apidae 1 bestuivers (dieren) 1 bestuiving 1 betuwe 1 bomen 1 boomgaarden 1 bosschade 1 cerambycidae 1 duingebieden 1 duneland 1 forest damage 1 habitats 1 honey bees 1 honingbijen 1 insect plant relations 1 insect-plant relaties 1 insecten 1 insects 1 kennemerland 1 malus 1 noord-holland 1 orchards 1 pollination 1 pollinators 1 pyrus 1 trees 1 wild honey bee colonies 1 wilde bijenvolken 1 zoogeography 1 zoögeografie 1