Graduation Year

2004

Document Type

Thesis

Degree

M.S.

Degree Granting Department

Biology

Major Professor

Thomas, Florence I. M.

Keywords

Photosystem II kinematics, PAM fluorescence, Hydrodynamics, Primary production, Boundary layers

Abstract

The delivery of nutrients to the surface of marine algae can be controlled by the local hydrodynamic regime: in higher flow velocities, the Diffusive Boundary Layer (DBL) at the uptake surface is thinner, which can increase the flux of dissolved chemicals to the algal surface. If the primary productivity of an alga is controlled by the availability of a dissolved chemical, increased water flow should result in greater primary productivity due to increased chemical flux. To test the hypothesis that increased water flow will increase Photosystem II kinematics (PSII) in the green alga Caulerpa we used a Diving Pam Fluorometer to measure the maximum relative electron transport rate (Pmax), Saturation Irradiance (Ik), Non-photochemical quenching (NPQ), the light limited slope of photosynthesis vs. irradiance curve (a) and photo-chemical quenching (qP) and compared these measured values among treatments of varying flow speeds in a portable laboratory flume.

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