Phytoplankton responses to nitrogen and phosphorus enrichment in unproductive Swedish lakes along a gradient of atmospheric nitrogen deposition. Bergstroem, A., Jonsson, A., & Jansson, M. Aquatic Biology, 4(1):55–64, 2008. 00000
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Lake sampling and in situ nutrient enrichment enclosure experiments with nitrogen (N) and phosphorus (P) were conducted in unproductive Swedish lakes along a gradient of increasing atmospheric N-deposition. The regional and seasonal patterns of nutrient limitation of phytoplankton were clearly related to the amounts of N-deposition and N-inputs the lakes received. In areas of low N-deposition in northern Sweden, N-limitation of phytoplankton was evident throughout the summer season due to high catchment N-retention and very low dissolved inorganic N (DIN) inputs during the early summer. High N-deposition in the south was accompanied by high lake DIN-concentrations during the early summer and subsequent P-limitation of phytoplankton. However, P-limitation did not persist over the summer and, as a consequence of a declining DIN-pool, the lakes switched to dual- and co-limitation by N and P, and then to N-limitation. Generally, the lakes were N-limited rather than P-limited during the summer. We conclude that N-limitation is probably a natural state of the unproductive lakes studied, but P-limitation of variable intensity and duration has been induced by elevated atmospheric N-deposition.
@article{bergstroem_phytoplankton_2008,
	title = {Phytoplankton responses to nitrogen and phosphorus enrichment in unproductive {Swedish} lakes along a gradient of atmospheric nitrogen deposition},
	volume = {4},
	issn = {1864-7790},
	doi = {10.3354/ab00099},
	abstract = {Lake sampling and in situ nutrient enrichment enclosure experiments with nitrogen (N) and phosphorus (P) were conducted in unproductive Swedish lakes along a gradient of increasing atmospheric N-deposition. The regional and seasonal patterns of nutrient limitation of phytoplankton were clearly related to the amounts of N-deposition and N-inputs the lakes received. In areas of low N-deposition in northern Sweden, N-limitation of phytoplankton was evident throughout the summer season due to high catchment N-retention and very low dissolved inorganic N (DIN) inputs during the early summer. High N-deposition in the south was accompanied by high lake DIN-concentrations during the early summer and subsequent P-limitation of phytoplankton. However, P-limitation did not persist over the summer and, as a consequence of a declining DIN-pool, the lakes switched to dual- and co-limitation by N and P, and then to N-limitation. Generally, the lakes were N-limited rather than P-limited during the summer. We conclude that N-limitation is probably a natural state of the unproductive lakes studied, but P-limitation of variable intensity and duration has been induced by elevated atmospheric N-deposition.},
	language = {English},
	number = {1},
	journal = {Aquatic Biology},
	author = {Bergstroem, Ann-Kristin and Jonsson, Anders and Jansson, Mats},
	year = {2008},
	note = {00000},
	keywords = {\#nosource, Ecosystems, N-deposition, N-limitation, P-limitation, Seasonal   variation, bacterioplankton, climate, colorado front range, eutrophication, growth, lakes, marine, nutrient limitation, nutrients, organic-carbon, ortrasket, phytoplankton},
	pages = {55--64},
}

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