CATLIN LAKE Data collected 9102006 Presented by Maureen

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

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

YSI – Averages from data • Temperature - 17. 46 degrees C • Conductivity – 27. 52 u. S/cm • DO% - 72. 60% • DO Conc. – 6. 9 mg/L • p. H – 6. 26 • ORP – 162. 35 m. V • Nitrate – 0. 75 mg/L • Turbidity – 1. 27 NTU

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 2 m, and then another one after the 4 th and 5 th meters

• Chlorophyll data • Silica data Epi. 71. 3 Conc. Epi. Meta. 25. 7 Hypo. 13. 8 12. 84 Abs. 0. 213 Meta. 8. 52 0. 168 Hypo. 21. 2 0. 299

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.

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.

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