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There are two non-native trees that are taking over many of the lower riparian life zones in the western part of the state. They are the tamarisk and russian olives. Both plants can do lots of harm to the native environment and wildlife.
In the late 1800's and early 1900's, people planted tamarisk and russian olive trees by the rivers for decoration and to help stop erosion on the banks of the river. It did help with erosion a little; however, it formed many more problems. First, they drink much more water from the rivers than the native plants and trees. This leaves less water to flow down stream. Next, the trees take salt from the water and ground and bring it to the top surface soil. The native plants have a hard time growing in the salty soil and the tamarisks and russian olives take over. In addition, few animals can eat the tamarisk and russian olives. Without the native plants, some fish, birds, insects, deer, and other animals do not have anything to eat or places to live. A domino effect continues up the food chain affecting all the plants and animals that live by the rivers.
There are currently efforts by humans to get rid of tamarisks and russian olive trees. However, they reproduce so quickly and have spread to so many places that it will be tough and take a long time to get rid of them. Though, if we don't keep trying, many native plants and animals will no longer be able to live by the rivers. Tamarisks and and russian olives clearly need to be removed from the environment as soon as possible.
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