نتایج جستجو برای: hoverflies
تعداد نتایج: 225 فیلتر نتایج به سال:
We propose a conceptual model for pollination and fertilization of tomato flowers in greenhouses crops by hoverflies, when the maximal number adult pollinators maintained is less than what needed an economically successful greenhouses. The consists two-stage process additional feeding hoverfly to maintain pollinator density at desired level. First, with stochastic model, we calculate flies nece...
A list of 101 species hoverflies recorded from three high altitudinal belts in the Eastern Sayan mountain region is given. Most belong to subfamilies Syrphinae (60 species) and Eristalinae (38 species), while Pipizinae Microdontinae are presented by two one species, respectively. Totally, 96 were found forest zone, 37 tundra only Platycheirus chilosia has been caught golsty belt. New synonymy e...
Despite widespread concern about declines in pollination services, little is known about the patterns of change in most pollinator assemblages. By studying bee and hoverfly assemblages in Britain and the Netherlands, we found evidence of declines (pre-versus post-1980) in local bee diversity in both countries; however, divergent trends were observed in hoverflies. Depending on the assemblage an...
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