Effect of Saharan dust inputs on bacterial activity and community composition in Mediterranean lakes and reservoirs

Reche, Isabel; Ortega-Retuerta, E.; Romera, Otilia; Villena, Elvira Pulido; Morales‐Baquero, Rafael; Casamayor, Emilio O.

doi:10.4319/lo.2009.54.3.0869

Cited by 119 publications

(133 citation statements)

References 48 publications

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“…Atmospheric depositions are the main source of reactive nitrogen in remote mountain catchments (Catalan et al, 1994), particularly ammonium with concentrations in the rain up to 30fold higher than mean values measured in the lake water . High influence of airborne dust nutrients has also been reported Reche et al, 2009) that may fuel AOA nitrification activity. These results reflect the wide set of ecological and thermal conditions where AOA are distributed, ranging from hot springs (Zhang et al, 2008) to the ice layers reported here.…”

Section: Discussionmentioning

confidence: 99%

Vertical segregation and phylogenetic characterization of ammonia-oxidizing Archaea in a deep oligotrophic lake

et al. 2012

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Freshwater habitats have been identified as one of the largest reservoirs of archaeal genetic diversity, with specific lineages of ammonia-oxidizing archaea (AOA) populations different from soils and seas. The ecology and biology of lacustrine AOA is, however, poorly known. In the present study, vertical changes in archaeal abundance by CARD-FISH, quantitative PCR (qPCR) analyses and identity by clone libraries were correlated with environmental parameters in the deep glacial high-altitude Lake Redon. The lake is located in the central Spanish Pyrenees where atmospheric depositions are the main source of reactive nitrogen. Strong correlations were found between abundance of thaumarchaeotal 16S rRNA gene, archaeal amoA gene and nitrite concentrations, indicating an ammonium oxidation potential by these microorganisms. The bacterial amoA gene was not detected. Three depths with potential ammonia-oxidation activity were unveiled along the vertical gradient, (i) on the top of the lake in winter–spring (that is, the 0 oC slush layers above the ice-covered sheet), (ii) at the thermocline and (iii) the bottom waters in summer—autumn. Overall, up to 90% of the 16S rRNA gene sequences matched Thaumarchaeota, mostly from both the Marine Group (MG) 1.1a (Nitrosoarchaeum-like) and the sister clade SAGMGC−1 (Nitrosotalea-like). Clone-libraries analysis showed the two clades changed their relative abundances with water depth being higher in surface and lower in depth for SAGMGC−1 than for MG 1.1a, reflecting a vertical phylogenetic segregation. Overall, the relative abundance and recurrent appearance of SAGMGC−1 suggests a significant environmental role of this clade in alpine lakes. These results expand the set of ecological and thermal conditions where Thaumarchaeota are distributed, unveiling vertical positioning in the water column as a key factor to understand the ecology of different thaumarchaeotal clades in lacustrine environments.

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Section: Discussionmentioning

confidence: 99%

Vertical segregation and phylogenetic characterization of ammonia-oxidizing Archaea in a deep oligotrophic lake

et al. 2012

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“…In arid regions of the western US and southern Europe, dust emissions can result in substantial nutrient subsidies in the form of Fe, P, and N Lawrence and Neff, 2009;Ballantyne et al, 2011;Reche et al, 2009). Given phosphorus (P) limitation or co-limitation in many alpine areas (Elser et al, 2009;King et al, 2008), dust-derived and other atmospheric P inputs may be especially important.…”

Section: N Mladenov Et Al: Atmospheric Deposition As a Source Of Camentioning

confidence: 99%

Atmospheric deposition as a source of carbon and nutrients to an alpine catchment of the Colorado Rocky Mountains

et al. 2012

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Abstract. Many alpine areas are experiencing deglaciation, biogeochemical changes driven by temperature rise, and changes in atmospheric deposition. There is mounting evidence that the water quality of alpine streams may be related to these changes, including rising atmospheric deposition of carbon (C) and nutrients. Given that barren alpine soils can be severely C limited, atmospheric deposition sources may be an important source of C and nutrients for these environments. We evaluated the magnitude of atmospheric deposition of C and nutrients to an alpine site, the Green Lake 4 catchment in the Colorado Rocky Mountains. Using a long-term dataset (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) of weekly atmospheric wet deposition and snowpack chemistry, we found that volume weighted mean dissolved organic carbon (DOC) concentrations were 1.12 ± 0.19 mg l −1 , and weekly concentrations reached peaks as high at 6-10 mg l −1 every summer. Total dissolved nitrogen concentration also peaked in the summer, whereas total dissolved phosphorus and calcium concentrations were highest in the spring. To investigate potential sources of C in atmospheric deposition, we evaluated the chemical quality of dissolved organic matter (DOM) and relationships between DOM and other solutes in wet deposition. Relationships between DOC concentration, fluorescence, and nitrate and sulfate concentrations suggest that pollutants from nearby urban and agricultural sources and organic aerosols derived from sub-alpine vegetation may influence high summer DOC wet deposition concentrations. Interestingly, high DOC concentrations were also recorded during "dust-in-snow" events in the spring, which may reflect an association of DOM with dust. Detailed chemical and spectroscopic analyses conducted for samples collected in 2010 revealed that the DOM in many late spring and summer samples was less aromatic and polydisperse and of lower molecular weight than that of winter and fall samples. Our C budget estimates for the Green Lake 4 catchment illustrated that wet deposition (9.9 kg C ha −1 yr −1 ) and dry deposition (6.9 kg C ha −1 yr −1 ) were a combined input of approximately 17 kg C ha −1 yr −1 , which could be as high as 24 kg C ha −1 yr −1 in high dust years. This atmospheric C input approached the C input from microbial autotrophic production in barren soils. Atmospheric wet and dry deposition also contributed 4.3 kg N ha −1 yr −1 , 0.15 kg P ha −1 yr −1 , and 2.7 kg Ca 2+ ha −1 yr −1 to this alpine catchment.

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“…Alpert et al, 1998;Chaboureau et al, 2011); radiative budget and climate (e.g. Nabat et al, 2012Nabat et al, , 2015a; precipitation chemistry (Chester et al, 1996;Loÿe-Pilot et al, 1986;Avila and Rodà, 2002); soil formation (Nihlén et al, 1995); and biogeochemistry of forest ecosystems (Avila and Peñuelas, 1999), oligotrophic lakes (Morales-Baquero et al, 2006;Reche et al, 2009), and marine surface waters (Guerzoni et al, 1999;Herut et al, 1999;Guieu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

In situ measurements of desert dust particles above the western Mediterranean Sea with the balloon-borne Light Optical Aerosol Counter/sizer (LOAC) during the ChArMEx campaign of summer 2013

et al. 2018

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Effect of Saharan dust inputs on bacterial activity and community composition in Mediterranean lakes and reservoirs

Cited by 119 publications

References 48 publications

Vertical segregation and phylogenetic characterization of ammonia-oxidizing Archaea in a deep oligotrophic lake

Vertical segregation and phylogenetic characterization of ammonia-oxidizing Archaea in a deep oligotrophic lake

Atmospheric deposition as a source of carbon and nutrients to an alpine catchment of the Colorado Rocky Mountains

In situ measurements of desert dust particles above the western Mediterranean Sea with the balloon-borne Light Optical Aerosol Counter/sizer (LOAC) during the ChArMEx campaign of summer 2013

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