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  • 1
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Springer-Verl.
    Associated volumes
    Call number: PIK N 531-91-0112
    In: Ecological studies
    Type of Medium: Monograph available for loan
    Pages: XII, 435 S. : Ill., 141 graph. Darst.
    ISBN: 354017138X , 0-387-17138-X
    Series Statement: Ecological studies 61
    Branch Library: PIK Library
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  • 2
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This study compares the host-parasite relation betweenColeophora ? alcyonipennella andAgathis sp., on the one hand, andUrophora spp. andEurytoma tibialis, on the other hand.Coleophora-Agathis is a striking example for a host-parasite relation where the larval development of the parasitoid is controlled by the endocrine system of the host, which results in an optimal synchronization between the life-cycles of the moth and its specialized Braconid parasite. Attempts to obtain adultAgathis during the winter season for the biological control ofColeophora in New Zealand have met with considerable difficulties because of the hormonal dependence of the parasite on the host. The rearing and the transfer of adult parasites was not possible until the diapause of the host could be ended experimentally. In the complexUrophora-E. tibialis the parasite larvae interferes with the hormonal system controlling the development of the host. In hibernating generations ofUrophora spp. the parasite induces a premature onset of the process of pupation of the host, but consumes the latter when it has formed its puparium. In both hosts the hormonal reactivation of the diapausing full-grown larva results in a change of the position of the larva in its case or gall, before the morphogenetic changes involved in pupation take place. The larvae ofAgathis as well asE. tibialis do not kill their hosts until the latter have reversed their position within the case or gall. In this way the emergence ofAgathis from the case ofColeophora and the emergence ofE. tibialis from the gall ofUrophora is facilitated.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European journal of forest research 82 (1963), S. 392-392 
    ISSN: 1612-4677
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An account is given on the patterns of transfer of native parasites to introduced insect hosts. Several European Lepidoptera (Cnephasia. spp.,Paraswammerdamia caesiella, Calophasia lunula, Thymelicus lineola) and sawflies (Diprionidae spp.,Fenusa pusilla) introduced into North America are cited as examples to show the different modes in which a given parasite fauna may react to exotic insect species.
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  • 7
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary L. cyanella L. is known to occur in Europe, Siberia, and Japan. A map showing personal records ofL. cyanella on creeping thistle(Cirsium arvense) is given in Figure 2. Our findings suggest thatL. cyanella is more common and more evenly distributed in the western parts of Europe (western France and southern England) than in central Europe (Switzerland, Germany, Austria), where only a very small proportion of the thistle stands examined yielded the beetle. There are no personal records from southern Europe. The hibernating adults ofL. cyanella appear in late April and May on the rosettes and young shoots ofC. arvense, where they start feeding and ovipositing. The larvae which are covered with their faeces feed on the lower side of the leaves ofC. arvense. Pupation takes place in the soil. In the laboratory the whole development from egg to adult lasted about 35 days. There is only one generation per annuum. All available field observations ofL. cyanella refer toC. arvense as host plant (one record fromCirsium vulgare). “Short-term feeding tests” with adults ofL. cyanella yielded feeding responses withCarduus,Cirsium spp. andSilybum. Test plants belonging to 17 other genera of the Compositae family were not accepted. As shown in Table 1 this “Carduus-Cirsium-Silybum pattern” has also been found in feeding experiments with other highly specialized thistle insects. Within its subfamily (Criocerinae)L. cyanella appears to have developed a unique host association, since to date no related species are known to feed on thistles or other Cynareae. Because of its high degree of host specifityL. cyanella may be a potential candidate insect for the biological control of creeping thistle in North America. Further feeding tests with larvae and investigations as to the reasons for the scarcity ofL. cyanella in central Europe should be made, before a definite decision about the usefulness ofL. cyanella as a biological control agent can be taken.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    BioControl 2 (1957), S. 173-196 
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zusammenfassung Innerhalb eines Mischwaldbestandes der Vogesen wurde 1956 die Parasitierung der TortricidenChoristoneura (Cacoecia) murinana,Hb.,Eucosma (Semasia) rufimitrana H.s.,Archips (Cacoecia xylosteana l. undTortrix viridana l. vergleichend untersucht. Die innerhalb eines Parasitenkreises beobachteten Konkurrenzerscheinungen und die zwischender vier bearbeiteten Parasitenkomplexen gefundenen Wechselbeziehungen wurden qualitativ und quantitativ dargestellt (Abb. 2 und 3). Zwischen der theoretisch erwarteten Wirtswahl der untersuchten polyphagen Parasiten und den im Freiland beobachteten Verhältnissen ergab sich ein beträchtlicher Unterschied. Die bei der Mehrzahl der gezüchteten Parasitenarten vorhandene potentielle Polyphagie kam zwar in der Erscheinung zum Ausdruck, dass hier vielfach 2 oder 3 der 4 geprüften Wirtsarten gleichzeitig befallen worden waren, aber das Schwergewicht der Parasitierung richtete sich immer nur gegen eine Wirtsart, obwohl eine «räumliche und zeitliche Koinzidenz» zwischen Wirt und Parasit (Thalenhorst 1951) auch in weiteren Fällen gegeben gewesen wäre. Eine solche beschränkte Wirtswahl kann, wie die durch Freilandversuche an der IchneumonideApechthis rufata gmel. gewonnenen Ergebnisse zeigen, durch einseitiges Anfliegen bestimmter Futterpflanzen der Wirte veranlasst sein. Der Vergleich zwischen der Wirtswahl in verschiedenen Beobachtungsgebieten weist schliesslich darauf hin, dass das Verhalten im Freiland bei manchen Parasitenarten weitgehen unberechenbar ist. Neben der Lebensweise der untersuchten Wirtsarten war auch die Hyperparasitierung für das Ausmass der durch die Parasiten verursachten Wirtsmortalität von Bedeutung. Während die aus der Biozönose stammende HyperparasitengarniturC. murinana und die beiden Eichentortriciden in etwa gleichem Grad befield, wurde bei dem erstgenannten Wirt noch eine schwerezusätzliche Beeinflussung der Larvenparasiten-Gruppe von seiten einiger, auch primär wirksamer Puppenparasiten festgestellt (Abb. 2). Diese Konkurrenzerscheinungen innerhalb des Parasitenkreises dürfte weitgehend für die Tatsache verantwortlich sein, dass beiC. murinana — im Gegensatz zu den Verhältnissen beiT. viridana undA. xylosteana — die Larvenparasitierung wesentlich unbedeutender ist als die Puppenparasitierung.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1939
    Keywords: Community strucure ; Ectophagy ; Endophagy ; Herbivores ; Limiting similarity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ecological meaning of size relationships within guilds is still a matter of debate. We analyzed the niches and size relationships in Coleoptera associated with Cardueae host plants. Species were grouped into guilds using distributional data, host records and feeding strategies: a) The species of the genus Larinus are inhabitants of flower heads within the Cynaroideae. Two types of Larinus species were distinguished: one type attacks immature flower heads, the other exploits the floer heads in a more advanced stage. The females of the first group have elongated rostres adapted to piercing through the bracts of closed flower heads, the other group possesses blunt, short rostres. For an oligophagous group of four Larinus species we are able to show that the distribution of average female rostre length is non-random. b) In southern France four stem boring species of the genera Agapanthia and Lixus coexist within the same hosts. The frequency distributions of body length from these species are clearly overdispersed. c) Coexisting species of the folivorous genus Cassida show no differences in body sizes. We conclude that morphometric differences within the investigated guild of endophytic species (Larinus and Agapanthia/Lixus) evolved in response to size of the used plant structures and the size of potentially competing species, a pattern not evident in ectophytic species. We suggest that these differences are part of a general pattern as the evolution of herbivorous guild may strongly depend on the way how the host resource is exploited (endophagy vs ectophagy). So current differences in statements on the organization of herbivore communities could perhaps be reconciled.
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