A Supplemental Function of the Avian Egg Tooth

@inproceedings{Wiebe2010ASF,
  title={A Supplemental Function of the Avian Egg Tooth},
  author={Karen L. Wiebe},
  year={2010}
}
  • K. Wiebe
  • Published 16 March 2010
  • Environmental Science, Biology
Abstract. Hatchlings use egg teeth to help break through the shell during hatching, but these structures could have an additional function of increasing nestlings' visibility. I investigated the size, color, and persistence of egg teeth in woodpeckers, which nest in dark cavities. Many species of woodpecker have two egg teeth, one each on the tip of the maxilla and of the mandible, which, together with the pale flanges, frame the open mouth when nestlings gape. A spectrometer confirmed that… 

Parents take both size and conspicuousness into account when feeding nestlings in dark cavity nests

Do all geckos hatch in the same way? Histological and 3D studies of egg tooth morphogenesis in the geckos Eublepharis macularius Blyth 1854 and Lepidodactylus lugubris Duméril & Bibron 1836

TLDR
Egg tooth ontogeny in two gekkotan species, the leopard gecko Eublepharis macularius and the mourning gecko Lepidodactylus lugubris, was compared using microtomography, scanning electron microscopy, and light microscopy to reveal differences in egg tooth implantation between Gekkota and Unidentata.

Egg covering in cavity nesting birds may prevent nest usurpation by other species

TLDR
Testing the hypothesis that secondary hole-nesting birds cover their eggs when they leave the nest to prevent usurpation of the cavity by other birds found that prospecting flycatchers hesitated to enter dark cavities with dark floors relative to boxes with exposed, reflective eggs.

Nest decoration: birds exploit a fear of feathers to guard their nest from usurpation

TLDR
It is suggested that naive prospecting birds may perceive feathers in nests as the result of a predation event, and that owners decorate nests with bright feathers that can be seen from the opening to deter others from entering.

Description of embryonic stages in Melanosuchus niger(Spix, 1825) (Crocodylia: Alligatoridae)

TLDR
The aim of this work is to monitorthe development of this species of Alligatoridae and characterize its stages based on the main morphological transformations the embryo undergoes during the incubation process.

Desenvolvimento embrionário de Melanosuchus niger (Crocodylia, Alligatoridae) : descrição de estágios e ontogenia do esqueleto

In the present work, we characterize the embryonic stages of Melanosuchus niger, based on the main morphological transformations which occurre during development. We also describe the chondrogenesis

References

SHOWING 1-10 OF 27 REFERENCES

Mouth Color of Nestling Passerines and Its Use in Taxonomy

TLDR
The distribution of mouth colors in nestling passerines is reviewed, their function and the probable selective pressures affecting them are assessed, and their use in taxonomy is evaluated.

Mouth coloration of nestlings covaries with offspring quality and influences parental feeding behavior

TLDR
The hypothesis that mouth coloration acts as a signal of nestling condition in the barn swallow Hirundo rustica is supported and it is shown that UV flange coloration influences parental decisions regarding food allocation.

Nestling mouth colour: ecological correlates of a begging signal

TLDR
It is suggested that nestling mouth colour has not been selected to make chicks detectable, but that this is the function of the surrounding flange, and reasons why signals of need through mouth colour are not more widespread.

Conspicuous, ultraviolet-rich mouth colours in begging chicks

TLDR
This is the first study to use UV-VIS spectrometry to quantify the gape colour, background nest colour and nest light environment of eight European passerines, and the dual-peak nature of the spectra suggests that gapes are avian non-spectral colours analogous to human purple.

Nestling colouration is adjusted to parent visual performance in altricial birds

TLDR
Comparisons of nestling colouration and visual sensitivity across 22 altricial bird species provide a first test of the hypothesis that nestlings’ colours tuned the perception capacities of their parents.

Better red than dead: carotenoid-based mouth coloration reveals infection in barn swallow nestlings

TLDR
It is demonstrated that the gape colour of nestlings challenged with a novel antigen and provided with the principal circulating carotenoid (lutein) have more brightly coloured red gapes than their challenged but unsupplemented siblings and this suggests that parents may favour nestlings with superior health by preferentially feeding offspring with the brightest gapes.

Costs and benefits of nest reuse versus excavation in cavity-nesting birds

Cavity nesters may either reuse an old cavity or excavate a new one. Nest reuse among cavity nesting birds has been considered traditionally to be a characteristic of weak excavators that lack nest

Ultraviolet sexual dimorphism and assortative mating in blue tits

TLDR
It is concluded that blue tits are markedly sex dimorphic in their own visual world, and that UV/violet coloration probably plays a role in blue tit mate acquisition.