1. What does the graph below show
What does the graph below show? Species richness refers to the different species of SAV that live in Cocktown Creek. The highest point of the graph shows the highest number of different species of SAV in the creek. The number of species of SAV increased from despite hydrilla, an invasive species entering the creek. Species richness increased because hydrilla not yet become invasive, meaning it did not reproduce enough to spread throughout the creek or become established in its new ecosystem. In 2007 the species richness decreases because hydrilla is now established and out-competes native SAV for resources such as sun and space to grow. If native SAV do not get sunlight they cannot produce glucose in order to survive and SAV will die if they do not have any room to grow. This disruption in the ecosystem makes it unstable. Aquatic organisms that rely on native SAV for food either move to another part body of water or die from a lack of food/energy. The end of the graph shows the species richness is constant. There are no increases or decreases in SAV diversity. This means the creek’s ecosystem is becoming more stable since hydrilla’s take over of the creek. Aquatic organisms that can use hydrilla as a food source replace those that cannot.

2. The graph below shows the average species richness in Cocktown Creek.
Use the graph below to answer the question in CER format:
How has the richness (diversity) of SAV found in Cocktown Creek changed from ?