Virome of Australia’s most endangered parrot in captivity evidenced of harboring hitherto unknown viruses

Abstract

ABSTRACT The detection of emerging infectious diseases (EIDs) within endangered animal populations is increasing rapidly because of many factors, such as anthropogenic influences and climate change. Their impacts can be extensive and may further contribute to the processes risking the threat of extinction of these species. EIDs may be caused by a range of pathogens, including viruses, bacteria, parasites, and fungi. However, detection and diagnosis can be challenging with limited knowledge of existing pathogens in endangered wildlife. The critically endangered orange-bellied parrot (OBP, Neophema chrysogaster ), with as few as 70 wild individuals, is a species at risk of extinctions, yet little research has been conducted into their existing viral diversity (virome). To determine the virome in a subset of the captive OBP population, this study characterized the fecal virome using a viral metagenomic approach. Analysis of the generated sequence data sets identified 11 viruses belonging to the families Adenoviridae , Circoviridae , Parvoviridae , and Picornaviridae . Strikingly, eight viruses were detected in the OBPs housed in Aviary 1 compared to only three viruses in OBPs housed at Aviary 2. In addition to detecting six novel viruses, this study also demonstrated ongoing infection with psittacine siadenovirus F. This study highlights the need to broaden this research to other populations of this species. Further virome characterization of co-habiting birds could also identify potential novel viruses and provide insight into their evolutionary relationship. These findings may contribute to strategic management and biosecurity plans for the conservation of endangered parrots. IMPORTANCE The impact of circulating viruses on the critically endangered, orange-bellied parrot (OBP) population can be devastating. The OBP already faces numerous threats to its survival in the wild, including habitat loss, predation, and small population impacts. Conservation of the wild OBP population is heavily reliant on supplementation using OBPs from a managed captive breeding program. These birds may act as a source for introduction of a novel disease agent to the wild population that may affect survival and reproduction. It is, therefore, essential to monitor and assess the health of OBPs and take appropriate measures to prevent and control the spread of viral infections. This requires knowledge of the existing virome to identify novel and emerging viruses and support development of appropriate measures to manage associated risk. By monitoring and protecting these animals from emerging viral diseases, we can help ensure their ongoing survival and preserve the biodiversity of our planet.