1. Data collected 9/10/2006 Presented by Maureen Gregory
CATLIN LAKE
Data collected 9/10/2006
Presented by Maureen Gregory

2. Weather during collection
Mostly sunny, clear ~ light breeze of about 5mph from the North
Scattered clouds
Fog just lifted

3. YSI – Averages from data
Temperature degrees C
Conductivity – 27.52uS/cm
DO% %
DO Conc. – 6.9mg/L
pH – 6.26
ORP – mV
Nitrate – 0.75mg/L
Turbidity – 1.27NTU

7. Light data (Partially collected a week later by Jason, thanks Jason)
Secchi depth – vanished at 3.6
reappeared at 3.5
Light meter gave a range of 450 – 0.3
- big drop came after 2m, and then another one after the 4th and 5th meters

8. Chlorophyll data Silica data Epi. 71.3 Conc. Abs. Epi. 12.84 0.213
Meta
Hypo
Silica data
Conc Abs.
Epi
Meta
Hypo

9. Phytoplankton Only able to find 28 in the samples retrieved
Most common was a Chrysophyte, 9 were found in the epi.
Second most common was a flagellate, 6 were found in the epi.

10. Zooplankton – Schindler Trap
73 specimens were found in 9 subsamples of the three layers
Callanoid copepods were the most common in all three layers, 55 found total
15 Daphnia were found in the hypolimnion, only 2 were found in the epilimnion
Also found a Chonochilus rotifer in the epi.

11. Zooplankton – Net tows
In 6 subsamples of the two tows, 168 individuals were found
56 Callanoid copepods in the first tow; along with 5 Daphnia and 2 copepod Nauplius
93 Callanoid copepods in the second tow; along with 12 Daphnia