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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 38 (1985), S. 41-47 
    ISSN: 1570-7458
    Keywords: locomotory activity ; searching behaviour ; predator ; prey ; Carabidae ; Notiophilus biguttatus ; Collembola ; statistical power
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Verfolgung und der Angriff auf eine Beute folgt beim Laufkäfer Notiophilus biguttatus allein auf die visuelle Wahrnehmung bewegender Beutetiere. In der vorliegenden Arbeit wird gezeigt, das die Aktivität des Käfers sich ändert, wenn vorher in seiner Umgebung Beutetiere (Collembolen) anwesend waren. Diese Änderung bedeutet, dass beim Beutefang auch chemische Spuren benützt werden. Dabei wurden folgende Effekte auf die Lokomotion des Käfers festgestelt: eine beträchtliche Zunahme in der Frequenz von Stehenbleiben und Laufen und eine Abnahme der durchschnittlichen Zeitdauer der Läufe. Die adaptive Bedeutung dieser Effekte wird besprochen. Die Experimente wurden einer statistischen ‘power’-Analyse unterworfen. Die ‘power’-Analyse wurde eingesetzt zur Deutung nichtsignifikanter Ergebnisse und zum Vergleich der Empfindlichkeit verschiedener Aspekte der Lokomotion für den betreffende Reiz.
    Notes: Abstract In the predatory beetle Notiophilus biguttatus F. pursuit and attack of prey are induced by visual stimuli associated with prey movement. The study presented in this paper shows that locomotory activity in the predator is affected by prey (springtails — Collembola) previously occupying the relevant substratum. This implies that in prey detection non-visual stimuli are also used. The following effects on locomotion were observed as responses to the cues left by prey: a substantial increase in the frequency of stops and runs and a decrease in the average duration of runs. The adaptive significance of these effects is discussed. Analysis of the experiments includes an evaluation of the statistical powers of the tests used. The estimated powers were used to interpret nonsignificant results.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cultivation of microorganisms under growth limitation is a widely used technique in microbiology. The relevant investigations, though seemingly based on straightforward experiments, have generated conflicting results, e.g., concerning molar growth yields. The purpose of this paper is to show that discrepancies in the literature could be solved if more attention were paid to methodology, especially statistics. New experimental results, concerning growth limitations in Paracoccus denitrificans, will exemplify this. They include the following items. Two limitations, one of them being succinate limitation, were established in the present study. Molar growth yields on succinate were 41 g·mol-1 for succinate limitation (95% confidence limits were 38 and 44) and 32 g·mol-1 for the other limitation (95% confidence limits were 29 and 35). The latter result is compatible with sulphate limitation, but the present experimental design does not really permit this conclusion.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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