Final answer:
Alien predators severely amplify the impact of native predators by introducing new forms of predation, competition, and ecosystem alterations that can result in significant biodiversity loss and degradation of native ecosystems.
Step-by-step explanation:
Alien predators have amplified the impact of native ones. Introduced species, like mammalian predators on islands formerly without such species, pose dramatic and often negative impacts on native species. They frequently prey on native birds and animals that have not evolved to handle such predation, leading to significant ecological alteration. Moreover, alien species like the round goby have multiple effects, such as predation on native invertebrates and competition with native fishes, while also impacting populations of invasive mussels. Ecological chain reactions can occur, with one introduced species affecting multiple native species in a cascading effect. Overall, the introduction of alien species can have profound and unpredictable consequences on native ecosystems, leading to substantial biodiversity loss and ecosystem degradation.