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16 August 2011 On- and off-shelf diving effort of juvenile elephant seals from Península Valdés determined by light loggers
Elena Beatríz Eder, Mirtha Noemí Lewis, María Rosa Marín, Claudio Campagna
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Abstract

The shallow Patagonian Shelf off Península Valdés limits the dive depth of southern elephant seals (Mirounga leonina) to <100 m, an unusual circumstance for this deep-diving species. Beyond the shelf water depths of >1,000 m enable the seals to forage deeper and use the entire water column. We compared the diving pattern of 10 juveniles instrumented with light–temperature loggers to determine if diving effort, measured as dive durations longer than the estimated aerobic dive limit, differed between on-shelf and off-shelf waters. The productive Patagonian Shelf, an environment where juveniles showed lower diving effort, also was used commonly by older seals, which likely displaced juveniles off-shelf periodically, where they exhibited increased diving effort.

American Society of Mammalogists
Elena Beatríz Eder, Mirtha Noemí Lewis, María Rosa Marín, and Claudio Campagna "On- and off-shelf diving effort of juvenile elephant seals from Península Valdés determined by light loggers," Journal of Mammalogy 92(4), 811-818, (16 August 2011). https://doi.org/10.1644/10-MAMM-A-292.1
Received: 23 August 2010; Accepted: 1 February 2011; Published: 16 August 2011
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KEYWORDS
diving effort
light–temperature loggers
Mirounga leonina
Patagonian Shelf
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