Diet quality impact on growth, reproduction and digestive activity in Brachionus calyciflorus
نویسندگان
چکیده
We examined population growth rate, reproduction and phosphatase activity in digestive tracts of individual Brachionus calyciflorus fed by P-replete (molar C:P 1⁄4 107) or P-depleted (C:P 1⁄4 920) algal food supplied at three carbon (C) concentrations (1, 2, and 4 mg C L). Rotifer growth rate was significantly influenced by P content, whereas the effect of algal C concentration was not significant. Both algal P content and C concentration had a significant effect on the egg ratio. The individual amount of chlorophyll a (chl-a) was considered as a proxy for the ingested algal food occurring in the rotifer’s gut and phosphatase activity in the gut likely reflected variable individual assimilation of P under different food treatments. The amount of both chl-a and phosphatase activity in the rotifers fed by P-replete algae significantly increased with an increase in C concentration in the food suspension. In contrast, the amount of chl-a significantly decreased with an increase in food concentration, and phosphatase activity did not change significantly over different food quantity in the rotifers fed by P-depleted algae. Thus, the hypothesis that P-deficient rotifers use preabsorptive regulation by changing activity of the digestive enzymes is not supported by the data.
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