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Submit a Project
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Submit a Project or Conservation Activity that you wish to share with the Tennessee River Basin community. To submit a project, you must first be a member of the Web Portal and then logged in to the site. To add a project or activity, first login, then click on Add New in the green toolbar at the top and then click on Project. Fill out all the appropriate fields and click Save. Your content will then be placed in a Pending Publication Folder to be reviewed and published. If you are not a member and still wish to share your project or activity contact Gillian Bee: gilliab@g.clemson.edu
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Projects
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Subtropical to boreal convergence of tree-leaf temperatures
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The oxygen isotope ratio (d18O) of cellulose is thought to provide a record of ambient temperature and relative humidity during per- iods of carbon assimilation1,2. Here we introduce a method to resolve tree-canopy leaf temperature with the use of d18O of cellulose in 39 tree species. We show a remarkably constant leaf temperature of 21.4 6 2.2 6C across 506 of latitude, from subtropical to boreal biomes. This means that when carbon assimilation is maximal, the physiological and morphological properties of tree branches serve to raise leaf temperature above air temperature to a much greater extent in more northern latitudes. A main assumption underlying the use of d18O to reconstruct climate history is that the temperature and relative humidity of an actively photosynthesizing leaf are the same as those of the surrounding air3,4. Our data are contrary to that assumption and show that plant physiological ecology must be considered when reconstructing climate through isotope analysis. Furthermore, our results may explain why climate has only a modest effect on leaf economic traits5 in general.
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Resources
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Climate Science Documents
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Successful range-expanding plants experience less above-ground and below-ground enemy impact
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Many species are currently moving to higher latitudes and altitudes1–3. However, little is known about the factors that influence the future performance of range-expanding species in their new habitats. Here we show that range-expanding plant species from a riverine area were better defended against shoot and root enemies than were related native plant species growing in the same area. We grew fifteen plant species with and without non-coevolved polyphagous locusts and cosmopolitan, polyphagous aphids. Contrary to our expectations, the locusts performed more poorly on the range-expanding plant species than on the congeneric native plant species, whereas the aphids showed no difference. The shoot herbivores reduced the biomass of the native plants more than they did that of the congeneric range expanders. Also, the range-expanding plants developed fewer pathogenic effects4,5 in their root-zone soil than did the related native species. Current predictions forecast biodiversity loss due to limitations in the ability of species to adjust to climate warming conditions in their range 6–8. Our results strongly suggest that the plants that shift ranges towards higher latitudes and altitudes may include potential invaders, as the successful range expanders may experience less control by above-ground or below- ground enemies than the natives.
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Resources
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Climate Science Documents
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Suloway Illinois Mussels.pdf
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Resources
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TRB Library
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STE-TAN
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Suloway Kankakee River.pdf
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Resources
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TRB Library
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STE-TAN
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Supplemental planting for quail
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Food plots can be helpful for bobwhites but only if they're done properly. Marion Barnes of Clemson Extension talks about what to plant, where to plant it and when to put it in the ground to get the most benefits.
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Training Resources
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Webinars and Instructional Videos
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Bobwhite Quail Seminar Series
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Support
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Support
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Suppressing Impacts of the Amazonian Deforestation by the Global Circulation Change
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Analyzing the Global Historical Climatology Network, outgoing longwave radiation, and NCEP–NCAR reanalysis data over the Amazon Basin, the authors find a clear interdecadal increasing trend over the past four decades in both rainfall and intensity of the hydrological cycle. These interdecadal variations are a result of the interdecadal change of the global divergent circulation. On the contrary, the impact of the Amazon deforestation as evaluated by all numerical studies has found a reduction of rainfall and evaporation, and an increase of temperature in the Amazon Basin extending its dry season. Evidently, the interdecadal trend of the basin’s hydrological cycle revealed from observations functions in a course opposite to the deforestation scenario. Results of this study suggest that future studies analyzing the impact of the basin-scale deforestation on the regional hydrological cycle and climate should be reassessed with multidecade numerical simulations including both schemes handling the land-surface processes and the mechanism generating proper interdecadal variation of the global divergent circulation.
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Resources
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Climate Science Documents
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Swamp pink (Helonias bullata)
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swamp pink_kerry Wixted_2010.jpg
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Vulnerability
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Climate Change Vulnerability
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Climate Change Vulnerability Assessment Photo Gallery
