Fishing ban rescues Robben Island penguin chicks

July 7, 2015
Endangered African penguins on Robben Island, South Africa, where former South African president, Nelson Mandela spent 18 of his 27 years in prison. Restrictions on commercial fishing in a 20 km radius around Robben Island led to improved penguin chick survival. Credit: © Davide Gaglio, davygaglio.wix.com/home

Survival of endangered African penguin chicks increased by 18% following a trial three-year fishery closure around Robben Island in South Africa, a new study from the University of Exeter has found.

The results, which are published in the Royal Society Journal Biology Letters, indicate that even small 'no-take zones' can dramatically improve the survival chances of .

The African penguin population is in freefall, with adult survival rates over the last decade desperately low. Although the ban on commercial fishing off Robben Island has boosted chick survival, the long term prospect for the species remains gloomy.

Dr Richard Sherley from the University of Exeter said: "One of the major challenges of conserving a mobile species like the African penguin is that once they leave a protected area they are subject to outside pressures and dangers, including poor prey availability.

"Our study shows that small no-take zones can aid the survival of African penguin chicks, but ultimately commercial fishing controls must be combined with other management action if we are to reverse the dramatic decline of this charismatic species".

African penguins feed on sardines and anchovies but fishing of these species off Cape Town is considered to have contributed to a 69% reduction in penguin numbers between 2001 and 2013.

The species' worsening conservation status led to experimental fishing closures around four colonies between 2008 and 2014. These were earlier found to reduce penguin foraging effort but a beneficial impact on demographic parameters had not been demonstrated before this study and so the benefits of the closures have been the subject of much debate.

Although this study has shown that the fishery closure around Robben Island has improved chick survival, if the current fishing pressure exerted on sardine in particular continues on the west coast there will still not be sufficient food to allow the penguin population to recover.

Seabirds will often respond to a scarcity of food by skipping or abandoning breeding, opting not to re-lay after losing clutches of eggs, or reducing the amount of food brought to the chicks leading to slow growth, poor chick condition and mortality through starvation. African have shown all of these responses in recent years.

1501 nests were monitored at Robben Island between 2001 and 2013 to determine chick survival rates and a hydro-acoustic survey was carried out to estimate sardine and anchovy biomass.

Bottom-up effects of a no-take zone on endangered penguin demographics by Richard Sherley, Henning Winker, Res Altwegg, Carl van der Lingen, Stephen Votier and Robert Crawford is published in the Royal Society journal Biology Letters.

Explore further: Rescued 'abandoned' penguin chicks survival similar to colony rates

More information: Bottom-up effects of a no-take zone on endangered penguin demographics, rsbl.royalsocietypublishing.org/lookup/doi/10.1098/rsbl.2015.0237

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4 comments

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gkam
1 / 5 (1) Jul 07, 2015
I hope our conservatives were okay with us taking away their "right" to kill those sardines, just so we could maintain the living environment which cleans our water, makes our Oxygen, and provides us with food.
24volts
not rated yet Jul 07, 2015
Why don't you ask the people that live there that might have depended on catching fish for their food and livelyhood. You might just get a different perspective.
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You can also quite insulting conservatives all the time as it's getting really damn old. There are a lot of us that happen to be conservative and also want recycling and alt power too. Nor are we adverse to science and nor are we all are ignorant or disbelieving of global climate change either!. I'm really tired of your same old insults all the time. GROW UP. This is a science site not your political playground!
gkam
not rated yet Jul 07, 2015
"You can also quite insulting conservatives all the time as it's getting really damn old. There are a lot of us that happen to be conservative and also want recycling and alt power too."
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Sorry. You are a rare one.

What happened to the rest? You are a real conservative, in the real sense, not what we have now, the fruits. I remember the days before liberal became a dirty word. So now, we are polarized.

But you are correct, and I will be more specific.
24volts
not rated yet Jul 08, 2015
Thank you.

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