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I am very interested in the evolution of the evolution process itself. There are of course a lot of things that influence how evolution will work, but for this question, I am interested in things that are only related to the evolution process. Examples could be increase chance of mutations in newborns, change in reproduction age, and similar. I am specifically interested in observation where the evolution process itself has adapted to a change in the environment.

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Nick's answer here is a bit off base. You could look at cells of the immune system as doing something similar to evolving (there is selection, etc.). But these changes are not passed on to progeny through the germ line. –  Dr. T Aug 8 '13 at 18:42
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I think humans have changed their reproduction age back and forth several times during their evolution. I recall hearing about geographical differences for entry into puberty age as well. –  skymninge Aug 9 '13 at 8:57
    
Species with parthenogenesis come to mind. Not observed but obviously adaptation from loosing all the males. –  fredsbend Jan 12 at 23:25
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up vote 24 down vote accepted

Bacteria such as E. coli are known to increase their mutation rate (by switching to a more error prone polymerase among other things) when under stress. This can mean being placed in a medium where it's not adapted to grow (http://www.micab.umn.edu/courses/8002/Rosenberg.pdf) or when treated with antibiotics (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088971/?tool=pmcentrez).

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Pigliucci gives a good review of some aspects of this topic in "Is evolvability evolvable?" (2008). He sees what you're asking about, which he calls "evolvability", as one of the key topics for the future of the study of evolution.

It's very conceptually dense evo-devo-theory, so I'll probably do a poor job trying to explain it, but he tries to set up a framework that deals not just with things like life-history (per kmm's answer) and mutation/recombination rate (low fidelity in HIV per GWW's answer, and, I suppose, the evolution of sex itself), but also with constraints that evolve at various levels to "positively channel" mutation (that is, the understanding that while mutations are effectively random, the phenotypes that emerge, and are acted upon by natural selection, are not random, but are channelled by the developmental system of the organism).

He also includes the role of development in opening up "phenotypic space" into which a lineage may evolve. For instance, single-celled organisms have a limit on size and complexity, the evolution of multicellularity opens up this huge zone of evolvability. In a sense, this is also the "evolution of evolution".


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If you look at the adaptive immune system, the process of B-cell recombination, clonal expansion and somatic hypermuation is, in essence, induced evolution.

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Species have been observed in controlled experiments to use different sources of energy, for instance axenic E. coli cultures picking up citrate metabolism in Lenski's Lab at MSU. They have also shown that mutations to the mutator gene mutT can accelerate the process of evolution, though it's evolution directed by fitness in a very specific setting.

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The "change in reproduction age" you mention is one major aspect of life history evolution.

A massive literature exists on this topic, including several books: e.g., The evolution of life histories: Theory and analysis (Roff, 1992) and The evolution of life histories (Stearns, 1992).

Reznick and various colleagues have carried out extensive studies of experimental life history evolution in Trinidadian guppies going back ~30 years. For example:

Life history evolution has also been documented in response to human pressures. Fisheries stocks are evolving in response to overfishing. For example:

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I think this falls into your criteria but correct me if i'm wrong :).

The HIV reverse transcriptase protein has evolved to have relatively low fidelity (leading to a high mutation rate in replicated virus particles). Reverse transcriptase is also recombinogenic, ie. it can switch templates during replication leading to even more variability. Combined, these two properties lead to each individual having a large number of variant viral genomes, which leads to increased resistance to antiretroviral drugs etc.

EDIT:

I thought of influenza as a second example. The viral genome has evolved to be fragmented into 7-8 pieces of RNA, which can be swapped with other strains during co-infection of a single cell. This can lead to more virulent or transmissible strains of influenza; these can also be helpful to create new strains that influenza vaccines are no longer useful against.

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How about species actively changing the factors that play a role in the selection process?

Humans are a species that have heavily modified this process. In the western world, we have gone away from selection by survival skills and genetic fitness to move to a social selection, where genome is secondary to social skills and adaptation to fashion, which are acquired skills.

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I don’t think this entails a change in the underlying mechanism. At least, not one that has been demonstrated yet. “social selection” is a very diffuse term. Does it actually differ from natural selection? Personally, I doubt it: it can be readily explained in terms of natural and sexual and kin selection so this would be the most parsimonious explanation. –  Konrad Rudolph Dec 29 '11 at 9:10
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