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A method for estimating the significance of surface dispersal for population fluctuations of Collembola in arable land



A method for estimating the significance of surface dispersal for population fluctuations of Collembola in arable land



Pedobiologia 41(1-3): 115-122



Recent studies have shown marked differences between Collembola communities in a field and a nearby fallow which had both been managed in a similar manner before management conversion. To investigate the extent to which these differences could be attributed to surface dispersal, small pitfall traps, provided with fences, were used to determine directions of dispersal. The dominant Collembola trapped in pitfalls were Isotomurus palustris, Lepidocyrtus cyaneus and Sminthuridae. Isotoma viridis and the Genus Folsomia were subdominant or seldom caught in pitfall traps. The number of Collembola trapped in pitfalls decreased from field to fallow, suggesting a lower activity under more favourable conditions in the fallow. The dispersal direction of Collembola depended on barrier position (field, borderline, or fallow). The most striking differences between the soil communities, within the Genus Folsomia, could not be assigned to surface dispersal, whereas the higher or increasing proportions of Isotomurus palustris and Sminthuridae in the fallow compared to the wheat field could partly be explained by migration.

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