Evaluation of trophic transfer in the microbial food web during sludge degradation based on 13C and 15N natural abundance

Spatial variations of biochemical content and stable isotope ratios of size-fractionated plankton in the Mediterranean Sea (MERITE-HIPPOCAMPE campaign)

“…may lower δ 13 C and δ 15 N values of SPM in the 0.7-2.7 µm size-fraction (Rau et al, 1990;Rolff, 2000;Hunt et al, 2017). These differences in the composition may also suggest predation within the 0.7-60 µm fraction (Onodera et al, 2018;Armengol et al, 2019). However, an increase in δ 15 N values with the size has already been observed in autotrophs (Karsh et al, 2003;Hunt et al, 2017).…”

An ecological application of sustainability and sustainizability over sets

“…Further, the successful operation of biological wastewater treatment processes requires that sustainable population levels be maintained for a multitude of microorganisms, such as bacteria, protozoa, and metazoa. 12 In particular, the levels of various microbial population play an important role in the performance of biological wastewater treatment operations in terms of degradation of influent organic matter, elimination of pathogenic bacteria, maintenance of the microbial communities, and reduction of excess sludge. 12 As aforementioned, ecosystems are complex networks of living organisms, which are interconnected and linked with their environment through a myriad of nutrient cycles, mass, and energy flows.…”

“…12 In particular, the levels of various microbial population play an important role in the performance of biological wastewater treatment operations in terms of degradation of influent organic matter, elimination of pathogenic bacteria, maintenance of the microbial communities, and reduction of excess sludge. 12 As aforementioned, ecosystems are complex networks of living organisms, which are interconnected and linked with their environment through a myriad of nutrient cycles, mass, and energy flows. 13 For quantitative purposes, ecosystems are often described by systems of ordinary differential equations (ODE) whose dynamic behavior is influenced by such terms as net mortality rate (indicating the difference between birthrate and death rate), compartment interactions (e.g., accounting for exchange of biomass between populations through predation and grazing), and functions reflecting various external effects, like seasonal change, meteorological events, pollution buildup, and so forth.…”