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| Bruus, Marianne; Axelsen, Jørgen Aagaard; Tybirk, Knud. |
| Generally, it is expected to find food webs and food chains in all ecosystems, also highly disturbed ones such as agricultural fields. However, in a preliminary study in Danish conventionally managed fields it was not possible to identify food web nodes between weeds and herbivores, and it was hypothesized that the weed density in conventionally managed Danish agricultural fields were too low to support a more or less specialised herbivorous arthropod fauna. This hypothesis was investigated through an analysis of data on weeds and arthropods from conventionally and organically managed fields in Denmark. Sampling of arthropods was done by aid of D-vac and the sampling of weeds and crop was done at exactly the same site within two days. Most weeds and some... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2013 |
URL: http://orgprints.org/23252/2/23252.pdf |
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| Bruus, Marianne; Axelsen, Jørgen Aagaard; Tybirk, Knud. |
| Weeds are important as food for both herbivorous insects and farmland birds. Especially monophagous, herbivorous insects depend on the presence of one or a few weed species, and consequently a shortage of such weed species may hamper parts of the food web of the agricultural ecosystem. In any ecosystem on the earth food webs and food chains are expected, i.e. that there are species from one trophic level feeding on the lower trophic levels. These levels may be organised as organic matter – degrader, plant – herbivore and predator – prey, where preys may be degraders, herbivores and other predators. In describing ecosystems the trophic connections are often described as nodes linking species from one trophic level to another, and in most ecosystems it is... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2013 |
URL: http://orgprints.org/23251/3/23251.pdf |
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