نتایج جستجو برای: flower flies
تعداد نتایج: 36322 فیلتر نتایج به سال:
abstract the syrphidae family (known as hover flies or flower flies) is one of the largest families of diptera with almost 6000 species. adult flies feed on nectar and pollen of flowers and they are crucial agent in pollinating process. the larvae of many species of syrphidae are predators of aphids and play an important role in biological control of pests. in the following faunestic investigat...
Introduction: Flies are able to mechanically transmit many pathogenic agents due to their close relationship with humans. Identification and species determination of flies for understanding of their current status and planning for their control, as well as considering the important role of flies in the ecosystem and their biological functions in biological studies, is essential. The purpose of ...
Flower visiting Eristalis hoverflies feed on nectar and pollen and are known to rely on innate colour preferences. In addition to a preference for visiting yellow flowers, the flies possess an innate proboscis reflex elicited by chemical as well as yellow colour stimuli. In this study we show that the flies' proboscis reflex is only triggered by yellow colour stimuli and not altered by conditio...
Cases of imperfect or non-model mimicry are common in plants and animals and challenge intuitive assumptions about the nature of directional selection on mimics. Many non-rewarding flower species do not mimic a particular species, but attract pollinators through ‘generalised food deception’. Some predatory animals also attract pollinators by resembling flowers, perhaps the most well known, yet ...
Diversity of flower traits is often proposed as the outcome of selection exerted by pollinators. Positive directional pollinator-mediated selection on floral size has been widely shown to reduce phenotypic variance. However, the underlying mechanism of maintaining within-population floral color polymorphism is poorly understood. Divergent selection, mediated by different pollinators or by both ...
The causes and consequences of flower constancy have been the focus of many studies, but almost all have examined the foraging behavior of bumblebees, honeybees, or butterflies. We test whether constancy occurs in an overlooked group of pollinators, the syrphid flies. Foraging sequences of wild flies of two species, Episyrphus balteatus and Syrphus ribesii, were examined when visiting flowers i...
Bombyliidae (5000 sp.), or bee flies, are a lower brachyceran family of flower-visiting flies that, as larvae, act as parasitoids of other insects. The evolutionary relationships are known from a morphological analysis that yielded minimal support for higher-level groupings. We use the protein-coding gene CAD and 28S rDNA to determine phylogeny and to test the monophyly of existing subfamilies,...
The genus Heringina Aczél, 1940 is revised and shown to belong to the Tephritis group of genera and is closely related to Tephritis and Multireticula. Literature records are revised, and available collection material is listed. The genus includes two species: H. guttata (Fallén 1814) originally described from the sand dunes of southern Sweden and occurring from the Baltic region through Ukraine...
A new species, Thismiahongkongensis S.S.Mar & R.M.K.Saunders, is described from Hong Kong. It is most closely related to Thismiabrunonis Griff. from Myanmar, but differs in the number of flowers per inflorescence, the colour of the perianth tube, the length of the filaments, and the shape of the stigma lobes. We also provide inferences on the pollination ecology and seed dispersal of the new sp...
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