinosus were found, and in 1984, a reproductively active population of this species. Surface water salinity in 1984 was 56 ppt. During winter 1986, surface salinity was 54 ppt and three zooplankton species (D. bispinosus, O curvata and an undescribed cydippid ctenophore) had established populations in the lake. In 1986/87, high tides caused nearby Taynaya Bay to flood into the lake, and three further species (the calanoid, Paralabidocera antarctica, and two harpacticoids, Harpacticus furcatus and Idomene sp.) were found in the lake. It appears that periodic flooding after 1978 caused a salinity decrease in the lake from 66 to 54 ppt, and this enabled some invertebrate species to maintain year-round populations, whereas others require marine incursions to re-establish summer only populations. The fields in this dataset are: Date Salinity Record Species

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Additional Info

Field Value
Title Physiological Tolerances of Some Antarctic Zooplanktons
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/17bd4cb2-ac2c-4cb6-9edd-724cd33a0a2d
Contact Point
Australian Ocean Data Network
metadata@aad.gov.au
Reference Period 01/01/1978 - 20/02/1987
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    78.2569,
    -68.4516
  ],
  "type": "Point"
}
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "Physiological Tolerances of Some Antarctic Zooplanktons". Please visit the source to access the original metadata of the dataset:
https://data.gov.au/data/dataset/physiological-tolerances-of-some-antarctic-zooplanktons1