The uptake of resources from the environment is a vital process for all organisms. Many experimental studies have revealed that the rate at which this process occurs depends critically on the resource concentration, a relationship called ‘‘functional response.’’ However, whether the concentration of the consumer normally affects the functional response has been the subject of a long-standing, p...

Ostreococcus spp. are extremely small unicellular eukaryotic green algae found worldwide in marine environments, and they are susceptible to attacks by a diverse group of large DNA viruses. Several biologically distinct species of Ostreococcus are known and differ in the ecological niches that they occupy: while O. tauri (representing clade C strains) is found in marine lagoons and coastal seas...

The occurrence of three species belonging to the small coenobia forming green algae Desmodesmus and Didymocystis is reported from northernmost part Lake Tanganyika, East Africa. During a monitoring between September 2011 October 2013 highest number cells bicellularis comasii were observed in August September, at end dry season. On other hand, third taxon, cf. inermis , was only sporadically Mar...

The first data about the algae flora of water bodies “Aschisayskaya Steppe” plot State Nature Reserve “Orenburgsky” are presented. 217 species and intraspecies taxa microalgae belonging to phyla Chlorophyta, Euglenozoa, Bacillariophyta, Ochrophyta, Streptophyta, Miozoa Cyanobacteria were found in five reservoirs plot. New for territory Orenburg Region, as well rare Russia noted, their character...

Biomass waste products from green algae have recently been given new life, as these polysaccharides have potential applications in industry, agriculture, and medicine. One such polysaccharide group called ulvans displays many different, potentially useful properties that arise from their structural versatility. Hence, performing structural analyses on ulvan is crucial for future applications. H...

Though their broad distribution in most Brazilian rivers, scarce studies concerning ecological interactions on Hypostomus species are available. This study observes the diet, the trophic interactions and some morphological aspects of four syntopic species of Hypostomus. These fishes were studied at the superior part of the Corumbataí river, at São Paulo state, southeastern Brazil. Analyses focu...

A materially-closed aquatic ecosystem (microcosm) was developed. The microcosm contained two families of green algae and blue-green alga as primary producers, protozoa, two species of rotifers and oligochaetes as consumers, and bacteria as decomposers. The microcosm could be readily replicated. It was confirmed the population densities of each organism were almost constant for 365 days without ...

Evidence is accumulating that in the green algae the evolution of female and male gametes differing in size--anisogamy--involves genes linked to the mating-type locus, as was predicted theoretically.

The coexistence of competing species depends on the balance between their fitness differences, which determine their competitive inequalities, and their niche differences, which stabilise their competitive interactions. Darwin proposed that evolution causes species' niches to diverge, but the influence of evolution on relative fitness differences, and the importance of both niche and fitness di...