Summary 1.We know that sexually transmitted parasites and pathogens have extremely deleterious effects in human and domesticated animal populations, but know little of sexually transmitted diseases (STDs) in natural populations. 2. One previously reported natural system is the sexually transmitted mite, Coccipolipus hippodamiae , on the eastern European coccinellid, Adalia bipunctata . Our aims were to determine how widespread this parasite is in terms of incidence and prevalence across host species, to identify the causes of the prevalence pattern and whether the parasite reduces fertility in all host species. 3. Coccipolipus hippodamiae was present on four of 19 European species examined. The wide distribution and high prevalence of C. hippodamiae on A. bipunctata indicates that this is the major host. The mite was also present at substantial prevalence on Adalia decempunctata and at lower prevalence on Synharmonia (= Oenopia ) conglobata and Calvia quatuordecimguttata . 4. Laboratory studies on mite development time and transmission efficiency revealed that although physiological factors may affect incidence, they do not explain prevalence variation between hosts, but characteristics of host life history and reproductive behaviour are important in this context. Adalia bipunctata is more promiscuous than the less commonly infected A. decempunctata and S. conglobata . Diapause is needed before breeding will occur in C. quatuordecimguttata , leading to a lack of the consistent sexual activity between generations, which is needed for STD maintenance. Calvia quatuordecimguttata is probably periodically reinfected through hybrid matings with other host species. 5. Coccipolipus hippodamiae infection has similar strong deleterious effects on female reproduction in A. decempunctata and S. conglobata as have previously been demonstrated in A. bipunctata . 6. The results indicate that STDs may play a profound role in the ecology of promiscuous insect populations with overlapping generations. Here they may reach significant prevalence whilst exhibiting extreme virulence.

No abstract

No abstract

-

Four new genera of Podapolipidae (Acarina) are described. They are all parasites of beetles and cockroaches in Southeast Asia and the East Indies: Panesthipolipus from Panesthia angustipennis (Blaberidae), Peripolipus from Periplaneta spp. (Blattidae), Dilopolipus from Dilochrosis sp. (Scarabaeidae) and Stenopolipus from Catharsius sp. (Scarabaeidae). Keys to the 19 genera of Podapolipidae are presented. Distribution of the following species are reported from the Indo-Australian Region: Archipolipus canthoni, Bakerpolipus serratus, Coccipolipus macfarlanei, Dilopolipus leei n. sp., Locustacarus trachealis, L. masoni, Panesthipolipus oudemansi n. comb., Peripolipus muraii n. sp., Podapolipoides spp., Stenopolipus langi n. comb., S. sinensis n. sp., Tetrapolipus batocerae, T. hunteri and T. lundi.

No abstract

No abstract

No abstract