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We tested the hypothesis that the growth rate of Anabaena circinalis , under diurnally stratified conditions, would increase as flotation velocity increased owing to higher light availability. An in situ experiment compared the growth of diurnally stratified populations of A. circinalis with...
Delayed fluorescence (DF) excitation spectroscopy is a fast in vivo method to determine phytoplankton composition in freshwaters using the signature of photosynthetically active pigments which is characteristic in each algal class. Four classes could be distinguished: green algae (including...
Nitrogen uptake by net- (15–200 μm), nano- (1–15 μm) and picoplankton (<1 μm) was measured over seasonal cycles at two stations with different patterns of biological and chemical cycles in the Morlaix Bay (western English Channel). Though assimilable dissolved N nutrient pool at both...
Optical Plankton Counters (OPCs) have been in operation for ∼12 years and while there have been considerable research studies by the user community, some operational issues have emerged over this time, such as its operational limitations in high densities, the lack of accompanying flow...
The response of green algae Scenedesmus quadricauda and Selenastrum capricornutum to different levels of UV-B radiation was studied. Daphnia magna , the next step in the food web, was fed with UV-B treated algae. UV-B radiation induced the synthesis of UV absorbing substances and photosynthetic...
Monophylies of Neocalanus cristatus , Neocalanus plumchrus and Neocalanus flemingeri were revealed by nucleotide sequences of mitochondrial 16S rRNA gene (410 bp) but not of nuclear 18S rDNA gene (1802 bp). Intraspecific variations in mitochondrial 16S rRNA of N. cristatus collected from...
The efficiency of a cantilevered bridle net was tested in comparison with a Wisconsin net and a pumping system to sample zooplankton organisms in three water layers (epi-, meta- and hypolimnion) of three Canadian Shield lakes. Variations among samplers were compared to variations due to...
The genus Hexapanopeus Rathbun, 1898 contains eight species, of which three are found in the Brazilian coast. The larval development of two of these species has already been studied in the laboratory. This article describes in detail the morphology of the complete larval stages of Hexapanopeus...
A 2 year study of the phytoplankton community was carried out in the Indian River Lagoon, USA. In terms of biovolume, the phytoplankton community was generally dominated by dinoflagellates, diatoms or cyanobacteria. Mean phytoplankton standing crops were highest in the most flow-restricted...
Temporal patterns of larval occurrence of brachyuran taxa were described from Saco mangrove creek, Mozambique, based on plankton samples. Brachyuran larvae were collected hourly in four 24 h cycles during neap and spring tidal periods at a fixed station, in November 1997 and February 1998....
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