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  • 1
    Electronic Resource
    Electronic Resource
    Foraging for mates in the hyperparasitic wasp, Dendrocerus carpenteri: impact of unfavourable weather conditions and parasitoid age (1999)
    Springer
    Oecologia 119 (1999), S. 73-80 
    Details
    ISSN: 1432-1939
    Keywords: Key words Hyperparasitoid ; Males ; Foraging behaviour ; Mating success ; Age effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Males of the aphid hyperparasitoid Dendrocerus carpenteri (Curtis) were attracted by a sex pheromone released by conspecific females. The intensity of this cue, and thus female attractiveness, depended both on the female's mating status and her age. Only virgin females younger than 2 h were consistently recognized as mates by foraging males. Male age did not influence foraging and mating success. Empty mummies, from which females had emerged within the previous 10 min were attractive to males and examined intensively. Rain reduced the searching success of males, although the host plant Vicia faba provided sheltered places. Wind did not reduce mating success but prevented both sexes from leaving the host plant. Since the time of female attractiveness seems to be very limited, wind may have an enormous effect on the mating success of D. carpenteri in the field and thus on the population dynamics of this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050762
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of pesticides and heavy metals on biological processes in soil (1984)
    Springer
    Plant and soil 76 (1984), S. 367-378 
    Details
    ISSN: 1573-5036
    Keywords: Assessment ; Distribution ; Heavy metals ; Impact ; Input ; Microbial processes ; Pesticides ; Side-effects ; Soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The side-effects of pesticides and metal cations are reviewed with regard to input, distribution, persistence and toxicity. The sensitivity of microbial processes is discussed in relation to adaptability and resistance of microbial populations. Procedures for an ecological assessment of toxic side-effects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205594
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    Paper (German National Licenses)
    Fulltext
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