What human activities have interfered with the ecological niche of the southern sea otter?

Human activities such as oil spills, coastal development, and pollution have significantly interfered with the ecological niche of the southern sea otter. These actions degrade their habitat and food sources, leading to declines in their populations. Additionally, fisheries that target sea urchins and other prey species can disrupt the balance of the ecosystem, further impacting the otters' ability to thrive. Conservation efforts are crucial to mitigate these impacts and restore their habitats.