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  • Articles  (12)
  • 1990-1994  (12)
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  • Articles  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Gustatory sensitivity of the herbivore Tilapia zillii to amino acids (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 36 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The gustatory sensitivity of the herbivorous fish Tilapia zillii was investigated using electrophysiological techniques. Integrated responses from facial taste nerves were recorded during stimulation by l l amino acids. All compounds proved to be effective stimuli. The relative stimulatory efficacy (RSE) determined at 1 × 10 −3 m indicated that stimuli can be organized into three groups on the basis of similarity of efficacy. Effects of pH which altered the RSE of some amino acids are documented. Amino acid RSE differed to some extent from those of previously studied carnivorous fish. There was concordance between the composition of preferred food, effective feeding stimuli and the peripheral receptor responses. These observations support the hypothesis that peripheral chemosensitivity might serve as a mechanism of feeding specialization in some fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb03559.x
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  • 2
    Electronic Resource
    Electronic Resource
    Tree decline in southeastern Australia: Nitrate reductase activity and indications of unbalanced nutrition in Eucalyptus ovata (Labill.) and E. camphora (R.T. Baker) communities at Yellingbo, Victoria (1994)
    Springer
    Oecologia 98 (1994), S. 221-228 
    Details
    ISSN: 1432-1939
    Keywords: Eucalyptus ; Nitrate reductase ; Nitrogen Salinity ; Tree decline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The decline of riparian Eucalyptus camphora/E. ovata stands is examined in relation to an increase in nitrogen availability and to rising salinity in low-lying areas. There are several indications that declining stands are abnormally rich in N: (i) Nitrogen availability in declining stands was greater than that recorded in other Australian forests, was dominated by nitrification and was extremely variable. (ii) Nitrate concentrations in free soil water from declining forest on a dry site were many times those in the corresponding healthy forest. (iii) N/Mg ratios in foliage of declining trees on drier sites were at the extreme end of the recorded range and similar to those found in eucalypt plantations on agricultural soils. In addition, sites where the overstorey eucalypts are declining have been invaded by a variety of herbaceous weeds, most of which display characteristics of nitrophilous plants, e.g. nitrate reductase activity was greater in herbaceous weeds than in native overstorey or understory species in declining stands of E. camphora/E. ovata and was directly related to the concentration of nitrogen in foliage. These observations are consistent with recent suggestions that forest ecosystems may become N-saturated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00341475
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  • 3
    Electronic Resource
    Electronic Resource
    Phosphatase activity and phosphorus fractions in Karri (Eucalyptus diversicolor F. Muell.) forest soils (1992)
    Springer
    Biology and fertility of soils 14 (1992), S. 200-204 
    Details
    ISSN: 1432-0789
    Keywords: Phosphorus fractions ; Phosphatase ; Eucalyptus diversicolor ; Organic forest soils ; Mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Karri forest soils contain negligible concentrations of labile-P, low concentrations of total P and more P in organic forms than inorganic. The ratio of organic P to inorganic P was lowest (1:2) in recently burnt surface soils and greatest (7:1) at depth in soil that had been undisturbed for long periods of time. Phosphomonoesterase and phosphodiesterase activities (to 10 cm depth, phosphomonoesterase 700–1300; phosphodiesterase 2000–2400 μg nitrophenol released h-1 g-1 fresh weight) were comparable to those in other, organically rich forest soils. The optimum pH for phosphatase activities were within 1–2 units of soil pH (∼6) and little reduction in activity was observed over the pH range 4–8. Phosphatase activity was reduced by air-drying (up to 20-fold reduction) and was almost entirely absent in soils that were heat-affected as a result of logging/burning operations. Neither phosphomonoesterase nor phosphodiesterase were directly related to soil P fractions or total P. A reduction in P demand is postulated as the cause of reduced phosphatase activity and the increased concentration of organic P with increasing soil depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346061
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  • 4
    Electronic Resource
    Electronic Resource
    Nitrogen and phosphorus cycling in relation to stand age of Eucalypus regnans F. Muell. (1992)
    Springer
    Plant and soil 142 (1992), S. 167-176 
    Details
    ISSN: 1573-5036
    Keywords: Eucalyptus regnans ; mineralization ; nitrification ; nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Laboratory and in situ rates of N mineralization in soils from Mountain Ash (Eucalyptus regnans) forests were measured fortnightly for two years in stands aged 9, 40, 80 and about 250 years (overmature), and for one year in stands aged 5 and 46 years. Rates of anaerobic mineralization (the laboratory test) showed little seasonal or annual variation. In contrast, rates of in situ mineralization varied markedly with season, being highest in spring and summer. Anaerobic mineralization was highly correlated with stand age to 80 years, but decreased between ages 80 and 250 years. In situ mineralization also decreased between these two ages, but otherwise was not related to stand age. Hence, the correlation between anaerobic and in situ mineralization along the age sequence was weak, suggesting that the anaerobic test is of maximum utility when this pool is in balance with inputs from decomposing litter (‘steady-state’ ecosystems). Nitrification was strong in stands aged 9, 46, 80 and 250 years and weak in stands aged 5 and 40 years. Within stands, the rate of nitrification during each period of in situ containment was highly dependent on the supply of NH4 ions. Between stands, annual rates of nitrification appear to be related to the balance between the N capital of the site, its rate of turnover, and the demand for N by heterotrophs and vegetation so that if NH4 supply is depleted, little is left for autotrophic nitrifiers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010963
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrogen and phosphorus cycling in relation to stand age of Eucalyptus regnans F. Muell (1992)
    Springer
    Plant and soil 142 (1992), S. 177-185 
    Details
    ISSN: 1573-5036
    Keywords: Eucalyptus regnans ; microbial phosphorus ; organic phosphorus ; soil P tests ; P availability ; phosphatase activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Concentrations of labile inorganic P (Pi, dilute double acid-extractable), labile organic P (Po, bicarbonate-extractable), microbial P, and phosphatase activities were measured in Mountain Ash (Eucalyptus regnans) stands aged 0, 5, 9, 16, 40, 46, 80 and 250 years. Labile Pi, initially 34 μg g-1 at age 0 years, decreased to 2.3 μg g-1 at age 16 years, and was constant thereafter. All other indices of available P increased with stand age. Microbial P varied the most along the age sequence, from 1.8 μg g-1 at 0 years to 99 μg g-1 at age 80 years. Oxidation of organic P during the regeneration burn creates a large and readily available source of Pi for the young, developing stand. After canopy closure, the stand becomes increasingly dependent on P released by mineralization. Phosphatase activities were as high as have been recorded, and the organic pools are therefore significant stores of potentially available P. At age 80 years (for example) the amount of labile Po and microbial P in the surface 5 cm of soil was 26 kg ha-1. However, the adsorption maxima for Pi fixation were also as high as has been recorded, and so it is apparent that roots must possess specialized mechanisms of uptake to compete for mineralized P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010964
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  • 6
    Electronic Resource
    Electronic Resource
    Availability of organic and inorganic forms of phosphorus to lupins (Lupinus spp.) (1992)
    Springer
    Plant and soil 145 (1992), S. 107-113 
    Details
    ISSN: 1573-5036
    Keywords: choline phosphate ; glycero phosphate ; inositol phosphate ; lupins ; phosphatase ; phosphorus availability ; pyro phosphate ; RNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Inositol phosphate is at least equal to KH2PO4 as a source of P for the growth of lupins in sand but a much poorer source in soil. RNA and glycerophosphate were excellent sources of P for lupin growth in a P-fixing soil. Soil and root phosphatase activity were not altered by amendment of soils with either inorganic- or organic-P. The difference in availability of differing P-sources is related to their solubility in soils rather than susceptibility to phosphatases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009546
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  • 7
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    Phosphatase activity and phosphorus fractions in Karri (Eucalyptus diversicolor F. Muell.) forest soils (1992)
    Springer
    Details
    Publication Date: 1992-11-01
    Print ISSN: 0178-2762
    Electronic ISSN: 1432-0789
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 8
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    Nitrogen and phosphorus cycling in relation to stand age of Eucalypus regnans F. Muell. (1992)
    Springer
    Details
    Publication Date: 1992-05-01
    Print ISSN: 0032-079X
    Electronic ISSN: 1573-5036
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 9
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    Availability of organic and inorganic forms of phosphorus to lupins (Lupinus spp.) (1992)
    Springer
    Details
    Publication Date: 1992-09-01
    Print ISSN: 0032-079X
    Electronic ISSN: 1573-5036
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 10
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    Nitrogen and phosphorus cycling in relation to stand age of Eucalyptus regnans F. Muell (1992)
    Springer
    Details
    Publication Date: 1992-05-01
    Print ISSN: 0032-079X
    Electronic ISSN: 1573-5036
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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