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  • 1
    Monograph available for loan
    Monograph available for loan
    Auswirkungen von klimatischen Variationen auf Wasserhaushalt und Abfluss im Flussgebiet des Rheins (1997)
    Zürich : Hochschul-Verlag an der ETH
    Details Availability
    Call number: PIK N 456-98-0381
    Type of Medium: Monograph available for loan
    Pages: 147 S.
    ISBN: 372812396x
    Series Statement: Schlussbericht NFP 31
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    Host race pheromone polymorphism in the larch budmoth (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 892-894 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Analysis of the sex gland content ofZeiraphera diniana females and field responses of males to synthetic compounds show that the sympatrically occurring food specialists on various coniferous hosts use different blends ofE-9-dodecenyl acetate andE-11-tetradecenyl acetate as sex pheromones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952013
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamics of Larch Bud Moth Populations (1977)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 22 (1977), S. 79-100 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.en.22.010177.000455
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  • 4
    Electronic Resource
    Electronic Resource
    Observations of an aphid infestation on hawthorn in the vicinity of a motorway (1978)
    Springer
    Naturwissenschaften 65 (1978), S. 654-655 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401912
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  • 5
    Electronic Resource
    Electronic Resource
    Why the larch bud-moth cycle collapsed in the subalpine larch-cembran pine forests in the year 1990 for the first time since 1850 (1993)
    Springer
    Oecologia 94 (1993), S. 62-66 
    Details
    ISSN: 1432-1939
    Keywords: Zeiraphera diniana ; Population cycle ; Climate change ; Weather impact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The larch bud-moth cycle has been observed in the sub-alpine larch-cembran pine forests 16 times since 1850. Infestation is easily recognized by the characteristic red-brown discoloration of the larch crowns due to the wasteful feeding of the bud moth larvae. The heaviest defoliation recurs at intervals of 8.47±0.27 (SE) years, and the larval density per kilogram of larch branches varies more than 10000-fold over four or five generations. The basic regulatory mechanism for this cycle is the induced change in food quality for the two or more subsequent larval generations. Defoliation functions as a negative feedback mechanism acting on larval density. In 1989 local discoloration in the Upper Engadine valley was observed in the usual first focus. In 1990 and 1991, however, instead of the expected widespread defoliation damage, larval densities decreased drastically. Based on extensive field data collected from 1961 to 1991 on the development and the survival of the bud moth (Zeiraphera diniana Gn.) and the phenology of the host, Larix decidua L., this paper shows the effect of weather on survival in the egg stage and on the coincidence of larval hatching with the sprouting of the larch. It is shown that the winter and spring weather conditions in 1989–1991 were conducive to unusually high egg mortality. Since these conditions occurred in three successive generations, population growth was effectively reduced and the cycle collapsed prematurely. Thus the rather persistent cyclicity of the larch-larch bud-moth system was disturbed by weather conditions with a very low probability of occurrence, but due to the inherent high resilience of the system, the next population peak with visible defoliation is expected to occur 1996/1997, provided that the weather conditions return to the climatic standard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317302
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  • 6
    Electronic Resource
    Electronic Resource
    A contribution to the explanation of the larch bud moth cycle, the polymorphic fitness hypothesis (1993)
    Springer
    Oecologia 93 (1993), S. 251-255 
    Details
    ISSN: 1432-1939
    Keywords: Zeiraphera diniana ; Population cycle ; Polymorphic fitness ; Assortative mating
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Studies of fluctuating insect populations generally discuss the regulating processes at high insect numbers, but very rarely why a cycling population at low densities switches immediately from the declining phase to the increasing phase of the cycle. A long-term study of the larch bud moth (Zeiraphera diniana Gn) has suggested that the key to recovery is assortative mating of specific phenotypes. Z. diniana exhibits distinct host races living either on the deciduous larch or evergreen pines and spruces. As an adaptation to its hosts Z. diniana is necessarily rather polymorphic in its life history parameters, i.e. developmental rate, fertility and survival. Apart from the direct association of the larva with the host tree, the colouration of the mature larva provides the only readily apparent trait by which the host race can be recognised; the larch form is black and the pine or spruce form has a light orange head capsule, anal plate and body colour. Evidence that frequencies of the colour morphs on larch regularly change from an intermediate colour type to black during the increasing phase of the cycle suggests that the combination of traits, such as earliest larval emergence, largest body size and homozygosity, characteristic of the black morph, constitutes the inherent driving force of population increase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317678
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  • 7
    Electronic Resource
    Electronic Resource
    Oviposition efficiency of the grey larch bud moth (Zeiraphera diniana) on different substrates and its relevance to the population dynamics of the moth (1977)
    Springer
    Entomologia experimentalis et applicata 21 (1977), S. 88-97 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Weibchen des Grauen Lärchenwicklers (Zeiraphera diniana Gn.) legen auf Lärchenzweigen mit Parmelia-Flechten aus dem subalpinen Gradationsareal statistisch gesichert mehr Eier ab als auf Lärchenzweigen ohne Flechten aus dem collinen Verbreitungsgebiet. Die Anzahl und die Lage der abgelegten Eier sowie das Verhalten der Weibchen deuten darauf hin, dass thigmotaktische Reize des Ovipositors die vorausgegangene olfaktorische und mechanische Stimulation der Antennen und Tarsen ergänzen müssen, damit eine optimale Eiablage gewährleistet sei. Die Tatsache, dass die Ovipositionsleistung auf Lärchenzweigen ohne Flechten um ca. 50% verringert wird, dürfte von Bedeutung für die Determination des latenten Fluktuationstypus der Art sein.
    Notes: Abstract Females of the grey larch bud moth (Zeiraphera diniana Gn.) (Lepidoptera, Tortricidae) laid significantly more eggs on larch branches covered with naturally occurring Parmelia lichens than on branches without them. Numbers of eggs deposited and behaviour suggest that besides olfactory and mechanical stimuli from the antennae and the tarsi, thigmotactic stimuli perceived by the ovipositor play an important role for optimum oviposition. The fact that oviposition efficiency is reduced by 50% on larch branches from the lowland region of Europe where no lichens occur, is considered to be of importance for the determination of the fluctuations at low density in the lowland region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300346
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  • 8
    Electronic Resource
    Electronic Resource
    Change in proportion of larval colourtypes of the larchform Zeiraphera diniana when reared on two media (1972)
    Springer
    Entomologia experimentalis et applicata 15 (1972), S. 287-298 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Im Verlaufe einer Massenvermehrung des Grauen Lärchenwicklers verändern sich die relativen Anteile der larvalen Farbtypen. Es wurde vermutet, daß diese Erscheinung mit der dichtebedingten Schädigung der Wirtspflanze und einer nachfolgenden Änderung der Nahrungsqualität gekoppelt sei. Zwecks Abklärung dieser Hypothese wählte man aus Freiland-populationen Individuen bestimmter Farbtypen aus und züchtete die F1-Generation auf frischen Kurztrieben der Lärche und auf einem semi-synthetischen Nährmedium. Es konnte gezeigt werden, daß nicht nur die Larval-Mortalitäten auf den beiden Nährmedien voneinander abweichen, sondern daß auch die Anteile der Farbtypen in den entsprechenden Gruppen verschieden sind. Die Versuche lassen schließen, daß unter. Nahrungsstress die dunklen Farbtypen während der frühen Larvenstadien eine höhere Mortalität erleiden und somit die Selektion zu einem Wechsel in der Zusammensetzung der Farbtypen der folgenden Generation beiträgt. Zusätzlich beobachtet man aber, daß unter Nahrungsstress die Übereinstimmung zwischen dem elterlichen Farbtyp und jenem der Nachkommen größer ist. Somit bekräftigen die Resultate die Annahme einer variablen Leistungsfähigkeit der Population in bezug auf Nahrungsstress während einer Massenvermehrung.
    Notes: Abstract In the course of a population cycle of the Grey Larch Bud Moth it was observed that the proportions of larval colourtypes change. This was believed to be attributable to density induced changes in the food quality of the host plant during the cycle. Selected representatives of naturally occurring larval populations were reared in controlled laboratory conditions on freshly cut larch shoots and on a semi-synthetic food medium. Larval mortality on the laboratory culture media was shown to be different and the proportions of colour forms in the resultant and corresponding groups also differed. These experiments suggest higher mortality of early-instar larvae of the dark colourtype under food-stress conditions and a resulting change in colourtype composition of the next generation. Further to this there is an indication that effective true-breeding is more likely under food-stress conditions. The results support the hypothesis for a changing population fitness with regard to food-stress conditions throughout a gradation cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428293
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  • 9
    Electronic Resource
    Electronic Resource
    Freilanduntersuchungen zur Sexuallockstoff-Reaktion der Fichtenform des grauen Lärchenwicklers, Zeiraphera diniana Gn. (Lep., Tortricidae) (1979)
    Springer
    Journal of pest science 52 (1979), S. 129-130 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Males of the larch bud moth developing onPicea excelsa in the ČSSR respond when tested by the electroantenno-grammethod or in the field much stronger to (E)-9-dodecenyl acetate (E 9–12 Ac) as to the (E)-11-tetradecenyl acetate (E 11–14 Ac) which is maximally prefered by the larch bud moth developing onLarix decidua. Thus the spruce form exhibits a similar reaction as the males developing onPinus cembra sympatrically with the larch form in the Alps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01988783
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  • 10
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    Spatial modelling of ecological indicator values improves predictions of plant distributions in complex landscapes (2020)
    Wiley
    Details
    Publication Date: 2020-07-14
    Print ISSN: 0906-7590
    Electronic ISSN: 1600-0587
    Topics: Biology
    Published by Wiley
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