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Date: | Wed, 15 Dec 2004 18:13:57 -0500 |
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> > I am attempting to locate a specialist who tell me something
> > about what is known about the growth rings of freshwater
> > shells in this case from the Yucatan, Mexico with particular
> > attention to one species, Pomacea flagellata.
Doug Jones, with the Florida Museum of Natural History, has done a lot of mollusk growth studies.
If there is seasonality, the stable isotope ratios (13C/12C, 18O/16O) in the shell should reflect this. Sampling the stable isotopes along the direction of growth should give you a good idea of the number of seasons the animal lived through.
I think that Pomacea is generally annual, though I doubt that all species have been checked. Thus, the shells may represent no more than a year total.
Dr. David Campbell
Old Seashells
University of Alabama
Biodiversity & Systematics
Dept. Biological Sciences
Box 870345
Tuscaloosa, AL 35487-0345 USA
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That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa
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