Threat Reduction as a Cause of Differences in Bower Architecture, Bower Decoration and Male Display in Two Closely-Related Bowerbirds Chlamydera nuchalis and C. maculata

@article{Borgia1995ThreatRA,
  title={Threat Reduction as a Cause of Differences in Bower Architecture, Bower Decoration and Male Display in Two Closely-Related Bowerbirds Chlamydera nuchalis and C. maculata},
  author={Gerald Borgia},
  journal={Emu},
  year={1995},
  volume={95},
  pages={1-12}
}
  • G. Borgia
  • Published 1 March 1995
  • Environmental Science
  • Emu
Major structural differences in the bowers of different bowerbird species have long been recognised, but the evolutionary significance of these differences has never been determined. I compared the bowers and displays of two congeneric species, the Spotted Bowerbird Chlamydera maculata and the Great Bowerbird C. nuchalis, and used the Satin Bowerbird Ptilonorhynchus violaceus as an outgroup to define ancestral characters. Spotted Bowerbird bowers and display courts differ from the more typical… 
The Relationship between Bower Orientation, Platform Choice and Mating Success in the Great Bowerbird Chlamydera nuchalis nuchalis
Abstract Bowers are display structures built by male bowerbirds (Ptilonorhynchidae) to court females. Avenue bowers consist of two parallel walls of upright sticks. Visiting females enter the avenue
Bower location and orientation in Satin Bowerbirds: optimising the conspicuousness of male display?
TLDR
Study of Satin Bowerbird bowers in the mountainous rainforest of the Atherton Tablelands, Australia, found no significant tendency for bower platforms to face north, and a significant positive association between bower orientation and the orientation of the slope of the hill on which the bower was constructed, such that bowers were oriented upslope, further enhancing frontal illumination.
Coevolution of elaborated male display traits in the spotted bowerbird: an experimental test of the threat reduction hypothesis
TLDR
The results support the threat reduction hypothesis, which suggests that accessory traits evolve because they mitigate the threat associated with intense, aggressive male displays that are most effective in causing females to become sexually receptive.
Home-range sizes and bower visitation patterns of immature male Satin Bowerbirds (Ptilonorhynchus violaceus)
TLDR
Data is presented on the home ranges and movement patterns of six immature males, acquired through radio-tracking at the Bunya Mountains in south-east Queensland, and how immature males acquire the ability to display and build and decorate bowers.
Bower Structure is a Good Predictor of Mating Success in the Great Bowerbird
TLDR
An analysis of the generalized linear mixed model and model selection revealed that avenue length and wall thickness correspond to the size of the bower, which suggests that a larger bower provides females with better protection from a vigorous male's display.
Labile evolution of display traits in bowerbirds indicates reduced eects of phylogenetic constraint RAB K USMIERSKI ", G ERALD B ORGIA #, A LBERT U Y#
TLDR
Testing Gilliard’s (1969) transferral hypothesis indicated some support for the idea that the focus of display has shifted from bird to bower in avenue-building species, but not in maypole-builders or in bowerbirds as a whole.
Why Do Bowerbirds Build Bowers
central element of his theory of sexual selection called female choice. The high? ly sculptured structure of a bower and a male's use of brightly colored decora? tions suggested to Darwin that female
Stealing rates in the Great Bowerbird (Ptilonorhynchus nuchalis): effects of the spatial arrangement of males and availability of decorations
TLDR
Differences in the spatial arrangement of males, particularly bower density, may explain variation in stealing rates both within and between populations, though alternative explanations, such as differences in resource availability, are also relevant.
Male Great Bowerbirds perform courtship display using a novel structure that rivals cannot destroy
TLDR
A novel solution to male interference with external display structures in Great Bowerbirds is documented, showing that some males, including young individuals, adapt to this interference by displaying around tree trunks instead of bowers.
Bower location by the Spotted Bowerbird (Chlamydera maculata)
TLDR
The results suggest that bower location is primarily determined by large-scale habitat preferences, and within suitable habitat, bowers location is influenced by male—male interactions.
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