Effects of Sewage Discharge on Trophic State and Water Quality in a Coastal Ecosystem of the Gulf of California

Table 2

Values of temperature, salinity, dissolved oxygen, nitrite, nitrate, ammonium, orthophosphate, and chlorophyll 𝑎 around year in La Salada Cove.

Spring

Summer

Fall

Winter

Mean ± SD

Median

Min. − Max.

Mean ± SD

Median

Min. − Max.

Mean ± SD

Median

Min. − Max.

Mean ± SD

Median

Min. − Max.

Temperature (°C)

27.4±0.5

28.1

27.2−29.7

29.3±0.8

29.6

28.0−30.2

22.4±2.8

21.2

17.9−26.9

16.9±1.1

16.9

14.4−18.9

DO (mg L^−1)

4.3±0.7

4.2

3.4−6.7

5.6±0.3

5.6

4.7−6.1

5.8±1.7

5.6

2.5−8

5.5±1.6

5.8

1.7−8.1

N-NO2^− (𝜇M)

0.218±0.47

0.131

0−3.87

1.798±1.63

1.277

0.35−9.11

0.511±0.38

0.378

0.03−1.46

0.661±0.37

0.521

0.01−1.32

N-NO3 (𝜇M)

0.145±0.17

0.074

0.01−0.96

0.09±0.08

0.064

0.02−0.46

0.359±0.25

0.377

0.03−0.82

0.517±0.23

0.456

0.06−0.94

N-NH4 (𝜇M)

5.82±6.83

19.79

0.23−19.31

1.733±2.6

0.806

0.05−16.22

4.371±6.13

1.197

0.01−19.09

1.609±1.21

1.238

0.09−3.99

PO4 (𝜇M)

4.291±6.38

1.231

0.34−21.98

1.495±0.55

1.26

1.07−5.1

2.439±3.4

13.54

0.32−16.42

5.014±3.03

2.184

1.38−21.98

Chl a (mg m^−3)

0.9±1.8

0.4

0−13.7

5.7±0.7

5.6

3.4−6.7

2.5±5.6

0.8

0−37.2

2.2±2.9

1

0−16.9