Minimum Desirable Product http://j.mp/7436Fc Rings true for consumer centered internet startups

sandygautam: Minimum Desirable Product http://j.mp/7436Fc Rings true for consumer centered internet startups

See original: Twitter Minimum Desirable Product http://j.mp/7436Fc Rings true for consumer centered internet startups

Got my first notification. Thanks, Jean-Claude. re: http://ff.im/cs7Gf

EvoMRI: Got my first notification. Thanks, Jean-Claude. re: http://ff.im/cs7Gf

See original: Twitter Got my first notification. Thanks, Jean-Claude. re: http://ff.im/cs7Gf

Liked "Using Wikipedia « A GFU Librarian's Blog" http://ff.im/cAduN

EvoMRI: Liked "Using Wikipedia « A GFU Librarian's Blog" http://ff.im/cAduN

See original: Twitter Liked "Using Wikipedia « A GFU Librarian's Blog" http://ff.im/cAduN

Re: Using Wikipedia http://ff.im/cBs6U

EvoMRI: Re: Using Wikipedia http://ff.im/cBs6U

See original: Twitter Re: Using Wikipedia http://ff.im/cBs6U

Or, in context:... re: http://ff.im/cBpdq

EvoMRI: Or, in context:... re: http://ff.im/cBpdq

See original: Twitter Or, in context:... re: http://ff.im/cBpdq

ICT, transaction cost and development: The flip side

Prof. Pradoshnath from NISTADS was at CIS, Bangalore on Nov 25th, 2009 and gave a presentation on ICT, transaction cost and development: The flip side. His bio and the abstract of the talk are given in this blog.

See original: Home Page ICT, transaction cost and development: The flip side

When two baboon troops go to war

An epic battle between hundreds of Hamadryas baboons is caught on camera by a BBC natural history film crew.

See original: Earth | Earth News When two baboon troops go to war

The downside of beauty [Gene Expression]

250px-Triumph_of_Achilles_in_Corfu_Achilleion.jpgWell, I don't quite know about that, but that's the sort of take-away from a new paper in PLoS Biology which looks at the downsides of female attractiveness. A Cost of Sexual Attractiveness to High-Fitness Females:

Adaptive mate choice by females is an important component of sexual selection in many species. The evolutionary consequences of male mate preferences, however, have received relatively little study, especially in the context of sexual conflict, where males often harm their mates. Here, we describe a new and counterintuitive cost of sexual selection in species with both male mate preference and sexual conflict via antagonistic male persistence: male mate choice for high-fecundity females leads to a diminished rate of adaptive evolution by reducing the advantage to females of expressing beneficial genetic variation. We then use a Drosophila melanogaster model system to experimentally test the key prediction of this theoretical cost: that antagonistic male persistence is directed toward, and harms, intrinsically higher-fitness females more than it does intrinsically lower-fitness females. This asymmetry in male persistence causes the tails of the population's fitness distribution to regress towards the mean, thereby reducing the efficacy of natural selection. We conclude that adaptive male mate choice can lead to an important, yet unappreciated, cost of sex and sexual selection.

The dynamic is well illustrated by the first figure:

journal.pbio.1000254.g001.png

The two lines above the shaded distribution illustrate variant male preference strategies. The solid lines shows random preference for females as a function of size, while the dashed line shows biased preference toward larger fitter females. The two lines below show the distribution of female fitness in response. In the case of the solid line you see the fitness of females in the context of random preferences; that is, males do not strongly prefer females who are fecund because of their large size. The reason that a large female may be more fecund is rather obvious, more physiological resources expendable upon the offspring. The evolutionary anthropologist Sarah Blaffer Hrdy claims the same principle is operative among humans in her book Mother Nature, larger females are less likely to miscarry and have complications, and can provide more robustly for their young. If one is healthy enough to construct a large and robust physique, one normally does so.

And yet as you can see above, strong male preference for these fecund females reduces their fitness. Male persistence from what I can tell might be colloquially termed "harassment." The energetic surfeit which larger females might allocate to their own reproductive output for provisioning has to be expended upon fending off males. In a context where males strongly prefer large females their fitness advantage is actually mitigated! This is a really weird outcome of sexual preferences.

The model rests on four primary assumptions:

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Also check out the featured ScienceBlog of the week: Neurotopia

See original: ScienceBlogs Select The downside of beauty [Gene Expression]

Journal of Happiness Studies - made my day. http://ff.im/cBjV0

EvoMRI: Journal of Happiness Studies - made my day. http://ff.im/cBjV0

See original: Twitter Journal of Happiness Studies - made my day. http://ff.im/cBjV0

Climate change report calls for passenger tax on flights to reduce CO2

8/12/2009 Gatwick would still operate with just one runway.Heavy taxes on passengers and a ban on expansion at regional airports will be needed to curb Britain’s insatiable appetite for air travel, a climate change report will say today .  But it will still be possible to build a third runway at Heathrow, add second runways [...]

See original: Resources for a sustainable future Climate change report calls for passenger tax on flights to reduce CO2