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Long-term responses of aquatic macrophyte diversity and community structure to variation in nitrogen loading
Tracy, M.; Montante, J.M.; Allenson, T.E.; Hough, R.A. (2003). Long-term responses of aquatic macrophyte diversity and community structure to variation in nitrogen loading. Aquat. Bot. 77(1): 43-52. dx.doi.org/10.1016/s0304-3770(03)00071-8
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Ammonia; Aquatic plants; Biodiversity; Community composition; Droughts; Long-term changes; Nitrates; Nitrogen cycle; Population dynamics; Rainfall; Ceratophyllum demersum L. [WoRMS]; USA, Michigan, East Graham L.; USA, Michigan, Shoe L. [Marine Regions]; Fresh water

Authors  Top 
  • Tracy, M.
  • Montante, J.M.
  • Allenson, T.E.
  • Hough, R.A., correspondent

Abstract
    In a chain of small lakes in southeastern Michigan, USA, macrophyte community dynamics have shown a strong relationship to variations in nitrogen (nitrate and ammonia) loading that appear to correlate with variations in regional annual precipitation. We examined the community structures of two of these lakes 9 years after a drought in 1987-1988 which had temporarily reduced nutrient loading in the system, and during which the macrophytes in normally more eutrophic Shoe Lake had shifted from a Ceratophyllum-dominated community of low diversity to a more diverse community similar to that in less productive East Graham Lake downstream. With a return to the normal precipitation rates and associated nitrogen loading, the macrophytes in Shoe Lake returned to a community dominated by the non-rooted species Ceratophyllum demersum. However, overall species diversity remained relatively high in Shoe Lake after the drought event.

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