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    Author(s): J.L. Tank; P.J. Mulholland; J.L. Meyer; W.B. Bowden; J.R. Webster; B.J. Peterson
    Date: 2000
    Source: Verh. Internat. Verein. Limnol., Vol. 27: 2832-2835
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (725 KB)

    Description

    Nitrogen is a critical element controlling the productivity and dynamics of stream ecosystems and many streams are limited by the supply of biologically available nitrogen (e.g. Grimm & Fisher 1986, Lohman et al. 1991). We are learning more about the fate of inorganic nitrogen entering streams through 15N tracer additions (Peterson et al. 1997). The Lotic Intersite Nitrogen eXperiment (LINX) is studying the uptake, cycling, and fate of 15N-NH4 in the stream food web of 10 streams draining different biomes. Using the 15N tracer method and data from three sites in the study, w can differentiate patterns in the cycling of nitrogen through the grazing pathway (N from the epilithon to grazing macroinvertebrates) for three temperate forested streams. Here, we quantify the relationship between the dominant grazer and its proposed food resource, epilithon, by comparing 15N levels of grazers with those of the epilithon, as well as the biomass, nitrogen content, and chlorophyll a standing stocks of the epilithon in three streams.

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    Citation

    Tank, J.L.; Mulholland, P.J.; Meyer, J.L.; Bowden, W.B.; Webster, J.R.; Peterson, B.J. 2000. Contrasting food web linkages for the grazing pathway in three temperate forested streams using 15N as a tracer. Verh. Internat. Verein. Limnol., Vol. 27: 2832-2835

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