Sown weed strips in cereal fields: overwintering site and “source” habitat for Oedothorax apicatus (Blackwall) and Erigone atra (Blackwall) (Araneae: Erigonidae)
2002; Elsevier BV; Volume: 90; Issue: 1 Linguagem: Inglês
10.1016/s0167-8809(01)00173-6
ISSN1873-2305
AutoresAntje B. Lemke, Hans‐Michael Poehling,
Tópico(s)Insect and Pesticide Research
ResumoThe function of within-field habitats as refuge and overwintering sites for spiders and their effect on field invasion by spiders in spring were investigated from 1994 to 1996. Weed strips were established in a field of winter wheat in northern Germany in the spring of 1994. Spiders were sampled with pitfall traps and D-vac suction sampling throughout the year. Experiments showed that weed strips can play an important role as overwintering habitats for common spider species of arable land. Spring emigration from the weed strips into the crop was especially recorded for Oedothorax apicatus (Blackwall) (Araneae: Erigonidae), a species which depends on semi-natural habitats for overwintering. The results indicate that for species with a high potential for aerial dispersal like Erigone atra (Blackwall) (Araneae: Erigonidae), the proximity of refuge habitats is less important than for species that disperse predominantly over the soil surface like O. apicatus. The function of weed strips for spider populations in the agricultural landscape is discussed.
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