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Word Count: 341
When considering the great depths that many marine mammals are able to achieve on just one breath of air it is quite perplexing The fact is marine mammals such as the bottlenose dolphin can reach depths of 115m by implementing several different strategies while diving These strategies are covered in the article Sink or Swim Strategies for Cost-Efficient Diving by Marine Mammals The research focuses on the ability of the animals to complete these dives without having to convert to anaerobic respiration The research looked at several different animals 3 adult Weddell Seals a juvenile northern elephant seal an adult bottlenose dolphin and an adult blue whale The locomotor behavior used during these deep dives was what the researchers were interested in Each animal was fitted with a submersible video system The systems were oriented in one of two directions depending on what needed to be observed With the video system facing forward the researchers were able to record the movement of the animals head When oriented to the rear the system is able to monitor the movement of the flukes or hind flippers With the use of the video the researchers were able to note the swimming periods stroke frequency and gliding sequences In addition to this information the duration and depth of the dives were recorded In order to determine the implications of these movement patterns on energetic cost researchers measured the post dive oxygen consumption from Weddell Seals These figures were obtained by having the seals breath into a metabolic hood After reviewing the data collected the researchers found that despite their differences both the cetaceans the dolphin and whale and the pinnipeds the seals shared similar patterns of locomotor behavior during diving The scientist noticed that each dive began with a period of continuous stroking between 30 to 200 s This was followed by a period of sustained gliding which continued until the final depth was reached The seals and
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