Eur. J. Entomol. 113: 489-496, 2016 | 10.14411/eje.2016.064

Seasonal polyphenism in Eristalis pertinax (Diptera: Syrphidae)

Lukasz E. MIELCZAREK1, Andrzej OLEKSA2, Katarzyna MEYZA2, Adam TOFILSKI1,*
1 Department of Pomology and Apiculture, Agricultural University, 29 Listopada 54, 31-425 Krakow, Poland; e-mails: lukasz@insects.pl, rotofils@cyf-kr.edu.pl
2 Department of Genetics, Kazimierz Wielki University, Chodkiewicza 30, 85-064 Bydgoszcz, Poland; e-mails: olek@ukw.edu.pl, kasiakow@ukw.edu.pl

Eristalis pertinax varies seasonally, with the spring morph more hairy than the summer morph. We measured the size and the venation of the wings of the seasonal morphs. Wings of the spring morph were significantly larger than those of the summer morph and those of females were larger than those of males. There were also significant differences between the morphs in wing venation and their allometric relationship. The differences between sexes were larger than differences between seasonal morphs. The allometry can account for the sexual dimorphism but not seasonal dimorphism. The differences between seasonal morphs in wing shape were relatively large with very few intermediate individuals. The differences were comparable to those between two related species of Syrphidae. Genetic analyses based on markers in nuclear and mitochondrial genomes unequivocally revealed that spring and summer morphs of E. pertinax form a single population and should not be regarded as separate taxa. Thus seasonal variability in this species is a rare example of polyphenism in Diptera.

Keywords: Diptera, Syrphidae, Eristalis pertinax, seasonal polyphenism, wing venation, allometry

Received: April 13, 2016; Accepted: June 28, 2016; Published online: September 15, 2016

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