The Experts below are selected from a list of 1293570 Experts worldwide ranked by ideXlab platform
Monique E. Rocca - One of the best experts on this subject based on the ideXlab platform.
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temporal context affects the Observed Rate of climate driven range shifts in tree species
Global Ecology and Biogeography, 2015Co-Authors: Katherine M. Renwick, Monique E. RoccaAbstract:Aim Range shifts associated with 20th-century warming have been documented for a wide range of taxa, but many species are not migrating fast enough to keep pace with the rapidly changing climate. Tree species can experience particularly long time lags in their migration response, resulting in altered forest composition and potentially delaying the migration of other obligate species. Here we review potential causes of these time lags and develop a conceptual framework for understanding how migration timing affects the Observed Rate of change. Location Global forest ecosystems. Methods We synthesize evidence from present-day tree species migrations to determine how different migration constraints can delay tree species range shifts. Results The Rate of present-day tree migrations is frequently slower than expected, and many factors may contribute to Observed migration lags. Migration constraints can be overcome given the right combination of circumstances, resulting in episodic range shifts that create temporal variability in migration Rates. Given projected increases in forest disturbances and extreme climatic events, episodic range shifts are likely. Main conclusions Recent efforts to explain the slow Rate of tree migration have primarily focused on dispersal limitation and niche-based constraints such as competition and other biotic interactions. We argue that these constraints cannot be fully understood without considering the temporal context of tree migration. Attempts to forecast and manage future distribution shifts must consequently consider how migration timing may affect Observed patterns of change.
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Temporal context affects the Observed Rate of climate‐driven range shifts in tree species
Global Ecology and Biogeography, 2014Co-Authors: Katherine M. Renwick, Monique E. RoccaAbstract:Aim Range shifts associated with 20th-century warming have been documented for a wide range of taxa, but many species are not migrating fast enough to keep pace with the rapidly changing climate. Tree species can experience particularly long time lags in their migration response, resulting in altered forest composition and potentially delaying the migration of other obligate species. Here we review potential causes of these time lags and develop a conceptual framework for understanding how migration timing affects the Observed Rate of change. Location Global forest ecosystems. Methods We synthesize evidence from present-day tree species migrations to determine how different migration constraints can delay tree species range shifts. Results The Rate of present-day tree migrations is frequently slower than expected, and many factors may contribute to Observed migration lags. Migration constraints can be overcome given the right combination of circumstances, resulting in episodic range shifts that create temporal variability in migration Rates. Given projected increases in forest disturbances and extreme climatic events, episodic range shifts are likely. Main conclusions Recent efforts to explain the slow Rate of tree migration have primarily focused on dispersal limitation and niche-based constraints such as competition and other biotic interactions. We argue that these constraints cannot be fully understood without considering the temporal context of tree migration. Attempts to forecast and manage future distribution shifts must consequently consider how migration timing may affect Observed patterns of change.
Katherine M. Renwick - One of the best experts on this subject based on the ideXlab platform.
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temporal context affects the Observed Rate of climate driven range shifts in tree species
Global Ecology and Biogeography, 2015Co-Authors: Katherine M. Renwick, Monique E. RoccaAbstract:Aim Range shifts associated with 20th-century warming have been documented for a wide range of taxa, but many species are not migrating fast enough to keep pace with the rapidly changing climate. Tree species can experience particularly long time lags in their migration response, resulting in altered forest composition and potentially delaying the migration of other obligate species. Here we review potential causes of these time lags and develop a conceptual framework for understanding how migration timing affects the Observed Rate of change. Location Global forest ecosystems. Methods We synthesize evidence from present-day tree species migrations to determine how different migration constraints can delay tree species range shifts. Results The Rate of present-day tree migrations is frequently slower than expected, and many factors may contribute to Observed migration lags. Migration constraints can be overcome given the right combination of circumstances, resulting in episodic range shifts that create temporal variability in migration Rates. Given projected increases in forest disturbances and extreme climatic events, episodic range shifts are likely. Main conclusions Recent efforts to explain the slow Rate of tree migration have primarily focused on dispersal limitation and niche-based constraints such as competition and other biotic interactions. We argue that these constraints cannot be fully understood without considering the temporal context of tree migration. Attempts to forecast and manage future distribution shifts must consequently consider how migration timing may affect Observed patterns of change.
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Temporal context affects the Observed Rate of climate‐driven range shifts in tree species
Global Ecology and Biogeography, 2014Co-Authors: Katherine M. Renwick, Monique E. RoccaAbstract:Aim Range shifts associated with 20th-century warming have been documented for a wide range of taxa, but many species are not migrating fast enough to keep pace with the rapidly changing climate. Tree species can experience particularly long time lags in their migration response, resulting in altered forest composition and potentially delaying the migration of other obligate species. Here we review potential causes of these time lags and develop a conceptual framework for understanding how migration timing affects the Observed Rate of change. Location Global forest ecosystems. Methods We synthesize evidence from present-day tree species migrations to determine how different migration constraints can delay tree species range shifts. Results The Rate of present-day tree migrations is frequently slower than expected, and many factors may contribute to Observed migration lags. Migration constraints can be overcome given the right combination of circumstances, resulting in episodic range shifts that create temporal variability in migration Rates. Given projected increases in forest disturbances and extreme climatic events, episodic range shifts are likely. Main conclusions Recent efforts to explain the slow Rate of tree migration have primarily focused on dispersal limitation and niche-based constraints such as competition and other biotic interactions. We argue that these constraints cannot be fully understood without considering the temporal context of tree migration. Attempts to forecast and manage future distribution shifts must consequently consider how migration timing may affect Observed patterns of change.
Thomas C. Bruice - One of the best experts on this subject based on the ideXlab platform.
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Is strong hydrogen bonding in the transition state enough to account for the Observed Rate acceleration in a mutant of papain
Proceedings of the National Academy of Sciences of the United States of America, 1997Co-Authors: Ya-jun Zheng, Thomas C. BruiceAbstract:Nitriles are good inhibitors for the cysteine protease papain. However, a single amino acid mutation (Gln-19 → Glu-19) in the active site makes the mutant enzyme a good catalyst for nitrile hydrolysis. A theoretical approach was used to examine the differential transition state stabilization in the papain mutant relative to the wild-type enzyme. Based on this study, we concluded that strong hydrogen bonding in the transition state is responsible for the Observed Rate enhancement of 4 × 105.
Robert J. Currier - One of the best experts on this subject based on the ideXlab platform.
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Observed Rate of Down Syndrome in Twin Pregnancies.
Obstetrics and gynecology, 2016Co-Authors: Teresa N. Sparks, Mary E. Norton, Monica Flessel, Sara Goldman, Robert J. CurrierAbstract:OBJECTIVE:To evaluate the Observed incidence of Down syndrome in twins compared with that expected based on maternal age–matched singletons, which is the current clinical approach.METHODS:This was a retrospective review of California Prenatal Screening Program participants with expected delivery dat
Manjari Bagchi - One of the best experts on this subject based on the ideXlab platform.
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Dynamical Effects in the Observed Rate of Change of the Orbital and the Spin Periods of Radio Pulsars: Improvement in the Method of Estimation and Its Implications
The Astrophysical Journal, 2018Co-Authors: Dhruv Pathak, Manjari BagchiAbstract:The Observed values of the Rate of change of the orbital and the spin periods of pulsars are affected by different dynamical effects, for example, the line-of-sight acceleration and the proper motion of the pulsar relative to the sun. We explore these dynamical effects thoroughly and point out the drawbacks of popular methods. We introduce a package, `GalDynPsr', that evaluates different dynamical effects following traditional as well as improved methods based on the model of the Galactic potential provided in a publicly available package called `galpy'. We argue that the improved methods introduced in this paper should be used for pulsars located 1 kpc or farther away from the solar system, especially when precise values of the Rate of change of the periods are required, e.g., while placing limits on alternative theories of gravity, calculating the spin-down limit of the continuous gravitational waves emitted from a rotationally deformed neutron star, understanding pulsar `death-line', etc. GalDynPsr is available online and open for contributions.
