browser may not display or print as intended. Fish and Wildlife Service’s delisting threshold for a second straight year. Hatfield, B.B., Yee, J.L., Kenner, M.C., and Tomoleoni, J.A., 2019, California sea otter (Enhydra lutris nereis) census results, spring 2019: U.S. Geological Survey Data Series 1118, 12 p., https://doi.org/10.3133/ds1118. Geological Survey3020 State University Drive EastSacramento, California 95819. ... 1994 Data Value (pixels) 2010 Data Value (pixels) 1994-2010 Change (pixels) % Fish and Wildlife Service, and contributes to our understanding of sea otters and nearshore ecosystem health from California to Alaska. Hughes overlaid the captain’s sea otter counts with historical seagrass coverage data and realised the two graphs were almost perfectly in sync. Main resight area in the current Cambria sub-population.....50 Figure 16. California Sea Otter (Enhydra lutris nereis) Census Results, Spring 2019 By Brian B. Hatfield, Julie L. Yee, Michael C. Kenner, and Joseph A. Tomoleoni Abstract The 2019 census of southern sea otters (Enhydra lutris nereis), also known as California sea otters, was conducted from early May to early July along the mainland coast of This graph shows the southern sea otter population trend since 1985, based on the annual data collected by the U.S. Geological Survey. The information gathered will be used by federal and state wildlife agencies in making decisions about the management of this sea mammal. OSTI.GOV Technical Report: Population status of California sea otters. For southern sea otters to be considered for removal from threatened species listing, the population index would have to exceed 3,090 for three consecutive years, according to the threshold established under the Southern Sea Otter Recovery Plan by the U.S. California’s southern sea otter has been listed as a threatened species under the Endangered Species Act since 1977. Sea otters play a vital role in the health and stability of the nearshore marine ecosystem as a keystone species The spring 2019 mainland sea otter count began on May 1 and was completed by July 9. 1). Director, Western Ecological Research CenterU.S. How do sea otters impact near-shore marine food webs? Below are news stories associated with this project. Sea Otter Facts. By 1976 the population contained an estimated 1,789 individuals, but then declined to 1,443 by 1979 and to 1,372 by 1984. Although the California sea otter population is declining, the geographic range of the population continues to expand both to the north and south. Official websites use .gov Yet despite an overall increase in sea otter abundance, sharks have been “taking a bite” out of the portion of the population that could fuel expansion into new areas. SANTA CRUZ, Calif. — The southern sea otter population continues its pattern of tepid recovery, according to the latest population survey led by U.S. Geological Survey, California Department of Fish and Game Office of Spill Prevention and Response and Monterey Bay Aquarium scientists. Since 1982, a standardized method has been deployed to survey the sea otter population in California. In fact, a new study released today concludes that California could more than triple its population of southern sea otters, from an estimated 3,000 to nearly 10,000, by repopulating the largest estuary on the coast—the San Francisco Bay. 19. United States. Southern sea otters, also called California sea otters, live in waters along the California coastline, ranging from San Mateo County in the north to Santa Barbara County in the south. Interns & Volunteers. WERC's sea otter team works with multiple institutions and partners to report, recover, and examine stranded sea otters. California sea otters (5.0%; Riedman and Estes 1990), and reoccupied the full extent of their historical ranges. Fish and Wildlife Service. What clues does the sea otter's decline hold for our knowledge of ecosystem and global change? ... in otter numbers. An official website of the United States government. The spring surveys have traditionally been used to assess population status because they are both consistently higher … This population index is what is reported to the U.S. Two-person teams use binoculars and spotting scopes to count individuals (Public domain.). A standardized method to survey sea otters was developed by WERC scientists and put into use in 1982 in California. No single year's survey result is indicative of a population change, however. Browse the menu, click on the "Data and tools" tab, "News" tab, and "Related" tab to learn about sea otter biology and the annual California sea otter population survey. The survey records the total otter numbers, the number of dependent pups, and the number of independents (adults and subadults), observed. Background: The California sea otter population, listed as threatened under the Endangered Species Act, has shown a slow and intermittent rate of recovery over recent years. SANTA CRUZ, Calif.— Southern sea otter numbers have declined off the coast of California since their most recent high in 2016. Once hunted to the brink of extinction for their luxuriant pelts, California sea otters rebounded after protections were put in place in 1911. 1118, Explore recent publications by USGS authors, Browse all of Pubs Warehouse by publication type and year, Descriptions of US Geological Survey Report Series. LockA locked padlock A separate ground-based survey of the sea otter population at San Nicolas Island was completed earlier (April 15–18). NO. 3020 State University Drive East Sacramento, California 95819 The southern sea otter (Enhydra lutris nereis) population at San Nicolas Island, California, has been monitored annually since the translocation of 140 sea otters to the island was completed in 1990. In coordination with the California Department of Fish and Game and other institutions, ongoing surveys and research continues to inform the southern sea otter recovery plan for the U.S. Data Series WERC scientists conducting long-term research in California and Alaska seek to answer complex ecological questions. Share sensitive information only on official, secure websites. The main objective of the study was to develop a simulation model to facilitate analysis of the risk of oil spills to the threatened California sea otter population. Fish and Wildlife Service, 2003) recommends using the 3-year running average of total counts as the official metric for monitoring trends, thereby reducing the influence of anomalously high Download annual survey data from 1985 to present. Currently the southern sea otter population is estimated at just above 3,000 animals. The aerial counts are entered directly into a geographic information system-linked database in the aircraft. The surveys, conducted cooperatively by scientists of the U.S. Geological Survey, California Department of Fish and Wildlife, U.S. Facts about California Sea Otters. California’s Sea Otter Numbers Continue Slow Climb. No data point selected. Santa Cruz, Calif. – After a decade of steady recovery, the southern sea otter — a federally listed threatened species — is in decline for the second year in a row, according to the latest population survey by U.S. Geological Survey researchers. Sea otter research by scientists at the Santa Cruz Field Station of the USGS Western Ecological Research Center (WERC) focuses on this smallest marine mammal’s population biology and its role as a keystone species in the nearshore marine community. WERC's sea otter researchers are developing and utilizing a variety of methodological and analytical tools to understand the causes of biological and ecological trends in sea otter populations, and to predict the ecological consequences of management practices on these populations and their ecosystems. Sea otters are crucial indicators of the health of our nearshore waters and coastal resources, from kelp forests to fisheries. Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data, Western Ecological Research Center (WERC), Download Annual Survey Data from 1985 - present (ScienceBase), Population Biology and Behavior of Sea Otters, Annual Southern Sea Otter Survey: Despite Small Population Dip, Species Moves a Step Closer to Recovery, Sea Otter Survey Encouraging, but Comes Up Short of the “Perfect Story”, Numbers Encouraging, but Shark Bites Still Problematic for Sea Otter Recovery, Slowly Swimming Towards Recovery, California’s Sea Otter Numbers Holding Steady, Recovery Slows for California’s Sea Otters, 2012 Survey Shows, Weather Conditions Prevent California Sea Otter Annual Population Survey, California Sea Otters: Population Recovery Continues at Slower Rate. In addition, instructions on how to report a stranded sea otter are included in this webpage... CALIFORNIA SEA OTTER POPULATION ANNUAL SURVEY DATA (data on ScienceBase). The California Sea Otter Stranding Network is part of the USGS effort to monitor southern sea otters (Enhydra lutris nereis) and provide data to the U.S. What are the consequences of the rapid sea otter decline in the Aleutian Islands? Why is California’s threatened sea otter population growing so slowly? Historically there were about 16,000 southern sea otters, commonly known as California sea otters, that lived from Oregon to Baja, Mexico. Full Record; Other Related Research Data from 1982 onward are counts made during annual spring surveys.Earlier data from counts and estimates using a variety of methods. Overall viewing conditions this year were very good, better than those encountered during the 2018 spring census (View Score = 3.0 this year compared to 2.4 last year, where 0=poor, 1=fair, 2=good, 3=very good, and 4=excellent). Likewise, California’s sea otter numbers are holding steady against the many forces pushing against their population recovery, according to the latest field survey led by federal, state, aquarium, and university scientists. Factors that can influence the count include viewing conditions, abundance and species composition of surface canopy kelp, observer experience, and distribution and movements of the animals. NOTICE: In light of the ongoing COVID-19 pandemic, the USGS and partners at the California Department of Fish and Wildlife, Monterey Bay Aquarium, and the U.S. California Sea Otter Census Results 3 California Sea Otter Census Results Range-Wide Summary The Southern Sea Otter Recovery Plan (U.S. SANTA CRUZ, California — The southern sea otter, Enhydra lutris nereis, continues its climb toward recovery, according to the annual count released today by the U.S. Geological Survey and partners. Population status of California sea otters. WERC's sea otter team and U.S. and Canadian researchers have teamed together to investigate. Population Data Sources California Sea Otter Population By: Danny Hamilton. The southern sea otter of California, a threatened population on the Endangered Species list, continues to recover, but the rate of recovery appears to have slowed. During the California Sea Otter Translocation Program Methodology Conclusions & Discussion ... contributed to the unsuccessful recovery efforts of the translocated population. ) or https:// means you’ve safely connected to the .gov website. A CDFW scientist using a telescope to search for sea otters. The 1914 data point is uncertain al- Existing data on the dynamics and demography of the population were synthesized. A lock ( Note: The Spring Survey 3–year running average is the metric the U.S. PDF documents opened from your In addition, the sea otter population size, density, and trajectory are all much greater in Alaska relative to California. 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