standardized selection differentials
standing crop index
Calculated by multiplying the percent cover by the thickness (cm) of the mat
storage-discharge sensitivity
The relationship between catchment water storage and discharge output, typically characterized by a power law relationship Q = aS^b
stratification ratio
Ratio of planar cross stratification to planar cross stratification plus horizontal stratification used to distinguish proximal from distal braided stream facies
stream order
streamflow flashiness
A measure of how quickly streamflow rises and falls relative to total streamflow, quantified using the Richards-Baker Flashiness Index
summation of stochasticities of variance
tag retention
The percentage of implanted tags that remain in place over time without loss
thermal breadth
Temperature range over which feeding rate is 80% of maximum rate, indicating thermal generalization
thermoregulatory performance index
Slope of post-flight thoracic temperature against ambient temperature, where slopes closer to zero indicate better thermoregulatory ability
traffic volume index
Weekly number of visitors used as a proxy for vehicle traffic volume on nearby roads
transit time
The elapsed time carbon atoms spend in the soil, characterizing the age structure of output flux from the soil
transmission rate
trophic transfer efficiency
The efficiency with which energy is transferred between trophic levels in food webs
turnover time
The average time required for dead wood to decompose, calculated as the inverse of the decay rate constant
value of information
The change in the animal's expectation of the state of the world after receiving stimulus information
variance inflation factor
vegetative overlap
Spatial overlap between plant canopies used as a proxy for microenvironment modification strength
vulnerability index
A quantitative measure of forest growth sensitivity to climate change based on correlations between historical growth and climate data