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Table 2

Detected pesticides in the studied streams (ng/g dry weight).

  DF Chlorpyrifos L-Cyhalothrin Cypermethrin pp'DDT pp'DDD
San Juan 0.29          
May 2015   nd nd nd nd 1.8
Dec. 2015   nd nd nd nd 2.2
Martin 0.60          
Dec. 2014   0.9 nd nd nd nd
Jan. 2015   nd nd 6.4 nd nd
Oct. 2015   nd nd nd nd 0.8
Gato 0.43          
Jan. 2015   nd 0.9 148 nd nd
May 2015   nd nd 199 nd nd
Dec. 2015   nd nd nd 4 nd
Sauce 0.43          
Jan. 2015   nd nd 14 nd nd
May 2015   nd nd nd nd 1.9
Dec. 2015   nd nd 51 2 nd
LESS DISTURBED            
unnamed 0.2          
Jan. 2015   nd nd 18.7 nd nd
Buñirigo 0.29          
Dec. 2014   1.5 nd nd nd nd
Jan. 2015   nd nd 6.6 nd nd
Morales 0.25          
Dec. 2014   3.4 nd nd nd nd
Destino 0.14          
Dec. 2014   5.8 nd nd nd nd

DF: Detection frequency; nd: not detected. Samplings without at least one pesticide detected are not shown.

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