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Description of Unusual Mortality Events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

 

Alaska

graph of marine mammal Unusual Mortality Events for the Alaska region from 1980-2020

Description of time series:

Trend analysis is not appropriate for Marine Mammal Unusual Mortality Event data.

 

Description of Unusual Mortality events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

 

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

Hawaii-Pacific Islands

graph of marine mammal Unusual Mortality Events for the Hawaii-Pacific Islands region from 1980-2020

Description of time series:

Trend analysis is not appropriate for Marine Mammal Unusual Mortality Event data.

 

Description of Unusual Mortality events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

 

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

California Current

graph of marine mammal Unusual Mortality Events for the Hawaii-Pacific Islands region from 1980-2020

Description of time series:

Trend analysis is not appropriate for Marine Mammal Unusual Mortality Event data.

 

Description of Unusual Mortality events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

 

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

Gulf of Mexico

graph of marine mammal Unusual Mortality Events for the Gulf of Mexico region from 1980-2020

Description of time series:

Trend analysis is not appropriate for Marine Mammal Unusual Mortality Event data.

 

Description of Unusual Mortality events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

 

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

Southeast

graph of marine mammal Unusual Mortality Events for the Southeast region from 1980-2020

Description of time series:

Trend analysis is not appropriate for Marine Mammal Unusual Mortality Event data.

 

Description of Unusual Mortality events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

 

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

Northeast

graph of marine mammal Unusual Mortality Events for the Northeast US region from 1980-2020

Description of time series:

Trend analysis is not appropriate for Marine Mammal Unusual Mortality Event data.

 

Description of Unusual Mortality events:

Marine mammals are important parts of marine ecosystems. Sometimes we observe significant die-offs in a marine mammal population - also called unusual mortality events (UMEs). A UME is defined as "a stranding that is unexpected; involves a significant die-off of any marine mammal population; and demands immediate response." UMEs are often caused by ecological factors (e.g. changes in ocean conditions or food sources), biotoxins, infectious disease, and human interactions, but in some cases the cause cannot be determined. Some unusual mortality events occur over a period of months and others last for years. Understanding and investigating marine mammal UMEs is crucial because they can be indicators of ocean health, giving insight into larger environmental issues, which may also have implications for human health. We present the number of unusual marine mammal mortality events in a given year in all the Alaska, Pacific Islands, California Current, Gulf of Mexico, Southeast, and Northeast regions.

 

Data:

Unusual mortality event (UME) data for marine mammals were accessed from the NOAA Fisheries Active and Closed Unusual Mortality Events website (https://www.fisheries.noaa.gov/national/marine-life-distress/active-and-closed-unusual-mortality-events). A value of 1 was assigned for each UME (open and closed) reported as occurring for any portion of a given year and the values were summed by year for each region. For UMEs where the date range was not indicated, a value of 1 was applied only for the year the UME was declared.

Resources

Active and Closed Unusual Mortality Events

Since 1991, marine mammal unusual mortality events (UMEs) have been declared.