Gary,
Guido's intent for his series is to provide a guide to the marine mollusks
of the Philippines. He obviously meant a two week "shelling vacation".
It is a little disturbing to find that many of the species that we consider
common due to availability in shell shops are very difficult to find in the
wild. It's his book. At least he defines how it is applied.
When Ed and I redo the Olive book, we will use different criteria, or we may
only mention those species that are extremely rare in collections.
Thanks for your comment.
Dennis Sargent
-----Original Message-----
From: Conchologists List [mailto:[log in to unmask]] On Behalf Of GARY
FREDRICKSON
Sent: Sunday, October 19, 2008 4:33 PM
To: [log in to unmask]
Subject: Re: [CONCH-L] RARE, UNCOMMON, COMMON
I don't know, why am I not comfortable with the two week vacationer test?
Gary
--- On Wed, 10/15/08, Dennis sargent <[log in to unmask]> wrote:
> From: Dennis sargent <[log in to unmask]>
> Subject: [CONCH-L] RARE, UNCOMMON, COMMON
> To: [log in to unmask]
> Date: Wednesday, October 15, 2008, 5:22 PM
> Hello everyone, my name is Dennis Sargent and this is my
> first post on
> CONCH-L.
>
> I was very much involved with mollusks in the days before
> computers and I am
> pleased to return to my interest and find this great
> resource.
>
>
>
> Ed Petuch and I just recently finished editing the section
> on the genus
> Oliva for Guido Poppe's "Philippine Marine
> Mollusks, Volume 2".
>
> That series does list the relative rarity of the pictured
> species. When I
> first reviewed the material, I noted several species that
> were listed as
> rare that can be found by the hundreds in shell shop bins.
> I questioned
> Guido concerning the rating and he replied, "The
> rating in this series of
> books is based upon someone coming to the Philippines for a
> two week
> vacation and the likelihood that they will find a live
> specimen of that
> species on their trip". He added further, "The
> shells in the bins may
> represent a fisherman's annual take of that species, as
> for many of them,
> the shells are a sideline to supplement their commercial
> fishing activity."
>
>
>
> This made me realize that each author may be looking at the
> issue of
> relative abundance from a different viewpoint. From now on,
> I will try to
> establish the criteria for relative rarity whenever I use
> that measure.
>
>
>
> Best wishes,
>
>
>
> Dennis M. Sargent
>
> [log in to unmask]
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