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Mussel periostracum protects against shell dissolution.

Alisha M Saley1, Aaron T Ninokawa2, Abigail Doan3

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Summary
This summary is machine-generated.

The periostracum, a shell layer in mussels, significantly reduces shell dissolution in corrosive ocean conditions. Increased periostracum cover protects marine calcifiers from ocean acidification effects.

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Area of Science:

  • Marine biology
  • Oceanography
  • Biomineralization

Background:

  • Seawater pH reduction poses a threat to the shell integrity of marine calcifying organisms.
  • The periostracum, an external organic layer in molluscs, may offer protection against shell dissolution in corrosive conditions.

Purpose of the Study:

  • To test the hypothesis that the periostracum protects mussel shells from dissolution under reduced pH.
  • To investigate the influence of periostracum cover and surface texture on shell dissolution rates.
  • To assess field-based periostracum cover in different intertidal habitats.

Main Methods:

  • Quantified shell dissolution rates of Mytilus californianus across pH levels (7.7, 7.5, 7.4).
  • Assessed shell dissolution as a function of periostracum cover and induced surface texture.
  • Measured periostracum cover in various intertidal zones.

Main Results:

  • Shell dissolution decreased threefold with increased periostracum cover (10% to 85%).
  • Lower pH and rougher shell surfaces (post-periostracum removal) led to higher dissolution rates.
  • Periostracum loss was greater in higher, sunnier intertidal locations.

Conclusions:

  • The periostracum provides significant protection against shell dissolution in mussels.
  • Environmental factors like pH and surface texture influence shell vulnerability.
  • Marine organisms' protective structures are crucial for adapting to global environmental changes.