163,260 research outputs found
Light access and leaf trait variation within and among tree species across diverse mixtures within a common garden
No full textLeaf trait measurements alongside estimates of light access for 2615 leaves from 12 common temperate-boreal tree species grown in diverse mixtures within a common garden.This dataset includes trait measurements for 2615 leaves of common temperate-boreal tree species alongside estimates of their light access. Trait values affect how plants function, with consequences that propagate through scales of ecological organization to affect ecosystem function. However, the pathway connecting trait expression to ecosystem function is complicated by feedbacks: trait expression may vary within species in response to community diversity, and trait expression also determines a community’s functional diversity. In this study, we quantify the extent to which light access – which past studies suggest affects trait expression and differs as a result of interactions among plants – differs consistently with community diversity and explains intraspecific trait variation in trees. In a common garden, trees of five angiosperm and seven gymnosperm species were planted to form 37 communities ranging widely in species and functional diversity whereby confounding environmental variation was minimized. We sampled leaves of each species to characterize intraspecific variation within crowns, among trees within communities, and among communities in three traits – leaf size, specific leaf area and nitrogen concentration – and estimated each leaf’s access to light.The University of Minnesota (College of Biological Sciences, College of Food and Natural Resources, Institute on the Environment, and Graduate School), the Canada Research Chair program, and an International Fulbright Science and Technology Award financially supported the collection of the data.Williams, Laura J; Cavender-Bares, Jeannine; Reich, Peter B; Paquette, Alain; Messier, Christian. (2019). Light access and leaf trait variation within and among tree species across diverse mixtures within a common garden. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/jt9r-tf03
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
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Rotational Velocities in NGC 6475 (Messier 7)
No full textFifty-five spectra at 39 Å/mm are used to determine rotational velocities for 25 stars in the galactic cluster Messier 7 (NGC 675). Compared to field stars, the brighter (-1.4 < Mᵥ < +1.0) cluster stars have very low rotational velocities ( ≈ 91 km /sec), whereas the fainter ( +1.2 < Mᵥ < +2.3) stars have a rather high of about 196 km /sec. The sample is probably incomplete at the fainter magnitude ranges. The frequency of spectroscopic binaries among the earlier type stars is believed to be high, but the of the brighter group remains low even after removal of known binaries. Three Ap or composite stars are found. The rotational velocity characteristics of Messier 7 are compared with those of other clusters. Low for brighter cluster stars is not a unique phenomenon.Digitized from bound copy held at the Parker Library, Steward Observatory
Data and code for remote spectral detection of biodiversity effects on forest biomass
No full textQuantifying how biodiversity affects ecosystem functions through time over large spatial extents is needed to meet global biodiversity goals yet is infeasible with field-based approaches alone. Imaging spectroscopy is a tool with potential to help address this challenge. In this study, we demonstrated a spectral approach to assess biodiversity effects in young forests that provides insight into its underlying drivers and could potentially be applied at large spatial scales. Using airborne imaging (NASA AVIRIS-NG) of a tree diversity experiment (IDENT-Cloquet in Cloquet, MN), spectral differences among plots enabled us to quantify net biodiversity effects on stem biomass and canopy nitrogen. In this repository, we present the spectral data and field data along with spectral model coefficients and example code for fitting and applying spectral models to calculate spectral biodiversity effects.The project was funded by a National Science Foundation and National Aeronautic and Space Administration grant awarded to Jeannine Cavender-Bares (DEB-1342872) and Philip A. Townsend (DEB-1342778) through the Dimensions of Biodiversity program.Williams, Laura J; Cavender-Bares, Jeannine; Townsend, Philip A; Couture, John J; Wang, Zhihui; Stefanski, Artur; Messier, Christian; Reich, Peter B. (2020). Data and code for remote spectral detection of biodiversity effects on forest biomass. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/s7pf-am91
Is Messier 74 a barred spiral galaxy?
No full textWe have obtained ground-based I, J and K
band images of the spiral
galaxy, Messier 74 (NGC 628).
This galaxy has been shown to possess a circumnuclear ring
of star formation from both near-infrared spectroscopy of CO absorption and
sub-millimetre imaging of CO emission. Circumnuclear rings of star formation
are believed to exist only as a result of a bar potential. In this paper we
show evidence for a weak oval distortion in the centre of M 74. We use the
results of Combes & Gerin (1985) to suggest that this weak oval potential
is responsible for the circumnuclear ring of star formation observed in M 74
Murder on the mountain: author talk with Peter J. Wosh
No full textAuthor talk by Peter J. Wosh on May 5th, 2022, on his book, "Murder on the Mountain: crime, passion, and punishment in gilded age New Jersey.
Mr. Melvin J. Collier, RWWL AUC, June 2011
No full textThis video is a conversation with Mr. Melvin J. Collier. Mr. Collier talks about his book, "From Mississippi to Africa: A Journey of Discovery". Daniel Le, AUC Woodruff Library, is the interviewer
Cause and effects of the massive star formation in Messier 8 East
No full textContext. Messier 8 (M8), one of the brightest H I
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