Saturday, January 07, 2006

coevolution ...

anchoring must necessarily occur in any physically embedded system that comprises a symbolic reasoning component.

environments simply are not fixed places that living things must fit into, adapt to, but the busy activity of living things themselves, working out their ways of life together as parts of the live earth. coevolution in eco-systems now seems a matter of creatures changing themselves from the inside, in response to their environment, and prodding changes in other creatures that are part of their environment. a change in one species will thus be reflected by changes in some others. each species is continually incorporating raw materials into its bodies, and being transformed in turn into raw materials for others.
coevolution happens when two or more species reciprocally influence each other's evolution. it is most often invoked to explain coadaptations and dependence between species. parasites and hosts, is an example of antagonistic coevolution, which can lead to evolutionary 'arms races'.
insects and plants influence each other's evolution, by the evolution of insecticides in plants and of detoxification and avoidance mechanisms in insects. evolutionary relations between insects and plants less often take the form of coevolution than of sequential evolution, in which plant evolution influences insect evolution but not vice versa.
the level of virulence of parasites can evolutionarily decrease or increase. two factors that influence it are kin selection and the mode of transmission of the parasite between hosts.
coevolutionary “arms races” between predators and prey may often show an evolutionary pattern called escalation. we must distinguish escalation from evolutionary progress. if evolution is progressive, organisms will become better adapted to their surroundings through evolutionary time, if it is escalatory, the improvement in predatory adaptations may be matched by improvements in prey defences/deteriotion, and neither ends up any better off.
it is indeed in the long-term interest of a parasite species not to destroy the resource it lives off. rates of change, and relative competitive abilities, need not be constant.
the main point is that any old interaction, symbiosis, mutualism, etc. is not synonymous with coevolution.

18 Comments:

Blogger Bob said...

interesting.

9:32 PM  
Blogger wildpic said...

u always impress me rob, am someone who likes to read more than whats read ... your plain english is facinating ...it leaves all doors and windows open !

cheers !

10:08 PM  
Blogger rauf said...

Suresh its
wwwwwwwww.nature.org sorry I can't put 4 w's up and 4 w's down and connect them.
Our single DNA molecule is a universe itself, like the universe around us its constantly changing

10:10 PM  
Blogger rauf said...

I mean our cells
DNA is constant

10:17 PM  
Blogger Darlene said...

In essence, anchoring meets establishing roots, so that from there we can branch out. Even dreamers need an anchor so they are free to dream. Thanks for this thought-provoking post!

3:48 AM  
Blogger Bob said...

"Listen a lot, say little and write nothing" is the safest policy.

4:09 AM  
Blogger Patty said...

Beautiful picture! It looks so much like one of those man-made insect pins/broaches that women(not me of course) wear for decoration. The eyes appear as if they are tiny emeralds.

What I'm trying to say is-great photo.

:)

11:13 AM  
Blogger Claude Richard said...

Very interesting topics et beautiful pictures.

Happy New Year !

6:54 PM  
Blogger Wendy C. said...

Wildpic - your pictures are such a blessing to me...I could just sit quietly and look and look...my whole mind just stops chattering and pays attention...fascinating.

6:06 AM  
Blogger wildpic said...

rauf, that site needs money and am not there yet !

deoxyribonucleic acid (DNA) contains the genetic instructions, mostly in the cell nucleus, specifying the biological development of all cellular forms of life, its constantly changing all the time. u were right the first time.

cells are the "building blocks of life" some organisms such as bacteria, are unicellular, humans are multicellular, have an estimated 100,000 billion of them.

every boundry contains a universe, at any and every level and sphere !

12:57 PM  
Blogger wildpic said...

In essence, anchoring meets establishing roots, so that from there we can branch out. Even dreamers need an anchor so they are free to dream.

darlene, you put it soo ... beautifully, its so universal with any physical, metaphysical, spiritual state of branching and connecting.

:)

12:58 PM  
Blogger wildpic said...

rob, i agree and disagree ... but hey it all bepends on what policy aye !

but you are one solid safe ! :)

1:02 PM  
Blogger wildpic said...

hi patty ... yes, sometimes i wonder how we relate what came second to the first. nature produces some awesome gems !

thanks a lot patty, the picture makes it look big but its a tiny insect.

have a good day :)

1:02 PM  
Blogger wildpic said...

hello crescendo ... am happy you find it so, thank you very much and for droppin by.

wish u a lovely new year, filled with discovery, meaning, joy and good health !

1:03 PM  
Blogger wildpic said...

hello wendy ... your comment is so wonderfull that am taking my pictures seriously ... !

am so glad u feel so, my efforts and joy are worth it ! ... theres more coming ...

take good care, see you soon ...

1:04 PM  
Blogger Jorge Paulo said...

Hey Suresh !

Great stuff as always...how about putting up more info on the western ghats....its unique ecosystem, co-ordinates, significance etc ..these amazing pics that you have already posted will then be the little dots that form the BIG PICTURE.. just a thought !

compliments of the season to all ....

1:08 PM  
Blogger wildpic said...

hey jrg, complements for the season, thank you.

do have ideas regarding posting the significance of western ghats and the conservational issues related and pertaining. before that theres so much to map out regarding general wild life and their laws governing.

keep watching ! thanks for the suggestion.

cheers

8:21 PM  
Blogger radha said...

Nice post. Keep updating Artificial Intelligence Online Training

6:09 PM  

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