TAXA DE FILTRAÇÃO DE DUAS ESPÉCIES DE CLADOCERA: SIMOCEPHALUS SERRULATUS (KOCH, 1841) E CERIODAPHNIA SILVESTRII (DADAY, 1902) - (CRUSTACEA, CLADOCERA, DAPHNIDAE)

The use of PCR-RFLP to genetically distinguish the morphologically close species: Ceriodaphnia dubia Richard, 1894 and Ceriodaphnia silvestrii Daday, 1902 (Crustacea Cladocera).

The cladocerans are important components of planktonic and benthic freshwater and good indicators of the trophic state of water bodies. The morphological taxonomy of many species of Cladocera is considered complex with minor differences separating some species. Nowadays, molecular techniques provide a powerful tool to identify and classify different taxonomical levels, using mainly ribosomal RN...

Description de Hyalomma dromedarii (Koch 1844) Morphologie de la larve et de la nymphe

The influence of algal densities on the toxicity of chromium for Ceriodaphnia dubia Richard (Cladocera, Crustacea).

Food availability may affect metal toxicity for aquatic organisms. In the present study, the influence of high, medium and low densities of the algae Pseudokirchneriella subcapitata (10(6), 10(5) and 10(4) cells.mL(-1), respectively) on the chronic toxicity of chromium to the cladoceran Ceriodaphnia dubia was investigated. C. dubia was exposed to a range of chromium concentration from 2.71 to 3...

Biologie de Hyalomma dromedarii (Koch 1844)

Effects of a vertebrate predator (Poecillia reticulata) presence on Ceriodaphnia cornuta (Cladocera: Crustacea) in laboratory conditions

Aim: To detect the induction of morphological and populational alterations on Ceriodaphnia cornuta concerning cyclomorphosis and population dynamic parameters as densities, fecundity rates, juveniles percentage, males presence and ephippia presence in the presence of predators; Methods: Two experiments were performed: Experiments with fishes fed on Ceriodaphnia cornuta – Experiment 1 – and “Fis...