Subject: | |
From: | |
Reply To: | |
Date: | Fri, 13 Jan 2006 14:08:21 -0500 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
>>> shells are cyclical, so you get lots of one species one year and none the next sometimes
>> OK, Peggy, I'd like to hear more about this "cyclical" business. Is this a generalization, or might some shells only breed every other year? -- Kay Peterson
> It's a generalization, based on field experience. For instance, I was shelling this morning on a flat that usually has lots of
Busycon sinistrum (and the clams on which they feed) and Triplofusus
giganteus; today there were very few. I don't know if it's
because of the extended red tide we've had, the warm winter, or a
general cycle.
* the question was, I think, whether these variations in abundance are
due to a cycle with a regular intervals between peaks of abundance and
scarcity, or just irregular fluctuations?
fred.
------------------------------------------------------------
Bishops Mills Natural History Centre
Frederick W. Schueler, Aleta Karstad, Jennifer Helene Schueler
RR#2 Bishops Mills, Ontario, Canada K0G 1T0
on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
(613)258-3107 <[log in to unmask]> http://pinicola.ca
------------------------------------------------------------
----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------
|
|
|