Effects of Organic Herbicides on Phototrophic Microbial Communities in Freshwater Ecosystems - Reviews of Environmental Contamination and Toxicology - page 92

Table 2 Summary list of studies in which the effects of atrazine were assessed on phototrophic freshwater microbial communities in experimental systems
Experimental system

Conc. (mg/L) Community Parameters Effects LOEC Reference Comments

5-L microcosms
(10-21 days)

10 Phytoplankton Community composition + Bérard et al. ( 1999a, b ) Seasonal variations

in the response

Primary production ±

5-L microcosms 10 Phytoplankton Community composition + Bérard and Benninghoff

( 2001 )

Seasonal variations
in the response

PICT ±

Laboratory streams
(4 weeks)

12; 150 Periphyton Biovolumes + 12 Carder and Hoagland

( 1998 )

Community compositon −

Chlorophyll a + 50

4-L microcosms
(72 h)

50; 250 Periphyton Biovolumes + 50 DeLorenzo et al. ( 1999 )

Primary producton + 50

Community composition + 50

Chlorophyll a −

Primary production + 15 Effects on commu-

nity composition

Wetland mesocosms
(2-106 days)

15-75 Periphyton Respiraton + 25 Detenbeck et al. ( 1996 ) Vary with nutrient

supply ratio

Community composition ±

PICT + 50

Chlorophyll a + 20

0.6-L microcosms
(168 h)

20; 200 Periphyton Primary production + 200 Downing et al. ( 2004 )

Community composition + 20

120-L microcosms
(14 days)

5 Periphyton Chlorophyll a − Gruessner and Watzin

( 1996 )