期刊
JOURNAL OF EVOLUTIONARY BIOLOGY
卷 24, 期 10, 页码 2164-2172出版社
WILEY
DOI: 10.1111/j.1420-9101.2011.02346.x
关键词
Coccinellidae; endosymbionts; fitness compensation; indirect fitness benefits; male-killing bacteria; resource reallocation; sibling egg cannibalism
Male-killing bacteria are thought to persist in host populations by vertical transmission and conferring direct and/or indirect fitness benefits to their hosts. Here, we test the role of indirect fitness benefits accrued from resource reallocation in species that engage in sibling egg cannibalism. We found that a single-egg meal significantly increased larval survival in 12 ladybird species, but the value of an egg (to survival) differed substantially between species. Next, we tested the impact of three male-killing bacteria on larval survival in one ladybird species, Adalia bipunctata. Spiroplasma reduced larval survival, whereas Wolbachia and Rickettsia had no effect. However, Spiroplasma-infected larvae showed the greatest response to a single-egg meal. The indirect fitness benefit obtained from a single egg is thus so large that even male-killing bacteria with direct fitness costs can persist in host populations. This study supports the hypothesis that fitness compensation via resource reallocation can explain male-killing bacteria persistence.
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