000			03476cam a2200349 a 4500
001			2011052056
003			DLC
005			20190729105031.0
008			120120s2012 caua b s001 0 eng
010			_a 2011052056
020			_a9780520270572 (hardback)
040			_aDLC _cDLC _dDLC
042			_apcc
049			_aEY8Z
050	0	0	_aQL713.2 _b.B475 2012
082	0	0	_a599.5/138 _223
084			_aSCI070030 _2bisacsh
100	1		_aBerta, Annalisa.
245	1	0	_aReturn to the sea : _bthe life and evolutionary times of marine mammals / _cAnnalisa Berta ; illustrated by James L. Sumich and Carl Buell.
250			_a1st ed.
260			_aBerkeley, CA : _bUniversity of California Press, _c2012.
300			_axiii, 205 p. : _bill. ; _c24 cm.
520			_a"Return to the Sea portrays the life and evolutionary times of marine mammals--from giant whales and sea cows that originated 55 million years ago to the deep diving elephant seals and clam-eating walruses of modern times. This fascinating account of the origin of various marine mammal lineages, some extinct, others extant but threatened, is for the non-specialist. Set against a backdrop of geologic time, changing climates, and changing geography, evolution is the unifying principle that helps us to understand the present day diversity of marine mammals and their responses to environmental challenges. Annalisa Berta explains current controversies and explores patterns of change taking place today, such as shifting food webs and predator-prey relationships, habitat degradation, global warming, and the effects of humans on marine mammal communities"-- _cS ource other than Library of Congress.
520			_a"This book portrays the life and evolutionary times of marine mammals, from giant whales and sea cows that originated 55 million years ago and walked on land, to deep-diving elephant seals and clam-eating walruses of modern times. Some animals like the hippo-sized herbivorous desmostylians and aquatic sloths were evolutionary experiments that did not survive. This fascinating account of the origin of various marine mammal lineages written for the non-specialist is set against a backdrop of geologic time, changing climates, and geography. The thread of evolution runs through the book and helps us to understand the today's diversity of marine mammals and marine-mammal responses to environmental challenges. The story of the evolution of these fascinating animals, their lives and habits, offers a valuable perspective and in some cases lessons for the future. Berta also informs readers about current controversies in the field of marine mammalogy, presenting a balanced view based on careful evaluation and interpretation of the evidence. She explores patterns of change taking place today such as changing food webs and predator-prey relationships, habitat degradation, global warming, and the effects of humans on marine-mammal communities. The future of marine mammals depends on each of us, scientists as well as the informed public, working together to avoid crises before they develop or appropriately managing those that do arise"-- _cSource other than Library of Congress.
504			_aIncludes bibliographical references and index.
650		0	_aMarine mammals _xEvolution.
650		7	_aSCIENCE / Life Sciences / Zoology / Mammals. _2bisacsh
948			_au365878
949			_aQL713.2 .B475 2012 _wLC _c1 _hEY8Z _i33039001312197
596			_a1
903			_a24662
999			_c24662 _d24662