California Gnatcatchers

Effects of Helicopter Noise on California Gnatcatchers Our laboratory conducted a five‐year study on the potential effects of helicopter noise on the reproductive success of the coastal California gnatcatcher (Polioptila californica californica) on Marine Corps Air...

Kit Fox

Kit Fox Response to Low Altitude Aircraft Four kit foxes were captured south of Gila Bend, Arizona, in an area not overflown by aircraft. Hearing thresholds were measured  with a San Diego Instruments Startle Recording System. Shaped 200‐ms tone bursts ranging from...

Antarctic Fur Seals

Antarctic Fur Seals on South Shetland Island A survey of Antarctic fur seals (Arctocephalus gazella) in the South Shetland Islands, Antarctica, during the 1986/87 austral summer indicated that this species is continuing its population recovery and recolonization of...

Ross Seals

Diving Patterns of Ross Seals In January 1987 we documented the diving patterns of a female Ross seal (Ommatophoca rossii) in the marginal pack-ice zone near the eastern coast of the Antarctic Peninsula for 2 days using a microprocessor-based time-depth recorder. The...

Crabeater Seals

Weddell Sea crabeater seals Time-depth recorders were used to study the diving and haulout behavior of six crabeater seals in the marginal ice edge zone of the Weddell Sea during March 1986. Haulout patterns revealed the seals’ clear preference for diving during...