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Related Concept Videos

Functionalism01:11

Functionalism

William James, John Dewey, and Charles Sanders Peirce were instrumental in founding functional psychology, which draws heavily from Darwin's theory of evolution by natural selection. This theory suggests that individual traits, including behaviors, are adapted to their environments through natural selection. At the heart of functionalism is the concept of adaptation, meaning that a trait enhances an individual's chances of survival and reproduction.
James envisioned psychology's role as...
Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Functional Classification of Joints01:09

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...
Diversity of Protists I01:15

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Friedman Two-way Analysis of Variance by Ranks01:21

Friedman Two-way Analysis of Variance by Ranks

Friedman's Two-Way Analysis of Variance by Ranks is a nonparametric test designed to identify differences across multiple test attempts when traditional assumptions of normality and equal variances do not apply. Unlike conventional ANOVA, which requires normally distributed data with equal variances, Friedman's test is ideal for ordinal or non-normally distributed data, making it particularly useful for analyzing dependent samples, such as matched subjects over time or repeated measures from...
Per-Unit Sequence Models01:26

Per-Unit Sequence Models

An ideal Y-Y transformer, grounded through neutral impedances, displays per-unit sequence networks akin to those of a single-phase ideal transformer when subjected to balanced positive- or negative-sequence currents. These currents do not produce neutral currents, and their associated voltage drops.
Zero-sequence currents, which are identical in magnitude and phase, generate a neutral current, resulting in voltage drops across the neutral impedance and the low-voltage winding. If the...

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Updated: Jun 2, 2026

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
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Published on: December 7, 2021

A partial ordering approach for functional diversity.

Carlo Ricotta1, Laszlo Szeidl, Marco Moretti

  • 1University of Rome "La Sapienza", Department of Environmental Biology, Piazzale Aldo Moro. carlo.ricotta@uniroma1.it

Theoretical Population Biology
|April 23, 2011
PubMed
Summary

This study introduces a novel mathematical approach to ordering functional diversity indices, simplifying their comparison. This method helps standardize the assessment of species traits

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Area of Science:

  • Ecology
  • Biodiversity Science
  • Mathematical Biology

Background:

  • Functional diversity measures how species' traits influence ecosystem processes.
  • Numerous functional diversity indices exist, driven by varied ecological objectives.
  • The proliferation of indices complicates ecological assessments and comparisons.

Purpose of the Study:

  • To propose a fundamental mathematical approach for ordering abundance-weighted functional diversity measures.
  • To introduce an intrinsic ordering method analogous to Lorenz curves for evenness measures.
  • To discuss the compatibility of existing functional diversity indices with the proposed ordering.

Main Methods:

  • Development of an intrinsic ordering approach for abundance-weighted functional diversity.
  • Application of a mathematical framework similar to Lorenz curves.
  • Analysis of the behavior of existing functional diversity indices relative to the proposed ordering.

Main Results:

  • A novel mathematical framework for ordering functional diversity indices has been established.
  • The proposed intrinsic ordering provides a standardized method for comparing functional diversity measures.
  • The study identifies functional diversity indices whose behavior aligns with the new ordering principle.

Conclusions:

  • The proposed intrinsic ordering approach offers a more fundamental and unified perspective on functional diversity.
  • This method can help resolve the complexity arising from the multitude of existing functional diversity indices.
  • Standardizing the assessment of functional diversity through this ordering enhances ecological research and application.