Journal
JOURNAL OF PLANKTON RESEARCH
Volume 37, Issue 3, Pages 489-499Publisher
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbv018
Keywords
nutrient limitation; dissolved organic matter; bioavailability; bacterioplankton production; phytoplankton primary production; basal resource stoichiometry
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Funding
- Crafoord Foundation [20120626]
- KSLA [H13-0020-GBN]
- Helge Ax:son Johnson's Foundation [140622]
- Multistressor strong research environment - FORMAS [217-2010-126]
- FORMAS strong research environment grant [230-2010-67]
- Multistressor
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Research on nutrient controls of planktonic productivity tends to focus on a few standard fractions of inorganic or total nitrogen (N) and phosphorus (P). However, there is a wide range in the degree to which land-derived dissolved organic nutrients can be assimilated by biota. Thus, in systems where such fractions form a majority of the macronutrient resource pool, including many boreal inland waters and estuaries, our understanding of bacterio-and phytoplankton production dynamics remains limited. To adequately predict aquatic productivity in a changing environment, improved standard methods are needed for determining the sizes of active (bioavailable) pools of N, P and organic carbon (C). A synthesis of current knowledge suggests that variation in the C:N:P stoichiometry of bioavailable resources is associated with diverse processes that differentially influence the individual elements across space and time. Due to a generally increasing organic nutrient bioavailability from C to N to P, we hypothesize that the C:N and N:P of bulk resources often vastly overestimates the corresponding ratios of bioavailable resources. It is further proposed that basal planktonic production is regulated by variation in the source, magnitude and timing of terrestrial runoff, through processes that have so far been poorly described.
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