Concepts

Method to detect historical bottlenecks using ratio of number of alleles to range in allele sizes

Temperature coefficient measuring the rate of change of a biological process as a function of temperature

Comparison of divergence at neutral molecular markers (FST) to divergence at quantitative functional traits (QST) to determine whether natural selection or neutral genetic drift drives trait variation

Association index calculated as the ratio of observations of individuals a and b seen together over the sum of observations of them seen together plus times seen separately

Mean Conservation Concern Score for present species calculated by multiplying species abundance by Partners in Flight rankings

β-diversity metric used to quantify interaction turnover between successive weekly networks

Geometric mean of the ratio of allele frequency between consecutive generations (pt/pt-1)

Between-plot flowering-time diversity component representing differences in phenological timing among plots

Metric calculated to determine deviation from null mean nearest taxon distance, used to identify whether deterministic or stochastic processes shape community composition

The volume of surface and ground water consumed as a result of the production of a good, expressed as the reciprocal of economic water productivity

A dimensional ratio calculated from minimum bounding rectangles to quantify the shape characteristics of pond polygons

The difference between cash rents for irrigated versus non-irrigated land in the same area, used to estimate the value of water for irrigation

Standardized measure of abundance calculated as number of individuals caught per unit of sampling time or effort

Measures of inter-tree competition including relative spacing, larger neighbor volume, and neighborhood density calculated within specified neighborhoods

Number of existing links divided by the number of possible links, or C=L/S²

Statistical measure of the consistency or scatter in paleocurrent directions

Quantitative measure that sums multiple adversity measures experienced during early life to assess overall adversity burden

Rate of mass loss per day during hibernation, expressed as mg per gram body mass per day, used as measure of energetic efficiency

A measure of drift standardized by the benthic density of the source population, calculated as drift density divided by benthic density

Precipitation efficiency measure based on integrated vapor transport normalization to evaluate microphysical scheme performance

Measures outputs generated per unit of water used, computed as dollar value of crop marketings divided by consumptive use of water for irrigation

Proportional change in λs resulting from a proportional change in the mean or standard deviation of a single vital rate

Quantitative measure of the sensitivity of weathering rates to changes in atmospheric CO2, characterized by 1st and 2nd order components

Overall health and nutritional status of fish populations as indicated by relative weight and other bioindicators

Power law exponent y' related to fractal box counting dimension indicating degree of self-similarity

Proportion of successful fruits produced out of total crosses attempted