Bacterial grazing by mixotrophic flagellates and Daphnia longispina: a comparison in a fishless alpine lake

Presence, abundance and bacterivory of the mixotrophic algae Pseudopedinella (Dictyochophyceae) in freshwater environments

“…The available values of CR (Nygaard & Tobiesen 1993, Havskum & Riemann 1996, the present study) range between 0.9 and 6.2 nl cell -1 h -1 . These rates of bacterivory are comparable to those observed for highly bacterivorous chrysophytes, like Dinobryon (see review by Unrein et al 2010) and Ochromonas (Sanders et al 1990, Epstein & Shiaris 1992, Callieri et al 2006, and for HF of similar cell size (Laybourn-Parry & Marshall 2003, Jezbera et al 2005, Pirlot et al 2007. Another indication of the relative importance of hetero trophic nutrition in Pseudopedinella spp.…”

“…KEY WORDS: Pseudopedinella · Bacterivory · Grazing rate · Patagonian lakes · Antarctic lakes OPEN PEN ACCESS CCESS Callieri et al 2006, Carvalho & Granéli 2010, Jeong et al 2010, Maruyama & Kim 2013, McKie-Krisberg et al 2015. Several studies have attempted to classify mixotrophs into categories based on the relative importance of their phagotrophic and phototrophic activities (Jones 1994, 2000, Stoecker 1998).…”

Co-selection of antibiotic and heavy metal resistance in freshwater bacteria

“…2) with higher concentrations detected within the first 20 cm . The microbiology of the lake remains a black-box, particularly compared to well characterized microbial communities of other alpine (Callieri et al, 2006) and subalpine lakes in the area (Callieri et al, 2007(Callieri et al, , 2012Bertoni et al, 2010).…”

Interspecific interactions drive chitin and cellulose degradation by aquatic microorganisms

“…The concomitant direct and indirect effects of grazing on bacterial communities have been observed in large temperate lakes , in high mountains lakes (Callieri et al 2006), and tested in laboratory-based experimental systems (Corno & Jürgens 2008). Indeed, even without protozoan grazing of bacteria, energy transfer and OM cycling will depend on interspecific interactions (Jiao et al 2010(Jiao et al , N obu et al 2015.…”

“…In order to raise the number of potential interactions, we tested for the effect of a protist (Poterioochromonas, known to graze bacterial cells under a wide range of conditions; Callieri et al 2006, Corno 2006, Blom & Pernthaler 2010), on bacterial community composition and degradation of biopolymers (chitin and cellulose). We also tested community-level responses to the introduction of an additional bacterial species that we expected to be competitively dominant under these conditions: Burkholderia, common in conditions with abundant polymeric OM (Hutalle-Schmelzer et al 2010) and potentially able to express chitino- (Kong et al 2001) and cellulolytic activity (Liang et al 2014).…”