Titlebook: Biomanipulation Tool for Water Management; Proceedings of an In Ramesh D. Gulati,Eddy H. R. R. Lammens,Ellen Donk Conference proceedings 19

cardiovascular

Sebastian Pranz,Christian Sauera dominance of planktivorous fish. In order to improve lake water quality by means of biomanipulation, a total of 2.5 tons of bream (.)and roach (.)was removed during 1986 and the spring of 1987. The planktivorous/benthivorous fish biomass was thereby reduced by approximately 50%, from 30 to 15 g WW

强制令

Hyperplasia

Figate

abreast

Are blue-green algae a suitable food for zooplankton? An overviewen widely investigated by many authors with contrasting and inconclusive results. Two main factors seem to play important role in determining their suitability as food: the biochemical properties of the different species, or even different strains of the same species; and the shape and size of the c

恶意

Analysis of phytoplankton-zooplankton relationships in an oligotrophic lake under natural and maniputh rate increased with zooplankton concentration, causing a net increase in the phytoplankton growth, a stimulatory effect probably through nutrient regeneration that overrides the losses due to grazing.

biopsy

Biomanipulation by introduction of herbivorous zooplankton. A helpful shock for eutrophic lakes?ividuals of . (0.6 ind. 1.) were introduced at the beginning of August. The daphnids soon increased 60-fold in their density causing a persistently high water transparency and low phytoplankton biomass up to November. Ammonia concentration rose steeply, whereas that of nitrate and oxygen decreased.

厚颜

Enteropathic

Why do cladocerans fail to control algal blooms?xperimental data on four differently-sized . species are used in an attempt to (1) explain why cladocerans fail to control filamentous cyanobacteria when filament density is high, and (2) determine the critical filament density at which . becomes ineffective. At this critical concentration, . growth

boisterous

Structural and grazing responses of zooplankton community to biomanipulation of some Dutch water bod (150 .m) and zooplankton indicated a Monod type relationship, with an initial part of the curve in which the zooplankton responds linearly to the seston increase up to about .. 2 mg C l., followed by a saturation of zooplankton mass (0.39 mg C l.) at 3–4 mg C l. seston, and an inhibitory effect on