Biological invasions have the capacity to introduce non-native parasites. This study aimed to determine whether the invasive green crab population, Carcinus spp., on the Southwestern Atlantic coast of Argentina harbours any symbionts, and whether these may spillover or spillback between native crabs, Cyrtograpsus altimanus and C. angulatus. Macroscopy, histology, and molecular analyses of some parasites were used to describe and compare their diversity across the three species of crab. We also evaluated the susceptibility of invasive Carcinus spp. to a native digenean, Maritrema madrynense, via experimental infections (exposure and cohabitation).

Our results revealed that the green crab pathobiome included similar symbiotic groups to native crabs. This included putative viral, bacterial, and protozoan parasites. Haplosporidium-like observations were recorded in all crab species, and a single green crab was found to be parasitized by an Agmasoma-like microsporidium. Metagenomic analysis of one individual revealed additional symbiotic diversity (46 bacteria, 5 eukaryotic species). The green crabs were infected by more microparasite taxa than the native crabs (5:3). Wild populations of Carcinus spp. were free of metazoan parasites and are shown not to be susceptible to M. madryense under experimental conditions.

Our results suggest a reduction/escape of macroparasites (trematode Maritrema madrynense; acanthocephalan Profilicollis chasmagnathi) in invasive Carcinus spp. compared to their native competitors.

生物入侵有能力引入非本地寄生虫。本研究旨在确定入侵的绿蟹种群Carcinus spp. ，在阿根廷西南大西洋沿岸有任何共生体，以及这些共生体是否会在本地螃蟹、Cyrtograpsus altimanus和C. angulatus之间溢出或溢出。一些寄生虫的肉眼观察、组织学和分子分析被用来描述和比较三种螃蟹的多样性。我们还评估了侵袭性Carcinus spp的易感性。通过实验性感染（暴露和同居）传播给当地的 digenean，Maritrema madrynense。

我们的结果表明，绿蟹的致病菌群包括与本地螃蟹相似的共生群。这包括假定的病毒、细菌和原生动物寄生虫。在所有螃蟹物种中都记录了类似Haplosporidium的观察结果，并且发现一只绿色螃蟹被一种类似 Agmasoma的微孢子虫寄生。对一个个体的宏基因组分析揭示了额外的共生多样性（46 种细菌，5 种真核生物）。与本地螃蟹相比，绿蟹感染了更多的微寄生虫类群 (5:3)。Carcinus spp 的野生种群。没有后生动物寄生虫，并且在实验条件下显示对M. madryense不敏感。

我们的结果表明大寄生物的还原/逃逸（吸虫; Maritrema madrynense棘Profilicollis chasmagnathi在侵入性）滨蟹属属。与他们的本土竞争对手相比。