Light data from the foraging trips of the Southern elephant seal.
ElephantSeal1 A data frame with 3 columns.  The
columns represent
| time | times of measurement | 
| light | (log) light values | 
| segment | integer indicating sequence of twilight periods | 
ElephantSeal2 This tag is similar to ElephantSeal1
but also has columns
| depth | depth in the water column in metres (positive) | 
| temp | temperature in the water column in degrees celcius | 
ElephantSeal1calib and ElephantSealcalib2 A data
frame with 2 columns.  The columns represent
| zenith | zenith values | 
| light | (log) light values | 
Light intensity measurements over time from an archival tag on a
Southern elephant seal (Mirounga leonina).  The seal was
tagged at the isthmus on Macquarie Island (158.950E, 54.5S), with
data from a time-depth-recorder (Mk9 TDR; Wildlife Computers,
Seattle, WA, USA).  These tags provides regular time series of
measurements of depth, water temperature, and ambient light
level. The original data for ElephantSeal1 were processed
to remove values at depths greater than 15m and to classify
periods of twilight. The data for ElephantSeal2 have also
been processed for twilight periods. The seals makes one single
foraging trip, returning to the isthmus where they were tagged.
Data recorded while the seal is at the isthmus are used for
calibration (ElephantSeal1calib).
These data supplied courtesy of Mark Hindell, Institute of Marine
and Antarctic Studies, University of
Tasmania. ElephantSeal1 is B362_99 and ElephantSeal2
is C699_02
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