24 October 2014

Rescued 'abandoned' penguin chicks' survival similar to colony rates

SOUTH AFRICA - Abandoned African penguin chicks that were hand-reared and returned to the wild showed a similar survival rate to their naturally-reared counterparts, according to a study published on 22 October 2014 in the open-access journal PLoS ONE by Richard Sherley from University of Cape Town and colleagues.

The endangered African penguin population has been rapidly decreasing since 2001. In the Western Cape of South Africa, penguins breed from February to September and moult between September and January, once chicks have fledged. If adult penguins begin the moulting process, a 21-day period where they no longer have the waterproofing necessary to dive for food, with chicks in the nest, the chicks may starve. 

Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) recovers 'abandoned' penguin chicks that are no longer being fed and cares for them until they can be reintroduced into breeding colonies. 

Researchers documented the care, release and survival of over 840 hand-reared chicks in 2006 and over 480 hand-reared chicks in 2007. Of those admitted, in 2006, 91% and, in 2007, 73% were released into the wild. Post-release juvenile and adult survival rates were similar to recent survival rates recorded for naturally-reared birds. 

By December 2012 researchers observed that 12 birds had bred; six at their colony of origin. The authors suggest that hand-rearing of 'abandoned' penguin chicks may be a useful conservation tool to limit mortality and to strengthen the population at specific colonies. 

"Over the last decade, food availability has decreased dramatically for penguins breeding in Western South Africa and many birds now struggle to rear their chicks before they need to initiate moult," said Dr. Sherley 

"Hand-reared chicks can sustain populations in the short-term and help us understand how we might create new breeding colonies in areas of higher food availability."

Source

PLoS ONE citation 
Sherley RB, Waller LJ, Strauss V, Geldenhuys D, Underhill LG, et al. (2014) Hand-rearing, release and survival of African penguin chicks abandoned before independence by moulting parents. PLoS ONE 9(10): e110794. doi:10.1371/journal.pone.0110794

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