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Author Topic: Effects of Climate Change on the biosphere  (Read 7344 times)

Sigmetnow

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Re: Effects of Climate Change on the biosphere
« Reply #50 on: July 17, 2017, 09:25:14 PM »
Tasmania's fisheries cooked by record-breaking marine heatwave
Climate change was almost certainly responsible for a marine heatwave off Tasmania's east coast in 2015/16 that lasted 251 days and at its greatest extent had an area of impact seven times the size of Tasmania, according to a new study published today in Nature Communications.

The marine heat wave reduced the productivity of Tasmanian salmon fisheries, led to a rise in Blacklip abalone mortality, sparked an outbreak of Pacific Oyster Mortality Syndrome and saw new fish species move into Tasmanian waters....
https://phys.org/news/2017-07-tasmania-fisheries-cooked-record-breaking-marine.html
People who say it cannot be done should not interrupt those who are doing it.

Archimid

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Re: Effects of Climate Change on the biosphere
« Reply #51 on: August 01, 2017, 04:00:22 AM »
What City Ants Can Teach Us About Species Evolution And Climate Change

https://undark.org/article/urban-ants-evolution-climate-change/

Is the rapid evolution of a certain ant species to urban environments a preview of life on a warming planet? Some researchers are trying to find out.

I'm positive that in 20 generations humanity would have completely adapted to climate change.
I am an energy reservoir seemingly intent on lowering entropy for self preservation.

Forest Dweller

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Re: Effects of Climate Change on the biosphere
« Reply #52 on: August 01, 2017, 07:15:11 AM »
Beckwith has some new videos discussing the book "Scale" and several related papers.

https://youtu.be/0oCfy5SU-_4

"For every 18 F (10 C) rise in temperature the metabolic rate doubles & thus the rate of living (pace of life) doubles.

The Paris agreement aims for a maximum 2 C (3.6 F) temperature rise, yet this change leads to a 20% to 30% increase in metabolic rate, and thus also growth & mortality rates. This is mind-boggling. The pace of almost all biological life across all size scales increases 20 to 30% from just a 2 C temperature rise.

This will wreak havoc on ecosystems; in fact the entire planetary ecology. Including global food supply."

Interesting stuff, i'm sure there will be controversy...

Andre

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Re: Effects of Climate Change on the biosphere
« Reply #53 on: August 02, 2017, 05:08:07 AM »
Previous mass extinctions might help us to understand more about our current situation:

Underground magma triggered Earth’s worst mass extinction with greenhouse gases
There are parallels between today’s and past greenhouse gas-driven climate changes

https://www.theguardian.com/environment/climate-consensus-97-per-cent/2017/aug/01/underground-magma-triggered-earths-worst-mass-extinction-with-greenhouse-gases?CMP=Share_iOSApp_Other

Abstract:

Coincidence doesn’t prove causality, as they say, but when the same two things happen together over and over again through the vast span of geological time, there must be a causal link. Of some 18 major and minor mass extinctions since the dawn of complex life, most happened at the same time as a rare, epic volcanic phenomenon called a Large Igneous Province (LIP). Many of those extinctions were also accompanied by abrupt climate warming, expansion of ocean dead zones and acidification, like today.

[...]

The more science learns of these past greenhouse gas-driven events, the more uncomfortable the parallels to today become. I asked Burgess if it was ridiculous to make the comparison.

"No, I don’t think the comparison is ridiculous at all, and I think that the timescales over which the environment changes associated with mass extinctions are frighteningly similar to the timescales over which our current climate is changing. The cause might be different but the hallmarks are similar."

Geologically fast build-up of greenhouse gas linked to warming, rising sea-levels, widespread oxygen-starved ocean dead zones and ocean acidification are fairly consistent across the mass extinction events, and those same symptoms are happening today as a result of human-driven climate change. Even though the duration of those past events was longer, and the volume of emissions was larger than we will produce, we are emitting greenhouse gases around 10 times faster than the most recent, mildest example – the PETM. The rapidity of today’s emissions prompted scientists Richard Zeebe and James Zachos to observe in a 2013 paper:

"The Anthropocene will more likely resemble the end-Permian and end-Cretaceous disasters, rather than the PETM."




sidd

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Re: Effects of Climate Change on the biosphere
« Reply #54 on: August 02, 2017, 09:09:47 PM »
Whitebark pines disappearing. I recently saw massive decline of these and lodgepole and ponderosa in that region. The article gives a detailed analysis

https://www.counterpunch.org/2017/08/01/the-late-great-whitebark-pine/

AbruptSLR

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Re: Effects of Climate Change on the biosphere
« Reply #55 on: September 07, 2017, 07:21:22 PM »
The Earth's ecosystems are likely more sensitive to climate change impacts than previously appreciated:

Title: "As many as one in three parasites could become extinct as a result of climate change by 2070, new research suggests."

https://www.carbonbrief.org/climate-change-drive-third-parasites-extinction-2070

Extract: "The destabilisation of ecosystems as a result of parasite loss could lead to waves of species extinction, he adds, affecting every level of the ecosystem, from plants to top-level predators. 

“It means extinctions might keep happening downstream, but more broadly it means ecosystems might change in pretty unexpected ways.”"

See also:

Carlson, C. J. et al. (2017), "Parasite biodiversity faces extinction and redistribution in a changing climate", Science Advances, http://advances.sciencemag.org/content/3/9/e1602422
“It is not the strongest or the most intelligent who will survive but those who can best manage change.”
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