Wednesday, June 02, 2021

No longer 'the disappeared': Mourning the 215 children found in a mass grave at Kamloops Indian Residential School

Veldon Coburn, Assistant Professor, Institute of Indigenous Research and Studies, L’Université d’Ottawa/University of Ottawa 

Content warning: This piece contains distressing details about Indian Residential Schools

A macabre part of Canada’s hidden history made headlines last week after ground-penetrating radar located the remains of 215 First Nations children in a mass unmarked grave on the grounds of the former Kamloops Indian Residential School.

Like 150,000 Indigenous children that were taken from their families and nations and placed in residential schools, the 215 bodies of children, some as young as three, located in Tk’emlúps were part of a larger colonial program to liquidate Indigenous nations of their histories, culture and foreclose on any future. To do this, Canada put into motion a system to “kill the Indian in the child.”

This system often killed the child.

While we currently have no evidence to determine the cause of death for each child, we know that they died a political death — these children were the disappeared.
Colonial population management projects

The chilling discovery in Tk’emlúps reminds us of the larger project of aggressive assimilation.

Indian Residential Schools were centres for state-directed violence against Indigenous nations, where the children — the heirs of Indigenous nations — were programmatically stripped of their Indianness.

Indigenous lives were broken down, sterilized of any trace of the gifts inherited from their parents and ancestors and re-packaged into Canadian bodies.

The brute nation-making scheme of the Canadian state looked to the existing infrastructure laid down by the prominent Christian churches. The churches were involved in population management almost from the moment of contact between European Crowns and Indigenous nations. The Catholic Church, which would go on to operate about 60 per cent of these schools, was a hawkish occupier.

Like branch plants in a vast production scheme, the state made good use of the extensive church network to co-ordinate the extraction of raw material—Indigenous children.

But the revelation of a mass disposal site for children — unrecorded and hidden — on the grounds of the Kamloops Indian Residential School tells us that the regulation of Indigenous life extended into death

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© Archdiocese of Vancouver Archives A 1937 photograph of the Kamloops Indian Residential School.

The politics of death and mourning


A fact many Indigenous people understand is that life’s benefits and burdens are shot through the colonial prism. As we go through life, we quickly learn that the weight of history’s finger is pressing firmly on the scale.

What is often overlooked is how that uneven distribution in life carries on through death.

Just as in life, how Indigenous death is mourned and remembered has been a matter of political control. The Canadian state, in partnership with the churches, has long unilaterally assumed sovereignty over Indigenous mortality and bereavement.

Nowhere is this more apparent than the atrocity at Tk’emlúps which has sharpened this for many Indigenous nations, as we see how the Catholic church not only denied these children the capacity to shape the means of and choose the ends of their life, but also they denied their communities control over their death.

In Tk’emlúps, the Catholic church decided that neither their lives nor their deaths were worthy of being known, remembered and commemorated.

One of the more appalling acts by the Catholic church in Tk’emlúps was how the children were deliberately forgotten; they were omitted from the official records that would verify their passing.

Documentation of death may seem clinical and lacking the human touch, but for some it has become crucial to contemporary remembrance. It is one way, of many culturally divergent methods, of confirming death and allowing the dead to have a social afterlife with the living. The painful void that lingers is what researcher Pauline Boss called ambiguous loss, “a loss that remains unclear because there is no death certificate or official verification of loss; there is no resolution, no closure.”

The memory of the person and their remains may strike us as two separate matters, but they are intimately connected in many cultures.

Not unlike Catholicism, the material body figures centrally amongst many Indigenous rites and ceremonies that cultivate social continuity with the dead. Matthew Engelke, who studies the anthropology of death, tells us that:

“(W)hat commemoration often involves is much more than remembering the dead. It requires a serious engagement with the things that ghosts and ancestors want: a proper burial, a pot of beer, a feast, money, a fitting grave-stone, the blood of a reindeer, the blood of kin.”

The truth about the disappeared


The truth about the atrocity at Tk’emlúps escaped examination during the Truth and Reconciliation Commission (TRC). In the weeks before the TRC launched in 2008, the Catholic church was confronted with the allegations of a mass grave. Back then, the church denied any knowledge.

Until their remains were recently located, the Catholic church was content to leave 215 children as ‘disappeared.’

The disappeared — those that have been secretly disposed — produce a unique grieving. They leave families and communities in a state of suspended mourning, never sure whether their loved one is alive or dead, or where their remains have been left.

It is life abandoned to death with no chance of the living to intervene.

Now that they have been located, the surviving families, communities and Nations can begin to think about custodianship of the remains, mourning and memorialization. That much is up to them and every support and resource ought to be provided.

If you are an Indian Residential School survivor, or have been affected by the residential school system and need help, you can contact the 24-hour Indian Residential Schools Crisis Line: 1-866-925-4419

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Veldon Coburn receives funding from the Canadian Institutes of Health Research and the Social Sciences and Humanities Research Council.

 


 ET Canada

Buffy Sainte-Marie On Being An Advocate For Indigenous Community




June 1 marks the beginning of National Indigenous History Month. Award-winning singer-songwriter and Canadian trailblazer, Buffy Sainte-Marie, discusses being a prominent advocate in the Indigenous community and shares a piece of advice for young women wanting to follow in her footsteps.

 Calls for Canada to recognize and document its racist foundations


Duration: 02:24 

As Canada grapples with the horrific discovery of 215 children at suspected burial sites of a former B.C. residential school, there are calls for the country to do more to address the racist policies and actions of the country’s past. As Eric Sorensen reports, Indigenous leaders say the country needs to stop celebrating historic figures responsible for the residential school system.



 

Turbulence in interstellar gas clouds reveals multi-fractal structures

UNIVERSITY OF COLOGNE

Research News

In interstellar dust clouds, turbulence must first dissipate before a star can form through gravity. A German-French research team has now discovered that the kinetic energy of the turbulence comes to rest in a space that is very small on cosmic scales, ranging from one to several light-years in extent. The group also arrived at new results in the mathematical method: Previously, the turbulent structure of the interstellar medium was described as self-similar - or fractal. The researchers found that it is not enough to describe the structure mathematically as a single fractal, a self-similar structure as known from the Mandelbrot set. Instead, they added several different fractals, so-called multifractals. The new methods can thus be used to resolve and represent structural changes in astronomical images in detail. Applications in other scientific fields such as atmospheric research is also possible.

The German-French programme GENESIS (Generation of Structures in the Interstellar Medium) is a cooperation between the University of Cologne's Institute for Astrophysics, LAB at the University of Bordeaux and Geostat/INRIA Institute Bordeaux. In a highlight publication of the journal Astronomy & Astrophysics, the research team presents the new mathematical methods to characterize turbulence using the example of the Musca molecular cloud in the constellation of Musca.

Stars form in huge interstellar clouds composed mainly of molecular hydrogen - the energy reservoir of all stars. This material has a low density, only a few thousand to several tens of thousands of particles per cubic centimetre, but a very complex structure with condensations in the form of 'clumps' and 'filaments', and eventually 'cores' from which stars form by gravitational collapse of the matter.

The spatial structure of the gas in and around clouds is determined by many physical processes, one of the most important of which is interstellar turbulence. This arises when energy is transferred from large scales, such as galactic density waves or supernova explosions, to smaller scales. Turbulence is known from flows in which a liquid or gas is 'stirred', but can also form vortices and exhibit brief periods of chaotic behaviour, called intermittency. However, for a star to form, the gas must come to rest, i.e., the kinetic energy must dissipate. After that, gravity can exert enough force to pull the hydrogen clouds together and form a star. Thus, it is important to understand and mathematically describe the energy cascade and the associated structural change.

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More information about GENESIS: astro.uni-koeln.de/stutzki/research/genesis

 

Researchers explore ways to detect 'deep fakes' in geography

BINGHAMTON UNIVERSITY

Research News

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IMAGE: RESEARCHERS COMBINED SATELLITE IMAGES OF TACOMA, WASHINGTON, WITH SEATTLE AND BEIJING TO CREATE A COMPOSITE IMAGE, AND THEN IDENTIFIED DIFFERENCES BETWEEN THE FALSE AND TRUE IMAGES. view more 

CREDIT: CHENGBIN DENG

Can you trust the map on your smartphone, or the satellite image on your computer screen?

So far, yes, but it may only be a matter of time until the growing problem of "deep fakes" converges with geographical information science (GIS). Researchers such as Associate Professor of Geography Chengbin Deng are doing what they can to get ahead of the problem.

Deng and four colleagues -- Bo Zhao and Yifan Sun at the University of Washington, and Shaozeng Zhang and Chunxue Xu at Oregon State University -- co-authored a recent article in Cartography and Geographic Information Science that explores the problem. In "Deep fake geography? When geospatial data encounter Artificial Intelligence," they explore how false satellite images could potentially be constructed and detected. News of the research has been picked up by countries around the world, including China, Japan, Germany and France.

"Honestly, we probably are the first to recognize this potential issue," Deng said.

Geographic information science (GIS) underlays a whole host of applications, from national defense to autonomous cars, a technology that's currently under development. Artificial intelligence has made a positive impact on the discipline through the development of Geospatial Artificial Intelligence (GeoAI), which uses machine learning -- or artificial intelligence (AI) -- to extract and analyze geospatial data. But these same methods could potentially be used to fabricate GPS signals, fake locational information on social media posts, fabricate photographs of geographic environments and more.

In short, the same technology that can change the face of an individual in a photo or video can also be used to make fake images of all types, including maps and satellite images.

"We need to keep all of this in accordance with ethics. But at the same time, we researchers also need to pay attention and find a way to differentiate or identify those fake images," Deng said. "With a lot of data sets, these images can look real to the human eye."

To figure out how to detect an artificially constructed image, first you need to construct one. To do so, they used a technique common in the creation of deep fakes: Cycle-Consistent Adversarial Networks (CycleGAN), an unsupervised deep learning algorithm that can simulate synthetic media.

Generative Adversarial Networks (GAN) are a type of artificial intelligence, but they require training samples -- input -- of whatever content they are programmed to produce. A black box on a map could, for example, represent any number of different factories or businesses; the various points of information inputted into the network helps determine the possibilities it can generate.

The researchers altered a satellite image of Tacoma, Washington, interspersing elements of Seattle and Beijing and making it look as real as possible. Researchers are not encouraging anyone to try such a thing themselves -- quite the opposite, in fact.

"It's not about the technique; it's about how human being are using the technology," Deng said. "We want to use technology for the good, not for bad purposes."

After creating the altered composite, they compared 26 different image metrics to determine whether there were statistical differences between the true and false images. Statistical differences were registered on 20 of the 26 indicators, or 80%.

Some of the differences, for example, included the color of roofs; while roof colors in each of the real images were uniform, they were mottled in the composite. The fake satellite image was also dimmer and less colorful, but had sharper edges. Those differences, however, depended on the inputs they used to create the fake, Deng cautioned.

This research is just the beginning. In the future, geographers may track different types of neural networks to see how they generate false images and figure out ways to detect them. Ultimately, researchers will need to discover systematic ways to root out deep fakes and verify trustworthy information before they end up in the public view.

"We all want the truth," Deng said.

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ALS development could be triggered by loss of network connections in the spinal cord

UNIVERSITY OF COPENHAGEN - THE FACULTY OF HEALTH AND MEDICAL SCIENCES

Research News

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IMAGE: THE SPINAL CORD OF A MOUSE WITH ALS. THE GREEN CELLS ARE INHIBITORY INTERNEURONS. view more 

CREDIT: ILARY ALLODI, UNIVERSITY OF COPENHAGEN

ALS is a very severe neurodegenerative disease in which nerve cells in the spinal cord controlling muscles and movement slowly die. There is no effective treatment and the average life expectancy after being diagnosed with ALS is usually short. Because of this, new knowledge about the disease is urgently needed.

Now, researchers from the University of Copenhagen have gained new insights about ALS, by investigating the early development of the disease in a mouse model.

"We have found that networks of nerve cells in the spinal cord called inhibitory interneurons lose connection to motor neurons, the nerve cells that directly control muscle contraction. We do not yet know if these changes cause the disease. But the loss of the inhibitory signal could explain why the motor neurons end up dying in ALS", says first and co-corresponding author to the new study Ilary Allodi, Assistant Professor at the Department of Neuroscience.

A lot of ALS research have focused on the motor neurons themselves, but the research group at the University of Copenhagen had a different approach.

"It is only natural that motor neurons have received major attention. They control our muscles, which is the challenge for ALS patients. Here, we wanted to investigate the circuit of interneurons in the spinal cord because they determine the activity of motor neurons. Since we found that there is a loss of connections between inhibitory interneurons and motor neurons that happens before the motor neuron death, we think that this loss could be a possible explanation for why the motor neurons ends up dying in ALS patients", says Ole Kiehn, senior, co-corresponding author and Professor at the Department of Neuroscience.

Fast-twitch first

In ALS patients, the degeneration typically starts with what is called the fast-twitch motor neurons and then goes on to other motor neurons. This means that certain muscles and bodily functions are affected before others. Normally, patients lose coordination and speed in movement before more basic functions such as breathing. This is mirrored in the new findings, according to the researchers.

"In our mouse model, we show that the loss of connection happens to fast motor neurons first and then slow motor neurons later on involve a particular type of inhibitory neurons, the so called V1 interneurons", says Roser Montañana-Rosell, who is PhD student and shared first author on the study.

"The V1 interneuron connectivity loss is paralleled by the development of a specific locomotor deficit in the pre-symptomatic phase with lower speed and changes in limb coordination in the ALS mice that is dependent on V1 interneuron connections to motor neuron", says Ole Kiehn.

Expanding the window of opportunity

The researchers underline that the mechanisms should be investigated in human patients as well. However, they do not have any reason to believe that the same or similar biological mechanisms are not at play in humans.

Given the new understanding of the disease, Ilary Allodi hopes further research into the signaling process could reveal how to repair the nerve cell connection loss in ALS.

"We definitely hope that our findings can contribute with a new way of thinking about ALS development. With a distinct focus on interneurons, we might be able, in future experiments, to increase the signaling processes from the interneurons to the motor neurons and prevent or delay the motor neuron degeneration from an early stage," ends Ilary Allodi.

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Read the entire study in Nature Communications: "Locomotor deficits in a mouse model of ALS are paralleled by loss of V1-interneuron connections onto fast motor neurons"

 

Protecting the intellectual abilities of people at risk for psychosis

A UNIGE team has found that a class of drugs can protect the development of intellectual abilities in people at risk of psychosis, if prescribed before adolescence

UNIVERSITÉ DE GENÈVE

Research News

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IMAGE: EFFECTS OF SSRIS ON BRAIN AND INTELLECTUAL DEVELOPMENT. ON THE LEFT SIDE: BRAIN MAP SHOWING REGIONS OF THE BRAIN PROTECTED BY THE PROLONGED ADMINISTRATION OF SSRIS COMPRISING A NETWORK OF... view more 

CREDIT: VALENTINA MANCINI

One person in 2000 suffers from a microdeletion of chromosome 22 that can lead to the development of psychotic disorders, such as schizophrenia, in adolescence. In addition to symptoms such as hallucinations or delusions, psychotic disorders also comes with a progressive decline in intelligence quotient (IQ). If current drug treatments are successful in containing psychotic symptoms, nothing can be done to prevent the deterioration of intellectual skills that leads to loss of autonomy. Researchers at the University of Geneva (UNIGE), Switzerland, have discovered that prescription of selective serotonin reuptake inhibitors (SSRIs) - a class of drugs used to treat anxiety and depression -in late childhood can reduce the deterioration of intellectual abilities, and have a neuroprotective effect on some of the brain regions affected by the psychotic illness. This study, to be read in the journal Translational Psychiatry, opens up a new field of research and new hope for people affected by the microdeletion of chromosome 22.

The average IQ is around 100 points. However, for people who may develop a psychotic illness, such as those with a microdeletion of chromosome 22, the average drops to 70-80 points. "The problem is that when a psychotic disorder occurs, such as schizophrenia, the brain frontal lobe and the hippocampus are particularly affected, which leads to the gradual deterioration of already below-average intellectual capacities", explains Valentina Mancini, a researcher in the Department of Psychiatry at UNIGE Faculty of Medicine and first author of the study. From then on, the average IQ drops to around 65-70 points, leading to a loss of autonomy that requires a protected environment. "At present, drug treatments manage to contain psychotic symptoms, such as hallucinations, anxiety or distortion of reality, but there is no treatment that can reduce the deterioration of affected people's intellectual capacities", notes the Geneva researcher.

200 patients followed over a 20 years period reveal a possible solution

The team of Stéphan Eliez, professor in the Department of Psychiatry at UNIGE Faculty of Medicine, has been following 200 patients affected by the microdeletion of chromosome 22 for the past 20 years. "30 to 40% of them developed schizophrenia psychotic disorder", he explains. "Thanks to this cohort, we found that people suffering from this syndrome lost 7 to 8 IQ points from childhood to adulthood. This figure rises to 15 IQ points for those who developed psychotic disorders."

Yet the physicians noted that two to three teenagers a year are exceptions, and even gained IQ points. Why? "We made a comprehensive analysis of these patients' medical data to find out any common feature in the treatments prescribed to them by their GP", explains Valentina Mancini. Two observations caught their attention.

The first is the prescription of small, regular doses of SSRIs - a drug that increases the levels of serotonin, a neurotransmitter involved in the regulation of behaviour - in late childhood and throughout adolescence. "These drugs increase neurogenesis and act on synaptic plasticity. They are prescribed today to reduce anxiety and depressive symptoms", explains the Geneva researcher. And the younger the patients received this treatment, at around 10-12 years of age, the more the frontal lobe and the hippocampus - and therefore the intellectual capacities - were preserved from deterioration caused by the psychotic illness. The second observation is that a neuroleptic drug - prescribed in small doses to control psychotic symptoms such as hallucinations or delusions - also seems to have a positive effect if added to SSRIs during adolescence. "These two medications, especially when combined, have thus preserved the anatomical structure of the brain affected by the degradation responsible for the decline in intellectual capacity", remarks Stéphan Eliez.

A promising discovery for the future of people at risk of psychosis

This study provides for the first time an indication of a neuroprotective preventive treatment for the development and preservation of IQ. "It should be stressed that too great a deterioration of intellectual skills progressively leads to a very problematic psychosocial dependence. Here, we could succeed in protecting this population", notes Stéphan Eliez.

Once the results of this study are confirmed, the effect of SSRIs could be tested on other types of patients and possibly prescribed preventively to people at risk of intellectual deterioration, such as individuals with other genetic syndromes like Fragile X or Down's syndrome, or children of schizophrenic parents. "We also want to investigate whether the 3% to 4% of adolescents in the general population who develop psychotic symptoms would see this risk reduced by taking this drug", continues Valentina Mancini.

The Geneva team will now compare the results obtained from their research cohort with international databases in order to confirm the neuroprotective role induced by these treatments prescribed at the end of childhood, adolescence being the critical phase for the onset of psychotic diseases.


 

Curtin study finds WA's natural 'museums of biodiversity' at risk

CURTIN UNIVERSITY

Research News

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IMAGE: A BIODIVERSE BIF IN THE MID WEST view more 

CREDIT: CURTIN UNIVERSITY

Up to three quarters of the biodiversity living on Western Australia's iconic ironstone mountains in the State's Mid West (known as Banded Iron Formations) could be difficult or impossible to return quickly to its previous state after the landscape has been mined, a Curtin University study has found.

The research published in Ecology and Evolution, discovered that the plant ecosystems are well-adapted to the characteristics of the region's ancient and nutrient-poor soils - and that the very different features of mined landscapes mean many native species are unlikely to be returned by rehabilitation.

Lead researcher Dr Adam Cross from Curtin's School of Molecular and Life Sciences said the elevation and different habitats offered by Banded Iron Formations (BIF) in an otherwise dry, mostly flat landscape, make them a sponge for biodiversity - but that their iron-rich rock made them increasingly attractive to iron-ore miners.

"Unfortunately, the chemical characteristics of some tailings and other by-products produced by mines can be more similar to material on the moon than to the ancient, highly-weathered soils of BIF, and this presents a really challenging, hostile environment for many native plant species," Dr Cross said.

The Mid West region is known for its BIF ranges, which Dr Cross describes as stunning natural 'museums', that host much of the regional florist biodiversity. He said almost every plant species from the surrounding landscape can be found on them - as well as some unique species found nowhere else.

"These collections of species have accumulated over very long periods of time, and the increased pressure to mine BIF is putting the biodiversity at risk. Once BIF are gone, that's it - we cannot recreate these iconic landforms, and our study suggests that, even if we could, the post-mining environment likely wouldn't support many of the species that used to call them home."

"BIF harbour such biodiversity because in periods where the climate has been hotter and drier, their rocky, complex soils offered a cooler, wetter refuge for many species that were unable to survive in the surrounding landscape.

"With climate change suggesting a hotter, drier outlook for the Mid West region in future decades, it is increasingly important that we preserve and conserve remaining BIF habitats and the species growing on them."

The research team looked at 538 plant species in an 82,000 hectare area in WA's Mid West, assessing their growth on different soil types across the region and examining their potential tolerance to the chemical characteristics of mined materials.

Although many species were adapted to the acidic, nutrient-poor soils of BIF, the team found at least some were tolerant of a wide range of soil types and might be used as 'pioneers' to help kick-start vegetation recovery in rehabilitation.

Dr Cross said more studies were needed to find ways to rapidly change the chemical characteristics of post-mining soils to speed up rehabilitation, and preserve the area's biodiversity.

"The mining industry needs to consider the soil properties of landforms requiring rehabilitation or ecological restoration, and the implications for vegetation establishment and plant community development, at the very earliest stages of planning or environmental impact assessment," Dr Cross said.

"Ecosystems are extremely complex; we need to recognise, appreciate and learn from this complexity when we are attempting to return biodiversity to areas that have been impacted by mining.

"We need to reach a happy medium between development and conservation to effectively continue mining in these areas, while preserving our incredible natural resources."

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The research was funded by The Centre for Mine Site Restoration at Curtin University.

The full paper Calcicole-calcifuge plant strategies limit restoration potential in a regional semi-arid Flora can be found online here: https://onlinelibrary.wiley.com/doi/10.1002/ece3.7544.

 

Newly identified atmospheric circulation enhances heatwaves and wildfires around the Arctic

HOKKAIDO UNIVERSITY

Research News

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IMAGE: THE RELATIONSHIPS AMONG CAW, HEATWAVES, WILDFIRES, AND POLLUTION. ANOMALOUS ANTICYCLONES CHARACTERIZE THE ATMOSPHERIC CIRCULATION THAT DEVELOPS CONCOMITANTLY OVER THE THREE REMOTE REGIONS AROUND THE SUMMERTIME ARCTIC (JULY AND AUGUST). THE... view more 

CREDIT: TEPPEI J. YASUNARI, ET AL. ENVIRONMENTAL RESEARCH LETTERS. MAY 17, 2021.

Scientists have uncovered a summertime climate pattern in and around the Arctic that could drive co-occurrences of European heatwaves and large-scale wildfires with air pollution over Siberia and subpolar North America.

In recent years in summer, there have often been extremely high temperatures over Europe, including heatwaves and active wildfires in and around the Arctic such as Siberia and subpolar North America (Alaska and Canada), which have caused widespread air pollution. For instance, in July 2019, significant Alaskan wildfires were detected by satellites. The recent unusual climate phenomena are of immense concern to many people living in these regions.

A team of scientists from Japan, South Korea, and the USA, including Hokkaido University's Assistant Professor Teppei J. Yasunari, have revealed relationships among wildfires, aerosols (air pollution), and climate patterns in and around the Arctic. They have published their discoveries in the journal Environmental Research Letters. Involved in this study were Professor Hisashi Nakamura, The University of Tokyo, Japan; Dr. Nakbin Choi and Professor Myong-In Lee, Ulsan National Institute of Science and Technology, Republic of Korea; and Professor Yoshihiro Tachibana, Mie University, Japan, and two scientists from the Goddard Space Flight Center, National Aeronautics and Space Administration (NASA), USA.

"Wildfires lead to extensive air pollution, primarily in the form of inhalable particulate matter with diameters of 2.5 micrometers or smaller (PM2.5). Arctic hazes during winter and spring are typical phenomena due to aerosols existing in the Arctic. In our scientific field, it is also known that deposition of light-absorbing aerosols onto snow surfaces can induce the so-called snow darkening effect, contributing to accelerated snow melting. For these reasons, long-term assessments of PM2.5 and aerosols in the Arctic and surrounding regions are required," said Yasunari.

For their investigations, the scientists used the MERRA-2 (Modern-Era Retrospective analysis for Research and Applications, version 2) dataset and fire data by satellite, both produced by NASA, focusing on the recent period from 2003 to 2017. They assessed comprehensive air pollution (i.e., PM2.5) in the Arctic for as long as the past 15 years, seeking to clarify the relationships between variations in PM2.5 and aerosols, wildfires, and the relevant climate patterns.

"We found 13 out of the 20 months with highest PM2.5 in the Arctic during the 15 year period were in summer. The elevated PM2.5 levels were highly correlated with relatively higher organic carbon aerosol concentrations, implying active wildfires. We concluded that the summertime wildfires contributed to those months with exceptionally high PM2.5 in the Arctic. In those months, the wildfires likely occurred under extremely warm and dry conditions. Those were due to concomitantly persistent or developed high-pressure systems over Europe, Siberia, and subpolar North America, namely, Alaska and Canada," explained Yasunari.

The scientists named this climate (atmospheric circulation) pattern, the circum-Arctic wave (CAW) pattern, as a driver for enhancing the co-occurrence of heatwaves in Europe and wildfires in Siberia and subpolar North America. In fact, the CAW-like pattern was also seen in the early summer of 2019, which was outside the period of the MERRA-2 analyses.

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Joint release by Hokkaido University, Research Center for Advanced Science and Technology, the University of Tokyo, Ulsan National Institute of Science and Technology, and Mie University.

 

Safe distance: How to make sure our outdoor activities don't harm wildlife

PENSOFT PUBLISHERS

Research News

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IMAGE: AN INFOGRAPHIC ILLUSTRATES THE SAFE DISTANCE BETWEEN HUMANS AND DIFFERENT TYPES OF ANIMALS. view more 

CREDIT: SARAH MARKES/WCS

Spending time outdoors is good for a person's body and soul, but how good is it for the wildlife around us?

Outdoor recreation has become a popular activity, especially in the midst of a pandemic, where access to indoor activities might be limited. Long known to have negative behavioural and physiological effects on wildlife, outdoor recreation is one of the biggest threats to protected areas. Human disturbance to animal habitats can lower their survival and reproduction rates, and ultimately shrink populations or eradicate them from areas where they would otherwise thrive. Still, park planners and natural resource managers often can't find clear recommendations on how to limit these impacts.

new scholarly article in the open-access, peer-reviewed journal Nature Conservation from researchers at the Wildlife Conservation Society looked at nearly 40 years of research on recreation impacts on wildlife to try to find the point where recreation starts to impact the wildlife around us. Knowing when and to what extent a species is being disturbed can ultimately allow for more informed and effective management decisions and increase the chances of its successful conservation.

The researchers found that the impact or uncomfortable distance to humans, vehicles or trails for shorebirds and songbirds was as short as 100 meters or even less, whereas for hawks and eagles it was greater than 400 meters. For mammals, it varied even more widely, with an impact threshold of 50 meters for medium-sized rodents. Large ungulates - like elk - would rather have to stay 500 to 1,000 meters away from people.

While human disturbance thresholds can vary widely, large buffer zones around human activities and controlled visitation limits should always be considered during planning and maintenance of parks and protected areas. Based on their findings, the authors recommend that human activities should be considered to be impacting wildlife at least 250 metres away. Further, they call for future research to explicitly identify points where recreation begins or ends to impact wildlife.

Original source: Dertien JS, Larson CL, Reed SE (2021) Recreation effects on wildlife: a review of potential quantitative thresholds. Nature Conservation 44: 51-68. https://doi.org/10.3897/natureconservation.44.63270


CAPTION

Human recreation and wildlife often overlap. Here an American black bear and hikers use the same trail hours apart in Sonoma County, California, USA

CREDIT

Wildlife Conservation Society