Why Were the Shells of Mankind's Earliest Ornament Larger in the Pleistocene Than in the Holocene?
Author Information
Author(s): Teske Peter R., Papadopoulos Isabelle, McQuaid Christopher D., Newman Brent K., Barker Nigel P.
Primary Institution: Rhodes University, South Africa
Hypothesis
The size difference in shells of Nassarius kraussianus is due to either genetic differences or phenotypic plasticity in response to environmental conditions.
Conclusion
The decrease in fossil shell size from Pleistocene to Holocene was likely due to increased temperatures as a result of climate change.
Supporting Evidence
- Fossils of N. kraussianus from the Middle Stone Age were significantly larger than those from the Late Stone Age.
- Genetic analyses revealed two lineages of N. kraussianus, but no genetic basis for size differences was found.
- Extant individuals from cooler waters had larger shells compared to those from warmer regions.
Takeaway
A long time ago, shells used by humans were bigger, and scientists think this is because it got warmer over time.
Methodology
The study involved genetic analyses and morphological measurements of shell sizes from various populations of Nassarius kraussianus.
Potential Biases
Potential biases may arise from the selection of sampling localities and the methods used for measuring shell sizes.
Limitations
The study's conclusions are based on fossil records and current environmental conditions, which may not fully account for historical variations.
Participant Demographics
The study focused on the southern African population of Nassarius kraussianus.
Statistical Information
P-Value
0.003
Confidence Interval
95% C.I. = 0.94–2.72
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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