Diatom species composition along a thermal gradient in the Portneuf River, Idaho, USA

Vinson, Deanna K.; Rushforth, Samuel R.

doi:10.1007/bf00006066

Cited by 23 publications

(10 citation statements)

References 30 publications

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“…Sources of variability in benthic diatom assemblages include: temperature, light, nature of substratum, nutrient availability, space, natural successional processes, grazing and hydromorphological regime (Vinson & Rushforth, 1989;Allan, 1995;Cazaubon et al, 1995;Hill, 1996;Burkholder, 1996;Borchardt, 1996;Passy, 2001). While diatoms collected from the surface layers of lake sediment cores provide an 'integrated' sample incorporating the spatial and temporal variability within that lake (Battarbee et al, 2001), assemblages in littoral regions of lakes and stream/river beds are highly dynamic and samples taken on one occasion provide a shorter 'environmental history' (Biggs, 1996;King et al, 2006;.…”

Section: Discussionmentioning

confidence: 99%

Uncertainty in ecological status assessments of lakes and rivers using diatoms

Kelly¹,

Bennion

Burgess

et al. 2009

Hydrobiologia

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The EU's Water Framework Directive requires all surface water bodies to be classified according to their ecological status. As biological communities show both spatial and temporal heterogeneity, expressions of ecological status will, inevitably, have an element of uncertainty associated with them. A consequence of this environmental heterogeneity is that there is a risk that status inferred from one or more samples is different to the true status of that water body. In order to quantify the scale of temporal uncertainty associated with benthic diatoms, replicate samples were collected from sites across the ecological status gradient in lakes and rivers in the UK. Variability (expressed as standard deviation of temporal replicate samples from a single site) could be described using a polynomial function and this was then used to calculate the risk of placing a water body in the wrong ecological status class. This risk varied depending on the distance from the class boundaries and the number of replicates. Based on these data, we recommend that ecological status is determined from a number of samples collected from a site over a period of time.

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Section: Discussionmentioning

confidence: 99%

Uncertainty in ecological status assessments of lakes and rivers using diatoms

Kelly¹,

Bennion

Burgess

et al. 2009

Hydrobiologia

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“…Taking into account a third algal group of summer diatoms, characterized by a different relationship between growth rate and temperature, would likely improve the simulations. Analyzing diatom species along a thermal gradient, Vinson and Rushforth (1989) showed that certain diatom species showed a preference for temperature > 20°C, whereas others had a preference for temperature < 15°C. However, more data are needed on the Seine River to adequately identify the composition of the summer community of diatoms and its associated physiology.…”

Section: Discussionmentioning

confidence: 99%

Seasonal succession of diatoms and Chlorophyceae in the drainage network of the Seine River: Observation and modeling

Gamier

Billen²,

Coste³

1995

Limnol. Oceanogr.

300

241

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Seasonal succession of diatoms and Chlorophyceae have been analyzed in the Seine River system (France), which is characterized by a temperate oceanic hydrological regime and high nutrient enrichment. Phytoplankton development is invariably initiated by the decrease of discharge in spring. When this occurs in early spring, the bloom is dominated by diatoms that severely deplete silica, and a regular increase of their biomass is observed along the river continuum from headwaters to the estuary. The bloom occurs earlier downstream than upstream. Chlorophyceae succeed the diatoms by the end of May and represent a significant component of the summer phytoplankton population. Fluctuations of the phytoplankton biomass are observed within the continuum in summer, with high biomass in 6th-order rivers, low biomass in 7th-order rivers, and again high biomass in &h-order rivers. These seasonal and spatial variations are interpreted with the aid of a mathematical model (the RIVERSTRAHLER model); the model calculates the development of diatoms and Chlorophyceae within the whole drainage network which is represented as a regular pattern of confluences of tributaries with increasing stream order. The model, taking into account both bottom-up and top-down regulating factors of phytoplankton, has proved to be a powerful tool in understanding the dynamics of a large drainage network.Seasonal periodicity of phytoplankton has largely been described in lakes. Conceptual models (e.g. the PEG model, Sommer et al. 1986) have emerged from the synthesis of many studies carried out in a large number of lentic systems, and they describe the seasonal events in function of regulating factors: physical and energetic (hydrology, mixing, light, and temperature), nutritional (nutrients availability), and biological (grazing, sinking, and parasitism). A similar synthesis is not available for lotic systems. In most large rivers with temperate oceanic hydrological regimes, a bloom dominated by diatoms occurs after the decrease of discharge in spring, whereas a mixed population of Chlorophyceae and diatoms composes the summer phytoplankton.This pattern has been observed Acknowledgments

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“…Achnanthes species are mostly recorded from cold waters with decreasing abundance at temperatures above 14 °C (vinson & RushFoRth 1989). In our material these morphotypes appeared in short colonies suspended in the water (Figs 6, 7) and connected to the shell surface by mucilage stalks ('pedunculate' mode of attachment, sensu Round et al 1990).…”

Section: Epibiotic Diatomsmentioning

confidence: 55%

“…euglypta, with raphe valves closely appressed to the substrate ('adnate' mode of attachment, sensu Round et al 1990) and seemed to prevail all over the shell surface (Figs 8,9). This diatom, and the genus as a group, is considered as a thermophilic species preferring temperatures over 22 °C (squiRes et al 1979;vinson & RushFoRth 1989). It was found in Greece also as epibiont on the shells of another gastropod of Hydrobiidae, Potamopyrgus antipodarum (J.E.…”

Section: Epibiotic Diatomsmentioning

confidence: 99%

Photosynthetic microorganisms as epibionts and euendoliths on biotic substrates in a thermal spring with ferric-iron deposits.

Radea¹,

Louvrou²,

Pantazidou³

et al. 2010

Fottea

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Rust-coloured shells of the aquatic gastropod Ventrosia ventrosa, a new record for eastern Greece, indicating presence of iron (EDAX analysis) were studied for detection of iron-encrusted photosynthetic epibionts in a Greek brackish-water thermal spring (38 °C). Microscopic analyses (LM, SEM) revealed the presence of a biofilm consisted of mostly facultative micro-epibionts, i.e. a) 5 periphytic taxa of coccal and filamentous cyanobacteria, including a taxonomically and ecologically interesting morphospecies, Xenococcus cf. pyriformis, dominated exclusively on the shell surface, and b) pennate diatoms with higher species richness (18 periphytic taxa of the genera Amphora, Brachysira, Cymbella, Diatoma, Encyonema, Navicula, Nitzschia, Pleurosigma, Synedra, Ulnaria; 5 taxa as new records for Greece), most of them emerging only after acid treatment of whole gastropod shells. The abundant diatoms thriving directly or nearby the iron-coatings (Cocconeis placentula var. euglypta and Achnanthes brevipes sensu lato) exhibited different modes of attachment ('adnate' and 'pendunculate', respectively). Two euendolithic cyanobacteria (Hyella sp. and Leptolyngbya terebrans; the former with special taxonomic interest) were also found perforating the delicate gastropod shells, with no distinct differentiation in the extent of infestation between live and dead gastropod shells. Moreover, the possible impact of these encrusted photosynthetic assemblages on V. ventrosa was investigated; statistical analysis showed that a) there is no 'drag effect', induced by the epibionts, influencing the gastropod growth (i.e. shell length), b) shell size enlargement provides a favourable space and promotes the intense fouling by both micro-epibionts and macro-epibionts (eggcapsules), and c) the detachment prevention of egg-capsules is attributed to the biofilm development.

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Diatom species composition along a thermal gradient in the Portneuf River, Idaho, USA

Cited by 23 publications

References 30 publications

Uncertainty in ecological status assessments of lakes and rivers using diatoms

Uncertainty in ecological status assessments of lakes and rivers using diatoms

Seasonal succession of diatoms and Chlorophyceae in the drainage network of the Seine River: Observation and modeling

Photosynthetic microorganisms as epibionts and euendoliths on biotic substrates in a thermal spring with ferric-iron deposits.

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