Sea lion strandings: The view from the rookery

Sea lion strandings -- The view from the rookery
Sea lion pups at San Miguel Island in July, 2014. The month-old pups in this photo would endure nearly a year of hunger, and many would ultimately strand on the California coast. Credit: Paul Hillman/NOAA

For a few months now, sea lion pups have been stranding on the coast of Southern California. So many have washed up, emaciated and exhausted, that marine mammal care centers can scarcely hold them all. But while most people first notice the pups on the beach, their desperate plight began on the Channel Islands, which are about 25 miles offshore of Santa Barbara. Those islands are home to the sea lion rookeries where the pups are born and where they spend the first year of life.

Many pups at the rookeries are going hungry, according to Sharon Melin, a wildlife biologist with the NOAA Fisheries National Marine Mammal Laboratory who recently returned from 3 weeks of fieldwork on the Channel Islands.

In this podcast, Melin explains that unusually warm water along the Pacific coast has sent sardines, anchovies, and other north or deeper in search of cooler water. As a result, sea lion mothers are having trouble finding enough food to nurse their pups.

Many of the pups eventually set off on their own desperate search for food. But the pups, weak and lacking the experience they need to forage on their own, wash up on the mainland instead.

Sea lion strandings -- The view from the rookery
NOAA Fisheries scientist Sharon Melin looks on as her colleague weighs a sea lion pup using a spring scale, at the Sea Lion rookery on San Miguel Island. Credit: Jeff Harris/NOAA
In this podcast, NOAA Fisheries wildlife biologist Sharon Melin describes conditions at the sea lion rookeries on the Channel Islands, where pups are going hungry because unusually warm water along the Pacific coast has made it more difficult for their mothers to find food. Credit: NOAA Fisheries

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Citation: Sea lion strandings: The view from the rookery (2015, May 6) retrieved 17 August 2019 from https://phys.org/news/2015-05-sea-lion-strandings-view-rookery.html
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