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De Harkwesp in de kustduinen. Bedreigd door begrazing en recreatie?
Bonte, D. (2006). De Harkwesp in de kustduinen. Bedreigd door begrazing en recreatie? Natuur.Focus 5(3): 87-90
In: Natuur.Focus. Natuurpunt: Mechelen. ISSN 1379-8863, more
Peer reviewed article  
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Keywords
    Insect
    Wasps
    Bembix rostrata; Hymenoptera [WoRMS]
    Terrestrial
Author  Top 
Abstract
    Data on nesting densities of Bembix rostrata, a digger wasp inhabiting dynamic coastal dunes,were used to document the detrimental effects of trampling by cattle and vacationers. Both types of disturbance resulted in similar sand displacement and prey availability. Nesting densities of Europe’s largest digger wasp declined dramatically with increasing trampling, probably below the critical population size. Hence, additional human disturbance, although resulting in similar environmental conditions compared to natural disturbance, significantly affected local population sizes.As a result, anthropogenic disturbance in order to restore or conserve natural dynamics has to be avoided and efforts to restore natural dynamics in a more natural way should be promoted. Although this is here only documented for one large specialised invertebrate, the application of traditional management techniques, such as grazing by large herbivores, within newly evolved landscapes may introduces new pressures that affect pre-adapted species to natural disturbances negatively within short time spans.
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