. Bulletin. Science. 66 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES E. coli STATION 2. STATION 5 UIIU â FLOOD â EBB * â * -* * Sjpjpjrjt * J? $ Fig. 3. Densities of E. coli (MPN/100 ml) during flood and ebb tidal flows, February 2003-2004. The "less than" symbol (<) indicates densities below the method detection level for the dilution used. flows at all stations, ranging from 102 to 103 MPN/100 ml with the greater den- sities occurring during runoff events (Tables 3 and 4). However, the greatest den- sity of this FIB group (41,060 MPN/100 ml) was measured at Station 4 on Sep- tember 3
. Bulletin. Science. 66 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES E. coli STATION 2. STATION 5 UIIU â FLOOD â EBB * â * -* * Sjpjpjrjt * J? $ Fig. 3. Densities of E. coli (MPN/100 ml) during flood and ebb tidal flows, February 2003-2004. The "less than" symbol (<) indicates densities below the method detection level for the dilution used. flows at all stations, ranging from 102 to 103 MPN/100 ml with the greater den- sities occurring during runoff events (Tables 3 and 4). However, the greatest den- sity of this FIB group (41,060 MPN/100 ml) was measured at Station 4 on Sep- tember 30, 2003 during dry weather. When looking at individual station histo- grams for E. coli (Fig. 3), flood densities exceeded ebb densities more than 50% of the time (Table 5) with the greatest percentages (80%) at Stations 1-3. Enterococci. Mean Enterococci densities (Table 3) were slightly greater than those of E. coli, ranging from 103 to 104; the greatest density occurred during wet weather at Station 4 on March 16, 2003, where the count was measured at 141,360 MPN/100 ml. During dry weather, enterococci densities in flood flows tended to be greater on average than ebb flows, but this trend was not statistically significant (Table 3). Tests among replicated events did show a significant increase in En- terococci during the ebb flow at Station 2 during the March 16th wet weather event (Table 4). When individual stations histograms are examined, flood densities exceeded ebb densities greater than 50% of the time at all stations (Table 5). Discussion The central question in this study is whether or not the Ballona Wetlands act as a sink or source for FIB groups of bacteria. If acting as a sink, densities of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles
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