Sentences with word «dieback»

Studies suggest a threshold for boreal forest dieback of ≈ 3 °C global warming (77, 86), but limitations in existing models and physiological understanding make this highly uncertain.

A dangerous mix of human - caused devastation and cyclic drought could start a vicious circle of forest dieback in the Amazon.

The committee's report has attracted headlines for its concerns about the harshness of the cuts faced by Defra, which has been under strain dealing with the consequences of ash dieback disease, horsemeat contamination and flooding.

«The fundamental way to minimize the risk of Amazon dieback is to control greenhouse gas emissions globally, particularly from fossil fuel combustion in the developed world and Asia,» said Yadvinder Malhi, the lead author from Oxford University.

«It's strongly suspected that ash dieback disease was imported by timber movements from East Asia.

Tens of millions of ash trees across Europe are dying from the Hymenoscyphus fraxinea fungus — the most visible signs that a tree is infected with ash dieback fungus are cankers on the bark and dying leaves.

Both conditions caused dieback, a situation in which the tree will go through its growth cycle to produce seed but with reduced activity — hence less sap.

In fact, marine heatwaves experienced in Australia have already caused massive dieback of these important marine primary producers, threatening the socioeconomic benefits provided by coastal ecosystems.

Ash dieback threatens 95 % of all European ash trees and has already killed or severely damaged a quarter in southern Sweden and destroyed more than 80 % of young ash trees in Norway.

The new results also contrast sharply with forecasts made by the models used by the IPCC: even under future scenarios in which greenhouse gases rise dramatically, those models project the southern Amazon dry season will be at most 10 days longer by the end of the century, and that the risk of climate change - induced rainforest dieback should therefore be relatively low.

In that same year yet another research team, led by Yadvinder Malhi of the University of Oxford, published a similar study in the journal PNAS, titled «Exploring the likelihood and mechanism of a climate - change - induced dieback of the Amazon rainforest».

Among the effects could be more frequent, extreme weather events and droughts, rapid sea level rise from icecap melting, breakdown of the marine food chain and worst of all, feedback effects like large releases of methane from thawing permafrost, or large scale dieback of forests.

These Siberian pines are very bulbous — you can see there's been dieback on certain parts of the trunk, and then you can see there's regrowth.

Logging that happens today and potential future rainfall reductions in the Amazon could push the region into a vicious dieback circle.

03/13/2017 - Logging that happens today and potential future rainfall reductions in the Amazon could push the region into a vicious dieback circle.

A young ash tree dying from ash dieback fungal disease.

Dr Elizabeth Orton, a post-doctoral scientist at the John Innes Centre and lead author on the paper, recommends the creation of nurseries containing trees with diverse resistance to the ash dieback pathogen.

** Presumably this is also true for progressive dieback?

But then, their computer predicted, warmer temperatures and water stress would cause a huge dieback of the Amazon forest, which would stop absorbing carbon and start emitting it as a result.

We focus on comparing impacts from two particular forests that historically demonstrate vulnerability to increased rates of tree loss from dieback and / or deforestation.

A tipping point could arise where a certain amount of dieback stops the effective recycling of precipitation to the rest of the rainforest, resulting in more rapid dieback.An Amazon Basin Tipping Point

The fungus which causes Chalara dieback of ash trees has the potential to defend itself against virus attacks, research by British scientists has shown.

Over the past year, specific production research projects have concentrated on improving yields with better salinity and water management, plant breeding, avocado tree monitoring, pesticide resistance and Fusarium dieback disease.

The goals of the project include reconstructing extreme climate changes from the recent past (1894 - 2014), using historically referenced data to assess near - future global climate model projections, and to ultimately use this analysis to investigate ecological problems in Chesapeake Bay, such as eelgrass diebacks.

Infected trees die slowly, resulting in a forest full of various levels of colorful dieback.

In a similar vein, researchers have discovered a type of cacao resistant to Southeast Asia's vascular - streak dieback disease and are currently analyzing the genetic underpinnings of that trait.

Finding signs of massive plant dieback during the Eocene is not going to be easy though.

Infected trees experience dieback of branches and may be killed in as few as three years.

Several important trends could prevent a near - term dieback.

«Nightmarish scenarios follow from these data,» he goes on, «multiyear drought punctuated by intense heat waves leading to rapid ecosystem diebacks that in turn trigger other nonlinear processes of erosion and fire.

«Exploring the Likelihood and Mechanism of a Climate - Change - Induced Dieback of the Amazon Rainforest.»

Examples include the disintegration of the West Antarctic ice sheet leading to more rapid sea - level rise, or large - scale Amazon dieback drastically affecting ecosystems, rivers, agriculture, energy production, and livelihoods.

The loss of another 2 %, according to a World Bank study last year, could start to trigger dieback in the forest's relatively dry southern and south - eastern parts.

It will also be offset by an increase in forest dieback elsewhere, caused by rising aridity, drought, pests and fires — all symptoms of global warming.

In the southern portion of today's deciduous - coniferous transition forests the simulated dieback was indistinct and recovery by deciduous tree species was rapid.

The simulated effects of changing monthly temperature and precipitation included a distinctive dieback of extant trees at most locations, with only partial recovery of biomass in areas of today's temperate deciduous forest.

Boreal conifers also underwent diebacks and were replaced by deciduous hardwoods more slowly in the north than in the south.

A regional climate model (85) predicts Amazon dieback due to widespread reductions in precipitation and lengthening of the dry season.

However if there were major changes in land use - perhaps driven by population diebacks, might not that produce some regional climate drivers (albedo of forest versus field, etc.)?

The droughts raise a disturbing question: Could the great dieback predicted for midcentury already be starting?

One of the scarier possibilities to emerge from this body of work is worth dwelling on a bit, simply because it would be so devastating if it came to pass: the so - called Amazon dieback scenario.