The effects of artificial ammonium enhancement on riverine periphytic diatom communities

Hurlimann, J. H.; Schanz, Fritz

doi:10.1007/bf00877258

Cited by 21 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Means ± 1 S.E. Spearman's correlation coefficient shown T5), since Hürlimann & Schanz (1993) reported a significant diatom decline with ammonium values over 60 lg L -1 . High ammonium concentrations might also suppress zygnematophyceans, mainly desmidiaceans (Bonacina, 2001).…”

Section: Discussionmentioning

confidence: 99%

Response of epiphytic algae to nutrient loading and fish density in a shallow lake: a mesocosm experiment

et al. 2007

View full text Add to dashboard Cite

Studies on the effect of eutrophication on the ecology of shallow lakes, usually pay scant attention to changes within the epiphytic algal community, though the contribution of this to the ecosystem dynamics is transcendental. In order to test the influence of nutrient loadings and fish densities in the structure of algal epiphyton in a shallow lake, an experiment was performed using in situ mesocosms. Nutrient additions were related to significant decreases in the total epiphyton biovolume and that of bacillariophyceans and zygnematophyceans, but with increases in the abundance of cyanobacteria. The different response of algal groups at the higher nutrient concentrations (increases or decreases in their abundance and/or biovolume) can be related to their ecophysiological constraints such as different resistance to toxicant ammonium accumulation. Plant-associated macroinvertebrates numbers were positively correlated with total numbers of epiphyton. The presence of planktivorous fish enhanced the abundance and biovolume of all algal groups, except cyanobacteria. Fishes enhanced the abundance of plant-associated animals and of total epiphyton. Fish indirect effects (e.g., nutrients release) and their dietary particularities were among the factors that together with nutrients influenced epiphyton growth. The role of indirect effects of fishes and the importance of their dietary particularities are stressed as key factors to understand the processes controlling epiphyton ecology and the food web structure of shallow lakes.

show abstract

Section: Discussionmentioning

confidence: 99%

Response of epiphytic algae to nutrient loading and fish density in a shallow lake: a mesocosm experiment

et al. 2007

View full text Add to dashboard Cite

show abstract

“…For Fragilaria crotonensis, found in Lake Jues during the Subatlantic, the combined TP-data set shows no clear relation to TP-concentrations and confirms the estimate of Hofmann (1994Hofmann ( , 1999. Nitzschia paleacea, common in Lake Jues only during the Older Subatlantic, is an eutraphentic species (Hofmann 1994(Hofmann , 1999, that additionally indicates high NH 4 -concentrations (Hürlimann and Schanz 1993) and becomes more abundant with increasing organic pollution (a-mesosaprobic, Krammer andLange-Bertalot 1986-1991). Stephanodiscus alpinus occurred nearly exclusively during the Preboreal and Boreal.…”

Section: Diatom Stratigraphy and Ecologymentioning

confidence: 99%

Seasonal variability of Holocene climate: a palaeolimnological study on varved sediments in Lake Jues (Harz Mountains, Germany)

et al. 2008

View full text Add to dashboard Cite

Studies combining sedimentological and biological evidence to reconstruct Holocene climate beyond the major changes, and especially seasonality, are rare in Europe, and are nearly completely absent in Germany. The present study tries to reconstruct changes of seasonality from evidence of annual algal successions within the framework of well-established pollen zonation and 14 C-AMS dates from terrestrial plants. Laminated Holocene sediments in Lake Jues (10°20.7 0 E, 51°39.3 0 N, 241 m a.s.l.), located at the SW margin of the Harz Mountains, central Germany, were studied for sediment characteristics, pollen, diatoms and coccal green algae. An age model is based on 21 calibrated AMS radiocarbon dates from terrestrial plants. The sedimentary record covers the entire Holocene period. Trophic status and circulation/ stagnation patterns of the lake were inferred from algal assemblages, the subannual structure of varves and the physico-chemical properties of the sediment. During the Holocene, mixing conditions alternated between di-, oligo-and meromictic depending on length and variability of spring and fall periods, and the stability of winter and summer weather. The trophic state was controlled by nutrient input, circulation patterns and the temperature-dependent rates of organic production and mineralization. Climate shifts, mainly in phase with those recorded from other European regions, are inferred from changing limnological conditions and terrestrial vegetation. Significant changes occurred at 11,600 cal. yr. BP (Preboreal warming), between 10,600 and 10,100 cal. yr. BP (Boreal cooling), and between 8,400 and 4,550 cal. yr. BP (warm and dry interval of the Atlantic). Since 4,550 cal. yr. BP the climate became gradually cooler, wetter and more oceanic. This trend was interrupted by warmer and dryer phases between 3,440 and 2,850 cal. yr. BP and, likely, between 2,500 and 2,250 cal. yr. BP.

show abstract

“…It is com monly found in alkaline, slightly brackish waters. It has been described as an obligatory nitrogen heterotroph and is tolerant of heavy organic pollution (Hürlimann and Schanz, 1993;Lange-Bertalot, 1978). It is unclear where in Kettle Lake this diatom would have been growing, but likely it occurred below the mixo limnion, where conditions would be more alkaline and ammo nium supply from the sediments would be plentiful.…”

Section: Diatom Group 4: Low Groundwater Flow Meromictic Lake Few Dia-mentioning

confidence: 99%

Environmental history of a closed-basin lake in the US Great Plains: Diatom response to variations in groundwater flow regimes over the last 8500 cal. yr BP

et al. 2011

View full text Add to dashboard Cite

Sediment records from closed-basin lakes in the Northern Great Plains (NGP) of North America have contributed significantly to our understanding of regional paleoclimatology. A high-resolution (near decadal) fossil diatom record from Kettle Lake, ND, USA that spans the last 8500 cal. yr BP is interpreted in concert with percent abundance of aragonite in the sediment as an independent proxy of groundwater flow to the lake (and thus lake water level). Kettle Lake has been relatively fresh for the majority of the Holocene, likely because of the coarse substrata and a strong connection to the underlying aquifer. Interpretation of diatom assemblages in four groups indicative of low to high groundwater flow, based on the percent of aragonite in sediments, allow interpretations of arid periods (and probable meromictic lake conditions) that could not be detected based on diatom-based salinity reconstructions alone. At the centennial–millennial scale, the diatom record suggests humid/wet periods from 8351 to 8088, 4364 to 1406 and 872 to 620 cal. yr BP, with more arid periods intervening. During the last ~ 4500 years, decadal–centennial scale periods of drought have taken place, despite the generally wetter climate. These droughts appear to have had similar impacts on the Kettle Lake hydrology as the ‘Dust Bowl’ era droughts, but were longer in duration.

show abstract

The effects of artificial ammonium enhancement on riverine periphytic diatom communities

Cited by 21 publications

References 13 publications

Response of epiphytic algae to nutrient loading and fish density in a shallow lake: a mesocosm experiment

Response of epiphytic algae to nutrient loading and fish density in a shallow lake: a mesocosm experiment

Seasonal variability of Holocene climate: a palaeolimnological study on varved sediments in Lake Jues (Harz Mountains, Germany)

Environmental history of a closed-basin lake in the US Great Plains: Diatom response to variations in groundwater flow regimes over the last 8500 cal. yr BP

Contact Info

Product

Resources

About