ECOLOGICAL SITUATION ON THE TYULENIY ISLAND IN THE OKHOTSK SEA (2015): POPULATION INTERACTIONS BETWEEN PINNIPEDS, BIRDS, IXODIDAE TICKS AND VIRUSES

Objective. Analysis of environmental status Tyuleniy Island after a 25-year break in ecological and virological expeditions.Discussion. The paper presents the first results of the ecological and virological expedition to the Tyuleniy Island in August 2015 – the first after a 25 year break. Species of colonial seabirds and pinnipeds are described as well as their population interactions with each other and with Ixodidae ticks Ixodes uriae, which parasite in breeding colonies of birds and are hosts and vectors of several arboviruses that pose a potential risk to mammals. Two strains were isolated from common murre cloaca swabs using chicken embryo biological model. Complete genome sequencing permitted to identify these strains as NDV/Uria aalge/Russia/Tyuleniy Island/109/2015 (GenBank ID: KU601398) and APMV-4/Uria aalge/Russia/Tyuleniy Island/115/2015 (GenBank ID: KU601399). Strain of new virus (Bunyaviridae, Nairovirus) was isolated from homogenate of I. uriae on the model of intracerebrally inoculated newborn mice and was identified by sequencing of the fragment (240 nucleotides) of the N-gene.Conclusion. The Tyuleniy Island confirmed its importance as a reservoir of arboviruses. The ecological conditions of the Tyuleniy Island requires urgent action to clean up the island from the old buildings and giving it the status of the reserve.