In this study we present the results from field work in northern Vietnam regarding the occurrence of the warty newt species Paramesotriton deloustali and P. guangxiensis in disturbed and undisturbed habitats and the presence of parasitic water mites of the genus Hygrobates (sg. Lurchibates) (Acari, Hydrachnidia). We report the first evidence of mite parasitism in P. guangxiensis and analyze differences in the infestation rates between both Paramesotriton species and habitat qualities. Furthermore we present the first indication of the detrimental effects of these parasite-host interactions.

Our preliminary assessment seems to support the sensitivity of P. guangxiensis to habitat disturbances, as the average number of captured newts per stream was twice as high in undisturbed habitats as in disturbed ones.

Until now a very specific parasite-host association was supposed between water mite and newt species. However, our results show the first evidence of a water mite species of the subgenus Lurchibates (Hygrobates forcipifer) parasitizing more than one host species, in this case not only P. deloustali (already known) but also P. guangxiensis (new record). The overall infestation rate was 27 % for P. deloustali and 71 % for P. guangxiensis, from which 100 % and 77 % of the mite-incidence occurred in undisturbed habitats, respectively. Furthermore the parasite load of the newts was clearly higher in prime quality streams: the parasite load in undisturbed habitats was very similar between P. deloustali (19.64 mites per newt) and P. guangxiensis (20.13 mites per newt), however it was significantly lower for P. guangxiensis in disturbed habitats (8.86 mites per newt). Future research should bring more detail on these parasite host associations, especially on the effect of parasitism on the newts. Warty newts are already threatened due to their shrinking natural habitat and overharvesting. We report the first concerns that mite parasitism might be a critical additional stress factor in undisturbed habitats.

在这项研究中，我们介绍了越南北部野外调查结果，这些结果是在受干扰和未受干扰的栖息地中出现了疣状new物种Paramesotriton deloustali和P. guangxiensis，以及杂草属（如Lurchibates）（Acari）的寄生水螨的存在。，Hydrachnidia）。我们报告了广西疟原虫螨寄生的第一个证据，并分析了副甲虫和栖息地质量之间的侵染率差异。此外，我们提出了这些寄生虫-宿主相互作用的有害影响的第一个迹象。

我们的初步评估似乎支持了广西疟原虫对栖息地干扰的敏感性，因为在不受干扰的栖息地中，每条河流捕获的new的平均数量是受干扰栖息地的两倍。

直到现在，水螨和new物种之间还存在着非常特殊的寄生虫-宿主关联。然而，我们的结果表明，Lurchibates（Hygrobates forcipifer）属的一种水螨物种寄生了一种以上的寄主物种，在这种情况下，不仅是P. deloustali（已为人所知），而且还有P. guangxiensis（新记录）。念珠对虾的整体侵染率为27％，广西对虾的总体侵染率为71％。，其中100％和77％的螨虫发生率分别发生在未受干扰的栖息地中。此外，优质水流中the的寄生虫负载明显更高：未受干扰的生境中的寄生虫负载在德氏疟原虫（每只t19.64螨）和广西疟原虫（每2020.13螨）之间非常相似，但显着较低。为P.青梅在受干扰的栖息地（每new 8.86螨）。未来的研究应该对这些寄生虫寄主的联系，尤其是寄生虫对the的影响进行更多的研究。疣状new由于其自然栖息地的缩小和过度采伐而已受到威胁。我们报告的第一个担忧是，螨虫寄生可能是未受干扰的栖息地中一个至关重要的附加压力因素。