Forest A (community A) has 5 tree species each represented by 100 individuals and forest B...

Forest A (community A) has 5 tree species each represented by 100 individuals and forest B (community B) has 5 tree species each represented 10 individuals. What is the Shannon diversity index for both forests? Which forest has higher diversity? Please show me how to calculate it!

0	100	35	1.00	0	0
1	65	?	0.65	0	0
2	45	15	?	3	1.35
3	30	20	0.30	1	?
4	10	10	0.10	1	0.10
5	0	0	0.00	1	0

Expert Solution

Shannon diversity index ,H' = − ∑ Pi ln Pi

FOREST A

Species	No. if individuals	Relative abundance (Pi)	Ln Pi	Pi Ln Pi
1	100	0.2	-1.6094	-0.32188
2	100	0.2	-1.6094	-0.32188
3	100	0.2	-1.6094	-0.32188
4	100	0.2	-1.6094	-0.32188
5	100	0.2	-1.6094	-0.32188
Total	500			-1.6094

Shannon diversity index ,H' = -1.6094

FOREST B

Species	No. if individuals	Relative abundance (Pi)	Ln Pi	Pi Ln Pi
1	10	0.2	-1.6094	-0.32188
2	10	0.2	-1.6094	-0.32188
3	10	0.2	-1.6094	-0.32188
4	10	0.2	-1.6094	-0.32188
5	10	0.2	-1.6094	-0.32188
Total	50			-1.6094

Shannon diversity index ,H' = -1.6094

Both the forests have same diversity. It accounts for both abundance and richness. Lower value of index means more diversity.

gladiator answered 3 years ago

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