Chlorophyll and Phytoplankton in Lakes. Emily DeBolt Josh Conway. Chlorophyll and phytoplankton tell the story of lake productivity. Why study chlorophyll and plankton How to collect data Interpreting data from local lakes. Why study chlorophyll and plankton.
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tell the story of lake productivity.
Most chlorophyll in the hypolimnion ??
epi: 1mhypo: 8m
SA: 207 km2
Mean depth: 6.8 m
Max depth: 16.8 m
Length: 20.9 mi
Width: 5.8 mi
Values only for epi and meta obtained
Mostly greens and blue-greens
- not sure why…
All chlorophyll < 1 ug/L so
possibly an oligotrophic lake
Note Oscillatoria presence!!
Phytoplankton mostly in epilimnion
Chlorophyll decreases with depth
Highest chlorophyll values!
Polluted – excess phosphorous and anoxic hypo
Green algae most dominant, but also some BG which makes
sense bc Onondaga has highest phosphorous of any of the
lakes by far (all other lakes < 2 uM, Onondaga almost 15 uM)
Calanoid copepods were most common in all lakes except
Onondaga – where Daphnia were most abundant – Daphnia
do well with good quality food which might make sense with
the high green algae levels
10% Chrysophyta (Chrysophyceae)
23 % Chlorophyta
Phytoplankton are hanging out at the metalimnion
Most phytoplankton diversity of all
Secchi disk at 3 m, so not sure why most phyto would
be down at 6 m (think critical mixing depth)
The only phytoplankton present:
Secchi disk at 9m – so good visibility in the lake
Highest chlorophyll values at chemocline
– must be reading chlorophyll from
the purple sulfur bacteria
Hardwater, meromicitc lake, 52 m deep, very
Onondaga has highest values, Deer has lowest
No real consistent patterns…
Lake: dominant phyto: trophic state (?)
ADK lakes: Sept 9-11
Onedia: Sept 21-22
Onondaga: Sept 28-29
Green: Oct 5-6
Would have thought possibly lakes visited later
more mixed and lakes visited earlier still stratified…
Phytoplankton growth affected by temperature, light
Nutrients. Right before FT is a good time for them –
But after turnover is not so good - although sometimes
Turnover actually increases nutrients so there is a bloom.
Since we found so many algae in hypo layer – does that meanall lakes were mixed? This doesn’t appear to be true basedon the temp data…
Images satellite de Saint-Pierre et Miquelon (off New Brunswick, Canada)