Section 54
Chapter 53,451

Growth lines in a bivalve mollusk: subdaily patterns and dissolution of the shell

Gordon, J.; Carriker, M.R.

Science 202(4367): 519-521


ISSN/ISBN: 0036-8075
PMID: 17813490
DOI: 10.1126/science.202.4367.519
Accession: 053450538

Download citation:  

Scanning electron micrographs of sections of the prismatic shell of the bivalve Mercenaria mercenaria reveal narrow subdaily growth striations. The width of these narrow lines, formed by concentrations of organic material, corresponds to the quantity of shell material that would be expected to dissolve during periods of anaerobic metabolism. The pH in the extrapallial fluid of the bivalve decreases when the valves are closed, and the amount of dissolution of shell is related to the duration of valve closure.

PDF emailed within 0-6 h: $19.90