Seasonal pattern of flower utilization in hoverflies (Diptera: Syrohidae) in Kagawa Prefecture, Japan.
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Accession number;00A0428647
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| Title;Seasonal pattern of flower utilization in hoverflies (Diptera: Syrohidae) in Kagawa Prefecture, Japan. |
| Author;
TAI KEN'ICHIRO
(Fac. of Agric., Kagawa Univ.)
ICHINO TAKAO
(Fac. of Agric., Kagawa Univ.)
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Journal Title;Technical Bulletin of Faculty of Agriculture, Kagawa University
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Journal Code:G0765A
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ISSN:0368-5128
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VOL.52;NO.;PAGE.71-77(2000)
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| Figure&Table&Reference;FIG.3, TBL.1, REF.3 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;A periodical field sampling of hoverflies and other flower-visiting insects was carried out in 1997 at a secondary oak forest in Kagawa, South Japan. A total of 247 individuals of 22 syrphid species were collected from mid May to mid November. The syrphid fauna was characterized by the dominance of genus Epistrophe. The seasonal population fluctuation in syrphids was affected by flowering phenology of plants, having two peaks in spring and autumn. The primary resource flowers for syrphids were Deutzia sieboldina and Erigeron annuls in spring, and Aster yomena and Aster ageratoides in autumn. Most of the syrphid species tended to visit flowers with open nectar or very short tubes and become the dominate visitors there although some small-sized hoverflies visited and crawled into deep flowers. In less abundant but preferred plant species, large-sized hoverflies monopolized while small-sized ones were dominant on abundant plants. This may be interpreted as a consequence of interspecific competition for flower resources. (author abst.) |
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