Chlorophyll levels in Sweeney and West Creek

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Chlorophyll levels in Sweeney and West Creek

• By Genevieve Greer

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Overview

• Average daily Chlorophyll a levels for sampling
  dates
• Example of Chlorophyll a level fluctuations in
  one day
• Tidal flow interactions with Chlorophyll levels
• Two Questions
• What is effect of the added fertilizer on the on
  the phytoplankton levels?
• What role does the tidal cycle play in the daily
  Chlorophyll a levels?

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Chlorophyll a daily average comparison for
Sweeney and West

• Highest Phytoplankton levels occur in July
• Consistent pattern of Chl a levels in Sweeney
  creek being 2x the Chl a levels

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Chlorophyll a daily average Comparison for Nelson
and Clubhead

• Nelson and Clubhead show the same pattern as
  Sweeney and West but Nelson varies to between ½
  and 2/3 of Clubhead

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Example of Chlorophyll a fluctuations in day for
July 24

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Chlorophyll a levels in reference to tidal flow
for West 7/27

• High Tide occurs at 1935
• There are two peaks, the highest being an hour
  before high tide

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Chlorophyll a levels in reference to tidal flow
for West 7/24

• High Tide occurs at 1635
• Follows the pattern of a high point occurring an
  hour before high tide but the there is little to
  no second peak

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Chlorophyll a levels in reference to tidal flow
for Sweeney 7/27

• High tide occurs at 1800
• The second peak after the High tide in all three
  graphs is higher showing some sort of
  resuspension occurring

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Chlorophyll a levels in reference to tidal flow
for Sweeney 7/24

• High tide occurs at 1520
• Resuspension is still present

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Conclusions and future directions

• There is an increase in phytoplankton due to the
  fertilizer in Sweeney
• There might be an increase in resuspension due to
  the fertilizer in Sweeney
• Tidal volumes could be measured on more days to
  get more perspective on the relationship between
  the Chl a and the tidal cycle

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Acknowledgements

• Thank you to
• Linda Deegan
• Deanne Drake
• Mike Johnson,
• Chris Neil
• Christian Picard
• Bruce Peterson