How do different parts in an ecosystem work?
What happens if something changes in an ecosystems?
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Wind, rain, predation and earthquakes are all examples of natural processes which impact an ecosystem. Humans also affect ecosystems by reducing habitat, over-hunting, broadcasting pesticides or fertilizers, and other influences. The line between natural and human caused effects often blurs. For example, sediment in streams and rivers can damage these tender ecosystems. But the cause may have been a post-storm mudslide or acreage stripped bare for farming. Anything that enters an ecosystem – from sunlight to rain to contaminants – has the potential to change it. Scientists refer to these factors as drivers.
Drivers and Ecosystems
An ecosystem consists of all of the natural elements in a specific environment and the relationships among them. Ecosystems possess not only living components, such as plants and animals, but also non-living components, like air, water, soil and rocks. Types of ecosystems include forests, grasslands, tundra, lakes, wetlands, deltas and coral reefs. Drivers are any events or processes that change an ecosystem. Some have a direct influence on an ecosystem. Severe weather, such as a tornado, blizzard, hurricane or hail are natural events that directly impact an ecosystem. Animals such as a bear or mountain lion roam in search of new territory. This could have a direct impact on an ecosystem as the animal hunts food in its new territory, thereby reducing existing flora or fauna. The predatory animal's behavior is natural, but it can alter an ecosystem. Direct drivers may also be human influenced. The introduction of a species not normally associated with a particular ecosystem – such as kudzu, silver carp or zebra mussels – has a devastating impact on that.