River Water with High Iron Concentration and Low pH Causes Mortality of Lamprey Roe and Newly Hatched Larvae

Myllynen, K.; Ojutkangas, Esa; Nikinmaa, Mikko

doi:10.1006/eesa.1996.1484

Cited by 34 publications

(29 citation statements)

References 13 publications

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“…Tolerant (T) and intolerant (I) species as used in the FIFI index calculations, following the classification in Pont et al (2006) instance, in the Vöyrinjoki River in Western Finland, the average pH was 5.7 but the lowest measured pH in the 322 analyses was 3.9 accompanied by tens of measurements between 4 and 4.5. The lowest pH values in streams crossing sulphide-rich soils are usually recorded during the snow-melt period or after heavy rains (Myllynen et al, 1997). The average total Al concentration in Vöyrinjoki was 7.49 mg l -1 , and the maximum was 19.0 mg l -1 (N = 107).…”

Section: Discussionmentioning

confidence: 99%

Response of fish assemblages to water quality in boreal rivers

Sutela

Vehanen²,

Jounela³

2010

Hydrobiologia

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The relationship between fluvial fish assemblages and environmental variables including water quality was studied by nonmetric multidimensional scaling (NMS) and generalised regression neural network (GRNN). Fish assemblages in the studied boreal rivers in Central Finland showed a higher response to water quality than to other environmental variables such as altitude and river width. Of the water quality parameters, total phosphorus, oxygen saturation in winter and solids had the highest influence on fish assemblages. Brown trout (Salmo trutta L.) responded to water quality strongly by favouring pristine waters. Among other fish species, the responses were lighter, and the relative contribution of environmental variables varied. Percentage of fishless sites, i.e. no catch in electrofishing, was 4.4% when pH C 6, and 38.2% when pH \ 6. However, the most effective way to influence the fish assemblage composition, and to raise the fish-based FIFI integrity index value, would be to reduce loading of solids and phosphorus, rather than depressing acidification.

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Section: Discussionmentioning

confidence: 99%

Response of fish assemblages to water quality in boreal rivers

Sutela

Vehanen²,

Jounela³

2010

Hydrobiologia

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“…Other river regulation measures such as hydropeaking (short-term flow regulation), dredging and embankment have also been associated with lamprey population decline, mainly because they decrease the quantity and quality of suitable habitat for lampreys in their different life stages (Tuunainen et al 1980, Valtonen 1980, Renaud 1997, Maitland 2003. In addition, pollution and poor water quality have occasionally been linked to population declines (Tuunainen et al 1980, Myllynen et al 1997, Mäenpää et al 2001. Fishing mortality has exceeded 50 % in some rivers entering the Bothnian Bay (Valtonen 1980, Sjöberg 2011, but in most of the rivers it is unknown, and the overall impact of exploitation on river lamprey populations is poorly understood (Sjöberg 2011, Foulds and).…”

Section: River Lamprey Populations and Negative Human Impact On Themmentioning

confidence: 99%

Distribution and abundance of river Lamprey (Lampetra fluviatilis) ammocoetes in the regulated river Perhonjoki

Ojutkangas

Aronen

Laukkanen

1995

Regul. Rivers: Res. Mgmt.

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The Kaitfors hydroelectric power plant was built, and subsequent short‐term regulation was started, in the River Perhonjoki at the beginning of the 1980s. Nine kilometres of the river were impounded and, in addition to this, regulation measures made below and above the reservoir. The effects of regulation and transplantations of mature lampreys in the areas above the dam on the distribution and abundance of ammocoetes were studied. An area suitable for ammocoete habitat and the total number of 1+ and older ammocoetes were also estimated. An inventory was performed in 1982 before the power plant was completed and then again in 1985 and 1993. Over the 11 year period ammocoete densities and suitable habitats for ammocoetes decreased markedly. In 1982 the total number of 1+ and older ammocoetes was estimated to be 1.4 million. In 1985 the estimate was 439000 individuals and in 1993 only 155000 individuals. As the result of the short‐term regulation, an ice cover was formed on the most important production sites of the river banks below the dam, making them even more uninhabitable for ammocoetes during the winter. The thick, mobile ice cover and sudden fluctuations in water flow increased erosion and therefore the quality and quantity of the production sites decreased. The embankment of the area above the reservoir caused erosion and nearly all suitable habitats for ammocoetes disappeared. As a result of regulation measures, the number of spawning habitats has decreased and their quality has worsened.

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“…An excess level of dissolved iron in ecosystems can be toxic, causing tissue damage and organ failure, and it increases the risk of cancer to humans (Puliyel et al 2015). In addition, several studies have reported the toxic effects of high iron concentrations on organisms in aquatic systems (Myllynen et al 1997;Peuranen et al 1994;Roldan and Shivers 1987). Iron toxicity is primarily mediated through the generation of oxidants, which play significant roles in many human disease states (Puliyel et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Humic acids enhance the microbially mediated release of sedimentary ferrous iron

Chang

Wei

Lin

et al. 2015

Environ Sci Pollut Res

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Iron (Fe) is an essential element for many organisms, but high concentrations of iron can be toxic. The complex relation between iron, arsenic (As), bacteria, and organic matter in sediments and groundwater is still an issue of environmental concern. The present study addresses the effects of humic acids and microorganisms on the mobilization of iron in sediments from an arsenic-affected area, and the microbial diversity was analyzed. The results showed that the addition of 50, 100, and 500 mg/L humic acids enhanced ferrous iron (Fe(II)) release in a time-dependent and dose-dependent fashion under anaerobic conditions. A significant increase in the soluble Fe(II) concentrations occurred in the aqueous phases of the samples during the first 2 weeks, and aqueous Fe(II) reached its maximum concentrations after 8 weeks at the following Fe(II) concentrations: 28.95 ± 1.16 mg/L (original non-sterilized sediments), 32.50 ± 0.71 mg/L (50 mg/L humic acid-amended, non-sterilized sediments), 37.50 ± 1.85 mg/L (100 mg/L humic acid-amended, non-sterilized sediments), and 39.00 ± 0.43 mg/L (500 mg/L humic acid-amended, non-sterilized sediments). These results suggest that humic acids can further enhance the microbially mediated release of sedimentary iron under anaerobic conditions. By contrast, very insignificant amounts of iron release were observed from sterilized sediments (the abiotic controls), even with the supplementation of humic acids under anaerobic incubation. In addition, the As(III) release was increased from 50 ± 10 μg/L (original non-sterilized sediments) to 110 ± 45 μg/L (100 mg/L humic acid-amended, non-sterilized sediments) after 8 weeks of anaerobic incubation. Furthermore, a microbial community analysis indicated that the predominant class was changed from Alphaproteobacteria to Deltaproteobacteria, and clearly increased populations of Geobacter sp., Paludibacter sp., and Methylophaga sp. were found after adding humic acids along with the increased release of iron and arsenic. Our findings provide evidence that humic acids can enhance the microbially mediated release of sedimentary ferrous iron in an arsenic-affected area. It is thus suggested that the control of anthropogenic humic acid use and entry into the environment is important for preventing the subsequent iron contamination in groundwater.

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River Water with High Iron Concentration and Low pH Causes Mortality of Lamprey Roe and Newly Hatched Larvae

Cited by 34 publications

References 13 publications

Response of fish assemblages to water quality in boreal rivers

Response of fish assemblages to water quality in boreal rivers

Distribution and abundance of river Lamprey (Lampetra fluviatilis) ammocoetes in the regulated river Perhonjoki

Humic acids enhance the microbially mediated release of sedimentary ferrous iron

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