Sökning: "Hymenoptera"

Visar resultat 16 - 17 av 17 uppsatser innehållade ordet Hymenoptera.

1. 16. Hur har sandstäppsarealen på Öland förändrats mellan 1995 och 2009 och var finns möjliga restaureringsytor

   Magister-uppsats, Stockholms universitet/Institutionen för naturgeografi

   Författare :Jonas Lundquist; [2009]
   Nyckelord :sandstäpp; Öland;

   Sammanfattning : Xeric sand calcareous grasslands or sand steppe is a rare habitat type in Sweden. In our country the occurrence of sand steppe is limited to eastern Scania and a few sites on the Baltic island of Öland. The availability of calcareous sand and a continuous management of the soil surface regulate formation of the sand steppe. LÄS MER

3. 17. Flower attractiveness and nectar accessibility for Delia radicum (Diptera:Anthomyiidae) with implications for the control by Trybliographa rapae (Hymenoptera:Figitidae)

   L3-uppsats, SLU/Dept. of Plant Protection Biology

   Författare :Linda-Marie Rännbäck; [2008]
   Nyckelord :conservation biological control; flower attractiveness; nectar accessibility; Delia radicum; Trybliographa rapae; Hymenoptera; parasitoid wasps; flower strips; selective biodiversity; floral food sources; Lobularia maritima; Anethum graveolens; Fagopyrum esculentum; olfactometer; volatile collection; GC-MS;

   Sammanfattning : Conservation biological control aims at preserving populations of natural enemies in and around crop fields. Resources of floral nectar are important to natural enemies to increase the longevity, fecundity and motivation to seek host insects. LÄS MER