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121 results on '"Brown, G.S."'

2. Developing common protocols to measure tundra herbivory across spatial scales

Author

Barrio, I.C., primary, Ehrich, D., additional, Soininen, E.M., additional, Ravolainen, V.T., additional, Bueno, C.G., additional, Gilg, O., additional, Koltz, A.M., additional, Speed, J.D.M., additional, Hik, D.S., additional, Mörsdorf, M., additional, Alatalo, J.M., additional, Angerbjörn, A., additional, Bêty, J., additional, Bollache, L., additional, Boulanger-Lapointe, N., additional, Brown, G.S., additional, Eischeid, I., additional, Giroux, M.A., additional, Hájek, T., additional, Hansen, B.B., additional, Hofhuis, S.P., additional, Lamarre, J.-F., additional, Lang, J., additional, Latty, C., additional, Lecomte, N., additional, Macek, P., additional, McKinnon, L., additional, Myers-Smith, I.H., additional, Pedersen, Å.Ø., additional, Prevéy, J.S., additional, Roth, J.D., additional, Saalfeld, S.T., additional, Schmidt, N.M., additional, Smith, P., additional, Sokolov, A., additional, Sokolova, N., additional, Stolz, C., additional, van Bemmelen, R., additional, Varpe, Ø., additional, Woodard, P.F., additional, and Jónsdóttir, I.S., additional

Published
2022
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3. Developing common protocols to measure tundra herbivory across spatial scales

Author

Barrio, I.C., Ehrich, D., Soininen, E.M., Ravolainen, V.T., Bueno, C.G., Gilg, O., Koltz, A.M., Speed, J.D.M., Hik, D.S., Mörsdorf, M., Alatalo, J.M., Angerbjörn, A., Bêty, J., Bollache, L., Boulanger-lapointe, N., Brown, G.S., Eischeid, I., Giroux, M.A., Hájek, T., Hansen, B.B., Hofhuis, S.P., Lamarre, J.F., Lang, J., Latty, C., Lecomte, N., Macek, P., Mckinnon, L., Myers-smith, I.H., Pedersen, Å.O., Prevéy, J.S., Roth, J.D., Saalfeld, S.T., Schmidt, N.M., Smith, P., Sokolov, A., Sokolova, N., Stolz, C., van Bemmelen, R., Varpe, Ø., Woodard, P.F., Jónsdóttir, I.S., Barrio, I.C., Ehrich, D., Soininen, E.M., Ravolainen, V.T., Bueno, C.G., Gilg, O., Koltz, A.M., Speed, J.D.M., Hik, D.S., Mörsdorf, M., Alatalo, J.M., Angerbjörn, A., Bêty, J., Bollache, L., Boulanger-lapointe, N., Brown, G.S., Eischeid, I., Giroux, M.A., Hájek, T., Hansen, B.B., Hofhuis, S.P., Lamarre, J.F., Lang, J., Latty, C., Lecomte, N., Macek, P., Mckinnon, L., Myers-smith, I.H., Pedersen, Å.O., Prevéy, J.S., Roth, J.D., Saalfeld, S.T., Schmidt, N.M., Smith, P., Sokolov, A., Sokolova, N., Stolz, C., van Bemmelen, R., Varpe, Ø., Woodard, P.F., and Jónsdóttir, I.S.

Abstract

Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts and standardized methodologies. We designed, applied, and assessed standardized protocols to measure tundra herbivory at three spatial scales: plot, site (habitat), and study area (landscape). The plot- and site-level protocols were tested in the field during summers 2014–2015 at 11 sites, nine of them consisting of warming experimental plots included in the International Tundra Experiment (ITEX). The study area protocols were assessed during 2014–2018 at 24 study areas across the Arctic. Our protocols provide comparable and easy to implement methods for assessing the intensity of invertebrate herbivory within ITEX plots and for characterizing vertebrate herbivore communities at larger spatial scales. We discuss methodological constraints and make recommendations for how these protocols can be used and how sampling effort can be optimized to obtain comparable estimates of herbivory, both at ITEX sites and at large landscape scales. The application of these protocols across the tundra biome will allow characterizing and comparing herbivore communities across tundra sites and at ecologically relevant spatial scales, providing an important step towards a better understanding of tundra ecosystem responses to large-scale environmental change.

Published
2022

6. Comment on “Global pattern of nest predation is disrupted by climate change in shorebirds”

Author

Bulla, M., Reneerkens, J., Weiser, E.L., Sokolov, A., Taylor, A.R., Sittler, B., McCaffery, B.J., Ruthrauff, D.R., Catlin, D.H., Payer, D.C., Ward, D.H., Solovyeva, D.V., Santos, E.S.A., Rakhimberdiev, E., Nol, E., Kwon, E., Brown, G.S., Gates, H.R., Johnson, J.A., van Gils, J.A., Hansen, J., Lamarre, J.-F., Rausch, J., Conklin, J.R., Liebezeit, J., Bêty, J., Lang, J., Alves, J.A., Fernández-Elipe, J., Exo, K.-M., Bollache, L., Bertellotti, M., Giroux, M.-A., van de Pol, M., Johnson, M., Boldenow, M.L., Valcu, M., Soloviev, M.Y., Sokolova, N., Senner, N.R., Lecomte, N., Meyer, N., Schmidt, N.M., Gilg, G., Smith, P.A., Machín, P., McGuire, R.L., Cerboncini, R.A.S., Ottvall, R., van Bemmelen, R.S.A., Swift, R.J., Saalfeld, S.T., Jamieson, S.E., Brown, S., Piersma, T., Albrecht, T., D’Amico, V., Lanctot, R.B., Kempenaers, B., Bulla, M., Reneerkens, J., Weiser, E.L., Sokolov, A., Taylor, A.R., Sittler, B., McCaffery, B.J., Ruthrauff, D.R., Catlin, D.H., Payer, D.C., Ward, D.H., Solovyeva, D.V., Santos, E.S.A., Rakhimberdiev, E., Nol, E., Kwon, E., Brown, G.S., Gates, H.R., Johnson, J.A., van Gils, J.A., Hansen, J., Lamarre, J.-F., Rausch, J., Conklin, J.R., Liebezeit, J., Bêty, J., Lang, J., Alves, J.A., Fernández-Elipe, J., Exo, K.-M., Bollache, L., Bertellotti, M., Giroux, M.-A., van de Pol, M., Johnson, M., Boldenow, M.L., Valcu, M., Soloviev, M.Y., Sokolova, N., Senner, N.R., Lecomte, N., Meyer, N., Schmidt, N.M., Gilg, G., Smith, P.A., Machín, P., McGuire, R.L., Cerboncini, R.A.S., Ottvall, R., van Bemmelen, R.S.A., Swift, R.J., Saalfeld, S.T., Jamieson, S.E., Brown, S., Piersma, T., Albrecht, T., D’Amico, V., Lanctot, R.B., and Kempenaers, B.

Published
2019

7. Plasma-sheath approximate solutions for planar and cylindrical anodes and probes

Author

Biblarz, O. and Brown, G.S.

Subjects
Plasma accelerators -- Research, Numerical analysis -- Evaluation, Physics
Abstract

The plasma-sheath approxinate solutions for planar and cylindrical anodes and probes were evaluated. The effect of non-dimensional parameter variations, such as the plasma temperature, on the sheath was investigated. An analytical method for the solution of lower-temperature plasmas was also formulated. The results of the approximate solutions were found to be in good agreement with those obtained using the analytical method.

Published
1993

8. Transforming the future: the comingimpact of CIS

Author

Brown, G.S., Fraser, John B., and Bendoraitis, Thomas M.

Subjects
Health care reform -- Planning, Medical informatics -- Planning, Psychiatric services -- Information management -- Planning, Business, Health care industry, Psychology and mental health, Company business planning, Company systems management, Planning, Information management
Abstract

Critics of managed mental health care have focused on the perceived negative impact of its methods on provider autonomy, the patient-professional relationship, and quality of care, which is allegedly sacrificed [...]

Published
1995

14. Estimating moose (Alces alces) occurrence and abundance from remotely derived environmental indicators

Author

Michaud, J -S, Coops, N.C., Andrew, M.E., Wulder, M.A., Brown, G.S., Rickbeil, G.J.M., Michaud, J -S, Coops, N.C., Andrew, M.E., Wulder, M.A., Brown, G.S., and Rickbeil, G.J.M.

Abstract

Understanding species–habitat relationships is critical for wildlife management, providing information on habitat requirements, distribution, and potential land use impacts. In this paper, we examined occurrence and abundance–habitat relationships for moose (Alces alces), a species of economic and ecological importance, across its range in southern and central Ontario. We (1) evaluated and tested competing hypotheses for predicting moose distribution and abundance, and (2) examined the ability of remotely derived environmental indicators to characterize and extrapolate moose habitat throughout the Ontario moose range. To do so, remotely sensed environmental indicators – including vegetation productivity calculated using the Dynamic Habitat Index (DHI), land cover, topography, snow cover, and natural and anthropogenic disturbances – were used to estimate moose occurrence and abundance derived from moose aerial survey data. A 2-step Hurdle model was used to accommodate for zero-inflated data, separately modeling moose occurrence and abundance in a common model framework. Our results indicate that remotely sensed indicators are able to estimate moose occurrence with a moderate degree of certainty; however, these environmental indicators did not successfully estimate moose abundance. The approach outlined in this paper provides a useful framework for hypothesis testing of remote sensing environmental drivers at broad scales, as well as for estimating moose occurrence at the regional level.

Published
2014

48. Evaluation of rayon swab surface sample collection method for Bacillus spores from nonporous surfaces.

Author

Brown, G.S., Betty, R.G., Brockmann, J. E., Lucero, D. A., Souza, C. A., Walsh, K. S., Boucher, R. M., Tezak, M. S., Wilson, M. C., Rudolph, T., Lindquist, H.D.A., and Martinez, K.F.

Subjects
*RAYON, *SURGICAL swabs, *BACTERIAL spores, *EXTRACTION (Chemistry), *STANDARD deviations, *SONICATION, *PUBLIC health, *DECONTAMINATION of bacillus anthracis, *SYNTHETIC textiles
Abstract

Aim: To evaluate US Centers for Disease Control and Prevention recommended swab surface sample collection method for recovery efficiency and limit of detection for powdered Bacillus spores from nonporous surfaces. Methods and Results: Stainless steel and painted wallboard surface coupons were seeded with dry aerosolized Bacillus atrophaeus spores and surface concentrations determined. The observed mean rayon swab recovery efficiency from stainless steel was 0·41 with a standard deviation (SD) of ±0·17 and for painted wallboard was 0·41 with an SD of ±0·23. Evaluation of a sonication extraction method for the rayon swabs produced a mean extraction efficiency of 0·76 with an SD of ±0·12. Swab recovery quantitative limits of detection were estimated at 25 colony forming units (CFU) per sample area for both stainless steel and painted wallboard. Conclusions: The swab sample collection method may be appropriate for small area sampling (10 –25 cm2) with a high agent concentration, but has limited value for large surface areas with a low agent concentration. The results of this study provide information necessary for the interpretation of swab environmental sample collection data, that is, positive swab samples are indicative of high surface concentrations and may imply a potential for exposure, whereas negative swab samples do not assure that organisms are absent from the surfaces sampled and may not assure the absence of the potential for exposure. Significance and Impact of the Study: It is critical from a public health perspective that the information obtained is accurate and reproducible. The consequence of an inappropriate public health response founded on information gathered using an ineffective or unreliable sample collection method has the potential for undesired social and economic impact. [ABSTRACT FROM AUTHOR]

Published
2007
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