Measuring how diversity, specie richness and productivity changes with shore height.

1.

For specie diversity should i just put the number of different specie i found? e.g. Lower 12 middle 7 upper 4.. but really i can't do any statistical analysis because there's no variation in results as it's a set number.

2.

Productivity percentage cover of each specie of alga on the different height so each shore height will have sub bar graphs representing each specie of alga which should show certain specie increasing but some decreasing as some species are not abundant at lower shore, or should i just show that the percentage cover increasing as the shores lowers ?

3.

for specie richness should i do the same as productivity sub bars for each shore height for each specie showing how some increase and some decrease then a total number of individuals found on each shore. The problem i can't work out is that we measured barnacles as percentage cover so i wouldn't know how to add that to the number of individuals.