期刊
FRESHWATER BIOLOGY
卷 54, 期 8, 页码 1759-1773出版社
WILEY
DOI: 10.1111/j.1365-2427.2009.02222.x
关键词
benthos; latitudinal gradient; nitrogen-deposition; nutrient cycling; nutrient limitation
资金
- Oskar and Lily Lamms Minnes Foundation
- Olson Borgh's Foundation
- Knut and Alice Wallenberg's Foundation
- Swedish University of Agricultural Sciences
1. We tested whether increasing atmospheric nitrogen (N) deposition along a north-south gradient intensifies epilithic phosphorus (P) limitation in oligotrophic Swedish lakes from the north to the south. We examined the epilithic community at a shallow depth from seven northern and six southern Swedish lakes, and also compared the results with a lake located geographically between the two groups. We determined lake nutrient state, epilithic nutrient ratios and epilithic algal composition, as well as grazer N : P ratios, grazer-epilithon N : P imbalance, and N : P cycling ratios. 2. Epilithic communities appear to be generally more N-limited in the northern lakes and more P-limited in the southern lakes. Lake water total N (Tot-N) and epilithic N : P ratios were lower in northern than in southern lakes and the proportion of N2-fixing cyanobacteria was higher in northern than in southern lakes. 3. Gastropod grazers had lower N : P imbalances and cycled less N relative to P in northern than in southern lakes. 4. Atmospheric N-deposition showed a strong positive correlation with lake water Tot-N and a much weaker positive correlation with epilithon N : P ratios. Atmospheric N-deposition also correlated negatively with the proportion of N2- fixing cyanobacteria. 5. There are indications that increased atmospheric N-deposition towards the south might intensify P-limitation of epilithic algae and invertebrate grazers, although more studies are needed to show the strength and generality of our findings.
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