Nematodes in wastewater biofilms—Appearance and density of species in three biofilter reactors

Bergtold, Matthias; Mayr, Gérald; Traunspurger, Walter

doi:10.1016/j.watres.2006.09.023

Cited by 9 publications

(9 citation statements)

References 29 publications

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“…, Bergtold et al. ). By grazing and breaking through biofilms, meiofauna skim off bacterial mats, a process that helps to maintain good filtration rates for membranes used, e.g., for purifying drinking water (Derlon et al.…”

Section: Density and Functional Diversity Of Biofilm‐dwelling Consumersmentioning

confidence: 98%

“…() reported up to 1,342 metazoans/cm 2 in the biofilm coating the stony littoral of a Swedish lake, and one can find commonly 10–100 small metazoans crowding each square centimeter on a variety of submerged substrates (Vidakovic and Bogut , Bergtold et al. , Norf et al. , Majdi et al.…”

Section: Density and Functional Diversity Of Biofilm‐dwelling Consumersmentioning

confidence: 99%

“…Microscopic metazoans (also called meiofauna) can also show very high densities in biofilms. For example, Schr€ oder et al (2012) reported up to 1,342 metazoans/cm 2 in the biofilm coating the stony littoral of a Swedish lake, and one can find commonly 10-100 small metazoans crowding each square centimeter on a variety of submerged substrates (Vidakovic and Bogut 2006, Bergtold et al 2007, Norf et al 2009b, Majdi et al 2012b). Biofilm-dwelling meiofauna is typically composed of a diverse assemblage of rotifers, nematodes, gastrotrichs, tardigrades, micro-turbellarians, micro-crustaceans, oligochaetes, and early instars of insect larvae (mostly chironomids).…”

Section: Density and Functional Diversity Of Biofilm-dwelling Consumersmentioning

confidence: 99%

“…Meiofauna may engulf bacteria, algae, and protozoans whole, or use jaws or hollow stylets to crack or suck out the inner contents of prey larger than themselves. In addition, November 2018 FOOD WEB PERSPECTIVE ON BIOFILMS 545 oligochaetes, bdelloid rotifers and some nematodes can thrive in organically polluted environments; for instance, they massively colonize biofilms growing on surfaces and filters in wastewater treatment plants (Schreiber et al 1997, Fried et al 2000, Bergtold et al 2007. By grazing and breaking through biofilms, meiofauna skim off bacterial mats, a process that helps to maintain good filtration rates for membranes used, e.g., for purifying drinking water (Derlon et al 2013).…”

Section: Density and Functional Diversity Of Biofilm-dwelling Consumersmentioning

confidence: 99%

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The food web perspective on aquatic biofilms

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Erken

Majdi

et al. 2018

Ecological Monographs

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Biofilms, the complex communities of microbiota that live in association with aquatic interfaces, are considered to be hotspots of microbial life in many aquatic ecosystems. Although the importance of attached algae and bacteria is widely recognized, the role of the highly abundant biofilm‐dwelling micrograzers (i.e., heterotrophic protists and small metazoans) is poorly understood. Studies often highlight the resistance of bacterial biofilms to grazing within the microbial food web and therefore argue that the micrograzers have a modulating role (i.e., have effects on biofilm phenotype) rather than a direct trophic role within biofilms. In the present review, we show that this view comes too short, and we establish a conceptual framework of biofilm food webs consisting of three major elements. (1) Energy pathways and subsidization from plankton. As inhabitants of interfaces, biofilm‐dwelling grazers potentially access both planktonic organisms and surface‐associated organisms. They can play an important role in importing planktonic production into the biofilm food web and thus in the coupling of the planktonic and benthic food webs. Nevertheless, specialized grazers are also able to utilize significant amounts of autochthonous biofilm production. (2) Horizontal complexity of the basal food web. While bacteria and algae within biofilms are edible in general, food quality and accessibility of both bacteria and algae can differ considerably between different prey phenotypes occurring during biofilm formation with respect to morphology, chemical defense, and nutrient stoichiometry. Instead of considering bacteria and algae within biofilms to be generally resistant to feeding by micrograzers, we suggest considering a horizontal food‐quality axis to be at the base of biofilm food webs. This food quality gradient is probably associated with increasing costs for the micrograzers. (3) Vertical food web complexity and food chain length. In addition to the consumption of bacteria and algae, many predatory micrograzers exist within biofilm food webs. With the help of video microscopy, we were able to demonstrate the existence of a complex food web with several trophic levels within biofilms. Our conceptual framework should assist in integrating food web concepts and processes into whole‐biofilm budgets and in understanding food‐web‐related interactions within biofilms.

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Section: Density and Functional Diversity Of Biofilm‐dwelling Consumersmentioning

confidence: 98%

Section: Density and Functional Diversity Of Biofilm‐dwelling Consumersmentioning

confidence: 99%

Section: Density and Functional Diversity Of Biofilm-dwelling Consumersmentioning

confidence: 99%

Section: Density and Functional Diversity Of Biofilm-dwelling Consumersmentioning

confidence: 99%

See 2 more Smart Citations

The food web perspective on aquatic biofilms

Weitere

Erken

Majdi

et al. 2018

Ecological Monographs

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show abstract

“…Over 100 species are found in Lake Obersee, Lake Constance, Lake K ö nigssee and the K ö rsch River, whereas in most lakes and rivers, species richness is between 40 and 80 ( Tab. where the species richness is low (5 -10) but abundance is high (Bergtold et al 2007). Even the profundal (water depth of 60 -190 m) of Lake K ö nigssee is home to approximately 60 nematode species (Traunspurger 1996 a) living without light and at a temperature of 4 ° C throughout the year.…”

Section: Species Richnessmentioning

confidence: 99%