Highland Loach: A Keystone Species in the Lhasa River Ecosystem

The highland loach fish (Cobitis) plays a crucial role in the Lhasa River ecosystem, serving as both a predator of aquatic insects and grazers of algae, as well as a key food source for top-level predatory fish and birds. This fish occupies a pivotal position in the food web, acting as a ‘link’ between various trophic levels. On one hand, it preys on aquatic insects, controlling their population and ensuring the health of the river ecosystem. On the other hand, it also serves as an important food source for larger predatory fish and birds, effectively transferring energy up the food chain. The stability of the highland loach population is therefore essential to maintaining the overall aquatic ecological balance of the Lhasa River basin. Any disruptions to its population, such as pollution or habitat loss, can have cascading effects throughout the ecosystem.