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Digitale Medien

Seasonal growth of the giant kelp Macrocystis pyrifera in New Zealand (1997)

Brown, M. T. ; Nyman, M. A. ; Keogh, J. A. ; [weitere]

Springer

Marine biology 129 (1997), S. 417-424

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ISSN: 1432-1793

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002270050182

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Digitale Medien

Efferent Innervation of Mammalian Muscle-spindles (1961)

BARKER, D. ; CHIN, N. K.

[s.l.] : Nature Publishing Group

Nature 190 (1961), S. 461-462

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [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 ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/190461a0

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Digitale Medien

The biogeography of Lessoniaceae, with special reference to Macrocystis C. Agardh (Phaeophyta: Laminariales) (1991)

Chin, N. K. M. ; Brown, M. T. ; Heads, M. J.

Springer

Hydrobiologia 215 (1991), S. 1-11

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ISSN: 1573-5117

Schlagwort(e): Lessoniaceae ; Macrocystis ; Pacific Ocean ; biogeography ; vicariance

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00005895

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