Abstract
The objective of this study is to estimate the spatial density of leopard seals using data recorded with a single stationary passive acoustic recording system in the Bransfield Strait, Antarctica, between 2005 and 2007. The most prominent vocalization of the leopard seal—the low double trill (LDT)—is used as a proxy for the presence of the species in the vicinity of the recording system. Because of the stereotypic nature and high frequency of occurrence of the LDT, a long‐term spectrogram approach can be applied to the data sets to reliably detect the presence of the target species. Energy levels in the target frequency band (200–400 Hz) as derived by the long‐term spectrogram analysis are related to number of manually counted calls extracted for selected periods. A linear regression analysis showed that energy levels are highly correlated with the number of manually counted calls. The number of recorded calls per unit time is converted into number of vocalizing animals per unit time by applying published...
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