Tenaya Norris, the Marine Mammal Center

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Recent Anomalies in Pinniped Stranding Trends Along the Central California Coast Tenaya Norris, Shawn Johnson, Frances Gulland The Marine Mammal Center Fort Bragg Operations Anchor Bay Operations Sausalito Headquarters and Hospital Monterey Bay Operations San Luis Obispo Operations SANTA BARBARA Annual Number of Stranded Pinnipeds Pacific harbor seal Northern elephant seal California sea lion 2014 2015 Mendocino-San Luis Obispo 802 804 + Santa Barbara 968 1146 Guadalupe fur Northern fur Steller sea lion seal seal California Sea Lion (CSL) Sep to May ~300,000 Year-round CSL Annual Cycle Adult Females Lactation (11 months) Birth Breed Gestation (9 months) J J A S O N D J F M A M Pups Early Peak Dependent (6 months) weaning weaning CSL Primary Causes of Stranding • Green shading: Malnutrition/failure to find enough food • Blue shading: Infectious disease/biotoxicosis/etc. Monthly CSL Strandings, age 0-2 years 16 ± 3% 55 ± 4% 29 ± 4% 59% 48% Guadalupe Fur Seal Conclusions • Increased number of stranded pinnipeds on California beaches in 2014 and Spring 2015 – Similar to previous years with anomalously warm waters in California Current System • CSL < 2 yrs old particularly vulnerable • Recent shift in peak CSL strandings (age 0-2 yrs) from summer to spring – Lactating females unable to adequately provision pups • May indicate greater depletion of/changes to fish stocks than previous years with persistent, large-scale oceanographic anomalies • Record number of Guadalupe fur seal strandings in 2015 – Expected to do slightly better with warm waters • Really bad out there Marine Mammal Health Monitoring and Analysis Platform (MMHMAP) • Marine mammals – Integral component of marine ecosystems – Sentinel species for ocean and human health – Generate considerable public interest • But marine mammal health and stranding data currently not readily accessible or integrated with oceanographic data • Idea is to collate marine mammal data into a database – Compatible for integration with environmental datasets – Accessible by the public, managers, scientists within the Integrated Ocean Observing System (IOOS) Marine Mammal Health Monitoring and Analysis Platform (MMHMAP) http://data.cencoos.org/staging.php?v=rand&cs=heat&portal_id=20#map?lg=a4b0bec0-b9be-11e3-835f-00219bfe5678&p=proj3857&b=google_hybrid Adult Female CSL Movements 2-4 days at sea 1-2 days nursing 5-75 m primary diving (dive as deep as 600 m when need to) 45% 45% 5%.

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