Publications by authors named "Sujoo Cho"

Background: The tiger population in Southwest Primorye is small and predominantly isolated from the main Sikhote-Alin population, which constitutes approximately 90% of the wild Amur tiger population. By 1996, this population declined to fewer than 10 individuals, but it has since grown and expanded into nearby habitats, now numbering over 50 individuals. Therefore, the regular genetic monitoring of this population is essential, as it has grown from a few founding members and remained geographically isolated.

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Non-invasive genetic approaches, particularly using fecal samples, are commonly used to study endangered and elusive species, as they are easy to collect with minimal permission and cause little disturbance to the subject population. However, such studies face limitations due to poor DNA yield, which affects the overall utilization of collected samples and increases data errors. Here, we evaluated the impact of sample age and collection season on the performance of DNA extracted from feces (spraints) of the Eurasian otter (), a semi-aquatic apex predator in South Korean freshwater ecosystems.

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Article Synopsis
  • - Southwest Primorye is home to about 9% of the wild Amur tiger population, which has significantly recovered from fewer than 10 individuals in 1996 due to decades of conservation efforts.
  • - A study using non-invasive genetic analysis found 32 Amur tigers and identified issues like low genetic diversity and signs of past population bottlenecks, raising concerns about inbreeding.
  • - The findings underscore the necessity to create ecological corridors to connect to other tiger populations for improving genetic diversity and ensuring long-term conservation.
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Small populations of the endangered species are more vulnerable to extinction and hence require periodic genetic monitoring to establish and revisit the conservation strategies. The Amur leopard is critically endangered with about 100 individuals in the wild. In this study, we developed a simple and cost-effective noninvasive genetic monitoring protocol for Amur leopards.

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