Rotifer peck biomass varied from 25.72 to 73.20 mg·L -1 , with an average of 45±13.53 mg·L -1 . The peak period lasted more than 15 days in the experimental ponds corresponded with the curve of logistic equilibrium and was negativly correlated with phytoplankton biomass in ponds (n=12-13.r>-0.60).
The training sample, valid sample and test sample were developed, taking data of 26 sample plots from May to October of 2001 as input indicators and phytoplankton biomass of each sample site as output factor.
On the basis of HAMSOM, a three-dimensional dynamical NPZD model for the Bohai Sea plankton ecosystem is constructed with phytoplankton biomass(P), zooplankton biomass(Z), nitrite, phosphate(N) and detritus(D) as the state variables.
On an average, the biomass of plankton is 4.5247mg/L, in which phytoplankton's is 3.0606mg/L──Bacillariophyta, Euglenophyta and Chlrophyta predominate,the biomass of zooplankton is 1.4641mg/L.
The results showed that the biomass of phytoplankton of all five ponds, ranging from 51.87 mg/L to 88.71mg/L, were within the suitable range of the fertility of water.
(2) In May, this phenomenon disappears whereas the phytoplankton diversities and the ratios of coefficient of variability (CV) of zooplankton in April and May and the CV of phytoplankton have a significant negative-correlation with the FP (p<0.01, p<0.07, p<0.02).
The biomass of phytoplnkto. n, zooplankton and zoobenthos are 17.6 mg/1,3,1 mg/1 and 4.1 g/m2 respectively, among which Cyanophyta, Euglenophyta, Copeooda and Chirono-mid larvae arc predominated.
But whether the density was high or not, the ratio of N/P and the amount of the phytoplankton in the culture water were all large, which showed that in this ecological system, there was a wide range in the adaptability of phytoplankton when the contents of nutrient salts varied.
Throughout the observation period, from July to October, high values of phytoplankton biomass were recorded in the Gulf of Ob and adjacent areas of the Ob-Yenisei shoal.
Experiments in Chistye Prudy pond in the period of blue-green algae blooming show large-size zooplankton to reduce phytoplankton biomass in the pond throughout the period of phytoplankton growth.
Cladoceras Simocephalus vetulus with a biomass of 1.6 g/l in flow-through ecosystems isolated from ichthyifauna can reduce phytoplankton biomass from 2.89 to 0.12 mg/l within 1 h.
In the period when phytoplankton biomass in the water body was at maximum, the activity of cladoceras (biomass of 2.1 g/l) resulted in a decrease in this biomass in flow-through ecosystems by a factor of 13.6 (down to 0.34 mg/l).
The decrease in phytoplankton biomass in flow-through ecosystems facilitated changes in its composition in the water body (an increase in the share of green algae) and was accompanied by an increase in water transparency.
Gangdong is located at the northeast foot of the mountain Laoshan. The water along its coast is of the open-water type and the range of depth is from 3 to 6 meters. The sediment of the southern part of this area is mud-sand and that of the northern part is mud-gravel. In this area water is infertile and its N-content nearly equal to zero. Phytoplankton and large algae are very rare and only several species of brown algae, such as Sargassum pallidum, Sargassum sp. and Scytosiphon sp. present in small quantit...
The correlation of growth and development of silver carp (Hypophthalmichthys molitrix) with the composition and biomass of phytoplankton has been studies in the fishponds.It shows that silver carp grows bad in water dominated by blue green algae, such as Merismopedia. Chroococcus. Dactylococcopsis. Microcystis and other u-algae, with the exception of Anabaenopsis, which is found to be the most effective food for this fish.When Cryptomonas and other flagellate algae dominate in pond water silver carp also gr...
This paper embodies the results of observations on the plankton in eight fish pondsin Heliekou, Wuxi shi and three fish ponds in Wuli hu fish farm during the growingseason in 1977. Samples were collected at 5-7 days intervals from four main pondsand at semi-month intervals from seven ordinary ponds.The biomass of phytoplankton determined by the method of calculating cell volumegenerally varies between 20--100mg/L, in which the flagellate algae were predomina-ted and Cyanophyte was rare.The average biomass o...
浮游植物量
phytoplankton biomass
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