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Old 18th April 2017, 02:13 PM
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Thumbs up Blind Cave Fish Evolution BMC -FREE

Cartwright, R. A., et al. (2017). "The importance of selection in the evolution of blindness in cavefish." BMC Evolutionary Biology 17(1): 45.
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Blindness has evolved repeatedly in cave-dwelling organisms, and many hypotheses have been proposed to explain this observation, including both accumulation of neutral loss-of-function mutations and adaptation to darkness. Investigating the loss of sight in cave dwellers presents an opportunity to understand the operation of fundamental evolutionary processes, including drift, selection, mutation, and migration.
Background
Blindness has evolved repeatedly in cave-dwelling organisms, and many hypotheses have been proposed to explain this observation, including both accumulation of neutral loss-of-function mutations and adaptation to darkness. Investigating the loss of sight in cave dwellers presents an opportunity to understand the operation of fundamental evolutionary processes, including drift, selection, mutation, and migration.
Results
Here we model the evolution of blindness in caves. This model captures the interaction of three forces: (1) selection favoring alleles causing blindness, (2) immigration of sightedness alleles from a surface population, and (3) mutations creating blindness alleles. We investigated the dynamics of this model and determined selection-strength thresholds that result in blindness evolving in caves despite immigration of sightedness alleles from the surface. We estimate that the selection coefficient for blindness would need to be at least 0.005 (and maybe as high as 0.5) for blindness to evolve in the model cave-organism, Astyanax mexicanus.
Conclusions
Our results indicate that strong selection is required for the evolution of blindness in cave-dwelling organisms, which is consistent with recent work suggesting a high metabolic cost of eye development.
http://dx.doi.org/10.1186/s12862-017-0876-4

https://www.ncbi.nlm.nih.gov/pmc/art...rticle_876.pdf

Phew! Just as well that evolutionary biology has no maffs in it.
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Old 18th April 2017, 06:51 PM
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Default Re: Blind Cave Fish Evolution BMC -FREE

Makes me think of the absolutely top shelf horror movie, The Decent (2005). Anyone seen that?
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Old 18th April 2017, 07:24 PM
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Default Re: Blind Cave Fish Evolution BMC -FREE

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pipbarber said View Post
Makes me think of the absolutely top shelf horror movie, The Decent (2005). Anyone seen that?
I never knew there was a math horror movie. Makes sense!
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Old 18th April 2017, 07:53 PM
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Default Re: Blind Cave Fish Evolution BMC -FREE

Maths would make a great horror movie, for me anyway. That's an interesting idea actually. Hmmm...
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