MERC ER01-14
20
Zooplankton Taxa and Observations
Minimum dimensions measured.
Challenge (pre-filter)
1. Nine taxa or general categories were present in the challenge samples: copepod nauplii,
Rotifera, Polychaeta, bivalves, eggs, Calanoida, barnacle nauplii, diatoms, and tintinnids.
2. Augmentation material was present in the samples.
Treated (post-filter)
1. Six (6) taxa or general categories remained in the treated samples: Rotifera, copepod nauplii,
tintinnid, eggs, Bivalves, and Polychaeta.
2. Copepod nauplii were in the 50-60 µm size class but fewer were found in the treated samples
than in the challenge samples. The removal of live organisms > 50 µm was 99.7%
3. Polychaetes measured 60 µm.
4. 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
9,097
967
Treated
3,273
290
Phytoplankton Observations
Challenge and Treated
1. Very high species diversity noted.
2. The dominant species was the diatom
Skeletonema.
Treated (post-filter)
1. Numbers were noticeably reduced in the treated samples.
2. Although the majority of the larger species were removed, many in the > 30 µm range were
noted in the treated sample, especially chain-formers.
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
17.6
1.7
Challenge
18.5
0.9
Treated
14.8
1.2
