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  • 1
    Electronic Resource
    Electronic Resource
    The structure of plankton communities of the Indian Ocean (1971)
    Springer
    Marine biology 9 (1971), S. 281-289 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Species diversity and trophic structure of plankton communities have been considered as most important biological features. The Fisher (α) and Simpson (λ) indices and the information index H=-Σ pi log2 pi (Margalef) were used for evaluation of species diversity. The indices have been calculated within the group of filter feeders by numbers (α and H′) and biomass (λ and H″) of the species; the best results were obtained in the latter case. The index H=-Σ pi log2 pi is proposed for the quantitative evaluation of trophic structure, where a portion of an individual trophic group is taken as pi. The plankton material was collected by the R.V. “Vityaz” in the northern Indian Ocean in January through February, 1960. Analysis of characteristics of zooplankton distribution, species and trophic diversity in connection with characteristics of the water regime resulted in the definition of 3 types of the plankton communities: (a) those in intensive divergence zones; (b) those in poor divergence zones; (c) those in regions with stable water stratification or with feebly marked convergence, distiguished by different values of biomass, species diversity, and trophic group ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372822
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diapause in the life cycle of Calanoides carinatus (Kroyer), (Copepoda, Calanoida) (1996)
    Springer
    Hydrobiologia 320 (1996), S. 197-208 
    Details
    ISSN: 1573-5117
    Keywords: Calanoides carinatus ; diapause ; biochemical composition ; respiration ; gonad development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and stage composition of Calanoidescarinatus (Kroyer) are described together with changes in protein and lipid content, respiration rate and gonad development in copepodite stages IV and V (CV) and adults in the Northern Benguela current (17°S, 23°S and 25°S). During active upwelling the population consisted of two parts: the surface part over the shelf was represented by all development stages, while the deep part offshore was dominated (90–95%) by diapausal CVs. In the surface CVs the surplus assimilated energy was allocated to structural growth and maturation or to synthesis of reserve lipids. CVs with large oil sacs and high lipid content descended into deeper layers and formed diapausal stock; they were characterized by a dramatic decrease of respiration rate. Increase of gonad size in association with decrease of oil sac volume in diapausal CV suggests that reserve lipids were expended not only for respiration but also for gonad development. The moulting of dispausal CVs into adults took place in deep water. These results are discussed in relation to the life cycle of the C. carinatus population and the factors causing the formation and termination of the diapausal phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016821
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    Paper (German National Licenses)
    Fulltext
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