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Estuaries and Coasts

, Volume 33, Issue 2, pp 485–497 | Cite as

Phytoplankton Community Indicators of Short- and Long-term Ecological Change in the Anthropogenically and Climatically Impacted Neuse River Estuary, North Carolina, USA

  • Hans W. PaerlEmail author
  • Karen L. Rossignol
  • S. Nathan Hall
  • Benjamin L. Peierls
  • Michael S. Wetz
Article

Abstract

Estuarine and coastal systems represent a challenge when it comes to determining the causes of ecological change because human and natural perturbations often interact. Phytoplankton biomass (chlorophyll a) and group-specific photopigment indicators were examined from 1994 to 2007 to assess community responses to nutrient and climatic perturbations in the Neuse River Estuary, NC. This system experienced nutrient enrichment and hydrologic variability, including droughts, and an increase in hurricanes. Freshwater input strongly interacted with supplies of the limiting nutrient nitrogen (N) and temperature to determine the location, magnitude, and composition of phytoplankton biomass. Multi-annual, seasonal, and episodic hydrologic perturbations, including changes in the frequency and intensity of tropical storms, hurricanes and droughts, caused significant shifts in phytoplankton community structure. Climatic oscillations can at times overwhelm anthropogenic nutrient inputs in terms of controlling algal bloom thresholds, duration, and spatial extent. Eutrophication models should incorporate climatically driven changes to better predict phytoplankton community responses to nutrient inputs and other anthropogenic perturbations.

Keywords

Phytoplankton Estuary Ecological change Climate Nutrients Photopigments 

Notes

Acknowledgements

We appreciate the assistance of A. Joyner, P. Wyrick, and J. Braddy with field support, data analysis, and illustrations. This work was supported by the North Carolina Department of Environment and Natural Resources (ModMon and FerryMon Programs, 319 Nonpoint Source Management Program), the North Carolina Sea Grant Program, the U.S. EPA–STAR–EaGLe Program, the National Science Foundation, Ecology, Environmental Engineering and Technology, the National Science Foundation Biological Oceanography Program, and Ecology of Infectious Diseases Programs.

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Copyright information

© Coastal and Estuarine Research Federation 2009

Authors and Affiliations

  • Hans W. Paerl
    • 1
    Email author
  • Karen L. Rossignol
    • 1
  • S. Nathan Hall
    • 1
  • Benjamin L. Peierls
    • 1
  • Michael S. Wetz
    • 2
  1. 1.Institute of Marine SciencesUniversity of North Carolina at Chapel HillMorehead CityUSA
  2. 2.Department of OceanographyFlorida State UniversityTallahasseeUSA

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