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Re: Sibling predation (stringing it all together)
>basis for natural selection is that 'your' genes must survive because
>you are the fittest. The father gains nothing by rubbing out his
>sons but his sons and faugthers benefit by reducing the competion
>(i.e.: their younger siblings and eggs).
Only if the increase in their own reproduction offsets the loss of their
genes in the sibs.
>Kin selection is a response to selective presures other than
>reseource linitations or territory.
Not necessarily. If a kin group can take care of a larger territory per
individual than individuals, kin selection can come into play. However, as
you point out the implies some cooperation.
I think one of the biggest issues here is that the tank is much smaller
than a natural body of water. IIn a tank, all eggs and fry are likely to
be your offspring or your sibs, but in the wild, that's probably not the
case, so eating all fry and eggs encountered as a matter of course probably
means an energy bonus with no inclusive fitness cost.
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