The significance of atmospheric deposition of heavy metals in four Danish lakes

Larsen, Vagh Juhl

doi:10.1016/0048-9697(83)90006-2

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…Filamentous algae. Sphagnum and^uncus are abundant (Grahn, 1977;Larsen, 1983;Reolofs, 1983;Arts et al, 1990;Henriksen et al, 1988). In eutrophic lakes concentrations of NO^, PO^ and sometimes NH4, in bulk-water, and PO^ and NH^ in sediments are very high.…”

Section: Discrssionmentioning

confidence: 99%

Seasonal variation in the ecophysiology of Littorella uniflora (L.) Ascherson in acidic and eutrophic habitats

Robe

Griffiths

1992

New Phytologist

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SUMMARYThe ecophysiology of the submersed aquatic macrophyte, Littorella unijiora (L.) Ascherson, has been compared at acidic and eutrophic habitats in the Lake District, 'I'he physico-chemical enYlronment (bulk-water and sediment-interstitial-water pH, CO^, O^, nutrient concentrations and PAR) have been related to seasonal photosynthesis (CAM activity, [COj]^ and CO^ and PAR response characteristics) and leaf growth rate of adult plants and ramets. In general, the environment was more favourable for plant growth at Esthwaite Water (the eutrophic site) than at Red Tarn (acidic). Although bulk-water pH was higher at Esthwaite, sediments were deeper and interstitial water CO^ concentrations greater. Concentrations of nitrate and ammonium, phosphorus and potassium were also higher. However, shading by phytoplankton blooms and epiphytes reduced PAR incident on Esthwaite plants. Photosynthetic characteristics and growth of L. uniftora followed the seasonal changes in PAR and temperature. However, Esthwaite L. unifiora showed greater CAM activity, and slightly higher [CO^Ji and photosynthetic capacity. Esthwaite plants also possessed more numerous, shorter leaves with greater chlorophyll and nitrogen content, and leaf growth rate and ramet production were greater than for Red Tarn plants, Esthwaite L. unifiora transplanted to Red Tarn showed higher rates of growth than native Esthwaite plants, while Red Tarn L. unifiora transplanted to Esthwaite performed poorly and retained the lower rate of ramet growth found in native Red Tarn plants. End of season productivit\-was greatest in Esthwaite to Red Tarn transplants and lowest in Red Tarn to Esthwaite transplants. The relationships between environmental conditions and plant performance at the two sites are discussed in the context of the disappearance of L. unifiora from acidic and eutrophic sites in N. Europe in recent years.

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Section: Discrssionmentioning

confidence: 99%