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  • 1
    Electronic Resource
    Electronic Resource
    Seasonal growth of the giant kelp Macrocystis pyrifera in New Zealand (1997)
    Springer
    Marine biology 129 (1997), S. 417-424 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal growth pattern of Macrocystis pyrifera (L.) C. Agardh in New Zealand was determined from measurements of blade-elongation rates between March 1986 and December 1987. Growth rates remained relatively constant throughout most of the year, but declined significantly during the summer months. Seawater nitrate levels had a marked seasonal cycle, with concentrations of 0.3 μM detected in summer. The timing of the decline in internal nitrogen concentrations varied for different-aged blades, but occurred ∼1 mo after the decrease in seawater nitrate concentrations. Sufficiently high irradiance levels and seawater nutrient concentrations support active growth for most of the year, but growth is nutrient-limited during summer. No carbon accumulation during summer was observed. Between March and August 1988, growth estimates were also derived from node-initiation rates and stipe-elongation rates to permit comparisons with previous studies from the northern and southern hemispheres. Direct comparisons of the three growth parameters determined for non-terminated canopy and sub-surface fronds were used to assess possible differential resource allocation in the two frond classes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050182
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Efferent Innervation of Mammalian Muscle-spindles (1961)
    [s.l.] : Nature Publishing Group
    Nature 190 (1961), S. 461-462 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These observations were made during the course of work supported by research grant J5-1806 from the National Institute of Neurological Diseases and Blindness, U.S. Public Health ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/190461a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The biogeography of Lessoniaceae, with special reference to Macrocystis C. Agardh (Phaeophyta: Laminariales) (1991)
    Springer
    Hydrobiologia 215 (1991), S. 1-11 
    Details
    ISSN: 1573-5117
    Keywords: Lessoniaceae ; Macrocystis ; Pacific Ocean ; biogeography ; vicariance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The bipolar distributions of Lessoniaceae and Macrocystis have been explained by migration out of a ‘centre of origin’ and across the tropics by means of dispersal, but controversy centres on the issue: which sector is the true centre of origin? We provide biological, palaeo-oceanographic and geological evidence that leads us to reject the centre of origin/migration theory and methodology in explaining ‘bipolarity’. As an alternative, a process of vicariant differentiation out of a Pacific Ocean/Southern Ocean ancestral complex is proposed. Moreover the biogeographic relationship between the southwest and northeast Pacific is shown to be a general phenomenon and not restricted to marine algae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005895
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    Paper (German National Licenses)
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