Description Usage Arguments References See Also Examples
Improves bottom_delim_std
by defining a lower ledge (which implies
longer bottoms) but reducing the bottom phase to a more relevant period
(where specific behavior seems to indicate intensive foraging search). This
is achieved by selecting the period between the first and last step/wiggle
(see function wiggles
) deeper than the ledge.
1 | bottom_delim_halsey(time, depth = NULL, ledge = 0.5, vert_vel = 0.35)
|
time |
time readings, sorted in chronological order. |
depth |
depth readings, sorted in chronological order. |
ledge |
depth threshold, specified as a percentage which is compared to the maximum depth. 0.75 has been used for king pengins. For elephant seals: about 95 percent of prey catch attemps occur at depth greater than 50 percent of the maximum depth (default value 0.50). |
vert_vel |
A threshold used to define the steps. 0.35 m/s has been used for king pengins. |
Halsey, L.G., Bost, C.-A. & Handrich, Y. (2007) A thorough and quantified method for classifying seabird diving behaviour. Polar Biology, 30, 991-1004.
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