To solve this question, we need to understand the concept of "ex-situ conservation" in the context of biological conservation techniques.
Ex-situ conservation refers to the preservation of components of biological diversity outside their natural habitats. The primary goal is to maintain viable populations of the species in controlled settings. This method is particularly useful for species that are endangered or threatened in the wild and require proactive measures for their survival.
Let's evaluate each given option to determine which one is associated with ex-situ conservation:
- Wildlife Safari parks: These parks are facilities where animals are kept in large enclosures or semi-wild environments. They provide animals the opportunity to live in an environment that mimics their natural habitat, albeit under human management and care. Hence, Wildlife Safari parks are a form of ex-situ conservation because they preserve and breed species outside their natural ecosystems.
- Biodiversity hot spots: These are regions with a significant reservoir of biodiversity that are under threat from humans. Conservation in these areas is typically conducted in-situ, meaning within the natural habitat.
- Amazon rainforest: This is a large tropical rainforest with rich biodiversity. Conservation efforts here are primarily in-situ, aiming to protect the ecosystem and species within their natural setting.
- Himalayan region: Like the Amazon, this region is significant for its biodiversity, and conservation here is mostly in-situ.
Based on the definitions and evaluations above, the option that is related to ex-situ conservation is Wildlife Safari parks.
Therefore, the correct answer is: Wildlife Safari parks.