Biological invasions are a growing threat to global biodiversity due to negative impacts on native biota and ecosystem functioning. Research has expanded from investigating native and alien species interactions to examining relationships among alien species. Invasive crayfish may have similar life histories, niche preferences, and adaptation strategies, but their mutual interactions are little understood. This study aimed to quantify interaction patterns of size-matched calico crayfish Faxonius immunis, established in the Rhine River catchment, and the parthenogenetic marbled crayfish Procambarus virginalis, currently spreading throughout Europe. During agonistic interactions in the absence of shelter, marbled crayfish won a significant majority of fights against calico crayfish, but in the presence of shelter there was no significant difference. When sex of calico crayfish was considered in the analysis without shelter, marbled crayfish won a significantly higher number of fights with female calico crayfish. In the absence of shelter, marbled crayfish dominated calico crayfish females in 83.3% and males in 60% of pairs. With available shelter, the dominance of marbled crayfish was 100% and 54.5% over female and male calico crayfish, respectively. The results suggested that sex and resource availability influence agonistic behaviour in the studied crayfish. Marbled crayfish are confirmed to be competitive against the calico crayfish, which has been shown to be dominant over another serious invader in the Rhine River catchment, the spiny-cheek crayfish Faxonius limosus. In natural sympatric populations, the situation may be affected by factors such as size, reproductive variables, water temperature, and predation pressure.

中文翻译：

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大理石纹小龙虾维加原螯虾替代入侵性Faxonius免疫的潜力

由于对原生生物群和生态系统功能的负面影响，生物入侵正在对全球生物多样性构成越来越大的威胁。研究已经从调查本地和外来物种之间的相互作用扩展到研究外来物种之间的关系。侵袭性小龙虾可能具有相似的生活史，利基偏好和适应策略，但它们之间的相互作用却鲜为人知。这项研究的目的是量化在莱茵河流域建立的大小匹配的印花小龙虾Faxonius immunis和孤雌性大理石纹小龙虾Procambarus virginalis的相互作用模式。，目前遍布整个欧洲。在没有避难所的情况下进行的激动互动中，大理石纹小龙虾赢得了与印花布小龙虾的大部分抗争，但在有避难所的情况下却没有显着差异。如果在没有庇护所的情况下考虑印花布小龙虾的性别，则大理石纹小龙虾与雌性印花布小龙虾的搏斗次数要多得多。在没有庇护所的情况下，成对的小龙虾以斑ico小龙虾中的雌性占83.3％，雄性中占60％。在有庇护所的情况下，大理石小龙虾比雌性和雄性印花布小龙虾的优势分别为100％和54.5％。结果表明性别和资源的可获得性影响所研究的小龙虾的激动行为。已确认大理石纹小龙虾对印花布小龙虾具有竞争力，Faxonius limosus。在自然同胞种群中，情况可能受到大小，繁殖变量，水温和捕食压力等因素的影响。