Skip to main content

Be Double the Hero Today

Starving and too young to be separated from his mother, Ody was found alone. Just like many other patients at our hospital right now, this skinny pup was in no shape to make it on his own.

Today, your gift will be matched dollar-for-dollar. That means you can give double the meals and meds to help a patient like Ody return home for the holidays.

I want to be double the hero. Match my gift!
northern fur seal Ody
New Zealand sea lion

Causes of Death in Two Populations of New Zealand Sea Lions

Adult mortality in two populations of New Zealand sea lions (Phocarctos hookeri)
  • Infectious disease


The New Zealand sea lion is an endangered species endemic to New Zealand. While causes of death are well described for pups of this species, mortality in adults is poorly characterised. This study investigated causes of death in 136 New Zealand sea lions in two different populations: a major breeding site on remote, uninhabited Enderby Island in the sub-Antarctic, and a slowly increasing recolonising population on the inhabited mainland. For animals with at least a partial diagnostic investigation (n = 112), the most frequently diagnosed causes of mortality were infectious disease (41/112; 37%), particularly tuberculosis due to M. pinnipedii (20/112; 18%), and conspecific trauma (27/112; 24%). Anthropogenic trauma was an important cause of death in mainland sea lions (9/33; 26%). Deliberate anthropogenic mortality has previously been identified as the greatest potential threat to population recovery for mainland sea lions, and as human and pinniped populations increase, managing interactions between these species will become increasingly important. 

Lenting, B., Gartrell, B., Kokosinska, A., Duignan, P.J., Michael, S., Hunter, S., Roe, W.D. 2019. Causes of adult mortality in two populations of New Zealand sea lions (Phocarctos hookeri). Animal and Veterinary Science 7: 10057.

infectious disease
Pádraig Duignan

Meet The Experts

Related Publications

Recent News