Adaptation of native syrphid flies to new exotic plant (Impatiens spp.)-aphidant associations in Central Europe (Dipt., Syrphidae; Hom., Aphididae; Hym., Formicidae) |
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| Authors: | P Stary and P Láska |
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| Institution: | (1) Present address: Institute of Entomology, Academy of Sciences of the Czech republic, Branišovská 31, 370 05 České Budějovice, Czech republic;(2) Present address: Kosmonautů 14, 77 00 Olomouc, Czech republic |
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| Abstract: | Impatiens parviflora andI. glandulifera, two invasive touchme-not species of exotic origin were found to be associated with two aphid groups in Central Europe: a)
Exotic species subsequently following their invasive plant hosts (Impatientinum asiaticum
Nevsky), b) native species secondarily adapted to the new exotic hosts (Aphis fabae cirsiiacanthoidis
Scop.). The species number (listed) of associated syrphid flies in the newly developed guilds was rather high, consisting of broadly
oligophagous species. The plant phenology and adaptation of the aphids have resulted in associations which apparently represent
seasonally significant sources of prey, their importance apparently increasing with the decreasing season. Antattendance was
determined in both aphid species, and no adverse interference with the preying syrphid larvae was observed. In spite of an
overall classification of the target plants as expansive weeds, they are classified positively as contributing to the enhancement
of syrphid fly populations in the biocorridors in the cultivated landscape. |
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