* is someone going to go to the media outlet that first whooped this
pseudo-ancient clam, with the conchological aspects that have been
raised here?
fred.
==================================================
On 05-Mar-23 11:12 a.m., G Herbert wrote:
> Nearly every mollusk shell in your collection probably has hundreds of
> tiny incremental growth lines. Those can be formed tidally or daily.
> That's not that interesting. What is slightly more interesting Is that
> if you look at the photos closely, there are about 11 larger groups of
> growth lines. Each group is separated by a little ledge which indicates
> a period of growth stoppage where the animal ceased extensional growth
> but continued thickening. There's also color changes at the same point.
> This clam was about 11 years old.
>
> On Saturday, March 4, 2023, David Campbell <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Although in certain cases, particular growth lines in bivalves do
> correlate with years, there is significant variation species to
> species - it needs to be verified for each taxon. One of the
> commonest approaches is to analyze variations in the ratio of
> oxygen-18 to oxygen-16, which correlate to the water temperature.
>
> I expect that Harry is correct in thinking that they counted
> commarginal lamellae, mistakenly thinking that those are annual.
> Off the top of my head, I think that actual lifespans for M.
> campechensis are more like 20-30 years for an old one.
>
> On Sat, Mar 4, 2023 at 5:07 PM Harry Lee <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> As others have commented, there appears to be a conflation of
> methodologies, maybe taxa, involved in this bit of publicity.
>
> The fact that the topical specimen was released after its age
> was estimated is inconsistent with the methodology of Dr. Doug
> Jones [see
> <https://listserv.uga.edu/scripts/wa-UGA.exe?A2=ind2208C&L=CONCH-L&P=R1232&X=OB610375F715AAC39AA&Y=hglee2%40mindspring.com> <https://listserv.uga.edu/scripts/wa-UGA.exe?A2=ind2208C&L=CONCH-L&P=R1232&X=OB610375F715AAC39AA&Y=hglee2%40mindspring.com>] and his successors, which requires sacrifice of the animal.
>
> I have a feeling that a count of the commarginal lamellae (shell
> exterior) was employed as an illegitimate surrogate of the
> rigorous procedure of repeated and careful longitudinal slicing
> of the shell.
>
> Most listers who know the Carolinian /Mercenaria campechiensis/
> well will certainly surmise that this is the identity of the
> topical clam and will realize that the number of commarginal
> lamellae far exceed the age of this species - most easily
> appreciated in juvenile shells.
>
> The Gulf Specimen Marine Lab is another familiar part of the
> seascape here in FL, and the legendary Jack Rudloe is central to
> the institutional culture.
>
> Harry
>
>
> On 3/4/2023 7:58 AM, Marcelo Vanin wrote:
>> I am curious to know the group’s thoughts about this shell find and article:
>>
>> A man in Florida was walking with his family on a beach when he found an abnormally large clam. It turns out, it was not only big, but extremely old – and dates back to 1809.
>>
>> Gulf Specimen Marine Lab, a research lab and aquarium, said Blaine Parker was on Alligator Point, a Florida beach on the Gulf of Mexico, when he found the quahog clam.
>>
>> Most of these clams are 2.8 to 4.3 inches, according to the lab, but Parker's was six inches and 2.6 pounds.
>>
>> Full article here:
>> https://www.cbsnews.com/news/giant-clam-florida-214-years-old-alligator-point-gulf-of-mexico-abraham-lincoln/ <https://www.cbsnews.com/news/giant-clam-florida-214-years-old-alligator-point-gulf-of-mexico-abraham-lincoln/>
>>
>> Happy shelling,
>>
>> Marcelo Vanin
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> Dr. David Campbell
> Associate Professor, Geology
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> 110 S Main St, #7270
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> Boiling Springs NC 28017
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