The effects of dissolved heavy metals on attached diatoms in the Uintah Basin of Utah, U.S.A.

Rushforth, Samuel R.; Brotherson, Jack D.; Fungladda, N.; Evenson, William E.

doi:10.1007/bf00008282

Cited by 34 publications

(16 citation statements)

References 13 publications

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“…Similar results reported by Kutka and Richards (1997) showed C. meneghiniana responded negatively and G. parvulum responded positively to ammonia diffusing pots in the field studies in a Minnesota river basin. Rushforth et al (1981) also confirmed G. parvulum exhibited a better performance with a high level of ammonia, while C. meneghiniana was stimulated by a high level of nitrate.…”

Section: Sensitivity Difference Of Typical Freshwater Diatoms On Ammosupporting

confidence: 81%

Effects of different nitrogen species on sensitivity and photosynthetic stress of three common freshwater diatoms

Zhang

Zhu

et al. 2012

Aquat Ecol

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Different sources of nitrogen pose diverse effects to algal community, but the mechanism of inhibitory effects of nitrogen sources on freshwater diatoms is not fully understood. The purpose of this study was to compare biomass, photosynthetic activity, and morphological structure of three common freshwater diatoms (Cyclotella meneghiniana, Nitzschia sp., and Gomphonema parvulum) under different nitrogen sources (NO 3 -or NH 4 ?). The sorption characteristic of each diatom was investigated, and chlorophyll a (Chl-a) content and oxygen evolution rate were analyzed to investigate stress of different nitrogen sources on each diatom in the batch experiments. Ammonium lowered the growth rate of C. meneghiniana and Nitzschia sp.when it was supplied in addition to growth-saturating nitrate concentrations, suggesting a combined effect of inhibition of nitrate uptake and direct ammonium stress. Oxygen evolution rate of Nitzschia sp. showed that the direct ammonium stress on the photosynthetic activity can be alleviated by coexistence of nitrate in the nitrogen enriched treatment, but not for C. meneghiniana and G. parvulum, which may be caused by a different nitrate transporter system within algal cells. Transmission electron microscopy was used to assess the toxicity of ammonium on ultrastructural chloroplast of each diatom. Ultrastructural changes in chloroplasts showed undefined electron-dense granules and lipid droplets, but the membrane integrity of cell was maintained, suggesting an adaptation to adjustment to ammonia stress. Results showed that Cyclotella meneghiniana and Nitzschia sp. were more sensitive to ammonium stress than Gomphonema parvulum on growth, but the mechanism remains unclear.

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Section: Sensitivity Difference Of Typical Freshwater Diatoms On Ammosupporting

confidence: 81%

Effects of different nitrogen species on sensitivity and photosynthetic stress of three common freshwater diatoms

Zhang

Zhu

et al. 2012

Aquat Ecol

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“…Equally useful is the use of categories of alkalinity values in relation to diatom indicators (Descy, Empain & Lambinon, 1982). Rushforth et al, (1987) developed a similar 'niche center index' to place taxa on a weighted environmental gradient.…”

Section: Species Datamentioning

confidence: 99%

Diatoms in river water-monitoring studies

1991

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Diatoms grow abundantly in rivers, colonising almost all suitable habitats. They have been used extensively in studies related to the monitoring of water quality. This review attempts to draw together data from a wide variety of approaches. The advantage of sampling discrete habitats is stressed and particular attention is paid to the diatom flora of stone surfaces (epilithon) which is the favoured source in many studies. The advantages and drawbacks of the techniques are discussed and some hopefully helpful suggestions made. The historical development of the topic is briefly surveyed, but no attempt has been made to present a comprehensive review of the literature which has increased enormously in the last few decades.

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“…In addition, population response to heavy metals is significantly influenced by variations in natural environmental parameters, such as light and temperature (Rushforth et at., 1981). Hence biological monitoring programs based on community criteria are subject to considerable intrinsic error.…”

Section: Biological Impactmentioning

confidence: 99%