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Peter R. Grant Quotes

American - Scientist | -

Plumage features constitute a major component of courtship signals.

Signals Courtship Major Features

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.

Song Immigration New Flow Population

Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection.

Bird Inheritance Adult Origin Traits

We observe closely related species in sympatry and infer how they evolved from a common ancestor.

Observe Common Species How Related

Species can be recognized by their morphological characteristics and songs.

Songs Characteristics Recognized

Thus mating of females was strictly along the lines of paternal song.

Song Lines Along Paternal Mating

The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted.

Song Choice Independent Rare Role

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 Learning Song Early Determined

Genes that underlie the capacity to receive, use and transmit information are the evolving properties.

Information Evolving Genes Capacity

Exchange of breeding individuals between two populations tends to homogenize their gene pools.

Two Between Exchange Breeding Pools

Islands are known to differ in the food supply available to ground finches, mainly seeds.

Food Seeds Ground Available Supply

Evidence of epistasis from hybridization studies is more scarce.

More Evidence Studies Scarce

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