Non-random mating in the two-spot ladybird (Adalia bipunctata): I. A reassessment of the evidence

Kearns, Peter; Tomlinson, Ian; O'Donald, Peter; Veltman, Clare J.

doi:10.1038/hdy.1990.91

Cited by 20 publications

(22 citation statements)

References 19 publications

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“…It has been suggested for A. bipunctata, that nonrandom mating is closely linked to mate choice by females (Muggleton, 1979;Majerus et a!., 1982a,b;Kearns et a!., 1990). In the present study, female mate choice is clearly implicated in the spring results of Experiments 1 and 2, where males of non-melanie succinea achieved a higher frequency of mating than other morphs.…”

Section: Discussionsupporting

confidence: 56%

“…Despite these earlier works, no detailed study has been undertaken to relate field observations on seasonal morph variation to mating behaviour, although the phenomenon of nonrandom mating is well known in A. bipunctata (cf. Muggleton, 1978Muggleton, , 1979Kearns et al, 1990). Because morph variations can be subtle, a clear pattern may not emerge from either field or laboratory investigations alone; a combination of the two is most desirable in this respect.…”

Section: Discussionmentioning

confidence: 99%

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Seasonal variation in elytral colour polymorphism in Harmonia axyridis (the ladybird beetle): the role of non-random mating

1992

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Seasonal variation in the frequency of elytral colour polymorphism in the ladybird beetle, Harmonia axyridis, was analysed through the combination of field observations and laboratory mate-choice experiments. Field observations involving daily mark-recapture of a local population revealed an overall preponderance of melanie morphs in the population, but the proportion of nonmelanics notably increased from spring to summer due to their higher frequency of mating among different morphs of the spring generation. In the laboratory experiments, both melanie and nonmelanic females preferentially chose non-melanic males in spring, but non-melanics were less successful at mating than melanics in summer. Therefore, the relative frequencies of melanics and non-melanics within a population vary throughout the seasons, with non-melanics increasing in proportion towards summer and decreasing thereafter. Laboratory experiments revealed that nonrandom mating among morphs is the basis of this variation, with females and, to a lesser degree, males being involved in the process of mate selection. The results of an artificial colour-change experiment indicate that male elytral colour is an important factor in female mate selection but other factors such as behaviour and chemical cues must also be involved.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Seasonal variation in elytral colour polymorphism in Harmonia axyridis (the ladybird beetle): the role of non-random mating

1992

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“…Our reassessment of the evidence for non-random mating in two-spot ladybird populations (Kearns et a!., 1990) showed, amongst other things, that there is variation among populations. Our studies here failed to demonstrate female preference for melanic males, in either the original or new laboratory lines; they also revealed the importance of experimental design when measuring non-random mating.…”

Section: Discussionmentioning

confidence: 99%

“…We have previously discussed the evidence for nonrandom mating between these morphs (Kearns et a!., 1990), in most populations, there is either random mating or a general mating advantage in favour of melanics of either sex. In one population, however, from Keele, Staffordshire, some 'choosy' females were shown to have a genetic mating preference for melanic males (Majerus et a!., 1982b).…”

Section: Introductionmentioning

confidence: 99%

Non-random mating in Adalia bipunctata (the two-spot ladybird). II. Further tests for female mating preference

et al. 1992

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Tests for non-random mating in laboratory stocks of Adalia bipunctata showed that female twospot 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.

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“…Field data have provided evidence for different forms of sexual selection as sociated with the different colour morphs: (i) a female preference for melanic males has been described in some British populations (Majerus et at., 1982;O'Donald & Majerus, 1988; but see Kearns et al, 1990Kearns et al, , 1992; (ii) a frequency-dependent mating advantage for melanics has been recorded (Muggleton, 1979;Kearns et at., 1990); (iii) a general mating advantage to melanics over non-melanics was found in The Netherlands (Brakefield,1 984c). An understanding of the extent of sperm competition in this species is necessary to interpret the consequences of any deviation from random mating.…”

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confidence: 99%

Sperm competition and melanic polymorphism in the 2-spot ladybird, Adalia bipunctata (Coleoptera, Coccinellidae)

1993

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Sperm precedence was investigated in the 2-spot ladybird, Ada/ia bipunctata by utilizing a di-allelic colour marker gene. Non-melanic (homozygous recessive) virgin females were mated once with a non-melanic male and after subsequent laying of fertile eggs they were mated with a melanic male of known genotype. Frequencies of colour morphs in the offspring provided evidence for almost complete second male sperm precedence, although the data from certain matings do not completely exclude the possibility of first male sperm precedence. The results are discussed in the light of the hypothesis of thermal melanism.

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Non-random mating in the two-spot ladybird (Adalia bipunctata): I. A reassessment of the evidence

Cited by 20 publications

References 19 publications

Seasonal variation in elytral colour polymorphism in Harmonia axyridis (the ladybird beetle): the role of non-random mating

Seasonal variation in elytral colour polymorphism in Harmonia axyridis (the ladybird beetle): the role of non-random mating

Non-random mating in Adalia bipunctata (the two-spot ladybird). II. Further tests for female mating preference

Sperm competition and melanic polymorphism in the 2-spot ladybird, Adalia bipunctata (Coleoptera, Coccinellidae)

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