Sulejow Reservoir^a

r = 0.51

n = 31

p < 0.05

Buckeye Onion Island^b

r_s = 0.79

n = 10

p < 0.05

Harsha Main^b

r_s = 0.93

n = 17

p < 0.05

Lake Erie^b

r_s = 0.85

n = 24

p < 0.05

Lake Attitash^c

r_s = 0.816

n = 30

p < 0.001

Lake Cochichewick^c

r = 0.754

n = 22

p < 0.001