Influence of Food Web Structure on Carbon Exchange Between Lakes and the Atmosphere

Author:

Schindler Daniel E.12,Carpenter Stephen R.12,Cole Jonathan J.12,Kitchell James F.12,Pace Michael L.12

Affiliation:

1. D. E. Schindler, S. R. Carpenter, J. F. Kitchell, Center for Limnology, 680 North Park Street, Madison, WI 53706, USA.

2. J. J. Cole and M. L. Pace, Institute for Ecosystem Studies, Cary Arboretum, Millbrook, NY 12545, USA.

Abstract

Top predators and nutrient loading in lakes were manipulated to assess the influence of food web structure on carbon flux between lakes and the atmosphere. Nutrient enrichment increased primary production, causing lakes to become net sinks for atmospheric carbon (C atm ). Changes in top predators caused shifts in grazers. At identical nutrient loading, C atm invasion was greater to a lake with low grazing than to one with high grazing. Carbon stable-isotope distributions corroborated the drawdown of lake carbon dioxide and traced C atm transfer from algae to top predators. Thus, top predators altered ecosystem carbon fixation and linkages to the atmosphere.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference42 articles.

1. Arctic Lakes and Streams as Gas Conduits to the Atmosphere: Implications for Tundra Carbon Budgets

2. ___ Hydrobiologia 240 23 (1992).

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4. Schindler D. W., Brunskill G. J., Emerson S., Broecker W. S., Peng T. H., ibid. 177, 1192 (1972);

5. . Fertilization of a tundra river increased the importance of autotrophic production relative to heterotrophic production but did not change CO 2 fugacity [B. J. Peterson et al. ibid. 229 1383 (1985)].

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