Non-native species affect an ecosystem because they are organisms that are living outside of their natural range. This non-native species is a lot like pollution. It can harm or destroy native species because they compete or hunt for their food and water.
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bird population decreased as the snake fed on the bird eggs.
rats
There are many things that can cause an ecosystem to become endangered. When an ecosystem and the species in that ecosystem become endangered, it is known as a hotspot.
A species that "belongs" in a particular area, as you put it, is called a native species. I am sure that animals who find themselves in a non-natural habitat are called a non-native species, an invasive species, or introduced species. The introduction of some species into new environments can have devastating results - this is because the invasive species can eradicate necessary native species that are necessary to support a healthy ecosystem.
Some animals would die. (some species would die)
a non native species is a species that isn't within a certain ecosystem.
people
Imported species may damage the ecosystem.
It could destroy a whole ecosystem or foodweb.
An "invasive species" is defined as a species that is 1) non-native (or alien) to the ecosystem under consideration and 2) whose introduction causes or is likely to cause economic or environmental harm or harm to human health.
The introduction of nonnative species has environmental consequences.
most often not because the ecosystem has developed and sustained itself amongst itself and what its got, and if you throw an un known animal in there, it will unbalance the whole ecosystem.
The keystone species is critical to maintaining the stability of an ecosystem, and changes in its population indicate changes in ecosystem health.
Environmental disturbances are changes in the environment that cause lasting and major changes to the ecosystem. Some examples are floods, fires, introduction of new species, windstorms, and insect outbreaks.
The introduction of a new predator can have the species eaten with no time to evolve to defend against it
The fish shares a niche with another species
Yes, they all can influence continual change in an ecosystem. Any of these could cause an ecosystem to spiral out of control, or could cause it to settle into a new ecosystem depending on the specifics.