Chelonia Limited

  Cetacean Monitoring Systems

 

Species detection

The toothed whales include all dolphins, porpoises, orcas, beaked whales, sperm whales and pilot whales. All toothed cetaceans make echo-location clicks and in every case except the sperm whale these are almost certain to be detectable by C-PODs.

To date, PODs have been shown to detect the species listed below. More information on these species can be found on the Convention on Migratory Species web site.

  • Atlantic hump-backed Dolphins, Sousa teuszii
  • Atlantic white-beaked dolphin, Lagenorhynchus albirostris
  • Atlantic white-sided dolphin, Lagenorhynchus acutus
  • Australian snubfin dolphin, Orcaella heinsohni
  • Beluga, Delphinapterus leucas
  • Boto, Inia geoffrensis
  • Bottlenose dolphin, Tursiops truncatus and Tursiops aduncus
  • Burmeister's dolphin, Phocoena spinipinnis
  • Commerson's dolphin, Cephalorhynchus commersonii
  • Common dolphin, Delphinus delphis
  • Cuvier's beaked whale, Ziphius cavirostris
  • False Killer whale, Pseudorca crassidens
  • Franciscana (La Plata dolphin), Pontoporia blainvillei
  • Guiana dolphin, Sotalia guianensis
  • Harbour porpoise, Phocoena phocoena
  • Heaviside's dolphin, Cephalorhynchus heavisidii
  • Indo-Pacific humpback dolphin, Sousa chinensis
  • Long-finned pilot whale, Globicephala melas
  • Maui dolphin, Cephalorhynchus hectori maui (subspecies of Hector's dolphin)
  • Orca, Orcinus orca
  • Peale's dolphin, Lagenorhynchus australis
  • Risso's dolphin, Grampus griseus
  • Short-finned pilot whale, Globicephala macrorhynchus
  • Susu, Platanista gangetica
  • Tucuxi, Sotalia fluviatilis
  • Vaquita, Phocoena sinus

In quiet locations, over 40% of clicks identified in porpoise monitoring occur as click trains. Similar rates can be found from dolphins in such quiet locations as the Amazon. More typically, in dolphin monitoring, less than 5% of the clicks are in trains. This is because their clicks are less distinctive, so more non-cetacean clicks are logged at the maximum bandwidth required to include the cetacean clicks and because more echoes and multi-path duplicates of clicks are received from these louder animals.

The main energy in sperm whale, Physeter catodon, clicks is below the frequency range of the C-POD, and they may well not be detectable by C-PODs.