scholarly journals Southern (California) sea otter population status and trends at San Nicolas Island, 2017–2020

2020 ◽  
Author(s):  
Julie L. Yee ◽  
Joseph A. Tomoleoni ◽  
Michael C. Kenner ◽  
Jessica Fujii ◽  
Gena B. Bentall ◽  
...  
Keyword(s):  
Southern California ◽  
Sea Otter ◽  
Population Status ◽  
San Nicolas Island ◽  
Status And Trends

Activity and Prey Election in the Sea Otter: Influence of Population Status on Community Structure

1982 ◽  
Vol 120 (2) ◽  
pp. 242-258 ◽  
Author(s):  
James A. Estes ◽  
Ronald J. Jameson ◽  
Elaine B. Rhode
Keyword(s):  
Community Structure ◽  
Sea Otter ◽  
Population Status

scholarly journals Kelp Forests versus Urchin Barrens: Alternate Stable States and Their Effect on Sea Otter Prey Quality in the Aleutian Islands

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Nathan L. Stewart ◽  
Brenda Konar
Keyword(s):  
Energy Density ◽  
Potential Energy ◽  
Population Decline ◽  
Kelp Forest ◽  
Kelp Forests ◽  
Sea Otter ◽  
Population Status ◽  
Stable States ◽  
Alternate Stable States ◽  
Prey Quality

Macroalgal and urchin barren communities are alternately stable and persist in the Aleutians due to sea otter presence and absence. In the early 1990s a rapid otter population decline released urchins from predation and caused a shift to the urchin-dominated state. Despite increases in urchin abundance, otter numbers continued to decline. Although debated, prey quality changes have been implicated in current otter population status. This study examined otter prey abundance, size, biomass, and potential energy density in remnant kelp forest and urchin-dominated communities to determine if alternate stable states affect prey quality. Findings suggest that although urchin barrens provide more abundant urchin prey, individual urchins are smaller and provide lower biomass and potential energy density compared to kelp forests. Shifts to urchin barrens do affect prey quality but changes are likely compensated by increased prey densities and are insufficient in explaining current otter population status in the Aleutians.

Archaeological Resources of San Nicolas Island, California

1953 ◽  
Vol 19 (2) ◽  
pp. 109-125 ◽  
Author(s):  
Clement W. Meighan ◽  
Hal Eberhart
Keyword(s):  
Los Angeles ◽  
Volcanic Activity ◽  
Southern California ◽  
Small Island ◽  
Channel Islands ◽  
San Nicolas Island ◽  
Nearest Point

San Nicolas is a small island located off the coast of southern California some 75 miles southwest of Los Angeles and 55 miles from the nearest point of the mainland. It is the most distant from the mainland of eight islands referred to collectively as the Channel Islands. San Nicolas is about 8 miles long by 4 miles wide and is 32.2 square miles in area. According to Norris (n.d., pp. 67-74), San Nicolas Island is a faulted asymmetric anticline composed of Pleistocene sediments lying unconformably on Eocene sandstone and shale. Original deposition during the Eocene was followed by anticline development and faulting in Eocene-Oligocene times. Miocene volcanic activity probably accounts for the several small diabase dikes on the island and for rhyolitic Begg Rock 7 miles northwest. The Pleistocene sediments were laid down during the first half of that period when the island was nearly or entirely submerged.

Population Status and Trends

2009 ◽  
pp. 918-920 ◽  
Author(s):  
Jay Barlow ◽  
Randall R. Reeves
Keyword(s):  
Population Status ◽  
Status And Trends

Sea Otter Hunting and Conservation in Southern California since the Gold Rush

2019 ◽  
Vol 101 (3) ◽  
pp. 265-284
Author(s):  
Richard Ravalli ◽  
Michael C. McGrann
Keyword(s):  
Progressive Era ◽  
Southern California ◽  
Gold Rush ◽  
Sea Otter ◽  
Historical Sources ◽  
California Coast ◽  
Hunting Activity ◽  
Late Twentieth ◽  
Late Nineteenth ◽  
Late Twentieth Century

The sea otter population along the Southern California coast was reduced by maritime hunting in the late nineteenth and early twentieth centuries but not entirely driven to extinction. Based on historical sources and archival newspaper accounts, the authors have devised a conservative estimate of otter hunting activity between 1855 and 1908 and determined where hunting was concentrated. Conservation efforts in the Progressive Era and the 1970s and a translocation program in the late twentieth century have resulted in a limited population resurgence.

Population status and trends of Southern Giant Petrels (Macronectes giganteus) breeding in North Patagonia, Argentina

Polar Biology ◽  
2006 ◽  
Vol 30 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Flavio Quintana ◽  
Gabriel Punta ◽  
Sofía Copello ◽  
Pablo Yorio
Keyword(s):  
Population Status ◽  
North Patagonia ◽  
Status And Trends
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