Bacterial Infections of Hemocytes Associated with the Maternally Inherited Male-Killing Trait in British Populations of the Two Spot Ladybird,Adalia bipunctata

Hurst, Gregory D. D.; Walker, Linda E.; Majerus, Michael E. N.

doi:10.1006/jipa.1996.0098

Cited by 25 publications

(12 citation statements)

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“…Because infectious transmission between arthropod hosts is thought to be rare, the general view is that exclusively arthropod Rickettsia are maintained within a host species primarily by transovarial transmission, and therefore must enhance the fitness of infected females [ 64 ]. Some Rickettsia raise infected female fitness in an indirect way by manipulating host reproduction towards infected daughters at the expense of sons, either by killing male offspring as embryos (male-killing) or by inducing parthenogenesis [ 13 , 65 ]. The closely related bacterium O. tsutsugamushi also causes a female biased sex ratio in its mite host [ 66 ].…”

Section: Discussionmentioning

confidence: 99%

Evolution and diversity of Rickettsiabacteria

et al. 2009

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Background: Rickettsia are intracellular symbionts of eukaryotes that are best known for infecting and causing serious diseases in humans and other mammals. All known vertebrate-associated Rickettsia are vectored by arthropods as part of their life-cycle, and many other Rickettsia are found exclusively in arthropods with no known secondary host. However, little is known about the biology of these latter strains. Here, we have identified 20 new strains of Rickettsia from arthropods, and constructed a multi-gene phylogeny of the entire genus which includes these new strains.

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Section: Discussionmentioning

confidence: 99%

Evolution and diversity of Rickettsiabacteria

et al. 2009

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“…In previous studies, ladybird male-killers were identified by detecting skewed offspring sex ratios and then testing for the presence of bacteria ( Hurst et al . 1996 ).…”

Section: Introductionmentioning

confidence: 99%

Are we underestimating the diversity and incidence of insect bacterial symbionts? A case study in ladybird beetles

et al. 2007

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Vertically transmitted bacterial symbionts are common in arthropods. However, estimates of their incidence and diversity are based on studies that test for a single bacterial genus and often only include small samples of each host species. Focussing on ladybird beetles, we collected large samples from 21 species and tested them for four different bacterial symbionts. Over half the species were infected, and there were often multiple symbionts in the same population. In most cases, more females than males were infected, suggesting that the symbionts may be sex ratio distorters. Many of these infections would have been missed in previous studies as they only infect a small proportion of the population. Furthermore, 11 out of the 17 symbionts discovered by us were either in the genus Rickettsia or Spiroplasma, which are rarely sampled. Our results suggest that the true incidence and diversity of bacterial symbionts in insects may be far greater than previously thought.

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“…To further corroborate the association between bacterial presence and male‐killing, blood smears, from ladybirds of differing sex‐ratio status, and stained with DAPI ( Hurst et al ., 1996 ), were examined microscopically. Examination of smears showed the presence of bacteria in lymph and haemocytes of SR and iSR, but not N, individuals.…”

Section: Resultsmentioning

confidence: 99%