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02.10.12
Posted in General at 1:48 pm by nemo
http://whyevolutionistrue.wordpress.com/2012/02/10/the-peppered-moth-story-is-solid/
The peppered moth story is one of the most ridiculous in the Darwin canon: the issue is that microevolution is not evolution. I don’t think anyone is contestint the place of natural selection in microevolution. But is this ‘evolution’?
Permalink
Enezio E. de Almeida Filho said,
February 11, 2012 at 5:18 am
This Biology Letters (The Royal Society) article on peppered moth is quite interesting:
Selective bird predation on the peppered moth: the last experiment of Michael Majerus
L. M. Cook1, B. S. Grant2, I. J. Saccheri3 and J. Mallet4,5,*
Author Affiliations
1Life Sciences, University of Manchester, Manchester M13 9PT, UK
2Department of Biology, College of William and Mary,Williamsburg, VA 23187, USA
3Institute of Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK
4Genetics Evolution and Environment, UCL, 4 Stephenson Way, London NW1 2HE, UK
5Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
*Author for correspondence (jmallet@oeb.harvard.edu).
Abstract
Colour variation in the peppered moth Biston betularia was long accepted to be under strong natural selection. Melanics were believed to be fitter than pale morphs because of lower predation at daytime resting sites on dark, sooty bark. Melanics became common during the industrial revolution, but since 1970 there has been a rapid reversal, assumed to have been caused by predators selecting against melanics resting on today’s less sooty bark. Recently, these classical explanations of melanism were attacked, and there has been general scepticism about birds as selective agents. Experiments and observations were accordingly carried out by Michael Majerus to address perceived weaknesses of earlier work. Unfortunately, he did not live to publish the results, which are analysed and presented here by the authors. Majerus released 4864 moths in his six-year experiment, the largest ever attempted for any similar study. There was strong differential bird predation against melanic peppered moths. Daily selection against melanics (s ? 0.1) was sufficient in magnitude and direction to explain the recent rapid decline of melanism in post-industrial Britain. These data provide the most direct evidence yet to implicate camouflage and bird predation as the overriding explanation for the rise and fall of melanism in moths.
natural selection, cryptic coloration, ecological genetics, insectivorous birds, melanism, lepidoptera
Received November 22, 2011.
Accepted January 13, 2012.
This journal is © 2012 The Royal Society
+++++
FREE FULL PDF AND SUPPLEMENTARY INFO:
http://rsbl.royalsocietypublishing.org/content/early/2012/01/27/rsbl.2011.1136.full.pdf+html
http://rsbl.royalsocietypublishing.org/content/suppl/2012/01/31/rsbl.2011.1136.DC1/rsbl20111136supp1.pdf
http://rsbl.royalsocietypublishing.org/content/suppl/2012/01/31/rsbl.2011.1136.DC1/rsbl20111136supp2.pdf
http://rsbl.royalsocietypublishing.org/content/suppl/2012/01/31/rsbl.2011.1136.DC1/rsbl20111136supp3.pdf
Enezio E. de Almeida Filho said,
February 11, 2012 at 5:19 am
This Biology Letters (The Royal Society) article on peppered moth is quite interesting:
Selective bird predation on the peppered moth: the last experiment of Michael Majerus
L. M. Cook1, B. S. Grant2, I. J. Saccheri3 and J. Mallet4,5,*
Author Affiliations
1Life Sciences, University of Manchester, Manchester M13 9PT, UK
2Department of Biology, College of William and Mary,Williamsburg, VA 23187, USA
3Institute of Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK
4Genetics Evolution and Environment, UCL, 4 Stephenson Way, London NW1 2HE, UK
5Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
*Author for correspondence (jmallet@oeb.harvard.edu).
Abstract
Colour variation in the peppered moth Biston betularia was long accepted to be under strong natural selection. Melanics were believed to be fitter than pale morphs because of lower predation at daytime resting sites on dark, sooty bark. Melanics became common during the industrial revolution, but since 1970 there has been a rapid reversal, assumed to have been caused by predators selecting against melanics resting on today’s less sooty bark. Recently, these classical explanations of melanism were attacked, and there has been general scepticism about birds as selective agents. Experiments and observations were accordingly carried out by Michael Majerus to address perceived weaknesses of earlier work. Unfortunately, he did not live to publish the results, which are analysed and presented here by the authors. Majerus released 4864 moths in his six-year experiment, the largest ever attempted for any similar study. There was strong differential bird predation against melanic peppered moths. Daily selection against melanics (s ? 0.1) was sufficient in magnitude and direction to explain the recent rapid decline of melanism in post-industrial Britain. These data provide the most direct evidence yet to implicate camouflage and bird predation as the overriding explanation for the rise and fall of melanism in moths.
natural selection, cryptic coloration, ecological genetics, insectivorous birds, melanism, lepidoptera
Received November 22, 2011.
Accepted January 13, 2012.
This journal is © 2012 The Royal Society
+++++
FREE FULL PDF AND SUPPLEMENTARY INFO:
http://rsbl.royalsocietypublishing.org/content/early/2012/01/27/rsbl.2011.1136.full.pdf+html
http://rsbl.royalsocietypublishing.org/content/suppl/2012/01/31/rsbl.2011.1136.DC1/rsbl20111136supp1.pdf
http://rsbl.royalsocietypublishing.org/content/suppl/2012/01/31/rsbl.2011.1136.DC1/rsbl20111136supp2.pdf
http://rsbl.royalsocietypublishing.org/content/suppl/2012/01/31/rsbl.2011.1136.DC1/rsbl20111136supp3.pdf