Sentences with phrase «dramatic changes in their population»

May 2, 2011 The winners of mass extinction: with predators gone, prey thrives In modern ecology, the removal or addition of a predator to an ecosystem can produce dramatic changes in the population of prey species.

Overall, 30 % of the bacterial types showed dramatic changes in their population.

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 diverse.

That year many schools went through a dramatic change in population as schools returned to primarily serving neighborhood students.

Not exact matches

This lack of change in smoking cessation under such a dramatic tax increase accentuates the difficulty in improving quit rates at the population level.23 It does provide a reference point to evaluate the magnitude of change reported for the 2014 - 15 US Current Population Survey - Tobacco Use Supplement (CPS - TUS).

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.

What they're saying and what they argue is that the issue is that the demographics which are changing dramatically... You know the baby boomers aren't buying as much, the Millennial's don't have as much money, at least in the United States, but around the world even in China where we've had a dramatic reduction in the growth in population, we don't have the youth that's coming on in relationship with the accumulation of wealth that the previous generations have had.

Consider a partial list of developments since just World War II: a broad national decline in denominational loyalty, changes in ethnic identity as hyphenated Americans enter the third and subsequent generations after immigration, the great explosion in the number of competing secular colleges and universities, the professionalization of academic disciplines with concomitant professional formation of faculty members during graduate education, the dramatic rise in the percentage of the population who seek higher education, the sharp trend toward seeing education largely in vocational and economic terms, the rise in government regulation and financing, the great increase in the complexity and cost of higher education, the development of a more litigious society, the legal end of in loco parentis, an exponential and accelerating growth in human knowledge, and so on.

One is changed environmental conditions for a discrete subpopulation of the original population, such as when ice ages cause dramatic changes in sea levels, cutting species into subgroups.

If we really stop and look at the dramatic changes going on all over the world and in the US (demographics, ethnic population shifts, a new era in how people under 50 look at the world, etc.) it points to a need to focus more than ever on the centrality of Christ Jesus.

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.

Bristol is the only city in the UK where the fox population has been monitored long - term: here fox numbers slowly fluctuate, with occasional dramatic changes, such as when the skin disease sarcoptic mange arrived in spring 1994.

The Gulf of Maine coastline, historically home to one of the richest shellfish populations in the U.S., is undergoing a dramatic change, with once - flourishing wild blue mussels all but disappearing, according to a study led by University of California, Irvine ecologists.

Overall, about 30 % of the bacterial types found in the intestine showed dramatic population changes after a course of ciprofloxacin.

As has long been noted, our feathered friends often provide «canary in a coal mine» early warnings as to the impacts and perils of environmental changes — and the dramatic shifts in their populations and behaviors over recent decades is ominous indeed.

San Francisco — Secondary - school principals, challenged by dramatic changes in the character of their student populations, appear to be increasingly concerned about improving their schools and dealing more effectively with student «learning styles.»

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

Yet many suburban districts now rival urban districts in the challenges they face, having experienced dramatic population changes in just the past decade, with fast growing numbers of English Language Learners and students living in poverty attending Read more about Suburban Schools: The Unrecognized Frontier in Public Education -LSB-...]

District protects schools from rapid and dramatic changes in curriculum and student population

The district helps schools respond to rapid and dramatic changes in curriculum and student population.

[76] Reintroduction of sea otters to British Columbia has led to a dramatic improvement in the health of coastal ecosystems, [77] and similar changes have been observed as sea otter populations recovered in the Aleutian and Commander Islands and the Big Sur coast of California [65] However, some kelp forest ecosystems in California have also thrived without sea otters, with sea urchin populations apparently controlled by other factors.

Reintroduction of sea otters to British Columbia has led to a dramatic improvement in the health of coastal ecosystems, [143] and similar changes have been observed as sea otter populations recovered in the Aleutian and Commander Islands and the Big Sur coast of California [144] However, some kelp forest ecosystems in California have also thrived without sea otters, with sea urchin populations apparently controlled by other factors.

Ongoing assessments of penguins and other life along the peninsula have not turned up any clear link between population changes and tourism so far, and the main source of change appears — so far — to be the dramatic warming of the regional climate, Ron Naveen told me in a recent e-mail.

These are — and dramatic changes in the rate of growth of human population (the «generators» of the human emissions)-- an upper limit to the amount of carbon contained in all the fossil fuels remaining on our planet

While the dramatic loss of weight has not led to a decline in the population of polar bears, that could change as a warming Arctic continues to melt away sea ice.

In Zimbabwe, where 10 percent of the population are infected with HIV, the change has been even more dramatic: life expectancy fell from 62 to 43 years between 1985 and 2005.

Having downplayed some of the more troubling elements of the scientific consensus — and simply dismissed the possibility of more dramatic changes that are currently being debated — Lomborg then seizes on one item in the WMO statement in particular — «The recent increase in societal impact from tropical cyclones has been largely caused by rising concentrations of population and infrastructure in coastal regions» — and runs with it.