{"refrec":{"BRefID":59093,"RR":"<b>Tracy, M.; Montante, J.M.; Allenson, T.E.; Hough, R.A.</b> (2003). Long-term responses of aquatic macrophyte diversity and community structure to variation in nitrogen loading. <i>Aquat. Bot. 77(1)</i>: 43-52. <a href=\"http://dx.doi.org/10.1016/s0304-3770(03)00071-8\" target=\"_blank\">http://dx.doi.org/10.1016/s0304-3770(03)00071-8</a>","BEntID":56688,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Bot. 77(1)</i>: 43-52. <a href=\"https://dx.doi.org/10.1016/s0304-3770(03)00071-8\" target=\"_blank\">https://dx.doi.org/10.1016/s0304-3770(03)00071-8</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Tracy, M.; Montante, J.M.; Allenson, T.E.; Hough, R.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Tracy, M. <i>et al.</i>","Englishabstract":"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 <i>Ceratophyllum</i>-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 <i>Ceratophyllum demersum</i>. 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