Question

Make a bar graph of the data from the field experiment. (For additional information about graphs, see the Scientific Skills Review in Appendix F.) What do these data indicate about the salinity tolerances of S. patens and T. angustifolia?

Short answer

According to the data, S. patens is more salinity tolerant than T. angustifolia, and they can grow on both salt and freshwater marshes.

Step-by-step solution

First bar graph 

The first graph depicts the salinity of S. patens in both salt and freshwater marshes.The experiment is conducted both with and without competition (neighbors).

According to the bar graph and data provided, S. patens thrives in freshwater without the intervention of its neighbors. In saltwater, though, the effect is essentially the same.

Second bar graph

The second bar graph clearly shows that the T. angustifolia species is not found in saltwater marshes due to salinity;it is absent from experimental salt marshes even when there are no competitive neighbors.

It did not develop in the greenhouse at greater salinity levels. Whereas it entirely thrives on freshwater without competition.

Observation from the bar graph

An experiment examined the impact of salinity and competition, two biotic and abiotic factors, on the growth of two different species. According to observations, Spartina patens (salt marsh hay) dominate salt marshes, while Typha angustifolia (cattail) does so in freshwater marshes.