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Ref. No. [UMCES]CBL 12-005
11
Overall, phytoplankton conditions and cell densities were similar throughout trials 1, 2,
and 3. The majority of the phytoplankton were in the 5 to <10 µm category. A strong winter
bloom of
Skeletonema costata
and
Heterocapsa rotundatum
occurred during Trials 1, 2, and 3.
Chains of
S. costata
were long and healthy; some were in the reproductive phase by presence of
auxospores.
H. rotundatum
were also experiencing a winter bloom as noted by high density in
the samples and distinctive color and odor of the water during sampling.
A very diverse population of phytoplankton was observed during trials 4 and 5. The
dominant species were mostly chain-forming diatoms (
Thallassiosira
sp.
Chaetoceros
sp.).
Many phytoplankton species were counted in small numbers along with a few larger
dinoflagellates and diatoms. All samples contained large numbers of rotifers (see zooplankton
analysis) found to be 3 distinct species.
BOLL-1
March 16, 2011
Time Point
Total Phyto
10-50 µm (#/ml)
Total Phyto
5-10 µm (#/ml)
Ambient
Post 40 µm
Ambient
Post 40 µm
T-0 Initial
3,636
697
11,169
5,554
T-1 Mid
4,651
424
16,784
5,736
T-2 Final
12,711
4,651
37,088
11,199
BOLL-2
March 17, 2011
Time Point
Total Phyto
10-50 µm (#/ml)
Total Phyto
5-10 µm (#/ml)
Ambient
Post 40 µm
Ambient
Post 40 µm
T-0 Initial
6,393
629
10,440
5,220
T-1 Mid
4,537
1,144
9,135
8,043
T-2 Final
2,757
606
8,164
6,647
BOLL-3
March 24, 2011
Time Point
Total Phyto
10-50 µm (#/ml)
Total Phyto
5-10 µm (#/ml)
Ambient
Post 40 µm
Ambient
Post 40 µm
T-0 Initial
1,318
136
19,788
10,865
T-1 Mid
2,992
1,712
15,903
7,223
T-2 Final
1,076
144
12,383
5,645