Effects of anthropogenic inputs on the organic quality of urbanized streams

Impacts of Anthropogenic Changes on the Mun River Water: Insight from Spatio-Distributions and Relationship of C and N Species in Northeast Thailand

“…Though biological mechanisms such as phytoplankton exudation and bacteria production are considered to be important sources of riverine DOC [45], based on regional analyses [1,20,46] it is hard to attribute such high concentrations to the biological effects, because apart from the soil-leaching processes from wetlands (peatlands) and anthropogenic inputs, riverine DOC concentrations seldom exceed 15 mg/L [26,47,48]. Since no other natural DOC sources could be addressed, the extremely high contents of DOC in the Mun River should be closely associated with anthropogenic inputs.…”

“…Previous studies [23,24,25] highlighted that both carbon and nitrogen fluxes have been substantially increasing over past decades as a response to the environment and climate change. Human activity plays an important role in this process [26,27]. On the one hand, anthropogenic inputs such as domestic sewage, industrial effluents, fertilizers, and irrigation can directly increase the concentrations of riverine carbon and nitrogen [28,29].…”

Altitudinal pattern of stream periphyton biomass in tributaries of the Lancang–Mekong River: An indicator of anthropogenic impact?

“…As the main primary producer in streams, periphyton is sensitive to a broad range of stressors and strongly correlated with environmental conditions (Wu et al, 2010a), including land-use (Quinn et al, 1997;Carr et al, 2005), hydrological regimes (Clausen and Biggs, 1997;Uehlinger et al, 2003), in-stream nutrients (Rosemond et al, 1993;Tang et al, 2002) and pollution (Hill et al, 2010). Many studies have demonstrated that periphyton can be an indicator to monitor anthropogenic impact on stream ecosystem (Napolitano et al, 1994;Lewis et al, 2001;Sonneman et al, 2001;Notestein et al, 2003;Bowes et al, 2007;Kalscheur et al, 2012).…”

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“…Nos ecossistemas aquáticos, a heterogeneidade da qualidade da água pode ser influenciada principalmente pela contribuição natural da bacia hidrográfica (conhecidas como background, concentrações naturais afetadas pelas características geológicas e pedológicas do local) e pela magnitude dos impactos antrópicos como o consumo de água, lançamento de efluentes domésticos e industriais, escoamento superficial de áreas urbanas e rurais. Do ponto de vista temporal, as oscilações de qualidade da água podem refletir as formas de uso e ocupação do solo (Kalscheur et al, 2012;Cunha et al, 2013).…”