Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Nitrogenous excretion of selected polychaetes
Student Author(s): Whitmore, J. M.
Blodgett, B. F.
Faculty Advisor(s): Phillips, John
Pages: 19
Location: Final Papers Biology 175H
Date: June 1976
Keywords: polychaeta
Abstract: 1. In Dorvillea moniloceras and Halosydna brevisetosa ammonia comprises more than 80% of the nitrogenous excretion product. In Nerinides acuta, ammonia comprises only approximately 50% of the nitrogenous excretion product. 2. Excretion rates in these polychates are variable both within and among species, but generally tend to be between 3 and 8 ug/ml worm/hr. 3. In D. moniloceras ammonia excretion rate was found to decrease as ambient ammonia concentration increased, with some lessening of the effect with longer periods of exposure to high ambient ammonia concentration. 4. In D. moniloceras, worms exposed to high ambient ammonia concentrations and then placed in pure Instant Ocean excreted ammonia at much higher than normal rates. 5. In D. monilorceras, it was found that the worms' internal body ammonia concentrations increased in high ambient ammonia concentrations and with longer times of exposure to these concentrations.