2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/05/2017  |   12:00 PM - 12:15 PM   |  LEAF LITTER BREAKDOWN IN LAKES: VARIABLE EFFECTS OF MACROINVERTEBRATES IN LAKES FROM ACROSS ONTARIO, CANADA   |  306B

LEAF LITTER BREAKDOWN IN LAKES: VARIABLE EFFECTS OF MACROINVERTEBRATES IN LAKES FROM ACROSS ONTARIO, CANADA

Although considerable quantities of leaf detritus can be added to forested lakes, the processing of this material in lake ecosystems has received less study than that in streams and rivers. Here we assessed the role of macroinvertebrates in the breakdown of allochthonous plant detritus in lake ecosystems that vary in nutrients and temperature. We measured breakdown rates of trembling aspen leaves (Populus tremuloides) over 60-70 days in 16 lakes along a gradient of temperature and phosphorus concentrations located in four lake regions (Kawartha Highlands, Kawartha Lakes, Dorset Lakes, Experimental Lakes Area) of Ontario, Canada. We found substantial differences in leaf breakdown among regions with much faster rates seen in more nutrient-rich and warmer lakes. While macroinvertebrates increased decomposition rates, their effects were relatively small compared to those produced by regional differences in nutrients and temperature. While there were regional differences in detrital stoichiometry, we found little effect of lake nutrients or temperature on the ratios of released nutrients. Variable rates of leaf breakdown as shown here indicate that changes in lake trophic state, temperature and/or invertebrates all likely have significant effects on this important external carbon input in lakes ecosystems.

  • C31 Organic Matter Processing
  • C03 Invertebrates
  • S19 Elements and energy as fundamental currencies of nature: using ecological stoichiometry as a tool to advance the sustainability of freshwater ecosystems

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Presenters/Authors

Sherri DeGasparro (), Trent University, Peterborough, Ontario, Canada, sherridegasparro@trentu.ca;


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David Beresford (), Trent University, Peterborough, Ontario, Canada, davidberesford@trentu.ca;


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Paul C. Frost (), Trent University, Peterborough, Ontario, Canada, paulfrost@trentu.ca;


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