The most prevalent explanation is that sexually size dimorphic brains evolves through sexual selection
(Maklakov et al.
If sexual selection
is the predominant factor maintaining the hybrid zone, we predict that the shape of the clines between transects to be concordant, thereby overriding potential dispersal differences associated with varying environmental and ecological conditions or variation in population densities that would cause cline shape to vary among localities (e.
Another aspect intrinsically related to sexual selection
, important for reproduction in vertebrates, is sexual recognition during mating where several stimuli (such as vision) are related (Orr, 1986).
In the present work, we identify and review key directions of research that are critical for broadening our understanding of the evolution of parental care and sexual selection
Darwin (1874) made little provision for sexual selection
in externally fertilizing aquatic invertebrates, arguing that the general lack of sexual dimorphism in these systems and their often sessile or sedentary lifestyles made them unlikely targets for the selective forces of mate choice or mating competition (see also Arnold, 1994: Levitan, 2005).
In a sense, sexual selection
is the psychological extension of natural selection.
Like the thong, the burqa--and its less extreme counterparts the chador and hijab--should be seen through the lens of Darwinian sexual selection
But this book, and the argument that enfolds through Roughgarden's pen, has me scratching my head and wondering if Darwin may have been a little off track about sexual selection
For scientists who want to understand the role sexual selection
plays in evolution, this study "is a nice example to illustrate how complicated sexual selection
is," Elisabeth Bolund told Science News.
theory posits that some characteristics became more prevalent due to the advantages they conferred on an ancestral individual's mating success (Andersson, 1994; Darwin, 1871).
Geary (Curators' Profess and Thomas Jefferson Professor, Department of Psychological Sciences, University of Missouri) provides a comprehensive introduction to the biological basis for gender-based differences between males and females and the biological basis of natural selection and sexual selection
upon which this evolution is founded.
The exhibition ranged from the impact of the discovery of geological 'deep time', which haunts Dyce's celebrated Pegwell Bay, to Darwin's ideas about sexual selection
, which may help explain why the peacock became a familiar symbol of the aesthetic movement.