Precipitation/mm 8 Hypothesis 1 765432 1 0 0 50 100 150 200 250 Rabit density/number of individual hectar-1 300 350 O Sample 1 Rank (R1) Sample 2 x2 O Sample 2 Rank (R2) Arthropods/individual hectar-1 3000 2500 2000 1500 1000 500 0 Hypothesis 2 0 10 20 30 40 50 60 70 NPP/g m--2 y-1 O Sample 1 Rank (R1) Sample 2 x2 Sample 2 Rank (R2) 80 80 90 Precipitation/mm 3000 2500 2000 1500 1000 500 0 Hypothesis 3 0 50 100 150 200 250 300 350 Arthropods/Individual hectars-1 O Sample 1 Rank (R1) Sample 2 x2 Sample 2 Rank (R2)