Sentences with phrase «trees over the study»

The 1,680 PSPs contained 320,878 living trees over the study period.

Not exact matches

ian... not sure which part you wanted me to reply on, but I will take issue with yr point about homosexuality being a threat to human existence.I'm no expert on the subject, but I think we cd safely assume that the phenomena has been with us since our ancestors came out of the trees... we're now over six billion and growing at an alarming rate.Not sure where you might find the data on this supposed threat to going forth and multiplying.BTW, I have read that homosexual behaviour is observable in the animal kingdom, but I wd need to do some work to reference a credible study.

Over 450 pupils of the Dagbasu primary school at Wallembelle in the Sisala East District of the Upper West Region, are forced to study under trees because they have no classrooms.

Treating each tale as a species that mutates over time, they've borrowed techniques from phylogenetics (the study of evolutionary relationships between living organisms) to map stories onto the tree of Indo - European languages.

Warmer temperatures and increased fire frequency over the next century could eliminate the Joshua tree from 90 percent of its current range within Joshua Tree National Park, according to another USGS sttree from 90 percent of its current range within Joshua Tree National Park, according to another USGS stTree National Park, according to another USGS study.

In a study, researchers, who report their findings in the current issue of Forests, found that an Ailanthus tree that lives around 40 years can produce approximately 10 million seeds during its lifetime, while Ailanthus trees that live over a 100 years can produce about 52 million seeds.

In a typical urban area with a high level of background air pollution — for example, around 15 micrograms of fine particulate matter (PM2.5) per cubic metre, or a nitrogen dioxide concentration around 33 micrograms per cubic metre — an extra 300 trees per square kilometre was associated with around 50 fewer emergency asthma cases per 100,000 residents over the 15 year study period.

Stressed trees no longer store as much CO2 The U.K. - Brazil research team that produced the new study used satellite measurements of dry season rainfall to estimate the magnitude of the two droughts over a study area of 5.3 million square kilometers in the southwest Amazon.

«Many cities have outlined goals to reduce carbon - dioxide emissions, and obviously tree - planting is one way to achieve that goal,» said Chang Zhao, a graduate student in the Geographical and Sustainability Sciences department at the UI and corresponding author on the paper, published in the journal PLOS One, «but our study shows it plays a minor role and that we need to focus on reducing carbon emissions over removing them.»

One of the interesting things to study, we know Central Park is important for migratory birds and we know that they depend upon the food resources that are here, but no one has ever really done a systematic survey of what actually they are feeding on, like we have never done a canopy study of all the invertebrates up in the trees to see what's coming out when and what is the predominant part of the diet of different birds and sort of quantifying; but what they have done — people have done — with shore birds and sort of gauging, weighing them, you know, catching them, weighing them, seeing how much weight they gain over time while they are rather resting and feeding before they depart on their northern trip.

Although overall tree species richness did not change over the two decades of the study, the type of species that predominated at the edges changed radically: from specialized trees capable of persisting in the dark understory to so - called generalist species.

A year - long study into the behaviour of over 450 blue tits and great tits found that a suburban neighbourhood with trees, shrubs and hedges between properties attract far more birds to their feeders than a Victorian urban terrace or manicured, modern housing estate.

A study of chain letters shows how to infer the family tree of anything that evolves over time, from biological genomes to languages to plagiarized schoolwork

These studies had actually tracked in real time the changes in the kinds of trees present (species diversity), the density of trees, and how well the trees were growing (by measuring each tree's diameter and from that forest's growth over time).

The team collected information on drought - induced tree deaths from 33 individual studies performed around the globe, which included data on 475 species and over 760,000 individual trees.

The South Hills crossbill, potentially a newly discovered species of finch, has evolved over the past 6,000 years with a unique dependence on its food source, the Rocky Mountain lodgepole pine, in a coevolutionary arms race that also changed the tree, according to a genomic study led by Tom Parchman, a biologist at the University of Nevada, Reno.

For mountain pine beetles, the study found fire severity was high immediately after an outbreak, but over time as the number of trees killed by the beetle outbreak grew, fire severity leveled out.

A previous study had shown that when elephants and other large animals are excluded from a patch of African savannah, tree cover increases by 9 per cent over 36 years.

And due to the tropical climate, trees in Monteverde don't form the rings usually used to study temperature and moisture patterns over time.

Taking advantage of data compiled over more than forty years by University of Kentucky seed scientists Jerry and Carol Baskin, who were also co-authors on the study, researchers analyzed seed dormancy data for more than 14,000 species of trees, shrubs, vines and herbs from across the globe.

In a 2016 study published in EcologyUSGS ecologist Adrian Das, Stephenson and their colleague Kristin Davis of Colorado State University's Natural Resource Ecology Laboratory tracked the lives of more than 23,000 trees in plots throughout Sequoia National Park over a 13 - year period.

«Based on this recent study we will now go on to propose physiological mechanisms for the origins of the new metabolic signals, so that eventually we can decipher how increasing CO2 in combination with changing climate affect tree growth — over decades»

The researchers collected information on drought - induced tree deaths from 33 individual studies performed around the globe, which included data on 475 species and over 760,000 individual trees in a variety of forest types.

Studying the mutation of just one human family tree over ten generations (500 years) will require 8 terabytes of data.

According to a recent study looking into the tree health of the South American / African / Southeast Asia tropical zone, in some areas, the mortality rates for trees has almost doubled over the past 35 years.

As part of a Head in the Clouds program with AWS, Cycle Computing, and Intel, NASA is leveraging cloud computing to study the carbon stored in trees and bushes over the Sahara.

There are of course many contributing factors but Esselstyn's work at the Cleveland clinic published last year showed it is possible to stabilize the arterial tree and almost eliminate arterial events... 0.6 % over 3 1/2 years as opposed to standard medical care of 20 % per year (Courage study).

Over many years of personal anthropological studies (people watching from cafe windows or park benches), I have observed with complete fascination the human being's ability to learn: People using branches to lift kites from tree - tops, younger people using lighters as beer - bottle openers, people reading beneath trees soaking up words to ponder over, etc... People are very cOver many years of personal anthropological studies (people watching from cafe windows or park benches), I have observed with complete fascination the human being's ability to learn: People using branches to lift kites from tree - tops, younger people using lighters as beer - bottle openers, people reading beneath trees soaking up words to ponder over, etc... People are very cover, etc... People are very cool.

Though Popp often performs on urban streets or at building sites — where her interventions are unannounced and sometimes disrupted — at Lynden she has had the opportunity to study the grounds over the course of three residencies to choose a path through the trees.

The Yamal data is definitely better than most data sets, at least relative to RCS detrending concerns (as is that of Esper et al., 2012), and also better than the Polar Urals, but other critical concerns remain (as they do for virtually all tree ring studies attempting to estimate relative climatic state variables over centuries).

Low tundra shrubs, many of which are willow and alder species, have rapidly grown into small trees over the last 50 years, according to the study, led by scientists from the Biodiversity Institute at the University of Oxford and the Arctic Center of the University of Lapland.

Trees «shield vulnerable species from climate change» 1 November 2013Last updated at 23:05 ET By Mark Kinver Environment reporter, BBC News Allowing forest canopies to grow over could help some flora species cope with rising temperatures Forests with dense canopies create a microclimate that protects a variety of cold - adapted plant species from warming air temperatures, a study has shown.

Researchers studying tree - ring data from living trees and dead trunks preserved in lakes in Finnish Lapland found a much longer - term cooling trend over the past 2,000 years than previously understood.

``... the three researchers write that they «provide experimental support for suggestions and simulation studies predicting that reductions in CO2 alone could have led to loss of tree cover in grassy environments in the last glacial (Bond et al., 2003; Harrison and Prentice, 2003),» and they say that «the large increases in CO2 from industrial emissions over the last century would now favor trees at the expense of grasses,» which conclusion is supported by palaeo - records that indicate that «trees disappeared from current savanna sites in South Africa during the Last Glacial Maximum (Scott, 1999), re-appeared in the Holocene, and have rapidly increased over the last half century,»... Read More

Given these a posteriori pattern - and - process combinations, it has been possible to reconstruct the chronology of fire occurrences and correlative tree regeneration of all the study sites over the last 2000 years.

In this study, the forest systems investigated were relatively young, and the study was carried out over a short period of time relative to the lifespan of the trees it measured.

Despite a 35 per cent increase in atmospheric carbon dioxide over the last 150 years, the study suggests that trees in the tropics aren't growing any quicker.

The researchers studied over a thousand trees of different ages, covering 12 different species and three different parts of the tropics.

In this study, more than 1000 tree - ring, ice core, coral, sediment and other assorted proxy records spanning both hemispheres were used to construct regional temperature change over the past 1500 years.

The finding that competition overwhelmed the change in tree vital rates in our study can be explained by tree competition for limiting resources, particularly for light and crown space and also possibly for water and other nutrients through root competition as stands developed over time.

Because Arctic sea ice is influenced by both air and water temperatures, the study authors use a combination of Arctic ice core, tree - ring and lake sediments to reconstruct Arctic conditions over the last 2,000 years.

One can only claim that the LIA and MWP were not global events if one elevates multi proxy studies that include time series that in some cases contain single trees, in other cases had extrapolated data in them, which, once removed, revealed, TA DA the MWP over other well established techniques that have never been disproven.

His study, based on carbon - dated tree remains, which were recovered under receding alpine glaciers, gives a clear picture of smaller glacier extent than today in several periods over the past 10,000 years.

Many studies typically use ring width when they should be using basal area increment, which tends to be linear over the life of the adult tree (past the pole stage.»

One author, speculating about the coming of a new ice age, pointed to «evidence of (at least) five rapid hemispheric coolings of about 5 °C... each event spread over not more than about a century,» Flohn (1974), quote p. 385; one line of evidence was carbon - 14 studies of tree stumps in glacial deposits: Denton and Karlén (1973).

A new study, published earlier this year in Nature, shows that the Congolese rainforests store far more carbon than previously thought: over 60 billion tonnes, about half of which in the living biomass of the forest trees, and the other... Continue reading →

In that study the researchers also found that larger trees, those over 61 centimeters (24 inches) in diameter, burned less severely than areas with trees that were 28 to 60 centimeters in diameter.

I don't lose any sleep over problematic behaviour in individual tree - ring proxy studies.

A new study of tree rings provides the most detailed record yet of at least four epic droughts that have shaken Asia over the last thousand years, from one that may have helped bring down China's Ming Dynasty in 1644, to another that caused tens of millions of people to starve to death in the late 1870s.