Cookies on this website

We use cookies to ensure that we give you the best experience on our website. If you click 'Accept all cookies' we'll assume that you are happy to receive all cookies and you won't see this message again. If you click 'Reject all non-essential cookies' only necessary cookies providing core functionality such as security, network management, and accessibility will be enabled. Click 'Find out more' for information on how to change your cookie settings.

Tests for non-random mating in laboratory stocks of Adalia bipunctata showed that female two- spot ladybirds from ‘isofemale lines’, which had formerly mated preferentially with melanic males, now mated at random. In an attempt to obtain new stocks in which females mated preferentially, we isolated ‘isofemale lines’ from a natural population at Keele, but we found no evidence of females mating preferentially within these stocks. We did, however, observe two interesting phenomena, not previously reported from Keele populations of Adalia bipunctata, or from laboratory stocks derived from the Keele population. Firstly, much of the variation in male mating success, which we observed, could be explained by the date on which the mating tests were carried out. Secondly, there was significant heterogeneity in sex ratios among some of the stocks. We discuss the potential importance of both these phenomena when designing experiments and interpreting data regarding non-random mating in Adalia bipunctata. © 1992 The Genetical Society of Great Britain.

Original publication




Journal article



Publication Date





385 - 389