Group items tagged

The complexity of an ecological community can be distilled into a network, where diverse interactions connect species in a web of dependencies. Species interact directly with each other and indirectly through environmental effects, however to our knowledge the role of these ecosystem engineers has not been considered in ecological network models. Here we explore the dynamics of ecosystem assembly, where species colonization and extinction depends on the constraints imposed by trophic, service, and engineering dependencies. We show that our assembly model reproduces many key features of ecological systems, such as the role of generalists during assembly, realistic maximum trophic levels, and increased nestedness with mutualistic interactions. We find that ecosystem engineering has large and nonlinear effects on extinction rates. While small numbers of engineers reduce stability by increasing primary extinctions, larger numbers of engineers increase stability by reducing primary extinctions and extinction cascade magnitude. Our results suggest that ecological engineers may enhance community diversity while increasing persistence by facilitating colonization and limiting competitive exclusion.

"Global history faces two seemingly opposite challenges for an inter-dependent, over-heating planet. If we are going to muster meaningful narratives about the togetherness of strangers near and far, we are going to have to be more global and get more serious about engaging other languages and other ways of telling history. Historians and their reader-citizens are also going to have to re-signify the place of local attachments and meanings. Going deeper into the stories of Others afar and Strangers at home means dispensing with the idea that global integration was like an electric circuit, bringing light to the connected. Becoming inter-dependent is not just messier than drawing a wiring diagram. It means reckoning with dimensions of networks and circuits that global historians - and possibly all narratives of cosmopolitan convergence - leave out of the story: lighting up corners of the earth leaves others in the dark.  The story of the globalists illuminates some at the expense of others, the left behind, the ones who cannot move, and those who become immobilised because the light no longer shines on them."

As social distancing became norm and law in the early days of the Covid-19 pandemic, people turned to video teleconferencing to meet with friends and family, attend religious services, and go on dates. Zoom work accounts became a conduit for maintaining nonwork social ties, and as people came to depend on this enterprise tool, Zoom's stock valuation soared.1 The pandemic has widened the sphere of life dependent on such market technologies, heightening existing questions around the political, legal, and economic governance of these companies. How should the fabric of social life, especially as it is rewoven by the pandemic, relate to the private ownership of telecommunications?

When they are strict and prolonged, the public health and social measures to contain Covid-19 have proven difficult to respect. This column gives evidence of the different outcomes, as of 23 May, across a sample of 20 tourist-dependent island states with populations of between 100,000 and 10 million. If tourist-dependent islands have been hit hard by the shock, most have fared well, particularly those - like Mauritius - that acted early and imposed a strict lockdown.

"With each interaction, Alexa is training to hear better, to interpret more precisely, to trigger actions that map to the user's commands more accurately, and to build a more complete model of their preferences, habits and desires. What is required to make this possible? Put simply: each small moment of convenience - be it answering a question, turning on a light, or playing a song - requires a vast planetary network, fueled by the extraction of non-renewable materials, labor, and data. The scale of resources required is many magnitudes greater than the energy and labor it would take a human to operate a household appliance or flick a switch. A full accounting for these costs is almost impossible, but it is increasingly important that we grasp the scale and scope if we are to understand and govern the technical infrastructures that thread through our lives. III The Salar, the world's largest flat surface, is located in southwest Bolivia at an altitude of 3,656 meters above sea level. It is a high plateau, covered by a few meters of salt crust which are exceptionally rich in lithium, containing 50% to 70% of the world's lithium reserves. 4 The Salar, alongside the neighboring Atacama regions in Chile and Argentina, are major sites for lithium extraction. This soft, silvery metal is currently used to power mobile connected devices, as a crucial material used for the production of lithium-Ion batteries. It is known as 'grey gold.' Smartphone batteries, for example, usually have less than eight grams of this material. 5 Each Tesla car needs approximately seven kilograms of lithium for its battery pack. 6 All these batteries have a limited lifespan, and once consumed they are thrown away as waste. Amazon reminds users that they cannot open up and repair their Echo, because this will void the warranty. The Amazon Echo is wall-powered, and also has a mobile battery base. This also has a limited lifespan and then must be thrown away as waste. According to the Ay

Depending on how you look at it, this technology is a powerful bullshit machine or a promising tool for artists. So far, the creative uses seem to outnumber the malicious ones, but it's not difficult to imagine how text-fakes could cause harm, especially since these models have been widely shared and are now deployable by anyone with basic know-how.

" Fearless commentary on finance, economics, politics and power Follow yvessmith on Twitter Feedburner RSS Feed RSS Feed for Comments Subscribe via Email SUBSCRIBE Recent Items Links 3/11/17 - 03/11/2017 - Yves Smith Deutsche Bank Tries to Stay Alive - 03/11/2017 - Yves Smith John Helmer: Australian Government Trips Up Ukrainian Court Claim of MH17 as Terrorism - 03/11/2017 - Yves Smith 2:00PM Water Cooler 3/10/2017 - 03/10/2017 - Lambert Strether Why a 400-Year Program of Modernist Thinking is Exploding - 03/10/2017 - Yves Smith Links 3/10/17 - 03/10/2017 - Yves Smith Why It Will Take a Lot More Than a Smartphone to Get the Sharing Economy Started - 03/10/2017 - Yves Smith CalPERS' General Counsel Railroads Board on Fiduciary Counsel Selection - 03/10/2017 - Yves Smith Another Somalian Famine - 03/10/2017 - Yves Smith Trade now with TradeStation - Highest rated for frequent traders Why a 400-Year Program of Modernist Thinking is Exploding Posted on March 10, 2017 by Yves Smith By Lynn Parramore, Senior Research Analyst at the Institute for New Economic Thinking. Originally published at the Institute for New Economic Thinking website Across the globe, a collective freak-out spanning the whole political system is picking up steam with every new "surprise" election, rush of tormented souls across borders, and tweet from the star of America's great unreality show, Donald Trump. But what exactly is the force that seems to be pushing us towards Armageddon? Is it capitalism gone wild? Globalization? Political corruption? Techno-nightmares? Rajani Kanth, a political economist, social thinker, and poet, goes beyond any of these explanations for the answer. In his view, what's throwing most of us off kilter - whether we think of ourselves as on the left or right, capitalist or socialist -was birthed 400 years ago during the period of the Enlightenment. It's a set of assumptions, a particular way of looking at the world that pushed out previous modes o

"The trouble with empires is that so much depends upon their emperors, and the trouble for emperors is how little they matter to their empires. No Caesar could end Rome by accident, no matter how myopic or incompetent they could be. Not the madman Caligula, not the idiot Commodus, not the vainglorious Maximinus Thrax - the border might wax or wane, but it made no difference really. Even Caracella, who sacked his own city of Alexandria for staging a funny play at his expense, couldn't ruin the whole empire. The empire just stabbed him in the back and carried on."

"Stoll offers the ideal complement. He has set out to tell the story of how the people of a sprawling region of our country - one of its most physically captivating and ecologically bountiful - went from enjoying a modest but self-sufficient existence as small-scale agrarians for much of the 18th and 19th centuries to a dreary dependency on the indulgence of coal barons or the alms of the government."

Since the emergence of coronavirus disease 2019 (COVID-19), unprecedented movement restrictions and social distancing measures have been implemented worldwide. The socioeconomic repercussions have fueled calls to lift these measures. In the absence of population-wide restrictions, isolation of infected individuals is key to curtailing transmission. However, the effectiveness of symptom-based isolation in preventing a resurgence depends on the extent of presymptomatic and asymptomatic transmission. We evaluate the contribution of presymptomatic and asymptomatic transmission based on recent individual-level data regarding infectiousness prior to symptom onset and the asymptomatic proportion among all infections. We found that the majority of incidences may be attributable to silent transmission from a combination of the presymptomatic stage and asymptomatic infections. Consequently, even if all symptomatic cases are isolated, a vast outbreak may nonetheless unfold. We further quantified the effect of isolating silent infections in addition to symptomatic cases, finding that over one-third of silent infections must be isolated to suppress a future outbreak below 1% of the population. Our results indicate that symptom-based isolation must be supplemented by rapid contact tracing and testing that identifies asymptomatic and presymptomatic cases, in order to safely lift current restrictions and minimize the risk of resurgence.

The systems we use to encode expertise tend to depend on relatively slow processes of collective computation and don't typically work as measures of an individual's actual extra-institutional networks or their ability to respond to novelty. Organizations and metrics tuned to slow and stable periods that favor efficiency and specialization tend to suppress generalists and improvisation.