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  • 1
    Electronic Resource
    Electronic Resource
    Krill aggregation characteristics: Spatial distribution patterns from hydroacoustic observations (1989)
    Springer
    Polar biology 10 (1989), S. 125-134 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The distributional features and physical characteristics of some 1500 krill (Euphausia superba Dana) aggregations detected and sized acoustically in the south-west Indian Ocean are described. The aggregations were on average considerably smaller than elsewhere in the Antarctic. Aggregation biomass was log-normally distributed with a mean of 0.18 t. Only 3% of the aggregations were heavier than 1 t. The aggregations were on average 4.2 km apart along-track, and on 10 of the 15 survey days were randomly distributed, judged by a Chisquare test based on expected Poisson statistics. The distribution of aggregations heavier than 1 t, and of aggregations 20 km on either side of such aggregations was similarly judged to be random. These observations suggest widespread randomness throughout the survey area, which is consistent with the absence of pronounced hydrographic or topographic concentrating mechanisms in the region. On the 5 non-random days, aggregations were smaller than average and were clustered on a scale of 1 km, suggesting that they could have been in the process of fragmenting or amalgamating. Estimates of the mean nearest-neighbour distance were derived for the random distributions. It is suggested that these could be useful in the development of fisheries-dependent indices of krill abundance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239157
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synopsis of “The biology and ecology of the Antarctic krill, Euphausia superba Dana” (1990)
    Springer
    Polar biology 10 (1990), S. 485-487 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The review summarises current knowledge on the ecology, biology and life history of the Antarctic krill (Euphausia superba Dana). This paper presents a synopsis of the contents and major conclusions of that review. Emphasis is placed on recent developments, particularly on the results of various national and international research programmes loosely co-ordinated under the auspices of BIOMASS (Biological Investigations of Marine Antarctic Systems and Stocks). Attention is focused on topics which are either directly or indirectly applicable to the effective management of krill exploitation within the provisions set out by the Convention for the Conservation of Antarctic Marine Living Resources (CCAMLR).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233695
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Krill biomass in the Atlantic (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 201-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Acoustic target strength (TS)1 is an important parameter when using acoustic survey data to estimate the abundance of Antarctic krill (Euphausia superba Dana). Recently, when the TS of krill was reassessed2,3, it emerged that the previous values had been too high, leading to unrealistically ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373201b0
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  • 4
    Electronic Resource
    Electronic Resource
    Variation in body length measurement of Euphausia superba Dana (1983)
    Springer
    Polar biology 2 (1983), S. 17-20 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Various body length measurements were made on freshly captured and preserved Euphausia superba Dana. Functions were calculated to describe the relationship of various length measurements to one another for fresh animals. In sexually immature animals length measurements were closely related, but variations in the relationship of standard length to carapace length were found for both mature male and female animals. This was attributed to variations in carapace length resulting from the presence of ripe ovaries in mature females and differences in growth rates of mature males. Comparison between fresh and preserved animals only showed variation in the relationship of standard length to uropod length indicating absence of preservative-induced shrinkage in the latter. Close agreement was found between the present results and those of other workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258280
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  • 5
    Electronic Resource
    Electronic Resource
    Antarctic krill aggregation characteristics from acoustic observations in the Southwest Atlantic Ocean (1993)
    Springer
    Marine biology 117 (1993), S. 171-183 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distributional features and physical characteristics of 4830 krill (Euphausia superba Dana) aggregations detected acoustically in the Southwest Atlantic between 26 January and 21 February 1981 are described. Results are compared with aggregations detected in the Indian Ocean. Aggregations in the Atlantic were larger, closer to the surface and to each other than in the Indian Ocean. Similar patterns in the distribution of aggregation spacing along survey transects were found in the two areas, although the pattern of spacings in the Atlantic indicates differences in the scale of aggregation. Serial interdependence of aggregation variables was minimal in the Atlantic, with aggregation thickness, length and spacing showing weak inter-relationships. Weak functional association, between water depth and aggregation thickness was evident. Investigation of variability in aggregation structure in relation to prevailing environmental conditions gave equivocal results and no clear association between any aggregation variable and prevailing hydrography was observed. The implications of these results for future studies on krill aggregation are discussed in relation to a conceptual framework which was developed from the present results and aimed at linking krill aggregation characteristics to environmental features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346440
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    Paper (German National Licenses)
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