No abstract

No abstract

A limestone outcrop along the north shore of Lake Waccamnw, North Carolina, is foiind to cont.airi ca. 0.1 yo phosphate by weight,. Weathering proc s have probably driven steady inputs of phosphate from this soiircc throughout the lake's history, iLccounting for its near eutrophic state. The sediments of 1,iike \\'iiccimaw are enriched with phosphate, particnlarly in the littoral zone near the outcrop. Chemicd and biological processes apparently remove phosphate from solution rapidly, making detection of it soluhlc phosphate signal near the outcrop difficiilt. Managemcnt of niitricnt inputs and wrtcr qnality in Lake \Vl'ucciunaw requires consideration of the effects of this in-lake source of phosphate. Other sources of phosphate, partjicularly in the lake's drainiige basin, niity be less important than previously thonght.