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Ordination or gradient analysis, in multivariate analysis, is a method complementary to data clustering, and used mainly in exploratory data analysis (rather than in hypothesis testing). In contrast to cluster analysis, ordination orders quantities in a (usually lower-dimensional) latent space. In the ordination space, quantities that are near ...
The loss-of-strength gradient (LSG) is a military concept devised by Kenneth E. Boulding in his 1962 book Conflict and Defense: A General Theory. He argued the amount of a nation's military power that could be brought to bear in any part of the world depended on geographic distance. The loss of strength gradient demonstrated graphically that ...
An extensive meta-analysis of nearly 600 latitudinal gradients from published literature tested the generality of the latitudinal diversity gradient across different organismal, habitat and regional characteristics. [1] The results showed that the latitudinal gradient occurs in marine, terrestrial, and freshwater ecosystems, in both hemispheres ...
With elevated regions most intensely feeling the effects of climate change and these effects being linked to increased species diversity in impacted regions, this is a key consideration in prioritizing habitats for conservation efforts. [3] At an ecotone, species abundances change relatively quickly compared to the environmental gradient.
A 2019 meta-analysis found no positive effect of sugar consumption on mood but did find an association with lower alertness and increased fatigue within an hour of consumption, known as a sugar crash. [354] Sugar can however lead to jump in blood sugar levels, causing temporary hyperactivity even if it does not cause clinical hyperactivity. [355]
[1] [5] The quadratic regression (γ) is the selection gradient, ω is the fitness of a trait value z, and α is the y-intercept of the fitness function. Here, individuals with intermediate trait values may have the highest fitness (stabilizing selection) or those with extreme trait values may have the highest fitness (disruptive selection).
The book received a positive review in The New York Times that wrote "Although the book unfolds according to a formula that has become familiar—story, study, lesson; rinse and repeat—the storytelling is so dramatic, the wielding of data so deft and the lessons so strikingly framed that it's never less than a pleasure to read". [5]
Stake. Gradient maps are both at the center and at the basic level of map making on Wikipedia. A simple blank map and fill with color tool are needed. To continue to build a coherent Wikipedia display, this page suggests the most suitable SVG source files together with a blue-based color ramps from academic, screen friendly, print friendly, and color-blind friendly ColorBrewer2 by cartography ...