Anatomy and morphology adaptation of sea mammals

Blažeković, Kristina (2010) Anatomy and morphology adaptation of sea mammals. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Sea mammals include two large and abundant groups, Cetacea (whales) and Pinnipedia (seals, sea lions and walruses), and one smaller group, Sirenia. Every group of sea mammals evolved from terrestrial ancestor and then came back to life in the water. They developed many adaptations to life in water, some to extremes. Cetaceans are very streamlined, breathe through a dorsal blowhole, and lack hair and rear legs or flippers. Even so, like all mammals they give birth to live young and maintain their own body temperature. For compensating reduced visibility and their inability to smell underwater, toothed whales have developed a sophisticated system of echolocation for target detection and orientation. They developed several drastic respiratory and circulatory adjustments to prolonged diving, including apneustic breathing, lung collapse, peripheral circulation shutdown, bradycardia and systemic storage of oxygen. For maintaining body temperature in such cold environment they adapted with shape and body size, they have blubber and some have rich fur and underfur (Pinnipedia). Sea mammals also adapted their reproduction to life in the water.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Ćaleta, Marko
Date: 2010
Number of Pages: 17
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 02 Dec 2014 10:08
Last Modified: 02 Dec 2014 10:08
URI: http://digre.pmf.unizg.hr/id/eprint/3409

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