PCR-denaturing gradient gel electrophoresis (DGGE) and canonical correspondence analysis (CCA) were used to explore the relationship between eukaryotic plankton community succession and environmental factors in two aquaculture pond models with gibel carp Carassius auratus gibelio. The main culture species of pond 1 were gibel carp and grass carp, and the combined density was 46224 fingerling/ha...

Enterococci are used to evaluate recreational-water quality and health risks in marine environments. In addition to their occurrence in feces of warm blooded animals, they are also common epiphytes. We investigated the contribution of plankton- or particle-associated enterococci in estuarine and coastal water. Seven water and size-fractionated plankton samples were collected monthly between Apr...

Four feeding levels (40%, 60%, 80% and 100% of satiation) were designed as the different treatment groups to assess its effects on water quality and plankton community structure in the yellow catfish rearing enclosure ecosystem. The results showed that the weight gain and specific growth rate decreased significantly as the feeding level decreased. The soluble nutrients (except for NO2-N) concen...

A visual segmentation mechanism for a connectionist pattern recognition system is sought. However, to find such a device requires the solution of the dynamic binding problem. Visual segmentation could be learned by a dynamic binding network. Several puta-tive dynamic binding mechanisms are discussed but each is found to have weaknesses. Two mechanisms are being studied in greater depth so that ...

Human norovirus (NoV) has been studied extensively as an important cause of gastroenteritis outbreaks worldwide. While oysters are a primary vehicle for infection, few studies have examined the wider distribution of NoV in the estuarine environment. Active shellfish-harvesting areas in Georgia were examined for the prevalence, genotype diversity, and concentrations of NoV in a variety of estuar...

I use numerical and analytical techniques to study the dynamics of various models of plankton food webs with and without resource fluctuations. Plankton are ideal organisms because they are very small, fast-reproducing organisms so they can easily be used in laboratory experiments to verify any results. We can study simple food webs to develop a better understanding of more complex food webs. T...

Long-term changes in the seasonal timing of phytoplankton and zooplankton population development (i.e. phenological changes) have been widely reported in freshwater and marine ecosystems, and have been interpreted as a biological response to ongoing climate change. Observed among-species variations in the rates and patterns of these changes have led to concerns that seasonal trophic interaction...

During the 1980s, the North Sea plankton community underwent a well-documented ecosystem regime shift, including both spatial changes (northward species range shifts) and temporal changes (increases in the total abundances of warmer water species). This regime shift has been attributed to climate change. Plankton provide a link between climate and higher trophic-level organisms, which can forag...

Plankton is an important food item of fishes and indicator for the productivity of a water body. The present study was conducted to evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture pond. The experiment was carried out using three treatments, i.e., ponds bottom with sandy loam (T1), with loam (T2) and with clay loam (T3). The ranges of water quality...