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Aquatic Microbial Ecology

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AME 56:113-122 (2009)  -  DOI:

Gross and net primary production: closing the gap between concepts and measurements

John Beardall1,*, Sven Ihnken1, Antonietta Quigg2

1School of Biological Sciences, Monash University, Clayton, Victoria 3800, Australia
2Departments of Marine Biology and Oceanography, Texas A & M University at Galveston, Galveston, Texas 77551, USA

ABSTRACT: We are living at a time when accurate knowledge of the magnitude of the drawdown of inorganic carbon by autotrophic metabolism is especially crucial to our understanding of global carbon cycling and the functioning of the global ecosystem. Since algae contribute approximately half of the planet’s annual primary productivity, understanding the processes contributing to the net assimilation of CO2 is critical. In this paper, we briefly discuss the range of approaches to measurements of aquatic photosynthesis that have been used, including more recent developments such as fluorescence and stable isotope studies, and whether these provide data that reflect net or gross productivity. We then consider the range of processes that run counter to photosynthetic carbon assimilation, with emphasis on respiration (and its measurement) and excretion of dissolved organic carbon, and how these affect our estimates of net primary production. We conclude by briefly assessing how future changes in global climate might impact not just overall primary productivity, but also the balance between net and gross carbon assimilation.

KEY WORDS: Primary productivity · Photosynthesis · Respiration · Algae · Protein turnover · Homeostasis · Fluorescence

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Cite this article as: Beardall J, Ihnken S, Quigg A (2009) Gross and net primary production: closing the gap between concepts and measurements. Aquat Microb Ecol 56:113-122.

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