Search results for "Nymphaeaceae"
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Breeding system and pollination of Nuphar luteum (L.) Smith (Nymphaeaceae) in Norway
1995
Summary Insects visiting Nuphar luteum in southern Norway were caught and identified and their role as pollinators was evaluated by observations of their behaviour. Nuphar luteum is mainly pollinated by Apis mellifera and Bombus spp. Moreover syrphid flies are efficient pollinators. The chrysomelid beetle Donacia crassipes , although sometimes present, plays but a minor role as pollinator. By bagging and emasculating flowers the breeding system was shown to be one of mixed mating. Nuphar luteum is protogynous and primarily cross-pollinated, but because male and female stages overlap during the second day of flowering, and because it is self-compatible, self-fertilization is possible. Agamos…
Egg and larval load assessment and its influence on oviposition behaviour of the leaf beetle Galerucella nymphaeae
1993
The oviposition behaviour of the water-lily beetle Galerucella nymphaeae was examined. This species is a specialist herbivore on the floating leaves of nymphaeids Nymphaeaceae and especially on the yellow water-lily, Nuphar lutea. Females lay their eggs in clutches on the leaves, and after hatching, the larvae feed on the leaves. The quality of the leaves decreases quickly after the larvae hatch, and eventually the leaves will sink below the water surface, whereupon the eggs, 1st-instar larvae and pupae are killed by drowning. The influence of conspecific eggs, larvae and feeding tracks on the oviposition preferences of the beetles was tested. Females were allowed to choose between fresh le…