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Peak Civilisation is in the rear view mirror for most humans on the planet. Economies, lifestyles & environment are declining almost everywhere. Overpopulation, resource depletion, pollution & energy decline continue to exacerbate the problems. Available net energy is the determinant of the quality & complexity of civilisation. As the inexpensive, easy to get energy sources decline, disorder in human systems & the biosphere will increase.. Entropy (disorder, randomness) increases.
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Global Warming Effects; Trees Are Climbing Higher Up Mountains To Escape The Heat.

Climate change pushing tropical trees upslope ‘exactly as predicted’ – ‘Dieback is happening much faster than expansion’

(mongabay.com) – Tropical tree communities are moving up mountainsides to cooler habitats as temperatures rise, a new study in Global Change Biology has found. By examining the tree species present in ten one-hectare plots at various intervals over a decade, researchers found that the proportion of lowland species increased in the plots at higher elevations. The study, which was undertaken in Volcán Barva, Costa Rica, adds to a growing body of evidence that climate change is having an impact on species range distributions.

As climate change leads to warmer temperatures, species must respond if they are to survive. One way to do this is to migrate to new habitats that become suitable (and away from old ones that become unsuitable); another way is to adapt to hotter temperatures, but the speed of climate change may be too fast for some species to evolve to keep up. In some cases, if their physiology permits it, species may be capable of tolerating increases in temperature, but the likelihood of this is unknown.

The researchers first turned to herbarium records to calculate the preferred temperature of thousands of tree species, by looking at the geographic location of sampling locations and the temperature ranges they encompassed. With the temperature preferences for each species known, it was then possible to calculate a ‘community temperature score’ for each of the ten study plots, by averaging the preferred temperatures of all species present. A high community temperature score indicated an abundance of species found in the hot lowlands, whereas a low community temperature score reflected the presence of high altitude species from cooler habitats.

Plots were monitored over the course of a decade, and in nine of the ten plots the community temperature score increased. This indicates a shift in species composition, with the relative abundance of lowland species increasing over time “exactly as predicted under climate-driven upward species migrations,” Kenneth Feeley, lead author of the study with Florida International University and Fairchild Tropical Botanic Garden, 

From; http://www.desdemonadespair.net/2013/10/climate-change-pushing-tropical-trees.html

Posted on Saturday, October 19th 2013

Tags global warming species migration biodiversity loss environmental decline