The following figure shows studies in a stream where enclosures were setup either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae?
A)If trout are present in a system,alga production is low and invertebrate population levels are also low.
B)If trout are present in a system,alga production is high and invertebrate population levels are also high.
C)If trout are present in a system,alga production is high and invertebrate population levels are low.
D)Trout do not seem to affect the alga production;only the invertebrate populations are affecteD.
E)Trout do affect the alga production but not the invertebrate populations.

Question

The following figure shows studies in a stream where enclosures were setup either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae? 
A)If trout are present in a system,alga production is low and invertebrate population levels are also low. 
B)If trout are present in a system,alga production is high and invertebrate population levels are also high. 
C)If trout are present in a system,alga production is high and invertebrate population levels are low. 
D)Trout do not seem to affect the alga production;only the invertebrate populations are affecteD. 
E)Trout do affect the alga production but not the invertebrate populations.

Quizplus · Accepted Answer

The graph shows that when trout are present in a system, alga production is high while invertebrate population levels are low. This suggests that the presence of trout can lead to increased grazing on invertebrates, which in turn leads to lower invertebrate population levels and reduced grazing pressure on algae. Thus, trout affect alga production, indirectly, by reducing the invertebrate populations that consume algae.

The Following Figure Shows Studies in a Stream Where Enclosures