MERC ER01-14
23
1. Nine (9) taxa or general categories were present in the challenge samples. Rotifera,
Polychaeta, copepod nauplii, bivalves, Calanoida, eggs, diatoms, tintinnids, and barnacle
nauplii.
2. Rotifera were the most abundant.
Treated (post-filter)
1. Seven (7) taxa or general categories remained in the treated sample: Rotifera, copepod
nauplii, bivalves, barnacle nauplii, Polychaeta, tintinnids, and eggs.
2. Copepod nauplii and Rotifera measured in the 50-60 µm size class with a substantial reduction
of both, ~50%, from challenge.
3. Polychaetes (soft-bodied) found were mainly in the 50-70 µm size class; however, one
polychaete measured 90 µm.
NTL Live Organisms
≥
10 - <50 µm
Samples from the time-integrated chambers.
Sample ID
Ave (#/ml)
SD
Challenge
2,633
401
Treated
2,260
87
Phytoplankton Observations
Challenge and Treated
1. Most cells measured between 10 and 30 µm.
2. The majority were smaller species (
Eutreptia
and
Amphidium
) over 10 µm.
3. Very few chain-formers; those observed (
Skeletonema
) were very short chains composed of
mostly empty skeletal remains plus 1-2 living cells.
4.
P. minimum
was observed, but mainly empty skeletal remains plus a few living cells.
5. No large cells, such as the diatom,
Cosinodiscus
were observed in the treatment samples.
NTL Active Chlorophyll-a Data
Samples from the time-integrated chambers.
Sample ID Ave (µg/L)
SD
Challenge
3.9
0.01
Treated
3.7
1.11
FXIT-30.1-AUG
was canceled due to inclement weather.
