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.

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

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.

Evidence of epistasis from hybridization studies is more scarce.

Plumage features constitute a major component of courtship signals.

The theory of founder effects does not explain how novel features like plumage traits arise.

The process of speciation is completed with the cessation of genetic exchange.

Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.

Males transmit signals in courtship through behavioral displays.

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

Species can be recognized by their morphological characteristics and songs.

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.

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

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

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.

Closely related species of birds are also chromosomally similar.

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

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

There has always been quite a strong black and white art tradition in Australia, with quite a large contingent of cartoonists, given the size of the population.

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.

While Kuwait is not a democracy, giving only half the population a voice in their government is not a policy this Congress should support and one that I am glad that Kuwait's leaders are changing.

We can survive as a population only if we conserve, develop sustainably, and protect the world's resources.

Schools that are to cater for the whole population must offer courses that are as rich and varied as are the needs and abilities of the children who enter them.

Today, unless women gain jobs and athletic scholarships commensurate with their percentage of the population, feminists scream discrimination.

And so, the youngsters you have today, even though there are far fewer of them - in World War II 16.5 million men and women in uniform, today roughly a million in uniform in spite of the fact that the country is almost twice as large a population as we had in World War II.

The time is coming when the pressure of population on the means of subsistence will be felt here as it is now felt in Europe and Asia. Then will the world enter upon a new stage of its history - the final competition of races, for which the Anglo-Saxon is being schooled.

Our fifty principal cities contain 39.3 per cent of our entire German population, and 45.8 per cent of the Irish. Our ten larger cities only nine per cent of the entire population, but 23 per cent of the foreign.

The point of our demographics is that we're not having as many children and the population is stagnant, if not declining. So without immigration, we're not going to have the population.

I'm not overly alarmist about it, but I do think there are some worrying signs, like the growing accumulation of wealth by a very small proportion of the population, plus elections in the US are much more dominated by money than anywhere else calling itself a democracy.

People in Medicaid ought to have access to the same insurance as the rest of the population. If they are segregated, it will be a poor plan for poor people.

Since 1957, black people have experienced double-digit unemployment - in good times and bad times. Look at the population of African Americans in prison. They represent more than half the population of prisoners in the country, 55 percent of those on death row.

Three-quarters of the world's population doesn't have enough to eat!

About 20 per cent of the population believe themselves to have a food allergy and only about five per cent actually do.

But as population became denser, the natural chemical and biological recycling processes became overloaded, calling for a redefinition of property rights.

Frankly, I had thought that at the time Roe was decided, there was concern about population growth and particularly growth in populations that we don't want to have too many of.

When the Australian Government looked at how to meet the challenges, and the opportunities, presented by our ageing population, it saw that an all-encompassing approach was a prerequisite.

My patient population has a low recidivism rate, but if they haven't made up their minds that it is permanent, then of course, they will fail.

Israel would not do that, both because we cannot afford to be accused by the world of aggression and because we cannot, for security and social reasons, absorb in our midst a substantial Arab population.

Those 3,000 jobs in Sioux Falls, based on our population back then in Sioux Falls, would have taken 300,000 jobs in New York City to equal it at Citibank.

No dictator, no invader, can hold an imprisoned population by force of arms forever.

In Washington State, the immigrant population has grown by 42 percent in the five years between 2000 and 2005 - which is an increase from 8 percent to 10.6 percent of the overall population - and the jobless rate in the state has hit a 6 year low.

It is true, there are many bad people; there are more of them than in the past, but that is because there are more people, meaning the population has tripled; there must be three times more bad people.

They divided the city into three electoral wards, and in one ward there was 70 percent of the people, the Catholic population, and they elected eight representatives to the city council.

In the final analysis, the whole cause of world revolution hinges on the revolutionary struggles of the Asian, African and Latin American people who make up the overwhelming majority of the world's population.

Unless we do things in this country to slow down our population, slow down our birth control, provide better water for people, provide power for people, we're gonna find out that the next wars are not going to be fought over diamonds, gold and political things.

All I claimed was that when a drastic change occurs, it occurs in a relatively small and isolated population.

Illinois has less than a 12 percent black population and I won with 55 percent of the vote.

A finite world can support only a finite population; therefore, population growth must eventually equal zero.

With a growing population, there is a growing need for more water delivery and storage.