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Oecologia

, Volume 178, Issue 3, pp 875–885 | Cite as

Autumn leaf subsidies influence spring dynamics of freshwater plankton communities

  • Samuel B. FeyEmail author
  • Andrew N. Mertens
  • Kathryn L. Cottingham
Community ecology - Original research

Abstract

While ecologists primarily focus on the immediate impact of ecological subsidies, understanding the importance of ecological subsidies requires quantifying the long-term temporal dynamics of subsidies on recipient ecosystems. Deciduous leaf litter transferred from terrestrial to aquatic ecosystems exerts both immediate and lasting effects on stream food webs. Recently, deciduous leaf additions have also been shown to be important subsidies for planktonic food webs in ponds during autumn; however, the inter-seasonal effects of autumn leaf subsidies on planktonic food webs have not been studied. We hypothesized that autumn leaf drop will affect the spring dynamics of freshwater pond food webs by altering the availability of resources, water transparency, and the metabolic state of ponds. We created leaf-added and no-leaf-added field mesocosms in autumn 2012, allowed mesocosms to ice-over for the winter, and began sampling the physical, chemical, and biological properties of mesocosms immediately following ice-off in spring 2013. At ice-off, leaf additions reduced dissolved oxygen, elevated total phosphorus concentrations and dissolved materials, and did not alter temperature or total nitrogen. These initial abiotic effects contributed to higher bacterial densities and lower chlorophyll concentrations, but by the end of spring, the abiotic environment, chlorophyll and bacterial densities converged. By contrast, zooplankton densities diverged between treatments during the spring, with leaf additions stimulating copepods but inhibiting cladocerans. We hypothesized that these differences between zooplankton orders resulted from resource shifts following leaf additions. These results suggest that leaf subsidies can alter both the short- and long-term dynamics of planktonic food webs, and highlight the importance of fully understanding how ecological subsidies are integrated into recipient food webs.

Keywords

Terrestrial-aquatic linkages Food webs Phenology Ponds Zooplankton 

Notes

Acknowledgments

We thank A. L. Ritger, J. V. Trout-Haney, and R. L. Wood for field and laboratory assistance and S. Stokoe for management of the Dartmouth Organic Farm. Comments from J. J. Gilbert, R. O. Hall, E. T. Irwin, and two anonymous reviewers greatly improved this manuscript. An Environmental Protection Agency STAR Fellowship and James S. McDonnell Complexity Postdoctoral Fellowship to S. B. F. and National Science Foundation grants DEB-1110369 to S. B. F. and K. L. C. and EF-0842267 to K. L. C., EF-0842112 to H. A. Ewing, and EF-0842125 to K. C. Weathers funded this research.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Samuel B. Fey
    • 1
    • 2
    Email author
  • Andrew N. Mertens
    • 1
  • Kathryn L. Cottingham
    • 1
  1. 1.Department of Biological SciencesDartmouth CollegeHanoverUSA
  2. 2.Department of Ecology and Evolutionary BiologyYale UniversityNew HavenUSA

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