CETACEA Biology & Ecology Mammalogy – EEOB 625 1 March 2004.

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Presentation transcript:

CETACEA Biology & Ecology Mammalogy – EEOB March 2004

Swimming, Diving & Respiration Swimming efficiency & lamilar flow Diving and hydrostatic pressure ( lbs/sq.inch) Non-compressible bones & rigid upper airways Collapsing lungs prevent damage & uptake of N 2 Cardio pulmonary adaptations 2 or 3 times more blood/body weight than man large heart for pumping capacity & myoglobin

Fig. 16.7, Feldhamer What is the ecological role of Cetaceans?

Food chain of the blue whale Phytoplankton & zooplankton Shrimp & other krill Whales consume 50 – 200 million tons/year = ?

Annual migration of humpback whales

Conservation and Biology of the Gray Whale Exploitation & Successful Conservation Physical Characteristics: m, tons, no dorsal fin, baleen - 40 cm, 5m at birth, weaned at 7 months & 8.5 m North Pacific ‑ Californian & Korean stocks Migration & Distribution Summer grounds (May ‑ Oct) Bearing or Chukcha Seas Winter grounds (Dec ‑ Feb) Baja California

Gray whale meters, tons 5 meters birth,

Summer feeding grounds

Reproductive Biology of Gray Whales Females with a 2 ‑ year cycle, breed in early Dec. with a gestation 13 months, birth in Baja (Jan ‑ Feb) Lactation by non ‑ feeding, migrating whales? Puberty at 5-10 years or 11 meters Estrus every year or every other year?

The End Cetacean Biology