Sentences with phrase «changes in population composition»

Although he carefully denied (as social scientists do) that he was making predictions, he wrote that «we may expect these gradual changes in population composition to encourage many, or most, of the following developments.»

«The change in the population composition in the U.S. can not explain the huge increase in intermarriage that we observe,» say Ortega and Hergovich.

Not exact matches

Watch the generations fly by in this animation showing the changing age composition of the U.S. population.

That's not to say that nothing has changed: there have been dramatic shifts since the pre-bubble years in the composition of local populations.

The fall in the number of births to immigrant women is explained by behavior (falling birth rates), rather than population composition (change in the number of women of childbearing age), according to a Pew Research analysis.

Moreover, for all the uncertainties of long - term population forecasting, the likely change in size and composition of a national population can be predicted over the course of the coming calendar year with far greater certainty than can changes in the harvest, the gross national product, the unemployment rate, the foreign exchange rate, or the demand for any particular product.

The lack of change in the composition of the electorate in recent years is not unexpected, given that there are limits on how great a share of the electorate a subgroup can represent — mainly its share of the overall U.S. adult population.

By cross-referencing these impacts with data on local elephant populations, forest tree - species composition and structure, nutrient availability, and understory growth in existing Central African forests — both protected and unprotected ones alike — Poulsen and his team determined that up to 96 percent of all forests in the region were susceptible to dramatic changes if elephant populations shrank or disappeared.

«Changes in the food composition and population of these critters signal changes in the status of the deep sea as a whole.Changes in the food composition and population of these critters signal changes in the status of the deep sea as a whole.changes in the status of the deep sea as a whole.»

It's currently a challenge to do this kind of microbial redesign — antibiotics reduce microbial burden but fail to induce major changes in bacterial composition, and from fecal transplant studies in the gut we know that bacterial populations return to a baseline population even after a major shift — so more work is needed to attempt a durable change in the vaginal microbiome.

The researchers believe the drugs change the composition of the bacterial population in the gut in a crucial developmental stage that may have a long - lasting impact.

Most indicators of the state of biodiversity (covering species» population trends, extinction risk, habitat extent and condition, and community composition) showed declines, with no significant recent reductions in rate, whereas indicators of pressures on biodiversity (including resource consumption, invasive alien species, nitrogen pollution, overexploitation, and climate change impacts) showed increases.

Changes in chemical composition and disruptions to dissolved oxygen levels in the water from pollutants and construction could harm numerous populations of freshwater and marine fish found nowhere else in the world.

In education, that phenomenon explains why some aggregate trend lines look flat or worse, even though every student subgroup is improving, because of the changing demographic composition of the total student population (e.g., lower - scoring Latino students are gradually replacing higher - scoring white students).

We also include student fixed effects, which account for changes in the composition of the schools» student populations over time that can not be explained by the limited set of student characteristics for which information was available in the district's database.

The reason has to do with dramatic changes in the racial / ethnic composition of the U.S. student population during the past few decades.

In addition to the rapid growth of the U.S. population, there have been dramatic changes in the population's composition in the last 50 years: Americans are growing older, more educated, and more diversIn addition to the rapid growth of the U.S. population, there have been dramatic changes in the population's composition in the last 50 years: Americans are growing older, more educated, and more diversin the population's composition in the last 50 years: Americans are growing older, more educated, and more diversin the last 50 years: Americans are growing older, more educated, and more diverse.

This manual elucidates the ways in which population dynamics (growth, composition and distribution) interact with climate change and impact the well - being of people and the planet.

As the multicultural population grows and matures, it's changing in almost every way — from educational levels and workforce composition to household characteristics and accumulation of wealth.

In this study, which examines the changing size, demographic composition and economic fortunes of the American middle class, «middle - income» Americans are defined as adults whose annual household income is two - thirds to double the national median, about $ 42,000 to $ 126,000 annually in 2014 dollars for a household of three.3 Under this definition, the middle class made up 50 % of the U.S. adult population in 2015, down from 61 % in 197In this study, which examines the changing size, demographic composition and economic fortunes of the American middle class, «middle - income» Americans are defined as adults whose annual household income is two - thirds to double the national median, about $ 42,000 to $ 126,000 annually in 2014 dollars for a household of three.3 Under this definition, the middle class made up 50 % of the U.S. adult population in 2015, down from 61 % in 197in 2014 dollars for a household of three.3 Under this definition, the middle class made up 50 % of the U.S. adult population in 2015, down from 61 % in 197in 2015, down from 61 % in 197in 1971.