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I have traditionally thought of and heard about life-history traits (e.g., size at first reproduction, number of offspring, size of offspring, survival, etc., etc.) as drawing from a finite pool of resources that an organism has, and therefore exhibiting tradeoffs. So, for instance, an organism that invests in a lot of offspring would experience a decreased probability of survival.

It has recently come to my attention that this is not always the case, and I'm not sure why. I have been directed to the work of David Houle, who wrote extensively on the topic of life-history traits, but some of his work is inaccessible to me intellectually. I was hoping that somebody had a more digestible explanation or was maybe more familiar with Houle's work.

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Could you link to a few works in particular, or where you first read that? –  Amory Sep 15 '13 at 21:50
    
The name of the paper I've read is, "Genetic covariance of fitness correlates: what genetic correlations are made of and why it matters". David Houle from the journal Evolution, 1991, Vol. 45. Issue 3. Pp 630-648. –  Atticus29 Sep 15 '13 at 22:09
    
It apparently has something to do with the number of loci influencing ability to obtain resources versus the number of loci influencing how those resources are allocated... –  Atticus29 Sep 24 '13 at 21:18
    
For those willing to answer: Here is David Houle's article –  Remi.b Mar 6 at 9:12
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