Production and population dynamics of Leptodiaptomus sicilis in a mountain lake in Alberta, Canada
Autor: | R. Stewart Anderson, David W. Mayhood, Alois Herzig |
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Rok vydání: | 1980 |
Předmět: | |
Zdroj: | Ecography. 3:50-63 |
ISSN: | 1600-0587 0906-7590 |
Popis: | Leptodiaptomus sicilis (S. A. Forbes 1882) in Pyramid Lake, Alberta, Canada, has only one main generation per year. A small summer generation probably does not survive. Adults may persist for 7 to 12 months, and individual copepods may live for up to 17 months. Retardation of the development of copepodid C4 and C 5 seems to be food linked. The high percentage of survivors (up to 97%) from the first egg pulse of the main generation, and the low percentage of survivors (as low as 3%) from the second egg pulse, is likely due to the absence of cyclopoid adults and copepodids in spring, and to both cyclopoid predation and a poor food regime in summer. Production estimates by several methods gave closely comparable results. Mean daily production by L. sicilis is 0.29 mg dry weight m-3, and the annual P/B ratio is 2.63. |
Databáze: | OpenAIRE |
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