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  • Neodiprion autumnalis  (2)
  • 12-methoxyabietic acid  (1)
  • 34.80.Kw  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Influence of induced water stress in ponderosa pine on pine sawflies (1990)
    Springer
    Oecologia 83 (1990), S. 452-457 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Water stress ; Needle water potentital ; Pinus ponderosa ; Neodiprion fulviceps ; Neodiprion autumnalis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Three levels of water stress were induced on pole-size ponderosa pine (Pinus ponderosa) to determine the influence of plant moisture stress on oviposition, survival, and growth of two species of pine sawfly (Neodiprion fulviceps and N. autumnalis). It was found that water stress affected oviposition and subsequent egg survival but not larval development or survival. Stress had a negative effect on early season oviposition (N. fulviceps) and a positive effect on late season oviposition (N. autumnalis). Egg hatch was different between species and years and among treatment levels. Larval development, feeding, and survival were not affected by water stress. Overall, the effect of stress was not sufficient to explain population outbreaks of sawflies. Several hypotheses are presented as possible explanations for the observed experimental results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00317194
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  • 2
    Digitale Medien
    Digitale Medien
    Influence of watering and trenching ponderosa pine on a pine sawfly (1987)
    Springer
    Oecologia 71 (1987), S. 382-387 
    Details
    ISSN: 1432-1939
    Schlagwort(e): Host-herbivore interactions ; Water stress ; Herbivory ; Ponderosa pine ; Pinus ponderosa ; Diprionidae ; Sawflies ; Neodiprion autumnalis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Neodiprion autumnalis (Smith) larvae were caged for two successive years on root-trenched, watered, and untreated ponderosa pine (Pinus ponderosa Doug. ex Laws.) to determine effects of host moisture stress on larval feeding. Levels of moisture stress (as measured by the Scholander pressure chamber) differed significantly among treatment levels during 1984 and 1985 larval feeding periods. Differences in larval feeding success were not detected in 1984. In 1985, however, larvae on trenched (stressed) trees clipped and rejected more foliage, consumed more needles, had lower pupal weights, lower survival, and a longer feeding period than larvae on watered or untreated trees. Frass production did not differ among treatment levels. The length of the feeding period was shorter for larvae on watered trees than for larvae on untreated trees, but other measures of feeding success did not significantly differ between watered and untreated trees.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00378711
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  • 3
    Digitale Medien
    Digitale Medien
    Chemical basis of differential feeding behavior of the larch sawfly,Pristiphora erichsonii (Hartig) (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 599-614 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Larch ; tamarack ; larch sawfly ; Pristiphora erichsonii ; abietic acid ; dehydroabietic acid ; 12-methoxyabietic acid ; sandaracopimaric acid ; isopimaric acid ; Larix laricina
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The machanisms by which the larvae of the larch sawfly,Pristiphora erichsonii (Hartig), are prevented from feeding on the single needles of the new shoot of tamarack,Larix laricina (DuRoi) K. Koch, were studied. As a result of extensive purification attempts, five deterrent chemicals were isolated and identified. They are: abietic, dehydroabietic, 12-methoxyabietic, sandaracopimaric, and isopimaric acid. These chemicals, particularly the first two, are abundant in mid-July to August in the single needles and, apparently, provide the basis for the deterrency against the larval feeding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00987708
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  • 4
    Digitale Medien
    Digitale Medien
    Dielectronic recombination of lithium-like Ar15+ (1994)
    Springer
    The European physical journal 30 (1994), S. 291-306 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 34.80.Kw
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Dielectronic recombination (DR) of Ar15+(1s 22s) ions was studied in a single-pass merged-beams experiment at the UNILAC (universal linear accelerator) of GSI. Absolute recombination rates and cross sections were measured for electron-ion center-of-mass energies from 0 to 580 eV. A number of Rydberg states formed by DR with 2s → 2p (Δn=0) and 2s → 3ℓ (Δn=1) core excitations and even individual terms in the 1s 23ℓ3ℓ′ configuration could be resolved. Theoretical calculations of DR cross sections are in good overall agreement with the data. In the calculations for Δn=0 transitions, effects of electric fields have to be included to reproduce the magnitude of the measured DR rates at the limit of the 2 p 1/2ℓ and 2 p 3/2ℓ Rydberg series. Discrepancies between theory and experiment are observed at the series limits of the (1s 23ℓnℓ′) Rydberg series.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01426394
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