The train has left the station. The entire fable was in our Jacksonville
Sunday paper in the category "Uniquely Florida!"
Harry
On 3/5/2023 3:30 PM, Frederick W. Schueler wrote:
> * 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
>> Department of Natural Sciences
>> 110 S Main St, #7270
>> Gardner-Webb University
>> Boiling Springs NC 28017
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