Genetic linkage between melanism and winglessness in the ladybird beetle Adalia bipunctata
Lommen, S.T.E. ; Jong, P.W. de; Koops, K.G. ; Brakefield, P.M. - \ 2012
Genetica 140 (2012)4-6. - ISSN 0016-6707 - p. 229 - 233.
2-spot ladybird - phenotypic plasticity - thermal melanism - geographical variation - harmonia-axyridis - coleoptera - coccinellidae - consequences - polymorphism - evolution
We report a case of genetic linkage between the two major loci underlying different wing traits in the two-spot ladybird beetle, Adalia bipunctata (L.) (Coleoptera: Coccinellidae): melanism and winglessness. The loci are estimated to be 38.8 cM apart on one of the nine autosomes. This linkage is likely to facilitate the unravelling of the genetics of these traits. These traits are of interest in the context of the evolution of intraspecific morphological diversity, and for the application of ladybird beetles in biological control programs.
A steep cline in ladybird melanism has decayed over 25 years: a genetic response to climate change?
Brakefield, P.M. ; Jong, P.W. de - \ 2011
Heredity 107 (2011)6. - ISSN 0018-067X - p. 574 - 578.
adalia-bipunctata - 2-spot ladybird - phenology - temperature - netherlands - synchrony
A cline in the frequency of melanic morphs of the two-spot ladybird, Adalia bipunctata, was first surveyed in 1980 along a transect extending inland from the coast in the Netherlands. At that time, the frequency of melanics increased over some 40 km from 10% near the coast to nearly 60% inland. Additional surveys made in 1991 and 1995 demonstrated some progressive change in cline shape. New samples from 1998 and 2004 confirm these dynamics, and show that over a period of about 50 generations for the beetle, the cline had decayed rapidly to yield rather uniform frequencies of melanic morphs at around 20% along the whole transect by 2004. Climate data and evidence for thermal melanism in this species support our contention that these dynamics reflect a dramatic example of a rapid genetic response within populations to climate change and local selection. Heredity (2011) 107, 574-578; doi:10.1038/hdy.2011.49; published online 27 July 2011