The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Robert E Ricklefs - One of the best experts on this subject based on the ideXlab platform.

  • taxon richness and climate in angiosperms is there a globally Consistent Relationship that precludes region effects
    The American Naturalist, 2004
    Co-Authors: Hong Qian, Robert E Ricklefs
    Abstract:

    Abstract: We comment on a recent paper by Francis and Currie that reports a globally Consistent Relationship between plant family diversity in large geographic grid cells and factors in the physical environment. This Relationship was interpreted as demonstrating local ecological determination of diversity, leaving little room for regional and historical effects. We suggest that using family richness to describe patterns of diversity reduces regional effects owing to the lower endemism of plants at the family compared with the species level. Regardless of the taxonomic level of analysis, we further point out that unless regional effects are tested explicitly, statistically significant differences in diversity between regions can be overlooked. Finally, even correlations between diversity and physical conditions of the environment can have primarily historical and evolutionary origins when lineages diversify within ecological zones of origin and spread more slowly to diverse environments. Thus, local ecolog...

  • Taxon richness and climate in angiosperms: is there a globally Consistent Relationship that precludes region effects?
    The American naturalist, 2004
    Co-Authors: Hong Qian, Robert E Ricklefs
    Abstract:

    We comment on a recent paper by Francis and Currie that reports a globally Consistent Relationship between plant family diversity in large geographic grid cells and factors in the physical environment. This Relationship was interpreted as demonstrating local ecological determination of diversity, leaving little room for regional and historical effects. We suggest that using family richness to describe patterns of diversity reduces regional effects owing to the lower endemism of plants at the family compared with the species level. Regardless of the taxonomic level of analysis, we further point out that unless regional effects are tested explicitly, statistically significant differences in diversity between regions can be overlooked. Finally, even correlations between diversity and physical conditions of the environment can have primarily historical and evolutionary origins when lineages diversify within ecological zones of origin and spread more slowly to diverse environments. Thus, local ecological determinism should not have primacy over evolutionary-historical explanations for patterns of diversity between or within regions. Ecologists must evaluate patterns in local diversity within historical and geographic, as well as ecological, contexts.

Willard E. Reitz - One of the best experts on this subject based on the ideXlab platform.

  • Respiratory changes at auditory and visual thresholds.
    Psychophysiology, 2008
    Co-Authors: Clyde L. Rousey, Willard E. Reitz
    Abstract:

    Length of respiratory cycles was monitored while Ss were presented with (1) auditory and (2) visual stimuli varying in intensity. The phenomenon of greatest slowing in respiration occurring at the S's auditory threshold was demonstrated. However, no Consistent Relationship was demonstrated between length of the respiratory cycle and visual threshold.

Lonnie W Aarssen - One of the best experts on this subject based on the ideXlab platform.

  • species evenness not richness has a Consistent Relationship with productivity in old field vegetation
    Community Ecology, 2003
    Co-Authors: Robert A Laird, Jason Pither, Lonnie W Aarssen
    Abstract:

    The Relationship between productivity and species diversity was investigated at the quadrat level for three old-field plant communities that varied in time since the last major disturbance from cultivation. A positive Relationship between productivity (estimated by above-ground dry biomass) and the species richness component of diversity was detected only for quadrats from the most recently disturbed community. The communities that experienced longer post-disturbance time showed no significant Relationship between productivity and species richness. Quadrat productivity, however, was negatively related to the species evenness component of diversity in all three communities, i.e., regardless of time since disturbance. Furthermore, analyses of covariance using log biomass, species richness and species evenness as response variables, log soil nitrate concentration as a covariate and time since disturbance as a factor revealed that residual log biomass was significantly negatively correlated with residual spec...

Hong Qian - One of the best experts on this subject based on the ideXlab platform.

  • taxon richness and climate in angiosperms is there a globally Consistent Relationship that precludes region effects
    The American Naturalist, 2004
    Co-Authors: Hong Qian, Robert E Ricklefs
    Abstract:

    Abstract: We comment on a recent paper by Francis and Currie that reports a globally Consistent Relationship between plant family diversity in large geographic grid cells and factors in the physical environment. This Relationship was interpreted as demonstrating local ecological determination of diversity, leaving little room for regional and historical effects. We suggest that using family richness to describe patterns of diversity reduces regional effects owing to the lower endemism of plants at the family compared with the species level. Regardless of the taxonomic level of analysis, we further point out that unless regional effects are tested explicitly, statistically significant differences in diversity between regions can be overlooked. Finally, even correlations between diversity and physical conditions of the environment can have primarily historical and evolutionary origins when lineages diversify within ecological zones of origin and spread more slowly to diverse environments. Thus, local ecolog...

  • Taxon richness and climate in angiosperms: is there a globally Consistent Relationship that precludes region effects?
    The American naturalist, 2004
    Co-Authors: Hong Qian, Robert E Ricklefs
    Abstract:

    We comment on a recent paper by Francis and Currie that reports a globally Consistent Relationship between plant family diversity in large geographic grid cells and factors in the physical environment. This Relationship was interpreted as demonstrating local ecological determination of diversity, leaving little room for regional and historical effects. We suggest that using family richness to describe patterns of diversity reduces regional effects owing to the lower endemism of plants at the family compared with the species level. Regardless of the taxonomic level of analysis, we further point out that unless regional effects are tested explicitly, statistically significant differences in diversity between regions can be overlooked. Finally, even correlations between diversity and physical conditions of the environment can have primarily historical and evolutionary origins when lineages diversify within ecological zones of origin and spread more slowly to diverse environments. Thus, local ecological determinism should not have primacy over evolutionary-historical explanations for patterns of diversity between or within regions. Ecologists must evaluate patterns in local diversity within historical and geographic, as well as ecological, contexts.

Z R Wang - One of the best experts on this subject based on the ideXlab platform.

  • a Consistent Relationship between the stress and strain components and its application for analyzing the plane stress forming process
    Journal of Materials Processing Technology, 1995
    Co-Authors: Z R Wang
    Abstract:

    Abstract An important problem in metal forming is the final variation of the shape and the size of blank/billet after deformation. However, it is very difficult to make a quantitative calculation of the total deformation by the Levy—Mises equation expressed with the components of deviator and strain increments. The author has modified the calculation into a form of qualitative description called the Consistent Relationship between the stress- and strain-components, on the basis of the Levy—Mises equation for the condition of non-proportional loading. As the examples of its application, the tendency of the size-variation of the workpiece plane-stress forming processes is given also.