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Author : Ethel I. Todd,Karl W. Kenyon
Publisher : Unknown
Page : 52 pages
File Size : 46,6 Mb
Release : 1972
Category : Sea otter
ISBN : UOM:39015077581034
Bibliography stressing recent literature dealing with biology of the sea otter (Enhydra lutris).
Author : Anonim
Publisher : Unknown
Page : 100 pages
File Size : 46,9 Mb
Release : 1981
Category : Marine mammals
ISBN : UVA:35007001082340
Author : Renn Tumlison
Publisher : Unknown
Page : 36 pages
File Size : 50,6 Mb
Release : 1985
Category : North American river otter
ISBN : WISC:89078247194
Author : Anonim
Publisher : Unknown
Page : 978 pages
File Size : 41,6 Mb
Release : 1972
Category : Government publications
ISBN : UOM:39015022681731
Author : Anonim
Publisher : Unknown
Page : 1388 pages
File Size : 51,9 Mb
Release : 2024-07-01
Category : Government publications
ISBN : WISC:89117116475
Author : United States. Superintendent of Documents
Publisher : Unknown
Page : 1408 pages
File Size : 40,7 Mb
Release : 1976
Category : United States
ISBN : STANFORD:36105021034173
Author : Anonim
Publisher : Unknown
Page : 58 pages
File Size : 40,9 Mb
Release : 1972
Category : Wildlife conservation
ISBN : UOM:39015023772026
Author : James L. Ruos
Publisher : Unknown
Page : 638 pages
File Size : 55,7 Mb
Release : 1971
Category : Bird populations
ISBN : UCSD:31822009785171
U.S. mourning dove population indexes increased by 4% from 1969 to 1970 in the Eastern Management Unit, but declined 2% in the Central Management Unit and 11% in the Western Management Unit. The changes were below the 10-year means, 1960-69, by 3% in the Eastern Unit, 15% in the Central, and 27% in the Western. Regression analyses of the call-count data for 1960-70 indicate a statistically significant downward trend in dove breeding populations in all management units; mean rates of decline were 1% a year in the Eastern Unit, 3% a year in the Central, and 4% in the Western
Author : Todd McLeish
Publisher : Sasquatch Books
Page : 272 pages
File Size : 54,9 Mb
Release : 2018-03-20
Category : Nature
ISBN : 9781632171382
A science journalist's journey along the Pacific Coast from California to Alaska to track the status, health, habits, personality, and viability of sea otters--the appealing species unique to this coastline that was hunted to near extinction in the 18th and 19th centuries. These adorable, furry marine mammals--often seen floating on their backs holding hands--reveal the health of the coastal ecosystem along the Pacific Ocean. Once hunted for their prized fur during the 1700s and 1800s, these animals nearly went extinct. Only now, nearly a century after hunting ceased, are populations showing stable growth in some places. Sea otters are a keystone species in coastal areas, feeding on sea urchins, clams, crab, and other crustaceans. When they are present, kelp beds are thick and healthy, providing homes for an array of sealife. When otters disappear, sea urchins take over, and the kelp disappears along with all of the creatures that live in the beds. Now, thanks to their protected status, sea otters are making a comeback in California, Washington, and Alaska.
Author : Patricia Newman
Publisher : Millbrook Press
Page : 56 pages
File Size : 43,8 Mb
Release : 2019-01-01
Category : Juvenile Nonfiction
ISBN : 9781541554535
Audisee® eBooks with Audio combine professional narration and sentence highlighting for an engaging read aloud experience! A Robert F. Sibert Informational Honor Book A Green Earth Book Award Winner This up-close look at a fascinating scientific discovery highlights the critical role predators such as sea otters play in keeping ecosystems healthy. In Elkhorn Slough, an inlet on the California coast, seagrass grows healthy and strong in the shallow water. This healthy seagrass baffled marine biologist Brent Hughes. The scientist expected this estuary to be overrun with algae, causing the seagrass to die. Why was the seagrass thriving? As Brent investigated, signs pointed to an unexpected player helping to keep the seagrass healthy: sea otters! What do these top predators have to do with an aquatic grass at the opposite end of the food chain? Brent's amazing discovery gave scientists insight into the delicate balance of ecosystems. Follow science in action as Brent conducts the research that led to this major discovery.
Author : Anonim
Publisher : Unknown
Page : 282 pages
File Size : 42,8 Mb
Release : 1974
Category : Government publications
ISBN : UCAL:B4460988
Author : Anonim
Publisher : Unknown
Page : 424 pages
File Size : 54,5 Mb
Release : 1987
Category : Wildlife conservation
ISBN : UCSD:31822023221542
Author : Dean Littlepage
Publisher : The Mountaineers Books
Page : 378 pages
File Size : 45,9 Mb
Release : 2006
Category : Biography & Autobiography
ISBN : 1594850577
History, adventure, and science-the 18th century naturalist, Georg Steller, sailed to the north coast of North America and introduced its biological wonders to the world.
Author : Environmental Science Information Center. Library and Information Services Division
Publisher : Unknown
Page : 582 pages
File Size : 42,9 Mb
Release : 1977
Category : Electronic
ISBN : IND:30000105034924
Author : Environmental Science Information Center. Library and Information Services Division
Publisher : Unknown
Page : 578 pages
File Size : 47,6 Mb
Release : 1977
Category : Earth sciences
ISBN : UOM:39015007489944