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Background  Ectoparasitic infections are of particular interest for endangered wildlife, as ectoparasites are potential vectors for inter- and intraspecific pathogen transmission and may be indicators to assess the health status of endangered populations. Here, ectoparasite dynamics in sympatric populations of two Malagasy mouse lemur species,  Microcebus murinus  and  M. ravelobensis , were investigated over an 11-month period. Furthermore, the animals’ body mass was determined as an indicator of body condition, reflecting seasonal and environmental challenges. Living in sympatry, the two study species experience the same environmental conditions, but show distinct differences in socioecology:  Microcebus murinus  sleeps in tree holes, either solitarily (males) or sometimes in groups (females only), whereas  M. ravelobensis  sleeps in mixed-sex groups in more open vegetation.    Results  Both mouse lemur species hosted ticks ( Haemaphysalis  sp.), lice ( Lemurpediculus  sp.) and mites ( Trombiculidae  gen. sp. and  Laelaptidae  gen. sp.). Host species, as well as temporal variations (month and year), were identified as the main factors influencing infestation. Tick infestation peaked in the late dry season and was significantly more often observed in  M. murinus  ( P  = 0.011), while lice infestation was more likely in  M. ravelobensis  ( P  < 0.001) and showed a continuous increase over the course of the dry season. Genetic analyses identified  Lemurpediculus  sp. infesting both mouse lemur species. Ticks morphologically conform to  H. lemuris , but genetic analysis showed a clear differentiation of the specimens collected in this study, suggesting a potentially new tick species. Host body mass decreased from the early to the late dry season, indicating nutritional stress during this period, which may render individuals more susceptible to parasitic infections.    Conclusions  Seasonal differences and species-specific variations in sleeping site ecology in terms of sleeping site type and sociality were determined as key factors influencing ectoparasitism in  M. murinus  and  M. ravelobensis.  This needs to be taken into account when evaluating ectoparasite infestations at a given time point. The detection of the same parasite species on two closely related and sympatric host species furthermore indicates a potential pathway for disease transmission, not only within but also between lemur species.    Electronic supplementary material  The online version of this article (10.1186/s13071-018-3034-y) contains supplementary material, which is available to authorized users.

parasites and vectors

Ectoparasite communities of small-bodied Malagasy primates: seasonal and socioecological influences on tick, mite and lice infestation of Microcebus murinus and M. ravelobensis in northwestern Madagascar