Abstract
Filtering rates of the various growth stages of Calamoecia lucasi were determined in cultures of yeast labelled with 14C, and the effects of food concentrations and temperature on filtering and feeding rates examined. Filtering rates decreased with increasing food concentration, and above a limiting value of 0.8×104 cells·ml-1 feeding rates were maximal and did not increase further. Filtering rates increased with increasing temperature up to 20°C, and from nauplius to adult, although weight specific feeding rates were highest in CII. Assimilation efficiencies of the adults averaged 65%. The effect of temperature on the rate of oxygen consumption of C. lucasi, Boeckella delicata and B. symmetrica was measured using the micro-Winkler technique, and the regression relationship between log oxygen uptake, temperature and log weight calculated for the three species. Using these data a preliminary energy budget was calculated for C. lucasi. The balance between food intake and respiratory output was positive in all stages except the nauplius, and was greatest in CII-IV. This concurs with information from field studies of C. lucasi in which daily P/B ratios were greatest in these stages also.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
