Marine Wildlife Behavior Database
Metadata
This section includes fields that describe the rate of travel (change in depth over change in time) in the vertical plane during the ascent and descent portions of a dive. The vertical rate is equivalent to the ascent (surfacing) or descent (diving) rate, and may also be referred to as the vertical speed or the vertical velocity (Houser, 2006; Johnson and Tyack, 2003).
 Minimum Ascent Rate
VR_MinAscentRate(m/s): The minimum ascent rate, change in depth divided by change in time (meters/second).
 Maximum Ascent Rate
VR_MaxAscentRate(m/s): The maximum ascent rate, change in depth divided by change in time (meters/second).
 Mean Ascent Rate
VR_MeanAscentRate(m/s): The mean or average ascent rate, change in depth divided by change in time (meters/second).
 Median Ascent Rate
VR_MedianAscentRate(m/s): The middle value in the distribution of the ascent rate, change in depth divided by change in time (meters/second). If there is an even number of ascent rate values, it is the average of the two middle values.
 Mode Ascent Rate
VR_ModeAscentRate(m/s): The most common ascent rate value; in the frequency distribution, the ascent rate with the greatest number of frequencies (meters/second).
 Ascent Rate Standard Deviation
VR_AscentRateStdDev: To express the degree of dispersion in the ascent rate data, the standard deviation (square root of the variance) should be entered (meters/second).
 Gamma Distribution Alpha
VR_AscentGammaDistAlpha: The shape parameter of the gamma distribution of ascent rates, determined by submitting data and fitting the raw data in a statistical package.
 Gamma Distribution Beta
VR_AscentGammaDistBeta: The rate parameter, equal to 1/Θ (the scale parameter), of the gamma distribution of ascent rates, determined by submitting data and fitting the raw data in a statistical package.
 Minimum Descent Rate
VR_MinDescentRate(m/s): The minimum descent rate, change in depth divided by change in time (meters/second).
 Maximum Descent Rate
VR_MaxDescentRate(m/s): The maximum descent rate, change in depth divided by change in time (meters/second).
 Mean Descent Rate
VR_MeanDescentRate(m/s): The mean or average descent rate, change in depth divided by change in time (meters/second).
 Median Descent Rate
VR_MedianDescentRate(m/s): The middle value in the distribution of the descent rate, change in depth divided by change in time (meters/second). If there is an even number of descent rate values, it is the average of the two middle values.
 Mode Descent Rate
VR_ModeDescentRate(m/s): The most common descent rate value; in the frequency distribution, the descent rate with the greatest number of frequencies (meters/second).
 Descent Rate Standard Deviation
VR_DescentRateStdDev: To express the degree of dispersion in the descent rate data, the standard deviation (square root of the variance) should be entered (meters/second).
 Descent Gamma Distribution Alpha
VR_DescentGammaDistAlpha: The shape parameter of the gamma distribution of descent rates, determined by submitting data and fitting the raw data in a statistical package.
 Descent Gamma Distribution Beta
VR_DescentGammaDistBeta: The rate parameter, equal to 1/Θ (the scale parameter), of the gamma distribution of descent rates, determined by submitting data and fitting the raw data in a statistical package.
 Comments
VR_Comments: Freeform field to note complications with data entry, information to review at a later date, etc.
