FEEDING ECOLOGY OF STREAM-DWELLING CHARACIDAE (OSTEICHTHYES: CHARACIFORMES) FROM THE UPPER TOCANTINS RIVER, BRAZIL

Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil

In this contribution we studied the trophic ecology of four Characidae species from the Cavalo Stream, upper Tocantins River, considering diet overlap and trophic niche breadth.The quarks dsp diet of the four species was composed of adult and immature insects, both autochthonous and allochthonous in origin.Autochthonous items dominated the diet of

read more



The effect of transport apertures on relay-imaged, sharp-edged laser profiles in photoinjectors and the impact on electron beam properties

In a photoinjector electron source, the initial transverse electron bunch properties are determined by the spatial properties of the laser beam on the photocathode.Spatial shaping of the laser is commonly achieved by relay imaging an illuminated circular mask onto the photocathode.However, the Gibbs phenomenon shows that recreating the sharp edge a

read more