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"The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow."
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"I had found again and again that the most aberrant population of a species - often having reached species rank, and occasionally classified even as a separate genus - occurred at a peripheral location, indeed usually at the most isolated peripheral location."
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Personal Development
"Three-quarters of the world's population doesn't have enough to eat!"
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Personal Development
"The divergence of songs in the new population away from those in the progenitor population would only be prevented if these processes were balanced by repeated immigration and subsequent breeding: song flow."
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Personal Development
"Licences to have babies incidentally is something that I got in trouble for some years ago for suggesting even in Canada that this might be necessary at some point, at least some restriction on the right to have a child."
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Personal Development
"I have just joined the Board of the Population Institute because I am convinced that early stabilization of the world's population is important for the attainment of this objective."
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Personal Development
"The optimum population is, then, less than the maximum."
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Personal Development
"Population, when unchecked, increases in a geometrical ratio."
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Personal Development
"Our population is headed for a stable plateau, which means an aging population."
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Personal Development
"We are 5 percent of the global population and consume a third of the total resources - on some level we should all feel guilty relative to the world."
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Personal Development
"There is a very large chunk of our population who firmly believe in extraterrestrials."
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"Islands are known to differ in the food supply available to ground finches, mainly seeds."
Food
"Thus mating of females was strictly along the lines of paternal song."
Music
"The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted."
Choice
"To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life."
Life
"Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals."
Behavior
"Genes that underlie the capacity to receive, use and transmit information are the evolving properties."
Information
"Plumage features constitute a major component of courtship signals."
Courtship
"Males transmit signals in courtship through behavioral displays."
Courtship
"Closely related species of birds are also chromosomally similar."
Birds
"The theory of founder effects does not explain how novel features like plumage traits arise."
Theory
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