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  • 11
    Electronic Resource
    Electronic Resource
    Regional Plant Ecology in the United States (1944)
    [s.l.] : Nature Publishing Group
    Nature 154 (1944), S. 42-43 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE last four years has seen the publication, by A J. H. Davis, of three important papers on the vegetation of Southern Florida*. These three valuable papers yield a clear picture of the vegetation and its interrelations with soil types, climate and physiography. The area is especially interesting ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/154042a0
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  • 12
    Electronic Resource
    Electronic Resource
    The Kelp Trade (1945)
    [s.l.] : Nature Publishing Group
    Nature 155 (1945), S. 673-674 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE formation of the Scottish Seaweed Research Association last year stimulates one to inquire into the somewhat chequered history of what is known as the kelp industry. At one time this assumed considerable importance in Europe and afterwards spread to the United States and Japan, the last-named ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/155673a0
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  • 13
    Electronic Resource
    Electronic Resource
    Biological Research in the West Indies (1943)
    [s.l.] : Nature Publishing Group
    Nature 152 (1943), S. 47-47 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AT present, considerable interest is being evinced about development of the Colonies of the British Empire, particularly the West Indies. Plans have been, and probably still are being, made for utilizing the resources of the West Indies. In 1939 I had the privilege of leading a strong ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/152047a0
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  • 14
    Electronic Resource
    Electronic Resource
    Marine Biological Research in Great Britain (1944)
    [s.l.] : Nature Publishing Group
    Nature 154 (1944), S. 301-301 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I WOULD like to endorse Prof. F. E. Fritsch's letter in Nature of July 29 on this subject. It is regrettable that a country such as ours with many suitable habitats for marine algæ should lag behind Continental countries in the study of this particular group of plants. Both the last and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/154301a0
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  • 15
    Electronic Resource
    Electronic Resource
    Biology of excessive weed growth in the hydro-electric lakes of the Waikato River, New Zealand (1974)
    Springer
    Hydrobiologia 44 (1974), S. 349-363 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In 1965 a massive growth of Ceratophyllum demersum caused the shut-down of one power station (Ohakuri) on the Waikato River. As a result a study was commenced of the biology of the weeds in the Waikato hydro-electric lakes. There are four major exotic weeds, Ceratophyllum, Lagarosiphon major, Egeria densa and Elodea canadensis, all of which form extensive beds. The first three have only appeared in the lakes since 1960 but Elodea was probably present earlier. Efforts to control the excessive growth by diquat have not proved successful and booms protecting the intake fail when a massive amount of weed is liberated after storms. Reasonable control can be obtained by means of lake lowering in mid-summer. Studies of Lagarosiphon, Egeria and Ceratophyllum have enabled the water temperature range, compensation points and certain nutrient requirements to be established under New Zealand conditions. Significant regions in the upper Waikato River are highly thermal and these waters are rich in arsenic. The weeds accumulate this arsenic and values of over 1000 ppm dry wt. have been recorded. This makes them very unsuitable for stock feed if mechanical harvesting were to be employed. Ceratophyllum and Lagarosiphon both appear to be shade plants, the former existing in a coarse winter form and a finer summer form. Day length affects growth rate as also does light quality, dissolved bicarbonate and rate of water flow. Limnological data show a gradual nitrogen enrichment of the lakes as one passes downstream, with periodic local phosphate enrichment after pasture top-dressing activities. Soluble iron is present in the waters and this appears to be important for massive growth. In quieter waters massive Lagarosiphon growth can result in temporary oxygen depletion of the water as compared with open lake water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036301
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  • 16
    Electronic Resource
    Electronic Resource
    Submerged vegetation of the Rotorua and Waikato lakes 3. Lake Rerewhakaiitu (1975)
    Springer
    Hydrobiologia 47 (1975), S. 399-413 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The submerged and emergent aquatic macrophyte vegetation of the eutrophic Lake Rerewhakaiitu was surveyed in February–March 1973, and is described qualitatively. At the time the lowered lake level had resulted in producing a sward of normally submerged aquatics as land forms. The principal dominant in the sward is Myriophyllum propinquum, the plants being greatly reduced in length to short stems with single entire leaves. At the uppermost levels Tillaea sinclairii is a significant component of the sward, and at lower levels Lilaeopsis lacustris behaves similarly. Below the uppermost submerged belt of macrophytes there is a characean meadow of Chara fibrosa and C. australis which in deeper waters gives way to Potamogeton ochreatus with either C. australis or Nitella hookeri. The high degree of eutrophication and consequent low light penetration has resulted in a vegetation limit at 4.5–5 m, which is lower than that found in other Rotorua lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039585
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  • 17
    Electronic Resource
    Electronic Resource
    A Contribution to the Biology of Nitella hookeri A. Br. in the Rotorua Lakes, New Zealand (1974)
    Springer
    Hydrobiologia 45 (1974), S. 91-113 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitella hookeri A. BR., a native charophyte of the Rotorua lakes in the North Island of New Zealand, was investigated in terms of its nutrient requirements under laboratory culture in non-arenic conditions. Optimum growth in phosphate, nitrate, ammonia, iron and magnesium occurred at 20 mg l−1 or lower. Higher concentrations of these ions were markedly inhibitory to growth when compared with the optimum. Calcium and potassium gave growth at higher levels and over a wider range of concentrations. Sulphate and sulphur-amino acids do not promote growth above the levels of the basal medium (1.2 mg l−1 sulphur as SO2− 4). Amino acids did not appear to provide a nitrogen source for the plant. The optimum phosphate concentration was one thousand times higher than previously reported values. This may be due to the presence of arsenic in the vegetative propagules used from Lake Rotoiti. Iron toxicity effects may have resulted from the presence of EDTA. The results are considered in relation to the known levels of nutrients present in lake waters. Only phosphorus appears directly correlated with the natural distribution of the plant but it is suggested that anaerobic lake substrates may contribute iron and ammonia to the plants and further explain their distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006448
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  • 18
    Electronic Resource
    Electronic Resource
    A Contribution to the Biology of Nitella hookeri A. Br. in the Rotorua Lakes, New Zealand II. Organic nutrients and physical factors (1974)
    Springer
    Hydrobiologia 45 (1974), S. 157-168 
    Details
    ISSN: 1573-5117
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth of Nitella hookeri A.Br. in non-axenic cultures, with or without soil extract, is not appreciably stimulated by the addition of vitamins, coenzymes and growth hormones. Vitamins B1, B6 and nicotinamide increased growth slightly but only at concentrations exceeding those found in the field. Kinetin inhibited growth at all concentrations. A temperature of 17°C gave the best growth measured by linear increment, dry weight and fresh weight. Growth ceased at 10°C or 25°C. Increased light intensities gave increasing growth but 600 lux for a 12 hour day appeared to be the best long term conditions. Patterns were confused in showing differences between the parameters measured and indicate a more rigid assessment of growth is required for such studies. The factors defined by the laboratory experiments are in general accord with field conditions in the Rotorua lakes where Nitella grows well. However, winter growth at temperatures of about 10°C still occurs in the field so that culture conditions have not completely defined all growth factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013998
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  • 19
    Electronic Resource
    Electronic Resource
    Determination of low boron concentrations in nutrient solution (1996)
    Springer
    Plant and soil 180 (1996), S. 97-99 
    Details
    ISSN: 1573-5036
    Keywords: boron ; ICPAES ; nutrient solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To study boron (B) deficiency and toxicity in plants in flowing solution culture, it is necessary to establish a wide range of solution B concentrations. The ability of inductively coupled plasma atomic emisson spectrophotometry (ICPAES) to determine solution B concentrations ranging from 0.15 μM to 925 μM was investigated. The reliablity of B concentration determination in nutrient solutions containing 〈10 μM B is poor. A technique, involving sorption by a B-specific resin (Amberlite-743), was established to concentrate the B present in low B nutrient solutions and to enable reliable measurement using ICPAES following elution from the resin. Acceptable, reproducible recoveries of B from low B solutions, containing known concentrations of B, were obtained using this technique. The technique enables the imposition, monitoring and maintenance of solution B concentrations well below the direct detection limits of ICPAES and colorimetric procedures. ei]L V Kochian
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015415
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  • 20
    Electronic Resource
    Electronic Resource
    Salt marshes and ecological terminology (1959)
    Springer
    Plant ecology 8 (1959), S. 215-234 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241551
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