The measurement and distribution of living microscopic plant matter, commonly referred to as phytoplankton or algae, has been of interest to scientists, researchers, and aquatic resource managers for decades. An understanding of phytoplankton populations and their distribution enables researchers to draw conclusions about an aquatic system's health, composition, and ecological status. 

Phytoplankton populations are typically estimated by measuring chlorophyll a, the primary photosynthetic pigment present in all forms of algae. Currently, chlorophyll can be estimated in lakes, rivers, reservoirs, and coastal and open ocean waters across the globe.

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Algae Management in Reservoirs and Lakes
Non-Acidification Technique for Extracted Chlorophyll a Analysis
Chlorophyll Non-Acidification Method (Welschmeyer)
Chlorophyll and Pheophytin
In Vivo Chlorophyll: Concepts & Concerns
In Vivo Chlorophyll Detection Using Red Excitation
An In-vivo Chlorophyll Procedure for the 10AU Field & Laboratory Fluorometer
(10AU) A procedure for measuring extracted chlorophyll a free from the errors associated with chlorophyll b and pheopigments

Chlorophyll Measurements with the 10AU Fluorometer
Chlorophyll Measurement Reference List 

Technical Note: New Tools & Accessories for Monitoring Algal Growth in Test Tubes