A Further Study on the Effect of Interspecific Mating on the Fitness in a Pair of Sympatric Phytophagous Ladybirds
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概要
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As a supplement to a previous study by NAKANO (1985), the results of multiple-mating experiments involving both conspecific and interspecific combinations between H. vigintioctomaulata and H. pustulosa, a pair of closely related sympatric ladybirds, were presented. In one series, females were successively mated with conspecific males once and heterospecific males once ; after that these females were reared in pair with the heterospecific males. The fertilization ratios and the hatching ratios of eggs laid before the second (interspecific) matings were high but they significantly dropped during the pair rearing with the heterospecific males. In another series, females were first mated with heterospecific males once, and then mated with conspecific males once ; after that they were reared singly. In this series, the fertilization ratios and the hatching ratios in H. pustulosa females and the hatching ratios in H. vigintioctomaculata females before the second (conspecific) matings were significantly lower than those in once conspecifically mated females. Although these values considerably rose after the second (conspecific) matings they did not always reach the level attained by the females who had mated only once with conspecific males. On the basis of the present results and those given by NAKANO (1985), the relations among the number of matings, the degree of conspecific sperm precedence and the fitness of interspecifically mated individuals were discussed.
- 日本昆虫学会の論文
- 1986-06-25
著者
関連論文
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