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  • 1
    Electronic Resource
    Electronic Resource
    Antarctic benthic diversity (1994)
    [s.l.] : Nature Publishing Group
    Nature 368 (1994), S. 297-297 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR — Poore and Wilson1, and Rex et al.2, give evidence for a distinct decline in species diversity in deep-sea communities from the tropics towards north polar re-gions; and for a less clear trend but high interregional variability in the Southern Hemisphere. Poore and Wilson1 included some ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/368297a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Oocyte development and gonad production of Nematocarcinus lanceopes (Decapoda: Caridea) in the eastern Weddell Sea, Antarctica (1997)
    Springer
    Polar biology 17 (1997), S. 191-198 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Nematocarcinus lanceopes Bate 1888 is the only decapod that occurs in large numbers on the continental slope of the Weddell Sea, Antarctica. Histological examination of the female gonads and analyses of oocyte growth indicate a biannual reproduction cycle with seasonal occyte maturation in this species. Vitellogenic development is estimated to take 2 years and culminates during summer. Females spawn three times, every 2nd year, while they grow from 27 to 34 mm carapace length. Based on these results the calculated female gonad production is 184 g wet mass (70.5 g dry mass)/total catch, which is high compared to shrimp populations on the continental shelf of the Weddell Sea. Seasonal reproductive patterns of N. lanceopes seem to reflect oscillating food conditions in the Antarctic Weddell Sea. This mode of reproduction differs from all other Nematocarcinidae, which release eggs the whole year round. The ability to adapt the reproductive cycle to a seasonal productivity pattern may have been an important factor in extending the distribution range of the deep-water genus Nematocarcinus into Antarctic waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050122
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  • 3
    Electronic Resource
    Electronic Resource
    Gonopore development and sex change in the Antarctic shrimp Chorismus antarcticus (Caridea: Hippolytidae) (1997)
    Springer
    Polar biology 17 (1997), S. 384-388 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chorismus antarcticus is the only protandrous hermaphrodite decapod species found on the Antarctic continental shelves. The morphological structures of the male and female gonopores were described and used to determine sex and to fix the size range at which the transition from male to female takes place. The parallel occurrence of male and female gonopores was found in all specimens. The presence of open gonopore flaps at both the third and fifth pair of pereiopods in individuals between 9 and 12 mm of carapace length (CL) is discussed as the morphological indicator of sex change. Few females occurred from 9 mm CL onwards, whereas all shrimps larger than 13 mm CL only had open female gonopores. This size corresponds exactly with the CL at which onset of oocyte development and female gonad production starts. Secondary sexual characters, the gonopore structures, seem to allow an accurate prediction of the size range at which hermaphrodite caridean decapods change sex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013380
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