Original paper
A biomanipulation experiment in Green Lake, Seattle, Washington
Goad, Julie A.
Archiv für Hydrobiologie Volume 102 Number 2 (1984), p. 137 - 153
29 references
published: Dec 11, 1984
DOI: 10.1127/archiv-hydrobiol/102/1984/137
ArtNo. ESP141010202000, Price: 29.00 €
Abstract
The effects of planktivorous fish on the zooplankton and phytoplankton communities in Green Lake were examined using three enclosures containing fish and one enclosure without fish. The enclosures containing fish had less zooplankton (as much as an 80 % reduction), greater concentrations of chlorophyll (as much as a 160 % increase), and alterations in the composition of both zooplankton and phytoplankton populations. The enclosure without fish had a higher abundance of zooplankton and generally a lower phytoplankton biomass. The results of the manipulations varied according to the stocking rate and the type of fish in the enclosures. The highest density of perch (1500kg/ha) showed the greatest effect. Biomanipulation is a feasible approach to the restoration of Green Lake if conducted with discretion.
Keywords
biomanipulation • phytoplankton • enclosures • Green Lake • Seattle • Washington