ISSN:
1573-5117
Keywords:
tropical zooplankton
;
Copepoda
;
feeding
;
experiments
;
filtration rate
;
assimilation rate
;
14C
;
algal culture
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The aim of this work was to study the feeding process of Argyrodiaptomus furcatus (Copepoda-Calanoida) in the Lobo Reservoir (São Carlos, SP, Brazil). Non-ovigerous adult females and the 14C technique were used to measure filtration and assimilation rates. The diet contained the following phytoplankton species: Chlamydomonas sp., Ankistrodesmus gracilis, Melosira italica, Scenedesmus quadricauda and Chlorella zoofingensis. The experiments were carried out using unialgal and mixed cultures during 2-, 4- and 6-h periods. The results of the filtration and assimilation rates were compared. The data obtained by statistical tests showed the highest assimilation rate in Argyrodiaptomus furcatus fed Chlamydomonas sp. in both culture types. However, Chlorella zoofingensis and Scenedesmus quadricauda were the most filtered species in unialgal and mixed cultures, respectively. A higher filtration rate was observed for the 2-h period than for the 4- and 6-h periods. Culture agent was also important. Higher assimilation and filtration rates were obtained during the log phase of Chlamydomonas sp. growth than during the stationary phase.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00026591
