Melanin and the abrasion resistance of feathers

Article Abstract:

A research effort quantifies the differences in indentation hardness that causes the differential abrasion resistance of melanic and non-melanic feather keratin. A primary remige was taken from every one of 12 willow ptarmigans being sampled. Melanic keratin found in grouse primary feathers were found to be significantly harder than non-melanic keratin. Hard materials are found to sustain more shallow cracks due to abrasive wear, which implies that melanic keratin are less prone to cracking compared to non-melanic keratin.

Birds, Feathers, Willow ptarmigan, Animal anatomy, Melanin

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Nutrient-reserve dynamics of breeding male wood ducks

Article Abstract:

The wood ducks' nutrient reserve dynamics are analyzed to determine if the males of the Aix sponsa species use endogenous fat and protein for reproductive energy. The male ducks in Alabama and Georgia were also studied for variations in prebasic molt and testis mass as related to their breeding status. The mass of the male ducks' carcass peaked in February and decreased during their mates' laying and incubation periods. Results showed that the male wood ducks depend much on lipid reserves for reproduction.

Energy metabolism, Bioenergetics, Ducks, Poultry breeding, Wood duck, Wood ducks

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Filter feeding in flamingos (Phoenicopterus ruber)

Article Abstract:

A research study on avian biology extends P.M. Jenkin's 1957 research and proposed a filter feeding model for Caribbean and Greater Flamingos. The model, which is based on the oropharyngeal integument's description, uses SEM, radiography and an analysis of kinematics and performances. A lingual back-and-forth pump is proposed for lateral water inflow and outflow. A provisional morphospace of avian filter feeding mechanisms is presented.

Food and nutrition, Morphology (Biology), Evolution (Biology), Evolution, Morphology, Flamingos

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