Search Results - "Perkins, R G"

Microspatial variability in community structure and photophysiology of calcified macroalgal microbiomes revealed by coupling of hyperspectral and high-resolution fluorescence imaging by Perkins, R. G., Williamson, C. J., Brodie, J., Barillé, L., Launeau, P., Lavaud, J., Yallop, M. L., Jesus, B.

“…Calcifying coralline macroalgae provide biogenic habitats colonised by epiphytic microalgae that contribute significantly to community productivity…”
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Light response curve methodology and possible implications in the application of chlorophyll fluorescence to benthic diatoms by PERKINS, R. G, MOUGET, J.-L, LEFEBVRE, S, LAVAUD, J

“…Chlorophyll a fluorescence has been increasingly applied to benthic microalgae, especially diatoms, for measurements of electron transport rate (ETR) and…”
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Predictable temperature-regulated residency, movement and migration in a large, highly mobile marine predator (Negaprion brevirostris) by Kessel, S. T., Chapman, D. D., Franks, B. R., Gedamke, T., Gruber, S. H., Newman, J. M., White, E. R., Perkins, R. G.

“…Understanding how and why animals are distributed through time and space has always been a fundamental component of ecology and is an essential prerequisite…”
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Patterns in Microphytobenthic Primary Productivity: Species-Specific Variation in Migratory Rhythms and Photosynthetic Efficiency in Mixed-Species Biofilms by Underwood, G. J. C., Perkins, R. G., Consalvey, M. C., Hanlon, A. R. M., Oxborough, K., Baker, N. R., Paterson, D. M.

“…The importance of temporal changes in the vertical distribution of microphytobenthic algae on the overall functioning of intertidal biofilms were investigated…”
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Vertical cell movement is a primary response of intertidal benthic biofilms to increasing light dose by Perkins, R. G., Lavaud, J., Serôdio, J., Mouget, J. L., Cartaxana, P., Rosa, P., Barille, L., Brotas, V., Jesus, B. M.

“…Intertidal soft sediment microphytobenthic biofilms are often dominated by diatoms, which are able to regulate their photosynthesis by physiological processes…”
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The potential for phosphorus release across the sediment–water interface in an eutrophic reservoir dosed with ferric sulphate by Perkins, R.G., Underwood, G.J.C.

“…Alton Water, Suffolk, UK is a pumped storage reservoir that has a history of cyanobacterial blooms. Dosing of the input water with ferric sulphate to control…”
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Responses of microphytobenthos to light: primary production and carbohydrate allocation over an emersion period by Perkins, R. G., Underwood, G. J. C., Brotas, V., Snow, G. C., Jesus, B., Ribeiro, L.

“…The effect of high (ambient) and low (shaded to 50% of ambient) light on microphytobenthic biofilm primary production, vertical migration and allocation of…”
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The importance of nutrient ratios in determining elevations in geosmin synthase (geoA) and 2-MIB cyclase (mic) resulting in taste and odour events by Hooper, A.S., Kille, P., Watson, S.E., Christofides, S.R., Perkins, R.G.

“…•geoA is a suitable proxy for geosmin production in drinking water supply reservoirs.•Nutrient ratios (NH4+:NO3− and TIN:TP) are important triggers for…”
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Can chlorophyll fluorescence be used to estimate the rate of photosynthetic electron transport within microphytobenthic biofilms? by Perkins, R. G., Oxborough, K., Hanlon, A. R. M., Underwood, G. J. C., Baker, N. R.

“…Chlorophyll fluorometry has frequently been used to estimate the photosynthetic electron transport rate (ETR) within oxygenic organisms. One of the…”
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Content versus concentration: Effects of units on measuring the biogeochemical properties of soft sediments by Tolhurst, T.J., Underwood, A.J., Perkins, R.G., Chapman, M.G.

“…A variety of scientific disciplines require measurements of the biological, physical and chemical (biogeochemical) properties of soft sediments. These…”
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Gradients of chlorophyll a and water chemistry along an eutrophic reservoir with determination of the limiting nutrient by in situ nutrient addition by Perkins, R.G, Underwood, G.J.C

“…Alton Water, Suffolk, UK, is a linear reservoir, with input water pumped into the northwest end and drawoff tower in the main basin at the southeast end. The…”
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Managing taste and odour metabolite production in drinking water reservoirs: The importance of ammonium as a key nutrient trigger by Perkins, R.G., Slavin, E.I., Andrade, T.M.C., Blenkinsopp, C., Pearson, P., Froggatt, T., Godwin, G., Parslow, J., Hurley, S., Luckwell, R., Wain, D.J.

“…Taste and odour (T&O) compounds (most commonly 2-MIB and Geosmin) in drinking water are becoming an increasingly global problem for water management. Here, the…”
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Impact of copper sulphate treatment on cyanobacterial blooms and subsequent water quality risks by Watson, S.E., Taylor, C.H., Bell, V., Bellamy, T.R., Hooper, A.S., Taylor, H., Jouault, M., Kille, P., Perkins, R.G.

“…Control of algal blooms and associated biologically-induced water quality risks in drinking reservoirs is problematic. Copper sulphate (CuSO4) treatment is one…”
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Effects of vertical migrations by benthic microalgae on fluorescence measurements of photophysiology by Jesus, B., Perkins, R. G., Consalvey, M., Brotas, V., Paterson, D. M.

“…During tidal emersion, microphytobenthic algae (principally pennate diatoms) migrate vertically within the top mm of sediment to form transient biofilms. This…”
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The Effects of Surface Mixers on Stratification, Dissolved Oxygen, and Cyanobacteria in a Shallow Eutrophic Reservoir by Slavin, E. I., Wain, D. J., Bryant, L. D., Amani, M., Perkins, R. G., Blenkinsopp, C., Simoncelli, S., Hurley, S.

“…Top‐down surface mixers are increasingly used in drinking water reservoirs to prevent the development of stratification, control cyanobacteria, and limit…”
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Reduction in photosynthetic efficiency of Cladophora glomerata, induced by overlying canopies of Lemna spp by Parr, L.B, Perkins, R.G, Mason, C.F

“…The duckweeds Lemna minor L. and L. minuscula Herter reduced PSII quantum efficiency ( F q′/ F m′) of the filamentous green alga Cladophora glomerata Kützing…”
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Changes in microphytobenthic chlorophyll a and EPS resulting from sediment compaction due to de-watering: opposing patterns in concentration and content by Perkins, R.G., Honeywill, C., Consalvey, M., Austin, H.A., Tolhurst, T.J., Paterson, D.M.

“…The study of estuarine microphytobenthos often involves the observation of data over diel, tidal and seasonal timescales. Algal biomass is usually measured…”
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Partial recovery of a eutrophic reservoir through managed phosphorus limitation and unmanaged macrophyte growth by PERKINS, R. G, UNDERWOOD, G. J. C

“…Recovery from an algal to a macrophyte-dominated state in a freshwater system can require both nutrient reduction and a switch to initiate the change. Despite…”
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Three decades of longlining in Bimini, Bahamas, reveals long-term trends in lemon shark Negaprion brevirostris (Carcharhinidae) catch per unit effort by Kessel, S. T., Hansell, A. C., Gruber, S. H., Guttridge, T. L., Hussey, N. E., Perkins, R. G.

“…In Bimini, Bahamas, the consistent employment of longlines, beginning in 1982, provided a rare opportunity to explore population trends for large resident…”
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Low-temperature SEM imaging of polymer structure in engineered and natural sediments and the implications regarding stability by Perkins, R.G., Davidson, I.R., Paterson, D.M., Sun, H., Watson, J., Player, M.A.

“…Interpretation of electron micrographs is often used as qualitative support of quantitative data. Conventional and low-temperature scanning electron microscopy…”
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