Anthropogenic disturbances influencing ciliate functional feeding groups in impacted tropical streams

Segóvia, Bianca Trevizan; Lansac‐Tôha, Fernando Miranda; Meira, Bianca Ramos; Cabral, Adalgisa Fernanda; Velho, Luiz Felipe Machado

doi:10.1007/s11356-016-7185-0

Cited by 17 publications

(15 citation statements)

References 63 publications

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“…This information can be invaluable in diagnosing sources of pollution and in developing mitigation approaches at the watershed level (Wilkes et al, 2013a , 2014 ). Examining the functionality of the bacterial community can also serve as an indicator for stream health and stress (Segovia et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Aquatic Bacterial Communities Associated With Land Use and Environmental Factors in Agricultural Landscapes Using a Metabarcoding Approach

et al. 2018

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This study applied a 16S rRNA gene metabarcoding approach to characterize bacterial community compositional and functional attributes for surface water samples collected within, primarily, agriculturally dominated watersheds in Ontario and Québec, Canada. Compositional heterogeneity was best explained by stream order, season, and watercourse discharge. Generally, community diversity was higher at agriculturally dominated lower order streams, compared to larger stream order systems such as small to large rivers. However, during times of lower relative water flow and cumulative 2-day rainfall, modestly higher relative diversity was found in the larger watercourses. Bacterial community assemblages were more sensitive to environmental/land use changes in the smaller watercourses, relative to small-to-large river systems, where the proximity of the sampled water column to bacteria reservoirs in the sediments and adjacent terrestrial environment was greater. Stream discharge was the environmental variable most significantly correlated (all positive) with bacterial functional groups, such as C/N cycling and plant pathogens. Comparison of the community structural similarity via network analyses helped to discriminate sources of bacteria in freshwater derived from, for example, wastewater treatment plant effluent and intensity and type of agricultural land uses (e.g., intensive swine production vs. dairy dominated cash/livestock cropping systems). When using metabarcoding approaches, bacterial community composition and coexisting pattern rather than individual taxonomic lineages, were better indicators of environmental/land use conditions (e.g., upstream land use) and bacterial sources in watershed settings. Overall, monitoring changes and differences in aquatic microbial communities at regional and local watershed scales has promise for enhancing environmental footprinting and for better understanding nutrient cycling and ecological function of aquatic systems impacted by a multitude of stressors and land uses.

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Section: Discussionmentioning

confidence: 99%

Aquatic Bacterial Communities Associated With Land Use and Environmental Factors in Agricultural Landscapes Using a Metabarcoding Approach

et al. 2018

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“…However, regardless of the hydrological period or data type (incidence and abundance), we found that bacterial and flagellate protist densities showed weak relationships with the other biological groups. Although flagellates and ciliates are considered the main grazers of bacteria (e.g., Segovia et al 2016), evidence for clear relationships between protists and bacteria are frequently absent in ecological studies (Comte et al 2006). One explanation is the use of alternative food resources such as picophytoplankton (Sarmento 2012), mainly in the tropics where heterotrophic bacteria favor the conversion of inorganic carbon into CO 2 rather than fixing the carbon that would be available for higher trophic levels (Amado and Roland 2017).…”

Section: Discussionmentioning

confidence: 99%

“…In this sense, a control of cladocerans and copepods led by fish could positively influence protists as a result of lower predation pressure (Jeppesen et al 1998;Attayde and Hansson 2001). Thus, an increase in the abundance of these protists could affect bacterial abundance negatively (Segovia et al 2016). However, despite zooplankton affect their prey, especially ciliates, those effects rarely translates into remarkable shifts in the basis of the microbial food web (Zollner et al 2003).…”

Section: Minimized Role Of Microbial Loop (Bacteria and Flagellates)mentioning

confidence: 99%

The commonality of core biological groups across freshwater food webs

Lansac‐Tôha

Quirino

Souza

et al. 2021

Limnology & Oceanography

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Assessing how organisms interact is fundamental to understand biodiversity patterns. Like many ecosystems, most freshwater environments are susceptible to spatial and temporal variations, especially floodplains. In spite of the expected variability, the structure of interactions in food webs is a paramount aspect to uncover processes related to ecosystem functioning. Here, we surveyed four large floodplains to identify the biological groups that are protagonists across different freshwater food webs. We used limnological data on physical and biochemical variables, combined with biological information on 10 communities grouped into 41 trait‐based categories. Despite the expected differences among floodplains and between hydrologic periods (dry and flood), we identified that complex freshwater food webs shared core network compartments. Using the eigenvector centrality as a measure of importance to the whole food web, we found that both primary producers (i.e., phytoplankton) and potential top predators (i.e., fish) were the core groups in freshwater trophic networks. These biological groups were consistently among the most linked compartments in all reconstructed food webs. Considering variations among food webs, we found that most differences were dictated by how compartments interact, rather than by their co‐occurrences. Perhaps equally important is that omnivory was important for the reconstructed food webs, drawing attention to this interaction type as a fundamental aspect to unveil ecosystem processes. Although more empirical research is required to fully understand the importance of biotic interactions in freshwater food webs, our findings underline that ecosystems are more likely to collapse when disturbances affect the boundaries of the energy paths.

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“…The bacterivorous ciliates, Parauronema virginianum, strongly dominate sites highly polluted with hydrocarbons and are replaced by Pseudocohnilembus and Euplotes later [115]. Additionally, organic contamination and heavy metals increase the abundance of bacterivorous ciliates in water and sediments [116].…”

Section: Perturbations and Food Websmentioning

confidence: 99%

Food Webs

Mondragón-Camarillo¹,

Rodrı́guez-Zaragoza²

2022

Plankton Communities

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Ciliates are important elements of the trophic networks of aquatic and terrestrial environments, they can be primary producers (myxotrophs), consumers of bacteria, algae, flagellates, even other ciliates and can serve as food for metazoans, for all the above they are the link between different levels of food webs. The structure of the ciliates varies according to the seasons of the year and depending on the trophic conditions of the aquatic systems. Ciliated communities have modifications and adaptations in response to environmental perturbations. The objective of this chapter is to describe the importance of different trophic groups of ciliates in different ecosystems, including anthropogenic perturbations and their impact on trophic webs.

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Anthropogenic disturbances influencing ciliate functional feeding groups in impacted tropical streams

Cited by 17 publications

References 63 publications

Aquatic Bacterial Communities Associated With Land Use and Environmental Factors in Agricultural Landscapes Using a Metabarcoding Approach

Aquatic Bacterial Communities Associated With Land Use and Environmental Factors in Agricultural Landscapes Using a Metabarcoding Approach

The commonality of core biological groups across freshwater food webs

Food Webs

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