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JOURNAL OF PLANKTON RESEARCH | VOLUME 5 | NUMBER 2 | PAGES 279-288 | 1983
© Oxford University Press

research-article

In situ measurement of filtering rates of the salp, Thalia democratica, on phytoplankton and bacteria

Michael M. Mullin1

Australian Institute of Marine Science PMB No. 3, Townsville MSO, Queensland 4810, Australia

Received on July 1, 1982; accepted on November 1, 1982

Salps were gently captured in a perspex chamber by a SCUBA diver, who then injected a suspension of 14C-labeled phytoplankton and 3H-labeled bacteria into the chamber. After 0.5 h incubation in situ, filtering rates were estimated from incorporation of the two isotopes, and expressed as a function of each salp's size. Both bacteria and phytoplankton were grazed by Thalia, the latter at higher rates. Weight-specific grazing rates increased with increasing size of salp. Estimated hourly rations ranged from 1% of bodily C for small Thalia feeding only on phytoplankton to 8% of bodily C for large Thalia feeding on all particulate organic C. The method gave repeatable results for Thalia, but was unsatisfactory for the pteropod, Cavolinia.

1Present address: Institute of Marine Resources, A-018, University of California, San Diego, Scripps Institution of Oceanography, La Jolla, CA 92093, USA.


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