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The Life History and Occurrence of Sialis lutaria L. (Megaloptera) in the Littoral Zone of Lake Esrom, Denmark

1989; Wiley; Volume: 74; Issue: 3 Linguagem: Inglês

10.1002/iroh.19890740305

0020-9309

Peter Dall,

Fish Ecology and Management Studies

Abstract The life history and distribution of Sialis lutaria L. in the exposed littoral zone of Lake Esrom, Denmark were examined during 1979/80. Sialis showed an annual life cycle with mean annual abundance of 20 and 40 ind m −2 at 0.4 and 2.0 m depth, respectively. Growth peaked during July with rates of about 10 % d −1 . Net annual production averaged 0.2 g DW at 0.4 m depth and 0.8 g DW at 2.0 m depth. The annual P/B‐ratios were estimated in the range of 4.6‐7.1.