Archive for lynx

Nature tidbits [06 Feb 2025]

Posted in Statistics with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on March 10, 2025 by xi'an

Entries about the scary rise in H5N1 risks of a human transmission, compounded by Trump’s America leaving WHO, hence the US connection with global monitoring and its substantial funding of the organization. Advising against drinking raw milk as a primary precaution. Even camembert?!

A (naïve, imho) call by the presidente of the Union of Concerned Scientists to boost scientific integrity to protect (US) federal research despite the chainsaw massacre unfolding daily in (US) federal agencies. And the disregard of said massacrers for accountability and legal boundaries. And unions, definitely unions.

Also entries (and two Nature collections) on the one hundredth anniversary of the Taung Child fossil uncovering, as the first Australophitecus africanus  that opened the way for the theory that Africa was the birthplace of humanity, along with other extended books reviews. On quantum theory (it’s complicated!, according to Sean Carroll) and Kepler mission (by Jason Steffen). And a show at Cité des Sciences in La Villette about silence that I would love to attend.

A quick assessment of deepseek against its competitors. Mostly praising its open code. And another one on 23andMe losses and trouble,  reflecting the one-shot strategy of the company that cannot sell its analysis more than once (despite repeatedly trying, as I can confirm from their frequent emails). And opening concerns about their data or rather our data. Since there is very little protection in the US for this kind of data, considered out of healthcare.

New challenges of large carnivores in Western Europe, with a rise of wolverines, success story for the Iberian lynx, talks of reintroducing wolves to Scotland (to cull red deer like those who roam Buachaille Mor), degrading setting in France with looser rules for shooting wolves.

Microplastics in the brain, unsurprisingly increasing the chances of clots and surprisingly easily moving into blood vessels and the brain. And, speakiMicroplastics in the brainng of plastic, recycling, at last? Warwick Manufacturing Group (WMG) mentioned as evaluating the life-cycle analysis of a new approach with superheated water. Exposing the elephant in the room, namely that there is very little true recycling going on and that part of the recycled plastic ends up as fuel, hence contributing to pollution. Costs and impact of turning used products into new material are mentioned (and staggering albeit not compared with the initial costs and impact.

And I remain perplexed by the Two-Eyed Seeing Indigenous perspective for neuroscience article. As I do not see the scientific component, besides directions to work with local communities.

chain of lynx and drove of hares

Posted in Books, Kids, pictures, R, Statistics with tags , , , , , , , , , on February 27, 2020 by xi'an

A paper (and an introduction to the paper) in Nature this week seems to have made progress on the existence of indefinite predator-prey cyles. As in the lynx/hare dataset available on R. The paper is focusing on another pair, an invertebrate and its prey, an algae. For which the authors managed a 50 cycle sequence. What I do not get about this experiment is how the cycle can be tested via a rigorous statistical experiment.

“…the predator–prey system showed a strong tendency to return to the dominant dynamical regime with a defined phase relationship. A mathematical model suggests that stochasticity is probably responsible for the reversible shift from coherent to non-coherent oscillations, a notion that was supported by experiments with external forcing by pulsed nutrient supply.”

As I had not renewed my subscription to Nature in time, I could not check the additional material for details, but the modelling seems to involve a wavelet decomposition of the bivariate time series, with correlations between the two series…