Trypanosoma cruzi reservoir-triatomine vector co-occurrence networks reveal meta-community effects by synanthropic mammals on geographic dispersal

PeerJ. 2017 Apr 12:5:e3152. doi: 10.7717/peerj.3152. eCollection 2017.

Abstract

Contemporary patterns of land use and global climate change are modifying regional pools of parasite host species. The impact of host community changes on human disease risk, however, is difficult to assess due to a lack of information about zoonotic parasite host assemblages. We have used a recently developed method to infer parasite-host interactions for Chagas Disease (CD) from vector-host co-occurrence networks. Vector-host networks were constructed to analyze topological characteristics of the network and ecological traits of species' nodes, which could provide information regarding parasite regional dispersal in Mexico. Twenty-eight triatomine species (vectors) and 396 mammal species (potential hosts) were included using a data-mining approach to develop models to infer most-likely interactions. The final network contained 1,576 links which were analyzed to calculate centrality, connectivity, and modularity. The model predicted links of independently registered Trypanosoma cruzi hosts, which correlated with the degree of parasite-vector co-occurrence. Wiring patterns differed according to node location, while edge density was greater in Neotropical as compared to Nearctic regions. Vectors with greatest public health importance (i.e., Triatoma dimidiata, T. barberi, T. pallidipennis, T. longipennis, etc), did not have stronger links with particular host species, although they had a greater frequency of significant links. In contrast, hosts classified as important based on network properties were synanthropic mammals. The latter were the most common parasite hosts and are likely bridge species between these communities, thereby integrating meta-community scenarios beneficial for long-range parasite dispersal. This was particularly true for rodents, >50% of species are synanthropic and more than 20% have been identified as T. cruzi hosts. In addition to predicting potential host species using the co-occurrence networks, they reveal regions with greater expected parasite mobility. The Neotropical region, which includes the Mexican south and southeast, and the Transvolcanic belt, had greatest potential active T. cruzi dispersal, as well as greatest edge density. This information could be directly applied for stratification of transmission risk and to design and analyze human-infected vector contact intervention efficacy.

Keywords: Chagas disease; Co-occurrence; Complex networks; Data-mining; Mexico; Triatominae; Vector-host interactions; Zoonotic disease.

Associated data

  • Dryad/10.5061/dryad.rq120

Grants and funding

Carlos N. Ibarra-Cerdeña CNIC was funded with a graduate scholarship from CONACYT (Consejo Nacional de Ciencia y Tecnología) for his PhD studies in the Biomedical Sciences Program of the UNAM (Universidad Nacional Autónoma de Mexico), fulfilled in part by this study. Janine Ramsey was funded by CONACyT FONSEC 161405 and CONACyT SEP 166828. Víctor Sánchez-Cordero was funded by PAPIIT-UNAM IN209314, Christopher R. Stephens was funded by PAPIIT-UNAM IN113414 y CONACyT Fronteras grant FC-2015-2/1093. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.