In a word, adaptation. Same as for any other living thing. The zebra mussel is a native of Russia, but has found its way into the Great Lakes ecosystem. It's free-swimming form was doubtless transported there in the tanks and bilges of ships. Use the links below for more information.
Yes they are an invasive pest in NZ
Zebra mussels reproduce rapidly due to high fecundity rates and lack of natural predators in new ecosystems. Garlic mustard possesses allelopathic compounds that inhibit the growth of other plant species, giving it a competitive advantage and allowing it to spread quickly in new environments.
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yes it is
The adaptations of mussels are quite extensive. Mussels attached to ships and migrated to waters that required them to be able to eat new food sources.
Mussels have adapted by learning how to survive. They mate through the water, mussels cant move after they settle on the bottom. They then attach their eggs to fish where they hatch and live until they are about 3 weeks old when they then fall to the bottom and live for many years.
Zebra mussels have a high reproductive rate and no natural predators in their new ecosystem. Garlic mustard can outcompete native plants due to its fast growth and ability to release chemicals that inhibit the growth of other plants, allowing it to rapidly establish itself and spread.
Zebra mussels compete for plankton with other filter feeders, but that is not really why they are considered to be a problem. They tend to grow in great abundance where there is a water current that brings them their food faster, and such currents occur at the intake pipes that are put into the Great Lakes to get water, and the pipes then get clogged. So it is more of a problem with human engineering, than a problem affecting the food chain. New Answer: they will compete with netive shelfish and clams and hurt their populations
why do invasive species tend to be so successful in their new environment
Green
Yes, it is possible to relocate a feral cat to a new environment, but it can be challenging and may not always be successful. It is important to consider the cat's well-being and safety when attempting to relocate them.