May 152018
 


Kayangel Atoll is set to become the first inhabited island in the Pacific nation of Palau to be cleared of rats. As well as a healthier ecosystem for fascinating Endangered birds, residents look forward to better livelihoods through increased crop yields.

The Micronesian Scrubfowl Megapodius laperouse is a genius at inventing ways to keep its eggs warm. Those on the Northern Mariana Islands burrow into volcanic cinder fields or use the geothermal heat beneath the ground to warm their unhatched young.

Across the Palau archipelago, they bury their eggs in large mounds of sun-soaked sand in beachside forests. Ingeniously, they incorporate the warmth of rotting vegetation into the construction, adding more to the pile to increase the heat of the nest, or removing it if it becomes too hot.

The Micronesian Scrubfowl incubates its eggs using volcanic heat © Island Conservation

And that’s not the only remarkable thing about their upbringing, because Micronesian Scrubfowl chicks are super-precocial – meaning they hatch in a more mature condition than almost any other bird species. They emerge as fully-feathered miniature adults, ready to run, pursue prey and, almost uniquely among birds, can even fly on their first day of hatching.

But sadly, it seems they have been no match for rats. Invasive rats have been attacking bird nests and, without the timely intervention of a new project*, the Micronesian Scrubfowl’s extraordinary natural behaviours could have been lost forever. The species is currently classed as Endangered – and these birds aren’t the only ones feeling the devastation.

It started with a shipwreck

Kayangel Atoll in the Pacific Nation of Palau has been particularly hard hit by the rodent invasion. It all started with a shipwreck in the late 1980s. “Rats fleeing a sinking ship” is a well-known figure of speech, but in this case, it had very real repercussions. The rodents soon started to multiply. Kayangel’s 60 residents would go out to their fields to find their crops devoured or damaged before they could be harvested. For such a small island, with humans existing in a delicate balance with nature, this was particularly perturbing.

Rats invaded Kayangel Atoll, destroying crops and devouring local wildlife © Island Conservation

Ungilreng Takawo, Kayangel Island’s matriarch, explains the extent of the impact: “The presence of rats on the island caused many challenges for agriculture. The rats damaged our crops such as bananas, sweet potatoes, and corn. We welcome this project, and if successful, it will allow the local people to grow the crops they wish to grow.”

Heather Ketebengang from Palau Conservation Society (BirdLife Partner) said, “Palauanshave long shared the land and waters with native plants and wildlife. Invasive rats disrupted this natural balance. Hopes are high for the future of Kayangel.”

Laying the bait

The project in question took the form of a grueling two-month marathon over March and April this year, with the conservation team* spreading bait across 45 kilometres of trails, in order to target every single rat on the island. The Kayangel community played a vital role by removing alternative food sources for the rats, forcing them to take the bait. Residents are now waiting with baited breath for 2019’s survey, which will discover whether efforts have been successful.

Rats were successfully removed from three nearby islets. Today, they are teeming with wildlife

And there’s every likelihood they will be. A similar project in 2012 offered a glimpse of what Kayangel could soon become, when the Palau Conservation Society and BirdLife International successfully removed invasive rats from three nearby, uninhabited islets. Today, these islets are now teeming with wildlife.

Steve Cranwell, Pacific Programme Manager at BirdLife International, is confident in the project’s success: “Given this investment, we are optimistic that Kayangel will once again be rat free and will remain so, restoring harmony between the natural environment, livelihoods, and cultural identity on the island.”

Local people look forward to enriched livelihoods and cultural identity © Island Conservation

And it’s not just Scubfowl and people who will benefit from this timely intervention: the project contributes to the planet’s biodiversity as a whole. Kayangel is home to a wealth of fascinating species, many of them threatened with extinction. We hope that soon, the endemic Palau Flying Fox Pteropus pelewensis(Near Threatened) will swoop to greater heights, while the Hawksbill Turtle Eretmochelys imbricata (Critically Endangered) and Green Sea Turtle Chelonia mydas (Endangered) can nest on Kayangel’s rat-free beaches in safety.

Tommy Hall, Project Manager at Island Conservation, puts it in a nutshell: “It has been a privilege to work closely with the Kayangel community on this project. In the absence of invasive rats, native plants and animals will be able to naturally recover. We look forward to seeing the recovery of native species that have been struggling under the impacts of invasive rats. The Micronesian Scrubfowl will once again have a chance to thrive.”

Find out more about the beautiful Kayangel Atoll here (video © Palau Conservation Society)


The project was completed over March and April 2018 by a partnership consisting of the Kayangel community, Palau Conservation Society (BirdLife Partner), the Kayangel State Government, BirdLife International, and Island Conservation, with support from the Kayangel Protected Area Network State rangers and other Palauan states.

Funding for this work was provided by the U.S. Fish and Wildlife Service Coastal Conservation Fund, Island Conservation, T/Gear Trust, and BirdLife International.

 

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dogluvrgolden
I am extremely concerned about your article in today’s e-mail regarding the Incubator Bird population in the Pacific Islands. It states that bait is being used to “get rid of all the rats” and my concern, is whether this bait is poisonous, not only to the rats but to other wildlife, or is bait being used to trap and relocate the rats to a more suitable location ? If the entire population of rats is indeed being poisoned, this represents the devastation of the rat population in the area and also poses a severe risk and danger to the other… Read more »
Robert Piller

If it’s a toss up between an endangered native species and an import then the native wins every time!

M Leybra

But the good news is, the Hawksbill turtle will no longer be endangered once the rats on Palau atoll are all poisoned. “The Critically Endangered Hawksbill sea turtle is being hunted to extinction for its shell. Colored in hues of gold, amber, and brown, the animal’s striking shell is carved into jewelry, combs, guitar picks, and other trinkets & sold in markets across Latin America and the Caribbean. This demand for turtle shell products is driving the species towards extinction, conservationists say.”

M Leybra

Imagine that, not only have rats endangered Scrubfowl but “a wealth of fascinating species, many of them threatened with extinction.” The Palau Flying Fox, the Hawksbill Turtle the Green Sea Turtle’s eggs affecting ocean life as well as a myriad of Island endangered species. Even threatening human life, decimating banana crops, etc. And look who’s too happy to sell them poison bait, the U.S. via F&W Service. Who knows who all will be eating the poison or the poisoned rats? But article says it worked wonders on 3 other ‘uninhabited’ Islands. Will find out.

Craig

Murder, Speciesism, racism.

Sometimes nature, especially invasive species needs to be controlled.

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