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- Climate Solutions (11)
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- Aphaenogaster (1)
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- Heat shock proteins (1)
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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
Influence Of Topography And Human Activity On Apparent In Situ 10be-Derived Erosion Rates In Yunnan, Sw China, Amanda H. Schmidt, Thomas B. Neilson, Paul R. Bierman, Dylan H. Rood, William B. Ouimet, Veronica Sosa Gonzalez
Influence Of Topography And Human Activity On Apparent In Situ 10be-Derived Erosion Rates In Yunnan, Sw China, Amanda H. Schmidt, Thomas B. Neilson, Paul R. Bierman, Dylan H. Rood, William B. Ouimet, Veronica Sosa Gonzalez
College of Arts and Sciences Faculty Publications
In order to understand better if and where erosion rates calculated using in situ 10Be are affected by contemporary changes in land use and attendant deep regolith erosion, we calculated erosion rates using measurements of in situ 10Be in quartz from 52 samples of river sediment collected from three tributaries of the Mekong River (median basin areaD46.5 km2). Erosion rates range from 12 to 209mm kyr-1 with an area-weighted mean of 117±49mm kyr-1 (1 standard deviation) and median of 74mm kyr-1.We observed a decrease in the relative influence of human activity from our steepest and least altered watershed in the …
A Stochastic Model For Landscape Patterns Of Biodiversity, Jayme A. Prevedello, Nicholas J. Gotelli, Jean Paul Metzger
A Stochastic Model For Landscape Patterns Of Biodiversity, Jayme A. Prevedello, Nicholas J. Gotelli, Jean Paul Metzger
College of Arts and Sciences Faculty Publications
Many factors have been proposed to affect biodiversity patterns across landscapes, including patch area, patch isolation, edge distances, and matrix quality, but existing models emphasize only one or two of these factors at a time. Here we introduce a synthetic but simple individual-based model that generates realistic patterns of species richness and density as a function of landscape structure. In this model, we simulated the stochastic placement of home ranges in landscapes, thus combining features of existing random placement and mid-domain effect models. As such, the model allows investigation of whether and how geometric constraints on home range placement of …
Climatic Warming Destabilizes Forest Ant Communities, Sarah E. Diamond, Lauren M. Nichols, Shannon L. Pelini, Clint A. Penick, Grace W. Barber, Sara Helms Cahan, Robert R. Dunn, Aaron M. Ellison, Nathan J. Sanders, Nicholas J. Gotelli
Climatic Warming Destabilizes Forest Ant Communities, Sarah E. Diamond, Lauren M. Nichols, Shannon L. Pelini, Clint A. Penick, Grace W. Barber, Sara Helms Cahan, Robert R. Dunn, Aaron M. Ellison, Nathan J. Sanders, Nicholas J. Gotelli
College of Arts and Sciences Faculty Publications
How will ecological communities change in response to climate warming? Direct effects of temperature and indirect cascading effects of species interactions are already altering the structure of local communities, but the dynamics of community change are still poorly understood. We explore the cumulative effects of warming on the dynamics and turnover of forest ant communities that were warmed as part of a 5-year climate manipulation experiment at two sites in eastern North America. At the community level, warming consistently increased occupancy of nests and decreased extinction and nest abandonment. This consistency was largely driven by strong responses of a subset …
Variation Of Organic Matter Quantity And Quality In Streams At Critical Zone Observatory Watersheds, Matthew P. Miller, Elizabeth W. Boyer, Diane M. Mcknight, Michael G. Brown, Rachel S. Gabor, Carolyn T. Hunsaker, Lidiia Iavorivska, Shreeram Inamdar, Dale W. Johnson, Louis A. Kaplan, Henry Lin, William H. Mcdowell, Julia N. Perdrial
Variation Of Organic Matter Quantity And Quality In Streams At Critical Zone Observatory Watersheds, Matthew P. Miller, Elizabeth W. Boyer, Diane M. Mcknight, Michael G. Brown, Rachel S. Gabor, Carolyn T. Hunsaker, Lidiia Iavorivska, Shreeram Inamdar, Dale W. Johnson, Louis A. Kaplan, Henry Lin, William H. Mcdowell, Julia N. Perdrial
College of Arts and Sciences Faculty Publications
The quantity and chemical composition of dissolved organic matter (DOM) in surface waters influence ecosystem processes and anthropogenic use of freshwater. However, despite the importance of understanding spatial and temporal patterns in DOM, measures of DOM quality are not routinely included as part of large-scale ecosystem monitoring programs and variations in analytical procedures can introduce artifacts. In this study, we used consistent sampling and analytical methods to meet the objective of defining variability in DOM quantity and quality and other measures of water quality in streamflow issuing from small forested watersheds located within five Critical Zone Observatory sites representing contrasting …
Zirconium-Catalyzed Alkene Hydrophosphination And Dehydrocoupling With An Air-Stable, Fluorescent Primary Phosphine, Christine A. Bange, Neil T. Mucha, Morgan E. Cousins, Abigail C. Gehsmann, Anna Singer, Taylor Truax, Lee J. Higham
Zirconium-Catalyzed Alkene Hydrophosphination And Dehydrocoupling With An Air-Stable, Fluorescent Primary Phosphine, Christine A. Bange, Neil T. Mucha, Morgan E. Cousins, Abigail C. Gehsmann, Anna Singer, Taylor Truax, Lee J. Higham
College of Arts and Sciences Faculty Publications
Zirconium-catalyzed alkene hydrophosphination and dehydrocoupling with an air-stable, fluorescent primary phosphine 8-[(4-phosphino)phenyl]-4,4-dimethyl-1,3,5,7-tetramethyl-2,6-diethyl- 4-bora-3a,4a-diaza-s-indacene furnishes fluorescent phosphine products. Hydrophosphination of the fluorescent phosphine produces products with a complete selectivity for the secondary product. A key intermediate in catalysis, a zirconium phosphido compound, was isolated.
Limited Role Of Character Displacement In The Coexistence Of Congeneric Anelosimus Spiders In A Madagascan Montane Forest, Ingi Agnarsson, Nicholas J. Gotelli, Diego Agostini, Matjaž Kuntner
Limited Role Of Character Displacement In The Coexistence Of Congeneric Anelosimus Spiders In A Madagascan Montane Forest, Ingi Agnarsson, Nicholas J. Gotelli, Diego Agostini, Matjaž Kuntner
College of Arts and Sciences Faculty Publications
Evolutionary and ecological theory predicts that closely related and similar species should coexist infrequently because speciation is more likely to occur allopatrically than sympatrically, and because co-occurring species with similar traits may compete for limited resources, leading to competitive exclusion or character displacement. Here we study the unusual coexistence of 10 similar congeneric species of Anelosimus spiders within a small forest fragment in Madagascar. We asked if these species radiated in sympatry or allopatry, and if there was evidence for local-scale character displacement in body size and other species-level traits. We sampled ∼ 350 colonies (6346 individuals) along a 2800 …
Challenges In Catalytic Hydrophosphination, Christine A. Bange, Rory Waterman
Challenges In Catalytic Hydrophosphination, Christine A. Bange, Rory Waterman
College of Arts and Sciences Faculty Publications
Despite significant advances, metal-catalyzed hydrophosphination has ample room for discovery, growth, and development. Many of the key successes in metal-catalyzed hydrophosphination over the last decade have indicated what is needed and what is yet to come. Reactivity that is absent from the literature also speaks to the challenges in catalytic hydrophosphination. This Concept article discusses and highlights recent developments that address the ongoing challenges, and identifies areas in metal-catalyzed hydrophosphination that are underdeveloped. Advances in product selectivity, catalyst design, and both unsaturated and phosphine substrates illustrate the ongoing development of the field. Like all catalytic transformations, the benefits are realized …
Species Interactions And Random Dispersal Rather Than Habitat Filtering Drive Community Assembly During Early Plant Succession, Werner Ulrich, Markus Klemens Zaplata, Susanne Winter, Wolfgang Schaaf, Anton Fischer, Santiago Soliveres, Nicholas J. Gotelli
Species Interactions And Random Dispersal Rather Than Habitat Filtering Drive Community Assembly During Early Plant Succession, Werner Ulrich, Markus Klemens Zaplata, Susanne Winter, Wolfgang Schaaf, Anton Fischer, Santiago Soliveres, Nicholas J. Gotelli
College of Arts and Sciences Faculty Publications
Theory on plant succession predicts a temporal increase in the complexity of spatial community structure and of competitive interactions: initially random occurrences of early colonising species shift towards spatially and competitively structured plant associations in later successional stages. Here we use long-term data on early plant succession in a German post mining area to disentangle the importance of random colonisation, habitat filtering, and competition on the temporal and spatial development of plant community structure. We used species co-occurrence analysis and a recently developed method for assessing competitive strength and hierarchies (transitive versus intransitive competitive orders) in multispecies communities. We found …
Thermal Reactionomes Reveal Divergent Responses To Thermal Extremes In Warm And Cool-Climate Ant Species, John Stanton-Geddes, Andrew Nguyen, Lacy Chick, James Vincent, Mahesh Vangala, Robert R. Dunn, Aaron M. Ellison, Nathan J. Sanders, Nicholas J. Gotelli, Sara Helms Cahan
Thermal Reactionomes Reveal Divergent Responses To Thermal Extremes In Warm And Cool-Climate Ant Species, John Stanton-Geddes, Andrew Nguyen, Lacy Chick, James Vincent, Mahesh Vangala, Robert R. Dunn, Aaron M. Ellison, Nathan J. Sanders, Nicholas J. Gotelli, Sara Helms Cahan
College of Arts and Sciences Faculty Publications
Background: The distributions of species and their responses to climate change are in part determined by their thermal tolerances. However, little is known about how thermal tolerance evolves. To test whether evolutionary extension of thermal limits is accomplished through enhanced cellular stress response (enhanced response), constitutively elevated expression of protective genes (genetic assimilation) or a shift from damage resistance to passive mechanisms of thermal stability (tolerance), we conducted an analysis of the reactionome: the reaction norm for all genes in an organism's transcriptome measured across an experimental gradient. We characterized thermal reactionomes of two common ant species in the eastern …
The Evolution Of Heat Shock Protein Sequences, Cis-Regulatory Elements, And Expression Profiles In The Eusocial Hymenoptera, Andrew D. Nguyen, Nicholas J. Gotelli, Sara Helms Cahan
The Evolution Of Heat Shock Protein Sequences, Cis-Regulatory Elements, And Expression Profiles In The Eusocial Hymenoptera, Andrew D. Nguyen, Nicholas J. Gotelli, Sara Helms Cahan
College of Arts and Sciences Faculty Publications
Background: The eusocial Hymenoptera have radiated across a wide range of thermal environments, exposing them to significant physiological stressors. We reconstructed the evolutionary history of three families of Heat Shock Proteins (Hsp90, Hsp70, Hsp40), the primary molecular chaperones protecting against thermal damage, across 12 Hymenopteran species and four other insect orders. We also predicted and tested for thermal inducibility of eight Hsps from the presence of cis-regulatory heat shock elements (HSEs). We tested whether Hsp induction patterns in ants were associated with different thermal environments. Results: We found evidence for duplications, losses, and cis-regulatory changes in two of the three …
Dating The Incision Of The Yangtze River Gorge At The First Bend Using Three-Nuclide Burial Ages, Devin Mcphillips, Gregory D. Hoke, Jing Liu-Zeng, Paul R. Bierman, Dylan H. Rood, Samuel Niedermann
Dating The Incision Of The Yangtze River Gorge At The First Bend Using Three-Nuclide Burial Ages, Devin Mcphillips, Gregory D. Hoke, Jing Liu-Zeng, Paul R. Bierman, Dylan H. Rood, Samuel Niedermann
College of Arts and Sciences Faculty Publications
Incision of the Yangtze River gorge is widely interpreted as evidence for lower crustal flow beneath the southeast margin of the Tibetan Plateau. Previous work focused on the onset of incision, but the duration of incision remains unknown. Here we present cosmogenic nuclide burial ages of sediments collected from caves on the walls of the gorge that show the gorge was incised ~1 km sometime between 18 and 9 Ma. Thereafter, incision slowed substantially. We resolve middle Miocene burial ages by using three nuclides and accounting for in situ muogenic production. This approach explains the absolute concentrations of 10Be, 26Al, …
Triamidoamine-Supported Zirconium: Hydrogen Activation, Lewis Acidity, And: Rac -Lactide Polymerization, Sarah E. Leshinski, Craig A. Wheaton, Hongsui Sun, Andrew J. Roering, Joseph M. Tanski, Daniel J. Fox, Paul G. Hayes
Triamidoamine-Supported Zirconium: Hydrogen Activation, Lewis Acidity, And: Rac -Lactide Polymerization, Sarah E. Leshinski, Craig A. Wheaton, Hongsui Sun, Andrew J. Roering, Joseph M. Tanski, Daniel J. Fox, Paul G. Hayes
College of Arts and Sciences Faculty Publications
Investigation of a triamidoamine-supported zirconium hydride intermediate, important to a range of catalytic reactions, revealed the potential Lewis acidity of [κ5-N,N,N,N,C-(Me3SiNCH2CH2)2NCH2CH2NSiMe2CH2]Zr (1). A preliminary study of 1 as a precursor for the polymerization of rac-lactide showed modest activity but indicated that five-coordinate zirconium complexes with tetra-N donor ligands may be an avenue for further development in group 4 metal lactide polymerization catalysis.