Elytra colour polymorphism and randomness of matings in Chauliognathus fallax Germar 1824 from southern Brazil (Coleoptera, Cantharidae)
Rev. bras. entomol
;
47(3): 409-413, 2003. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-388949
RESUMO
Beetles of the species Chauliognathus fallax Germar 1824 are polymorphic for elytron colouration with six morphs distinguished on the basis of black pigmentation on a yellow background. We investigated samples of C. fallax taken in eight consecutive weeks aiming to determine the frequency of the morphs which were grouped, for statistical analysis, into three classes according to elytra pigmentation as well as the possible occurrence of assortative mating. Our results showed a variation in the frequency of the classes throughout the season, both in males and females, with the maximum frequency of each class at the fourth and fifth week. The three classes (A, B, C) showed the same pattern of variation, and class B was always the more frequent. To test randomness of matings two approaches were taken in the first, we compared the frequency of each class in copulating and non-copulating insects. In the second, the frequency of each class in the whole sample was taken as the probability of occurrence of the respective class; then, using the criterion of the probability of independent events we calculated the expected proportion of copulating insects for each pair of events. Both methods gave non-significant differences, suggesting that the matings were random.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Polimorfismo Genético
/
Besouros
/
Brasil
/
Pigmentação
Tipo de estudo:
Ensaio Clínico Controlado
País/Região como assunto:
América do Sul
/
Brasil
Idioma:
Inglês
Revista:
Rev. bras. entomol
Assunto da revista:
Biologia
Ano de publicação:
2003
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Federal do Rio Grande do Sul/BR
/
Universidade do Vale do Rio dos Sinos/BR
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