Final answer:
Alien invaders can exhibit various behaviors within ecological communities, affecting biodiversity and native species populations. Their success is influenced by environmental conditions, human activity, and their own traits. Invasive species can dominate new territories, especially in altered aquatic systems or due to climate change impacts.
Step-by-step explanation:
The question relates to how alien invaders (invasive species) might interact with and affect ecological communities. Invasive species that successfully invade new areas can exhibit different behaviors such as dominating the system and spreading rapidly, persisting for a period before disappearing, remaining at low abundances, blending into the existing community, or causing the extirpation of native species. The success of an invasion can be influenced by several factors, including environmental variability, predictability, severity, human alterations to the ecosystem, and the physiological and morphological traits of the species involved.
Research suggests that alien species are more likely to dominate in aquatic systems with high or low environmental variability and severity, and particularly in regions heavily altered by humans. Invasive species may also capitalize on opportunities created by climate change, which can disrupt native assemblages and increase invader success when native species are depleted or the environment altered.