“…Marine mammals can dramatically redistribute cardiac output during dives (Bron et al, 1966;Bryden and Molyneux, 1978;Elsner et al, 1966;Elsner and Gooden, 1983;Harrison et al, 1954;Harrison andTomlinson, 1956, 1963;Hol et al, 1975;Irving, 1969;Kooyman, 1985). Oxygen and temperature sensitive tissues, such as the central nervous system, maintain continuous blood flows during a deep dive, while other organs may be subjected to reduced blood flows, or temporary but complete blood flow cessation (Harrison et al, 1954;Irving, 1969;Irving et al, 1942;Ridgway, 1960, 1983;Kanwisher and Sundes, 1965;Kooyman, 1972Kooyman, , 1985Scholander et al, 1942;Kooy-man et al, 1981;Zapol et al, 1979). Seals thus may experience episodic decreases in blood flow to their splanchnic beds, for example blood flow rates to the splanchnic beds of non-pregnant Weddell seals (Leptonychotes weddelli) can be reduced by more than 90% during forced dives (Elsner et al, 1970;Zapol et al, 1979).…”