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  • 1
    Electronic Resource
    Electronic Resource
    A simple generalized model of attack by predators and parasites (1986)
    Springer
    Ecological research 1 (1986), S. 141-156 
    Details
    ISSN: 1440-1703
    Keywords: Functional response curve ; Instantaneous rate of attack ; Parasitism ; Predation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A generalized descriptive equation for the effect of prey density on the instantaneous rate of attack was proposed; $$A(N_0 ) = \frac{{T_t }}{{t_h + 1/\left[ {a'N_0 \exp (cN_0 )} \right]}}$$ whereA(N o ) is the number of attacks per predator during timeT t ,N o is the prey density,T t is the total time the prey was exposed,T h is the handling time per prey,a′ is the rate of successful search, andc is the facilitation coefficient. The proposed equation can describe all types of the functional response curves; withc=a′ t h (pseudo Type I), withc=0 (Type II), withc〉a′ t h (Type III), and withc〈0 (Type IV). The applicability of the equation was tested against the results of a simulation model and available laboratory and field data on predation. The equation described these data very well and in many cases yielded biologically interesting insights, although the equation was proposed primarily for descriptive purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347017
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Parasitic Wasp, Dinarmus basalis, Utilizes Oviposition-marking Pheromone of Host Azuki Bean Weevils As Host-Recognizing Kairomone (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 2677-2695 
    Details
    ISSN: 1573-1561
    Keywords: Parasitic wasp ; Dinarmus basalis ; kairomone ; host recognition ; azuki bean weevil ; Vigna angularis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A host-recognizing kairomone responsible for the stinging behavior of the parasitic wasp, Dinarmus basalis, was studied. Fresh azuki beans coated with an acetone extract of the azuki beans, from which both emerged wasps and their host weevils were removed, elicited stinging behavior from female wasps. The kairomone is a mixture of saturated hydrocarbons and diacylglycerols, both of which are required for activity. The kairomone is composed of normal and methyl-branched hydrocarbons with carbon numbers ranging from 25 to 35, most of which are known as the hydrocarbon constituents of an oviposition-marking pheromone of the host azuki bean weevils, Callosobruchus chinensis. This indicates that D. basalis utilizes the oviposition-marking pheromone of its host weevils as a host-recognizing kairomone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026425407150
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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