Aquatic Sciences

, Volume 76, Issue 4, pp 483–495

Denitrification in a Laurentian Great Lakes coastal wetland invaded by hybrid cattail (Typha × glauca)

  • Shane C. Lishawa
  • KathiJo Jankowski
  • Pamela Geddes
  • Daniel J. Larkin
  • Andrew M. Monks
  • Nancy C. Tuchman
Research Article

DOI: 10.1007/s00027-014-0348-5

Cite this article as:
Lishawa, S.C., Jankowski, K., Geddes, P. et al. Aquat Sci (2014) 76: 483. doi:10.1007/s00027-014-0348-5

Abstract

Wetland ecosystems maintain and improve water quality through the process of denitrification, an increasingly important ecosystem service due to global N pollution. Invasive plants have the potential to disrupt denitrification by altering the environmental conditions that facilitate this process. Great Lakes coastal wetlands are experiencing widespread invasion by highly productive hybrid cattail with largely uncertain biogeochemical effects. Through field and controlled mesocosm studies, we sought to determine the effects of cattail invasion through time on denitrification rates and associated environmental factors in a Great Lakes coastal wetland. In the field, we found that cattail density correlated with increased denitrification and a suite of environmental and plant community characteristics and denitrification rates were positively correlated with NH4+, sediment organic matter, reduced water levels, and cattail stand age. Through our controlled mesocosm study, we documented conditions 1- and 5-year following invasion and found that denitrification rates and soil organic matter increased in year 5, and cattail and year-since-invasion altered plant communities and soil NH4+. Only a weak correlation between denitrification rates and cattail treatments was noted, however, owing to high replicate variability. Our results indicate that with increasing cattail residence time, one ecosystem service, biodiversity, was negatively impacted, while two other services, denitrification and sediment carbon accumulation, were enhanced. Thus, this highly invaded wetland still provides valuable services to aquatic ecosystems and to society. A holistic perspective is therefore critical when evaluating invasive species impacts in which negative impacts are weighed against other ecosystem services, which may be stimulated.

Keywords

Denitrification Invasive species Temporal Aquatic macrophyte Ecosystem service Typha × glauca 

Copyright information

© Springer Basel 2014

Authors and Affiliations

  • Shane C. Lishawa
    • 1
    • 2
  • KathiJo Jankowski
    • 1
    • 3
  • Pamela Geddes
    • 1
    • 4
  • Daniel J. Larkin
    • 1
    • 5
  • Andrew M. Monks
    • 1
    • 2
  • Nancy C. Tuchman
    • 1
    • 2
  1. 1.Institute of Environmental SustainabilityLoyola University ChicagoChicagoUSA
  2. 2.University of Michigan Biological StationPellstonUSA
  3. 3.School of Aquatic and Fishery SciencesUniversity of WashingtonSeattleUSA
  4. 4.Department of BiologyNortheastern Illinois UniversityChicagoUSA
  5. 5.Chicago Botanic Garden, Plant Science and ConservationGlencoeUSA

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