Movements and Habitat use of Dwarf and Pygmy Sperm Whales using Remotely-Deployed LIMPET Satellite Tags

Abstract

Abstract : Dwarf (Kogia sima) and pygmy (K. breviceps) sperm whales are among the least known species of odontocetes, despite their distribution in oceanic waters world-wide. There is some evidence that both species may be at least occasionally impacted by Navy sonar activity (Hohn et al. 2006; Weilgart 2007). The long-term goals of this research are to reduce uncertainty regarding movements and habitat use of these species in Hawaiian waters, an area where these species are exposed to Navy activities. The objectives of this research are to assess site fidelity, movements, and habitat use of dwarf and pygmy sperm whales in Hawai i over periods of weeks to months, through the remote deployment of LIMPET satellite tags. Knowledge of site fidelity and movements among islands will allow for assessment of the likelihood of repeat exposure to anthropogenic activities, as well as determination of whether individuals are part of smaller island-associated populations or open-ocean populations. The results will also help in identifying preferred habitats where overlap with anthropogenic activities is most likely to exist.