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Extrinsic microbial degradation of the alligator eggshell
Science (New York, N.Y.)
|December 4, 1981
Summary
Nest bacteria degrade alligator eggshells through acidic by-products, increasing porosity and decreasing shell strength during incubation. This bacterial action creates erosion craters on the calcified outer layer.
Area of Science:
- Paleontology
- Microbiology
- Materials Science
Background:
- Alligator eggshells possess a densely calcified outer layer crucial for embryonic development and protection.
- The incubation environment, including microbial activity, can influence eggshell integrity.
Purpose of the Study:
- To investigate the degradation process of alligator eggshells during incubation.
- To identify the agents responsible for eggshell weakening.
- To characterize the structural changes in the eggshell.
Main Methods:
- Microscopic examination of alligator eggshell structure.
- Analysis of bacterial metabolic by-products.
- Assessment of eggshell porosity and strength.
Main Results:
- Progressive crystal dissolution observed in the outer eggshell layer.
- Formation of concentrically stepped erosion craters.
- Acidic metabolic by-products from nest bacteria identified as the cause of dissolution.
- Increased eggshell porosity and decreased shell strength documented.
Conclusions:
- Nest bacteria play a significant role in the extrinsic degradation of alligator eggshells.
- Bacterial-induced dissolution alters eggshell structure, impacting its protective function.
- Understanding this degradation is vital for studying reproductive success and fossilization processes.
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