Algological and bacteriological investigations on reed periphyton in Lake Velencei, Hungary

Ács, Éva; Borsodi, Andrea K.; Makk, Judit; Molnár, Piroska; Mózes, Andrea; Rusznyák, Anna; Reskóné, Mária N.; Kiss, Keve Tihamér

doi:10.1023/b:hydr.0000008591.89558.75

Cited by 35 publications

(13 citation statements)

References 19 publications

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“…The most similar are the species-rich communities of slightly mineralized lakes, as well as the species-poor communities of highly mineralized lakes (ÁCS et al 2003). These regularities indicate that, other conditions remaining the same, salinity is the main depressing factor of algal diversity irrespective of the type and distribution of the water body.…”

Section: Discussionmentioning

confidence: 84%

“…Algal habitats are characterized by a high amplitude salinity variation that in large lakes suppresses algal diversity (HAMMER 1986). For example lower bacterial diversity (RUSZNYÁK et al 2008) and algal species richness (ÁCS et al 2003) were found in the open water area of Lake Velencei (where the conductivity is about 2.5-3.5 mS cm -1 averagely) than in the bog-like area of the lake (where the conductivity is about 1.5-2.3 mS cm -1 on average). Many algal species are indicators of environmental conditions reflecting the influence of ACTA BOT.…”

Section: Introductionmentioning

confidence: 94%

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Ecological assessment of wetland ecosystems of northern Kazakhstan on the basis of hydrochemistry and algal biodiversity

Barınova¹,

Nevo²,

Bragina³

2011

Acta Botanica Croatica

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-We studied diversity of algae and cyanobacteria in the wetlands of protected natural lakes with salinity ranging from 0.19 up to 32.7 in the arid/semiarid regions of Northern Kazakhstan. In plankton and periphyton of 34 lakes, we found 254 species belonging to 113 genera of 8 algal divisions. The diversity in arid regions is represented by widespread species of diatoms, green algae, and cyanobacteria in similar proportions. Alkaliphiles, among the indicators of acidification, and betamesosaprobionts, among the indicators of saprobity, predominated. The indices of saprobity in lakes varied from 1.47 to 2.7, reflecting low-trophic and low anthropogenically disturbed wetlands. Oligohalobes--indifferents are most common. Highly diverse algal communities were found irrespective of various levels of mineralization. As a consequence of aridization, salinity increase suppressed algal diversity. The mineralization was the most important variable defining the diversity levels, irrespective of the type and location of wetland lakes in the arid regions.

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Section: Discussionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 94%

Ecological assessment of wetland ecosystems of northern Kazakhstan on the basis of hydrochemistry and algal biodiversity

Barınova¹,

Nevo²,

Bragina³

2011

Acta Botanica Croatica

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“…Although Betaproteobacteria have often been detected in fresh-water lakes (11,12,34), other studies concerning Lake Biwa have also detected many bacteria belonging to Alphaproteobacteria throughout the seasons (27). On the other hand, bacteria belonging to Firmicutes, Betaproteobacteria, and Gammaproteobacteria; Bacillus, Paenibacillus, Janthinobacterium, and Pantoea, were detected in the biofilm samples as well as other biofilms sampled from estuarine lakes and rivers (1,5).…”

Section: Changes Of Bacterial Community Structures In Biofilms and Lamentioning

confidence: 82%

“…Several studies, although based on a short period (one year at most) of observation, have reported that the bacterial community structure in natural biofilms changes seasonally and that the change of the environment surrounding biofilms influenced the community structure of biofilms (1,2,5). However, as far as we know, there have been no studies on the seasonal change of bacterial community structure over a period of several years that have considered the seasonal change of environmental factors in biofilms by comparing it with surrounding water.…”

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confidence: 99%

Seasonal Change of Bacterial Community Structure in a Biofilm Formed on the Surface of the Aquatic Macrophyte Phragmites australis

et al. 2011

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The seasonal change of bacterial community structure in biofilms on the surface of reed (Phragmites australis) was investigated for about three years (from 2005 June to 2008 March) in Lake Biwa by comparing it with that in surrounding lake water. The community structure in biofilms was different from that in the lake water throughout the seasons and years. The community structure in lake water was similar in the same seasons of different years, corresponding to similar environmental factors (i.e., temperature, dissolved oxygen, and light intensity) and nutrient ion concentrations at the same season. However, the community structure in the biofilms was not similar in the same season of different years. This seems to be due to the formation of new biofilms on sprouted reeds in every early summer and the high nutrient concentrations and bacterial density in subsequently formed biofilms. Although the community structure in the biofilms changed along with the seasonal change, the bacteria belonging to Bacillus and Paenibacillus were detected in any season. This study revealed the possibility that the bacterial community structure in the initial stage of the biofilm formation govern the subsequent seasonal change of the community structure in biofilms.Key words: biofilm, bacterial community, seasonal change, Lake BiwaIn natural environments, microorganisms attach to surfaces and form biofilms. Biofilms are ubiquitous in aquatic environments and have been proposed and confirmed to have the ability to trap and retain ions, including nutrient ions (7,10,39).In Lake Biwa, where water temperature, dissolved oxygen (D.O.), and light intensity change seasonally with similar patterns every year, we have studied the biofilms on the surfaces of reeds and stones for about three years (from June 2005 to March 2008), and revealed that the interior of the biofilms is rich in nutrients, hundreds to thousands of times greater in nutrient ion concentrations, compared with the surrounding lake water. Furthermore, we have clarified for the first time that the nutrient ion concentrations in biofilms showed a similar seasonal change every year (high in winter and low in summer) synchronized with the change of lake water (39). We found that the extracellular polymeric substances (EPS) of biofilms have electric charges (17), and in a preliminary experiment, that biofilms accumulated the nutrient ions from surrounding water (unpublished data). The biofilms seem to accumulate the nutrient ions by the ion exchange process as proposed other study (10), and form a nutrient-rich environment showing similar seasonal change to the lake water. The higher nutrient ion concentrations in biofilms and the seasonal change of the concentrations may influence the microbial community structure and activity in the biofilms. To investigate microbial community structures in biofilms by considering the internal environment of biofilms will lead to the understanding of the ecology of natural biofilms.Several studies, although based on a short period (one year at...

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“…These investigations were started again -after a longer interval -in 1988 (Lakatos and Ács 1990, 1994, Buczkó and Ács 1997 with the aim of surveying the quantitative and qualitative composition of epiphytic algae of the different lake parts, furthermore to analyse the changes of the reed periphyton in the last 20 years from an algological viewpoint. In order to gain a more complex picture about the functioning of the periphyton, algological investigations were supplemented by analyses of bacteriological and elemental composition (Ács et al 2003, Kröpfl et al 2003a, b, Záray et al 2004. Experiments on the degradation of certain pollutants (acetochlor and athrazine) -in which periphytic microbes play a primary role -have also been started (Bohuss et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Application of epiphytic diatoms in water quality monitoring of Lake Velence - recommendations and assignments

Ács¹,

Reskóné²,

Szabó³

et al. 2005

Acta Botanica Hungarica

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The suitability of benthic diatoms in the biological monitoring program of the water quality of Lake Velence was tested. Diatom indices were calculated with the aid of the software Omnidia based on reed periphyton samples collected between 1988 and 1990, and 1999 to 2004. We have pointed out which indices are appropriate for indicating the water quality changes of Lake Velence. The correlation between the indices IBD, IPS, IDG, and the total nitrogen, total phosphorus content of the water and chlorophyll-a content of the periphyton was calculated. Significant negative correlation was found between the indices and the total phosphorus content of the water. Moreover, we concluded that the chlorophyll-a content of the periphyton related to surface area can also provide information about the water quality. Based on these results the index IBD seems to be the most suitable for the water quality analysis of Lake Velence. Recommendations are provided here concerning the ecological status classification of Lake Velence based on epiphytic diatoms; unaccounted questions and future assignments are also outlined in connection with this.

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Algological and bacteriological investigations on reed periphyton in Lake Velencei, Hungary

Cited by 35 publications

References 19 publications

Ecological assessment of wetland ecosystems of northern Kazakhstan on the basis of hydrochemistry and algal biodiversity

Ecological assessment of wetland ecosystems of northern Kazakhstan on the basis of hydrochemistry and algal biodiversity

Seasonal Change of Bacterial Community Structure in a Biofilm Formed on the Surface of the Aquatic Macrophyte Phragmites australis

Application of epiphytic diatoms in water quality monitoring of Lake Velence - recommendations and assignments

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