The State of California studies dead sea otters, like this one found by USGS scientists in Piedras Blancas, Calif., to learn about their causes of death and to understand the variety of environment stress factors that impact the nearshore marine environment.
Brian B Hatfield (Former Employee)
Science and Products
California Sea Otter Surveys and Research
California Sea Otter Stranding Network
Population Biology and Behavior of Sea Otters
Pacific Nearshore Project
Santa Cruz Field Station
Annual California Sea Otter Census-2018 Spring Census Summary
Summary of Stranded Southern Sea Otters, 1985-2018 (ver. 3.0, June 2021)
Annual California Sea Otter Census-1985-2014 Spring Census Summary
Annual California Sea Otter Census - 2017 Spring Census Summary
Annual California Sea Otter Census: 2016 Spring Census Summary
Annual California Sea Otter Census - 2015 Spring Census Summary
The State of California studies dead sea otters, like this one found by USGS scientists in Piedras Blancas, Calif., to learn about their causes of death and to understand the variety of environment stress factors that impact the nearshore marine environment.
Southern (California) sea otter population status and trends at San Nicolas Island, 2020–2023
An integrated population model for southern sea otters
Sea otter population collapse in southwest Alaska: Assessing ecological covariates, consequences, and causal factors
Sea otter (Enhydra lutris) populations in southwest Alaska declined substantially between about 1990 and the most recent set of surveys in 2015. Here we report changes in the distribution and abundance of sea otters, and covarying patterns in reproduction, mortality, body size and condition, diet and foraging behavior, food availability, health profiles, and exposure to environmental contaminants
Habitat features predict carrying capacity of a recovering marine carnivore
Southern (California) sea otter population status and trends at San Nicolas Island, 2017–2020
California sea otter (Enhydra lutris nereis) census results, spring 2019
Drift and beaching patterns of sea otter carcasses and car tire dummies
California sea otter (Enhydra lutris nereis) census results, spring 2018
California sea otter (Enhydra lutris nereis) census results, Spring 2017
California sea otter (Enhydra lutris nereis) census results, Spring 2016
Dramatic increase in sea otter mortality from white sharks in California
A multi-decade time series of kelp forest community structure at San Nicolas Island, California
Science and Products
California Sea Otter Surveys and Research
California Sea Otter Stranding Network
Population Biology and Behavior of Sea Otters
Pacific Nearshore Project
Santa Cruz Field Station
Annual California Sea Otter Census-2018 Spring Census Summary
Summary of Stranded Southern Sea Otters, 1985-2018 (ver. 3.0, June 2021)
Annual California Sea Otter Census-1985-2014 Spring Census Summary
Annual California Sea Otter Census - 2017 Spring Census Summary
Annual California Sea Otter Census: 2016 Spring Census Summary
Annual California Sea Otter Census - 2015 Spring Census Summary
The State of California studies dead sea otters, like this one found by USGS scientists in Piedras Blancas, Calif., to learn about their causes of death and to understand the variety of environment stress factors that impact the nearshore marine environment.
The State of California studies dead sea otters, like this one found by USGS scientists in Piedras Blancas, Calif., to learn about their causes of death and to understand the variety of environment stress factors that impact the nearshore marine environment.
Southern (California) sea otter population status and trends at San Nicolas Island, 2020–2023
An integrated population model for southern sea otters
Sea otter population collapse in southwest Alaska: Assessing ecological covariates, consequences, and causal factors
Sea otter (Enhydra lutris) populations in southwest Alaska declined substantially between about 1990 and the most recent set of surveys in 2015. Here we report changes in the distribution and abundance of sea otters, and covarying patterns in reproduction, mortality, body size and condition, diet and foraging behavior, food availability, health profiles, and exposure to environmental contaminants