We carried out a study of the spatial and temporal effects of land-derived material on water column nutrients and plankton dynamics in a subtropical estuary. The study had 2 parts: (1) a 3 yr synoptic monitoring program, and (2) a shorter 1.5 yr study during the second half of the program, which focused on individual pulses driven by discrete rainfall events. Although we found spatial differenc...

Food-web population models are rather sensitive to parameterization of functional response in predation terms. Theoretical studies predict enhancing of ecosystems' stability for a functional response of sigmoid type (Holling type III). The choice of a correct type of response is especially important for modelling outcome of grazing control of algal blooms by zooplankton in nutrient-rich ecosyst...

Scientific datasets are often difficult to analyse or visualize, due to their large size and high dimensionality. We propose a twostep approach to address this problem. We begin by using data mining algorithms to identify areas of interest within the dataset. This allows us to reduce a dataset’s size and dimensionality, and to estimate missing values or correct erroneous entries. We display the...

Contemporary insights from evolutionary ecology suggest that population divergence in ecologically important traits within predators can generate diversifying ecological selection on local community structure. Many studies acknowledging these effects of intraspecific variation assume that local populations are situated in communities that are unconnected to similar communities within a shared r...

The use of riverine allochthonous organic matter by plankton in the northern Baltic Sea was studied using stable isotopes of carbon and nitrogen. Dissolved and particulate material was sampled in the main Swedish rivers entering the Bothnian Bay and the Bothnian Sea. At 4 sea stations, dissolved matter, plankton and nekton were sampled in l l size-classes: below 0.7 pm filtrate, 0.7-5, 5-20, 20...

The distance at which plankters can detect and thus interact with each other depends on their sensitivity, size, and motion, as well as the hydrodynamic characteristics of their behaviour. Through a simple consideration of the distribution of forces exerted on the ambient fluid by different plankton behaviours, it is possible to deduce the spatial scale over which the associated hydromechanical...

Red-billed gulls (Lams scupzdinus) and southern black-backed gulls (Lams dominicams) exploited a large and highly visible food source provided by beaching of euphausiids (Nyctiphanes australis) and galatheid crab larvae (Munida gregaria) in Otago Harbor. The plankton strandings occurred predominantly in summer, and provided a food source of -270 t dry weigh1 over 170 d along 12 km of shoreline....

Direct observations were used to study feeding by Daphnia longiremis Sars in the Kurile Lake (South Kamchatka) terms of structural transformation phytoplankton 2008. Spectrum daphnia’s food reflects transformations species structure. Daphnia’s consumption intensity phytoplankton, where 99.8% diatom cells, depends on biomass. It is suggested, that daphnias meet deficient when values (plankton di...

Mixotrophs are important components of the bacterioplankton, phytoplankton, microzooplankton, and (sometimes) zooplankton in coastal and oceanic waters. Bacterivory among the phytoplankton may be important for alleviating inorganic nutrient stress and may increase primary production in oligotrophic waters. Mixotrophic phytoflagellates and dinoflagellates are often dominant components of the pla...