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20 results on '"Maguire, Andrew J."'

3. The biological basis for using optical signals to track evergreen needleleaf photosynthesis

Author

Pierrat, Zoe Amie, primary, Magney, Troy S, additional, Cheng, Rui, additional, Maguire, Andrew J, additional, Wong, Christopher Y S, additional, Nehemy, Magali F, additional, Rao, Mukund, additional, Nelson, Sara E, additional, Williams, Anneka F, additional, Grosvenor, Jeremy A Hoyne, additional, Smith, Kenneth R, additional, Reblin, Jaret S, additional, Stutz, Jochen, additional, Richardson, Andrew D, additional, Logan, Barry A, additional, and Bowling, David R, additional

Published
2024
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10. Remote Sensing of Tundra Ecosystems Using High Spectral Resolution Reflectance: Opportunities and Challenges

Author

Nelson, Peter R., primary, Maguire, Andrew J., additional, Pierrat, Zoe, additional, Orcutt, Erica L., additional, Yang, Dedi, additional, Serbin, Shawn, additional, Frost, Gerald V., additional, Macander, Matthew J., additional, Magney, Troy S., additional, Thompson, David R., additional, Wang, Jonathan A., additional, Oberbauer, Steven F., additional, Zesati, Sergio Vargas, additional, Davidson, Scott J., additional, Epstein, Howard E., additional, Unger, Steven, additional, Campbell, Petya K. E., additional, Carmon, Nimrod, additional, Velez‐Reyes, Miguel, additional, and Huemmrich, K. Fred, additional

Published
2022
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12. Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce.

Author

Schmiege, Stephanie C., Griffin, Kevin L., Boelman, Natalie T., Vierling, Lee A., Bruner, Sarah G., Min, Elizabeth, Maguire, Andrew J., Jensen, Johanna, and Eitel, Jan U. H.

Subjects
WHITE spruce, LEAF physiology, PHOTOSYNTHETIC rates, HAWTHORNS, LIGHT curves, TROPICAL forests, PRIMARY productivity (Biology)
Abstract

Light availability drives vertical canopy gradients in photosynthetic functioning and carbon (C) balance, yet patterns of variability in these gradients remain unclear. We measured light availability, photosynthetic CO2 and light response curves, foliar C, nitrogen (N) and pigment concentrations, and the photochemical reflectance index (PRI) on upper and lower canopy needles of white spruce trees (Picea glauca) at the species' northern and southern range extremes. We combined our photosynthetic data with previously published respiratory data to compare and contrast canopy C balance between latitudinal extremes. We found steep canopy gradients in irradiance, photosynthesis and leaf traits at the southern range limit, but a lack of variation across canopy positions at the northern range limit. Thus, unlike many tree species from tropical to mid‐latitude forests, high latitude trees may not require vertical gradients of metabolic activity to optimize photosynthetic C gain. Consequently, accounting for self‐shading is less critical for predicting gross primary productivity at northern relative to southern latitudes. Northern trees also had a significantly smaller net positive leaf C balance than southern trees suggesting that, regardless of canopy position, low photosynthetic rates coupled with high respiratory costs may ultimately constrain the northern range limit of this widely distributed boreal species. Summary statement: Canopy gradients in photosynthetic capacity of white spruce diminish at high compared to low latitudes. Low carbon balance in high latitude trees may determine the extent of northern treeline. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Remote Sensing of Tundra Ecosystems using High Spectral Resolution Reflectance: Opportunities and Challenges

Author

Nelson, Peter Ross, primary, Maguire, Andrew J, additional, Pierrat, Zoe, additional, Orcutt, Erica L, additional, Yang, Dedi (Daryl), additional, Serbin, Shawn Paul, additional, Frost, Gerald V., additional, Macander, Matthew J, additional, Magney, Troy Sehlin, additional, Thompson, David Ray, additional, Wang, Jonathan, additional, Oberbauer, Steven F., additional, Vargas Zesati, Sergio A, additional, Davidson, Scott J, additional, Epstein, Howard, additional, Unger, Steven, additional, Campbell, Petya K.E., additional, Carmon, Nimrod, additional, Velez-Reyes, Miguel, additional, and Huemmrich, K Fred, additional

Published
2021
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17. On the Functional Relationship Between Fluorescence and Photochemical Yields in Complex Evergreen Needleleaf Canopies

Author

Maguire, Andrew J., primary, Eitel, Jan U. H., additional, Griffin, Kevin L., additional, Magney, Troy S., additional, Long, Ryan A., additional, Vierling, Lee A., additional, Schmiege, Stephanie C., additional, Jennewein, Jyoti S., additional, Weygint, William A., additional, Boelman, Natalie T., additional, and Bruner, Sarah G., additional

Published
2020
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20. Appropriate Name

Author

MAGUIRE, ANDREW J.

Abstract

To the Editor.—The stimulating debate on the most appropriate name for our specialty, as evidenced in the September Archives (1980;106:521), has not only taken place in North America. For many years since the formation of the European Economic Community (EEC), or Common Market, medical specialists have endeavored to define their sphere of activity accurately to colleagues in the nine member countries.At first sight, the problems seemed even more fundamental than those occurring in the United States. In Britain and Ireland, the designation "ear, nose, and throat (ENT) surgeons" clearly delineated primary areas and included the operative part of the work. In France, however, for example, the term "otorhino-laryngologiste" did not even convey to both patients and colleagues that the specialty had a surgical aspect. The accuracy of even "ENT" in the British Isles can be questioned, as surgery of the external part of the nose, particularly relating to

Published
1981
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