Vol. 50 No. 1, 2011
Evidence of Female Preference for Older Males in Drosophila bipectinata
Somashekar and Mysore Siddaiah Krishna*
Stock Center, Department of Studies in Zoology, University of Mysore,
Manasagangotri, Mysore 570006, Karnataka State, India
Krishnashetty Somashekar and Mysore
Siddaiah Krishna (2011) Male age influence on mating success was
studied using 3 geographic strains of Drosophila
bipectinata. When investigating 3 age classes of males, it was
noted that females preferred to mate with the older of 2 males more
frequently than with the younger one. A non-significant difference was
also noted in the mean wing length between the selected and rejected
males by females in a female-choice experiment. Old males mated faster,
copulated longer, and inseminated more females in a given unit of time
than did young or intermediate-aged males. Furthermore, females mated
with older males had shorter lifespan compared to females mated with
young and intermediate-aged males. These studies suggest that
irrespective of geographic strain, D.
bipectinata females prefer to mate with older males, and the
older of the 2 competing males had a greater mating advantage in terms
of inter-male success, mated faster, and inseminating more females in a
given unit of time compared to young and intermediate-aged males.
Females mating with older males lived a shorter time than females
mating with young and intermediate-aged males.
Key words: Drosophila bipectinata, Female
preference, Wing length, Male age.