Vertical distribution and abundance of aquatic macrophytes in Lake Waikaremoana
By: Howard-Williams, C.
Contributor(s): Davies, J. (DSIR, Division of Marine and Freshwater Science, Taupo Research Laboratory. Taupo) | Vincent, W.F. (DSIR, Division of Marine and Freshwater Science, Taupo Research Laboratory. Taupo) | DSIR, Division of Marine and Freshwater Science, Taupo Research Laboratory. Taupo.Material type: BookSeries: Taupo Research Laboratory report: no. 107Publisher: Taupo, N.Z. : Taupo Research Laboratory, 1989Description: 30 leaves (various pagings) : illustrations (figures, graphs) ; 30 cm.Report number: TRL-R--107Subject(s): MACROPHYTES | LAKE WAIKAREMOANA | VERTICAL DISTRIBUTION | LIMNOLOGY | NEW ZEALAND | LAKES | LIGHT PENETRATION | RADIANT ENERGY | SEASONAL VARIATIONS | WATER LEVELS | LITTORAL ZONE
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|JOURNAL||WELLINGTON STACK||STACK NO. 107 1989||1||Available||J016714|
30 refs; 4 plates; 13 figs; 2 tables; 2 appendices. This report is provisional and should not be quoted without consulting the author or Director
Factors affecting the lower depth limit (Z/sub c/) of macrophytes are reviewed in relation to environmental conditions in Lake Waikaremoana. It is concluded that Z/sub c/ is determined by the distribution of radiant energy but that there is a threshold effect at Z/sub c/ which causes a sharp cutoff of growth. Such a threshold may be caused by a growth trigger affected by light quality or by a light compensation effect at the seasonal minimum solar radiation period. The macrophyte assemblage in Lake Waikaremoana appears to be markedly resilient to short term (i.e. months) changes in water level, with associated changes in the light regime. Thus occasional low or high water periods have little long term effect on littoral vegetation. The persistance of Z/sub c/ at the same position over periods of up to 5 years in Lake Waikaremoana suggest that only long term changes in the light field in the littoral zone here will affect littoral production