Periphyton in running waters – long-term studies of natural variation

Lindstrøm, E.-A.; Johansen, Stein W.; Saloranta, Tuomo

doi:10.1023/b:hydr.0000026351.68927.ee

Cited by 30 publications

(13 citation statements)

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“…1). Moreover, daily average temperatures of air in March-April were lower than 5°C, which generally is accepted as a threshold for growth (Lindstrom et al 2004). Then, second peaks (2003 and 2004) or relatively high levels (2005) of the algal biomass were observed in summer; however, they were significantly lower than those in spring.…”

Section: Resultsmentioning

confidence: 99%

Seasonal distribution and fatty acid composition of littoral microalgae in the Yenisei River

et al. 2009

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We studied fatty acid (FA) composition of littoral microalgae in the fast-flowing oligotrophic river, the Yenisei, Siberia, monthly for 3 years. Seasonal dynamics of species composition had similar patterns in all the studied years. In springs, a pronounced dominance of filamentous green algae occurred, in summer and autumn diatoms were abundant, and in late autumn and winter epilithic biofilms consisted primarily of cyanobacteria and detritus. In general, FA composition of the algal periphytic community was dominated by 16:0, 16:1ω7, 20:5ω3, 14:0, and 18:3ω3 throughout the studied period. Several groups of FAs, which had peculiar seasonal dynamics, were differentiated by statistical analysis based on a method of correlation graphs. The seasonal changes in FA composition could be partly explained by the seasonal succession of species composition of the community. Besides, we found that populations of both diatom and green algae grown in summer at a higher water temperature were lower in polyunsaturated fatty acids than those in spring, at a lower temperature. Hence, we suppose that the regular seasonal dynamics of FA composition of the studied littoral microalgae was driven both by changes in species composition and by temperature adaptations of the algal populations. The highest content of essential polyunsaturated FAs, eicosapentaenoic and docosahexaenoic acids, in the spring "psychrophilic" populations of diatoms could make them of the higher nutritive value for zoobenthic primary consumers.

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Section: Resultsmentioning

confidence: 99%

Seasonal distribution and fatty acid composition of littoral microalgae in the Yenisei River

et al. 2009

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“…0:5 lg l À1 P; Bothwell 1989), while filamentous green algae can grow maximally at levels from 25-60 lg l À1 P (Rosemarin 1983). In streams, P limitation can be caused where both N and P are limiting by a shift in the community composition towards algal species that can fix N. Periphyton community composition can change in parallel with the nutrient status of an ecosystem at the scale of an entire creek system (Chételat et al 1999) or can change among reaches along longitudinal gradients (Lindstrøm et al 2004). …”

Section: Discussionmentioning

confidence: 99%

Spatial variance of nutrient limitation of periphyton in montane, headwater streams (McLeod River, Alberta, Canada)

Irvine

Jackson

2006

Aquat Ecol

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There have been few studies that have examined the spatial variance of nutrient limitation over the scale of an entire set of headwater streams. We used nutrient diffusing substrata experiments (control, nitrogen addition, phosphorus addition, and nitrogen+phosphorus addition) to examine how nutrient limitation varied throughout the five creeks that comprise the McLeod River headwaters (Alberta, Canada). We assessed the variance of chlorophyll a accrual at spatial scales within reach, within creek, among creeks and across linear distance within the entire watershed to assess the consistency and scale of nutrient limitation. We analyzed the importance of the spatial scale using several methods. We assessed the coefficient of variation at different scales, the spatial covariance of nitrogen and phosphorus deficiency indices using a spline correlogram, and the variance through traditional analyses of variance methods. Chlorophyll a accrual responded significantly to nutrients in all creeks, though the response varied in magnitude and in the limiting nutrient among reaches and among creeks. Variance in chlorophyll a accrual was due primarily to the factor of creek (R 2 =0.40) and secondarily to reach (R 2 =0.07). The CV was 31.4% among creeks, 18.4% among reaches, and 17.9% within reaches. The N deficiency index showed a positive correlation at sites located <4 km apart and a negative correlation at sites greater than 6.5 km apart. The P deficiency index showed no discernible spatial correlation. Our results suggest that nutrient limitation varies on small scales and is often driven by local processes.

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“…Benthic algae sampling method Benthic algae, i.e., algae that live attached to the river bottom or in close contact on or within patches of attached aquatic plants, were surveyed according to the established method in Norway (Lindstrøm et al, 2004;EN, European Committee for Standardization, 2009) along an approximately 10-m length of river bottom using an aquascope. At each site, visible benthic algae were collected and stored separately in vials.…”

Section: Methodsmentioning

confidence: 99%

“…The algal flora in Norwegian rivers is typically best developed by autumn (Lindstrøm et al, 2004). Therefore, benthic algae samples taken between December and May were excluded for calculating species optima.…”

Section: Bioavailable Phosphorusmentioning

confidence: 99%

The periphyton index of trophic status PIT: a new eutrophication metric based on non-diatomaceous benthic algae in Nordic rivers

Schneider

Lindstrøm

2011

Hydrobiologia

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Eutrophication is one of the major problems for surface water quality in Norway, particularly in the lowlands near settlements and agricultural areas. Here, we present a new index based on nondiatomaceous benthic algae (Periphyton index of trophic status, PIT) which is developed on a dataset of [500 samples from [350 sites from the Norwegian mainland and can be used to describe trophic status at a river site. PIT indicator values for benthic algae taxa are derived from water total phosphorus concentrations and range from 1.87 for Stigonema hormoides to 68.91 for Tribonema sp. PIT site values range from 3.42 to 44.45 and cover a range from oligotrophic to eutrophic conditions. The relationship between the PIT and the total phosphorus concentration has one major threshold at 10 lg/l TP, with a slow increase below and a steep increase above 10 lg/l. We conclude that benthic algae species composition at nutrient poor sites reacts only slightly to small increases in phosphorus concentration, while it is most sensible to eutrophication in the range between 10 and 30 lg TP/l. For the genus Oedogonium, we found a significant positive correlation between filament width and TP concentration, making Oedogonium an easy to use eutrophication indicator.

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Periphyton in running waters – long-term studies of natural variation

Cited by 30 publications

References 0 publications

Seasonal distribution and fatty acid composition of littoral microalgae in the Yenisei River

Seasonal distribution and fatty acid composition of littoral microalgae in the Yenisei River

Spatial variance of nutrient limitation of periphyton in montane, headwater streams (McLeod River, Alberta, Canada)

The periphyton index of trophic status PIT: a new eutrophication metric based on non-diatomaceous benthic algae in Nordic rivers

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