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Both species were then cultured separately at the mentioned conditions, in three experimental regimes: Total 0�C15??m plankton: lake water filtered through 15??m nytal mesh size. Plankton fraction 0�C3??m: http://www.selleck.cn/products/PLX-4720.html females in transparent, glass jars with 15?mL of feeding suspension. Four replicates per treatment were established. Rotifers were then transferred daily to clean jars, each containing 15?mL of fresh food suspensions. The total number of live females and eggs was recorded during the daily transfers. The experiments lasted 15 days (October 19 to November 2). Fresh lake water was collected from the same place on alternate days and filtered immediately to prepare feeding suspensions for this day and the next. Each time, bacteria and phytoplankton biomass, seston organic carbon and chlorophyll a of lake water and feeding suspensions, were quantified. Epifluorescence microscopy was used for bacteria and nanoflagellate enumeration; PAGA fixed samples were stained with DAPI [8] and counted on 0.2 black nuclepore membranes with UV and green light to differentiate heterotrophic from autotrophic organisms. Cell volumes were computed from photomicrographs measurements and were transformed into http://www.selleckchem.com/products/a-1331852.html carbon biomass using the allometric relationship: C?=?0.12?��?V0.72 (where: V?=?volume, ��m3 and C?=?carbon, pg; [9]). Phytoplankton cells, flagellates, and ciliates from water samples that have been fixed in lugols were enumerated by settling http://www.selleckchem.com/products/avelestat-azd9668.html using an inverted microscope at 1000��. Cell volumes were computed from measurements used to approximate regular geometric solids and converted to C-biomass using the general factor 0.12?pg?C??m?3. Chlorophyll a concentrations was measured in a spectrophotometer from acetone�Cdimethyl sufoxide extracts [10] and seston organic carbon (POC) using a Shimadzu TOC-V (CSN) Total organic carbon analyzer (POC was estimated as the difference between TOC of non-filtered and filtered water through Whatman GF/F). Clearance and assimilation rates of A. fissa and B. angularis were measured with 3H-labeled bacteria in two treatments: lake water with all organisms