Sentences with phrase «when vegetation»

Also, a recent article on climate - vegetation dynamics concludes that, due to poor scientific understanding of ecological thresholds and their relationship to climate change, we can not accurately predict how or when vegetation will change due to global warming, or even whether these changes will be reversible (Maslin, 2004).

However, models have a tendency to overestimate the mid-continental drying in Eurasia, which is further amplified when vegetation feedbacks are included (Wohlfahrt et al., 2004).

This means that by around 2017, CO2 concentrations will likely be above 400 ppm throughout the entire year, even in the peak of summer when vegetation is fully grown — levels that scientists haven't seen since the Pliocene era, three to five million years ago.

Summer is spectacular during rainy season when the vegetation is lush and green and there are lots of newborn animals attracting predators and the migrant birds have also returned.

In winter, when vegetation becomes scarce, rabbits often turn to bark, buds and twigs for sustenance.

Instruments on the platforms will monitor changes in the concentrations of gases such carbon dioxide, which is mainly produced when vegetation is burnt during the dry season.

«We think the world was quite impoverished as a result of the KT event, and when the vegetation came back, angiosperms dominated.

Wildfire seasons tend to fall in hotter and drier times of the year, when vegetation is vulnerable to burning.

Not exact matches

If that doesn't help: when did certain single cell organisms decide to be plants and others decide to be vegetation eating animals?

Cheerfully they had represented local gods of vegetation in the sacred marriage rites and cheerfully submitted themselves to the knife when their year was up.

Maybe when I'm not looking, Adelaide and Harper are our there, picking vegetation out of the fleece as they get a snuggle.

When Noah finished his transaction with the vegetation and Jo caught sight of him tucking in his shirt, she lowered her own shirt, lifted her hands, and yelled, «Taa daa!»

The problem is that when this equilibrium is broken, the impacts for the hydrological system and vegetation seem to be rather persistent, taking 3 to 4 years for the system to recover,» says Eduardo Maeda.

«Vegetation is drying out quicker and is less able to withstand the impact of fire when it passes through,» he said.

«It is of paramount importance to account for changes in Saharan vegetation and dust emissions when simulating past climate change.

«They should remove as little vegetation and soil when climbing and establishing climbs.

This was revealed when the researchers merged their forest coverage maps with other maps depicting different types of vegetation.

«If you want to understand emissions, you need to understand land use and land cover change, especially when you have forests cut down and replaced by herbaceous vegetation.»

Satellite images are less helpful when it comes to the Amazon rainforest, where a thick canopy of vegetation blocks the view of most signs of ancient settlement.

Using NASA rain and vegetation data, researchers can track when and where arid lands begin to green, and for the first time anticipate if zebras will make the trek or, if the animals find poor conditions en route, understand why they will turn back.

This species prefers to flower after fire, when there is less competition from other vegetation.

Last year was a record one for dust production in the United States, when sparse and badly timed desert rains produced the lowest vegetation cover on record and 5 to 20 times as much dust as usual from the Colorado Plateau into the mountains.

Other studies of sea turtles suggest that characteristics of the sand, the slope of the beach and proximity to vegetation contribute to the success or failure of nests, but «no study has tried to determine what factors cause female leatherback sea turtles to dig a nest in a particular spot, or what factors contribute to when they come up to nest,» the researchers wrote.

When researchers finally arrived, they found solitary animals, high up in the forest canopy, screened from the ground by dense vegetation, and seldom descending.

Interactions with others could increase the likelihood of getting sick from parasites and fleas and can lead to competition for food (they eat grass and vegetation) at times when it may not be plentiful, Blumstein noted.

Pixel by pixel analysis of vegetation changes from week to week to give an early warning for the outbreaks of drought, hazardous fire conditions, or even when malaria may break out in Sub-Saharan Africa.

By examining daily rainfall and weekly vegetation data from satellite images and entering the data into migration models, the researchers were amazed at how well they could predict when zebras started migrating and how fast they migrated.

So, when you add all those up the deforestation is a little bit more, but we also know that somewhere else in the vegetation, CO2 is being taken from the atmosphere and that uptake, that's still debated whether it's primarily in the tropics or primarily in the boreal forest of the Northern Hemisphere.

When flowing, these rivers likely provided fertile habitats for animals and vegetation, creating «green corridors» across the region.

«Soils fall apart when we remove vegetation,» Bierman says, «and then the land erodes quickly.»

When they do emerge, salamanders can be spotted not only on forest floors but also up in trees and on other vegetation, oftentimes climbing as high as 8 feet up.

Fox's research, funded by the National Science Foundation and NASA, was designed to test his theory that rubber trees, which are exotics from the South America, differ from native vegetation in that they suck up most of their water when the soil is the driest at the beginning of the monsoon season.

But when we fenced reindeer, voles and lemmings out, vegetation became denser and the light was limited.

The Architecture of a Trophic Cascade: Predator - Herbivore - Vegetation When HSS formulated their hypothesis, the scientific community commonly accepted that bottom - up processes, mostly related to competition between species, were the primary forces shaping populations.

He found them in all 19 samples, including snow taken from Montana in the dead of winter, when there is almost no deciduous vegetation, and even in samples from Antarctica.

When Johnson and her students started to poke around through the dense vegetation swathing Mole Hill, the very texture of the volcanic rock appeared unusual.

One such insect, the sap - sucking aphid (a common pest in gardens), has an effective escape plan, though: the bugs detect an approaching herbivore's breath and simply drop off the plant before it's eaten.Researchers at the University of Haifa at Oranim, Israel first noticed this phenomenon when they allowed a goat to feed on aphid - infested alfalfa plants — 65 percent of the plant pests simultaneously dropped to the ground just before the vegetation was devoured.The team suspected that several cues might have motivated the mass dropping, including the sudden shadow cast by the goat, plant - shaking triggered by the munching marauder and / or the herbivore's exhalations.

When the geese arrive in the Arctic to breed, they forage on the sparse tundra vegetation and their droppings fertilize an ecosystem that does not usually receive many nutrients.

«There is a strong connection between when humans arrived, when mammoths went extinct and when you see this big increase in vegetation,» says Doughty.

When members of the Argonne team arrived at Murdock in 2004 for an initial assessment, they found trace levels of «carbon tet» in the resident vegetation.

«These mothers select the densest vegetation, especially when they're close to humans,» Steyaert says.

The vegetation changes, when they do happen, could ripple through the ecosystem, said Pearson.

But during the dry season, when the fields are fallow, evapotranspiration from agricultural land was an average of 60 percent lower than from native vegetation.

They compared local temperatures when buildings were made of bare concrete with when the concrete was covered in vegetation.

We need to take into account how the landscapes we live in today are the result of millennia of people doing things like burning vegetation, herding animals and farming when we make decisions about how to preserve, restore, or remodel environments.

How does this value compare with what what we think S was in earlier periods in Earth's history (e.g. do we think it was closer to 1 when there was little ice and / or carbon locked up in vegetation)?

I was recently asked to explain why we can use the paleo - climate record this way when it is clear that the greenhouse gas changes (and ice sheets and vegetation) in the past were feedbacks to the orbital forcing rather than imposed forcings.

The sawtooth pattern in the graphic shows just that in careful CO2 measurements over the past half - century or so: it builds during winter when deciduous trees are leafless, then declines in summer when the trees and vegetation take in the CO2 before the process starts building again the next fall.

«These mothers select the densest vegetation, especially when they're close to humans,» Steyaert said.

Warmer, drier climate phases can particularly increase fire risk when they follow cooler, wetter conditions that increase fire fuel availability via increased vegetation growth and reduced fire activity (Heyerdahl et al. 2008).