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Re: Sibling predation (stringing it all together)
Why is everyone in this thread discussing as though
the fish were reasoning individuals and personally
concerned over their sibs/offspring survival etc??
Fish actions are determined by much different factors
then individual thoughts of posterity or the lack
theroff.
Good grief, most humans dont go through what some of
you are attributing to fish.
Try looking at territory,& available meals, for
starters and go from there.
FWIW, probably nothing, my msc is in fisheries, 1976.
jake
--- Doug Karpa-Wilson <dkarpawi at indiana_edu> wrote:
> >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.
>
> Doug
>
>
> Doug Karpa-Wilson
> 1821 S. Maxwell St.
> Bloomington, IN 47401
>
>
> ---------------
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