Nutritional status response of Daphania laevis and Moina micura from a tropical reservoir to different algal diets: Scenedesmus quadricauda and Ankistrodesmus gracilis

Abstract

The accumulation of lipid reserves was investigated in two common cladoceran species typical of neotropical freshwaters. Experiments were performed in order to measure differential accumulation of lipid reserves in response to two algal diets, S. quadricauda and A. gracilis. The larger D. laevis fed with the Ankistrodesmus diet accumulated a higher amount of total lipids. The average lipid content for both diets was 1.1% and 22.1% dry weight for Scenedesmus and Ankistrodemsus, respectively. This difference was found to be highly significant. The superior nutritional quality of A. gracilis was confirmed by the experiments using the smaller Moina micrura. This cladoceran accumulated 11.4% and 19.9% of the average dry weight of lipids from Scenedesmus and Ankistrodesmus, respectively. The study also found that most lipid reserves are concentrated as triacylglycerols in both cladocerans. The relative contribution of this class of lipids also varied according to the diet. For Daphnia, for instance, the average triacylglycerol levels varied from 6.2 to 11.0 with the Scenedesmus and Ankistrodesnus diets, respectively.

Veligers of an introduced bivalve, Limnoperna fortunei, are a new food resource that enhances growth of larval fish in the Paraná River (South America)

“…In general, the biochemical compositions of the food items were consistent with those seen in other crustacean and mollusc studies which have found high protein levels (over 50%) and variable proportions of lipids and carbohydrates (Williams & McMahon, 1989;Sprung, 1993;Riccardi & Mangoni, 1999;Chaparro, Navarrete & Thompson, 2006). Specifically, the cladocerans and copepods in the present study had chemical compositions similar to those recorded previously for similar species from several environments (Vijverberg & Frank, 1976;Riccardi & Mangoni, 1999;Macedo & Pinto-Coelho, 2001). Although lipid contents displayed great variation between prey items, veligers contained up to 3 and 5 times more lipids than that found in cladocerans and copepods, respectively.…”

Growth and development time of subtropical Cladocera Diaphanosoma birgei Korinek, 1981 fed with different microalgal diets

“…Results showed that food quality affected the life history parameters of D. birgei and that dietary constraints could be an important factor in the determination of population success. Macedo and Pinto-Coelho (2001) observed that lipid level of Moina micrura varied between 11.4% and 19.9% due to the feeding effects of different algal diets. Algal diets, rich in fatty acids, generally supported better survival and growth in many cladoceran species (Nandini et al, 2007).…”

Horizontal distribution of Cladocera in a subtropical lake marginal to a river

“…Variation in the abundance of the species above from S1 to S6 and at stations S8, S9 and S17 correlated to water transparency may be affected by fluctuations in the amounts of suspended organic and inorganic matter. Inorganic suspended matter can be harmful to cladocerans, since it may adhere to and obstruct their respiratory and natatory apparatuses (Mourelatos and Lacroix, 1990;Macedo and Pinto-Coelho, 2000). A high organic content in suspended matter is a sign of food richness, shaped by phytoplankton and organic aggregated detritus (Vilar et al, 2014).…”