Tanada wrote:Ibon what do you think of the theory of keystone species? From all my studies on the topic of the ecosystem it seems to me the 'keystone' concept is very weak because nearly every set of interlocking factors studied was in an already deeply disturbed location where humans had been causing significant changes for centuries to millennia.
My formal education was a BS degree in ecology but my area of focus has always been biogeography and I have spent a lifetime reading ecological books and articles related to this field along with countless thousands of hours in temperate and tropical habitats, in disturbed and undisturbed areas. This is the subject where I am most able to competently contribute opinions and conjectures which all of us should remember is mostly what we do here often offering up links that support our suppositions. At best as a community we do act somewhat like a very very amateur academic institution in that we can peer review each others posts. Let's just have the humility to recognize that we are amateurs but there are nuggets of gold among the often sophomoric diatribes
That is where this site is at its best by the way. And actually, real academia has turf wars and opinions sometimes as heated and opinionated as we can see here at po.com.
Something else worth mentioning. Many of us here focus on the interplay and confluence of macro phenomenon. Like the interplay between politics, economic system, peak oil, climate change and overpopulation. That's all big systemic topics. The more you immerse yourself on these macro phenomenon and how the inter related they are the more your knowledge results in a big picture synthesis. So much of this is conjecture because we don't have real long term academic research in this area.
Here at Totumas I get all kinds of research biologists who are micro focused on a specific family of insects or orchids and many of these individuals are incredibly knowledgeable in a very narrow field and if I bring up a more macro topic that requires synthesis of big macro phenomenon like peak oil often they look at me squinty eyed from their acute micro world view and usually just give the same opinions like the status quo.... "there is plenty of oil" , "new technology will come along" etc. etc. Of course many do get it but you guys would be surprised how many don't.
A very well known evolutionary biologist and paleontologist Stephen Jay Gould (who went to the same university as an undergraduate that I did, Antioch College in Yellow Springs Ohio) together with Niles Eldredge, developed this theory of punctuated equilibrium back in the early 70's in regards to evolution and speciation.
Gould discovered that the fossil record shows long periods of equilibrium with stable habitats and slower speciation punctuated by times of accelerated extinctions and speciation. Aspects of his theory have been disputed but the basic theory is correct.
Reading any of his popular books is a highly recommended and his writings greatly influenced my ecological world view. Gould was a paleontologist and evolutionary biologist and why he was even able to discover this theory of punctuated equilibrium was because he was able to interpret fossils from a big picture synthesis of paleontology and evolutionary biology. A good example of the power of big picture synthesis.
https://en.wikipedia.org/wiki/Stephen_Jay_GouldTake another popular natural history writer, John McPhee, a geologist, has written many books that talk about our deep geological past. He also synthesized big topics. Just read this summary of Basin and Range, one of his books:
http://www.amazon.com/Basin-Range-John- ... 0374516901The first of John McPhee's works in his series on geology and geologists, Basin and Range is a book of journeys through ancient terrains, always in juxtaposition with travels in the modern world―a history of vanished landscapes, enhanced by the histories of people who bring them to light. The title refers to the physiographic province of the United States that reaches from eastern Utah to eastern California, a silent world of austere beauty, of hundreds of discrete high mountain ranges that are green with junipers and often white with snow. The terrain becomes the setting for a lyrical evocation of the science of geology, with important digressions into the plate-tectonics revolution and the history of the geologic time scale.Many other well know popular authors like Jared Diamond derive their work on synthesis of big topics.
So Tanada, I wandered afar from you question of Keystone species. You are mostly right but interestingly enough Stephen Jay Gould hit on the fact that our biosphere and web of life on the planet looking at the fossil record reveals long long periods of stasis with relatively little extinctions and new speciation punctuated by periods of increased extinctions and rapid acceleration of new speciation.
It is these punctuated moments that are fascinating in the fossil record.
How that is relevant to our modern times is quite relevant, in fact our species mirrors the general ecological phenomenon of punctuated equilibrium. Here we where for hundreds of thousands of years in stasis, held within carrying capacity, going along in equilibrium in the co habitation with other life forms and Bang, we are now at a punctuated moment.
Both positions are correct actually when Pops for example argues a more tempered position that humanity will not collapse and die-off instantly and he comes from his bias of focus on the equilibrium. Then Cid Yama comes along or Kaiser Jeep pointing out all these impending tipping points that will reduce out planet to ash and radiation and toxic anaerobic hydrogen sulfide ball of rotten egg smell ha ha
The highly resilient biosphere is approaching a punctuated moment. No doubt. Caused by us.
OK, I have rambled long on this post and didn't even answer your questions about keystone species. I'll get to it tomorrow morning with my morning coffee.. Chores and tasks are calling, we have a wave of guests arriving soon. I'll back to your question.
Patiently awaiting the pathogens. Our resiliency resembles an invasive weed. We are the Kudzu Ape
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