MERC ER01-14
15
2. Four (4) taxa or general categories listed in the challenge sample were
absent
in the treated
samples: diatoms, Harpacticoida, barnacle nauplii, and Turbellaria
3. Fifty percent (50%) fewer copepod nauplii were found in the treated samples as in the
challenge samples.
4. Polychaetes, rotifers and eggs were similar in quantities in both challenge and treated samples.
5. Copepod nauplii and rotifers in treated samples measured mainly in the 50-60 µm size class.
6. Polychaetes were in the 50-70 µm size class.
7. Bivalves averaged 60 µm in size.
8. Only one Calanoida measuring 64 µm was identified.
9. Augmentation material was present in the samples.
AUG Live Organisms
≥
10 - <50 µm
Samples from the time-integrated chambers.
Sample ID
Ave (#/ml)
SD
Challenge
1,864
292
Treated
1,185
121
Phytoplankton Observations
Dominant species was the diatom
Skeletonema
.
Challenge and Treated
1. Larger number of long chains (10-12 cells), increasing the population density.
2. None of the three chain-forming species (
Skeletonema
,
Thalassiosira
, and
Chaetoceros
),
observed were over 20 µm in their minimum dimension.
3. Augmentation material was observed in all samples.
Treated (post-filter)
1. Few observed in the treated samples were over 20 µm.
2. The larger plankton noted in the challenge samples were absent in the treated samples.
AUG Active Chlorophyll-a Data
Challenge and treated samples from the time-integrated chambers. Ambient sample was taken
before augmentation.
Sample ID Ave (µg/L)
SD
Ambient
6.31
0.32
Challenge
6.48
0.10
Treated
5.55
0.36
