All of the factors you've mentioned can contribute to allowing an invasive species to outcompete a native species. Here's how each one plays a role:
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They eat the same food resources: When an invasive species and a native species compete for the same food sources, the invasive species can reduce the availability of those resources for the native species, potentially leading to a decline in the native population.
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They are introduced by humans at high rates: Human activities can facilitate the rapid spread of invasive species, allowing them to establish themselves in new areas more quickly than native species can adapt or migrate. High rates of introduction can lead to higher population sizes of the invasive species.
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They have no predators so they can spread rapidly: In their new environments, invasive species often do not face the same predators or diseases that would limit their populations in their native habitats. This lack of natural controls can allow invasive species to proliferate and outcompete native species.
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They use the same shelter or space: If an invasive species occupies the same habitats or niches as native species, it can lead to competition for space. This can limit the resources available to native species, contributing to their decline.
In summary, the combination of these factors can significantly enhance the competitiveness of invasive species, often leading to ecological imbalances and threats to native biodiversity.