Let alone the methodology, is there any solid reference on
evolutionary effects on the adult fenotypes by predators of larvae or
young individuals? That is there are two facts frequently mentioned in
books etc.

a-Death rate during larval stage is high, for most groups
(evolutionary perspective???).
b-Most advances described for predator avoidance or defence refer to
adults and their predators, eg to be acquired after adulthood (in many
examples predatos pf the juveniles tend to be different) (sea snake
mimicry in mimic octopus; eye spots in insects cf poisonous hairs of
the caterpillars, burrowing habit of flat fishes and the like)

In the view of these, I can conclude that the article supports an idea
undocumented so far.

The correct name is C. maenas BTW.


Kota Allen Aigen <[log in to unmask]>

> The New York Times Science section(March 24)has a short note: Hidden
>  in Plain Sight, a Bigger Shell on a Snail Facing a New Predator.
> Jonathon A.D. Fisher, Queens University, Ontario, Peter S.
> Petraitis, University of Pennsylvania et al, in the Proceedings of
> the National Academy of Sciences, reported that Nucella lapillus
> (Atlantic Dogwinkle, an intertidal muricid) on Mount Desert Island,
> Maine, increased in length by about 23% since collections made in
> 1915-1923.  This is reported to be an apparent result of adaptation
> to the introduced crab Carcinus maenus which preys on the smaller
> specimens.  Therer is no indication in the article if there was a
> change in the genetics of the snail or if the variability was part
> of the genotype, waiting for a need to be expressed.
>
> Allen Aigen
> [log in to unmask]
>
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